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  • Chemistry  (3,915)
  • 1970-1974
  • 1950-1954  (3,915)
  • 1935-1939
  • 1954  (2,016)
  • 1951  (1,899)
Collection
Publisher
Years
  • 1970-1974
  • 1950-1954  (3,915)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 289-296 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vorversuche mit den reinen Pentoxyden Nb2O5 und Ta2O5 lieferten die bereit von BRAUER gefundenen Modifikationen T—Nb2O5, M—Nb2O5, H—Nb2O5 und T—Ta2O5 Außerdem ergab sich, daß Ta2O5 aus dem Schmelzfluß in einer weiteren  -  vermutlich in der von LAGERGREN und MAGNÉLI schon beobachteten  -  Modifikation kristallisiert.Die Pentoxyde Nb2O5 und Ta2O5 sind im festen Zustand miteinander mischbar. Die tantalreiche Mischphase besitzt das T-Gitter; die niobreiche Mischphase liegt in der MH-Form vor. Die Grenzzusammensetzung, bei der die T—MH-Umwandlung eintritt wurde für 900, 1050 und 1200°C bei 84, 67 und 61 Mol-% Nb2O5 gefunden. Ein heterogenes Gebiet, in dem beide Phasen nebeneinander vorliegen, kann nur klein sein. Die T—MH-Umwandlung ist bei entsprechender Variation der Zusammensetzung der Pentoxydphase reversibel durchführbar. Die Existenz einer instabilen, tantalreichen MH-Phase wurde nachgewiesen. Zwischen den Phasen T—Nb2O5, T—Ta2O5, MH—Nb2O und MH—Ta2O5 besteht Isodimorphie.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 301-319 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nach umfangreichen Untersuchungen über die Reproduzierbarkeit von Metallpotentialen gegenüber fremdionigen(2) Lösungen und die zu deren Erzielung erforderlichen Voraussetzungen wurden die Potentiale von Pt, Ag, Au, Hg, Cu und Graphit gegenüber wäßrigen Lösungen von HClO4 bzw. NaOH verschiedener Konzentrationen gemessen. Die Ergebnisse werden durch eine Potentialtheorie gedeutet, die als Primärvorgang die Adsorption von Lösungsmittelmolekeln an der Elektrodenoberfläche zugrunde legt, die dann weitere potentialbildende Sekundärvorgänge auslösen kann. Bei Vorliegen mehrerer potentialbildender Systeme entscheidet die Potentialstabilität über die Potentialbestimmung.
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  • 4
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 5
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 327-330 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydroxylamin wird durch Kaliumnitrosodisulfonat unter Bildung von Distickstoffmonoxyd, Kaliumhydroxylamindisulfonat und Wasser glatt dehydriert.Kaliumhydroxylamindisulfonat läßt sich bromatometrisch bequem und genau bestimmen.
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  • 6
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 1-20 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch thermische Spaltung von Germaniumtetrachlorid im Abschreckrohr gelang es, ein Germaniummonochlorid der Formel (GeCl)x darzustellen. Sein Existenzbereich wurde ermittelt. Thermische Zersetzung dieses Monochlorids führt je nach Art der Reaktionsbedingungen neben Germaniumtetrachlorid zu kristallinem Germaniumdichlorid, höheren Germaniumchloriden und metallischem Germanium.  -  Es konnte ein Digermaniumhexachlorid der Formel Ge2Cl6 dargestellt werden.
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  • 7
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 297-300 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die vorläufigen Strukturuntersuchungsergebnisse der von uns aufgefundenen 2. Modifikation des Claudetits mitgeteilt. Der Claudetit II kristallisiert in den Raumgruppen C2(2) oder Cs(2). Die Gitterabmessungen sind: a1 = 7,99 Å; a2 = 4,57 Å; a3 = 9,11 Å; α2 = 78°19′; Z = 4 Formeleinheiten As2O3; ϱr = 4,02 g/cm3. An Hand von PATTERSON-, gemischten PATTERSON- und Fourier-Synthesen kann gezeigt werden, daß die Verknüpfung der Atome in beiden Claudetitmodifikationen ähnlich ist.
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  • 8
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 320-326 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden Darstellungsmethode und Eigenschaften der Selenide und Telluride des Urans untersucht. USe (a = 5,739 kX) und UTe (a = 6,151 kX) besitzen NaCl-Struktur.Die Möglichkeit von Bildung von festen Lösungen der Uranmonochalkogenide mit Uranmonoverbindungen der Elemente der V. Gruppe wurde untersucht; die Gitterkonstanten der Mischkristallreihen U(As, Se) und U(Sb, Te) wurden festgestellt.U3Te4 ist kubisch, (Th3P4-Typ a0 = 9,378 kX), UTe2 tetragonal (a = 3,998 kX, c/a = 1,865), UOSe tetragonal (PbFCl-Typ, a = 3,893 kX, c/a = 1,789). Einige Synthesen des UOSe werden beschrieben.
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  • 9
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 331-337 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden Versuche zur Ermittlung der Konstitution des gelben Komplexes durchgeführt, der beim Zusammengießen von sauren Titansalzlösungen mit Wasserstoffperoxyd entsteht. Die Konzentration der TiO2--Ionen betrug stets 0,0005 Mole/1, die der Säure variierte von 0,1 bis 1,0 Mole/l. Das Molverhältnis [H2O2]/[TiO2+] wurde zwischen 0,1 und 8,0 geändert. Es wurden Extinktionsmessungen in verd. H2SO4, HCl, HNO3 und HClO4 ausgeführt und gefunden, daß Anionen an dem Aufbau des Komplexes in Lösung nicht beteiligt sind. Der Komplex ist positiv geladen, sein molarer Extinktionskoeffizient ist 594 für Licht von der Wellenlänge 436 mμ, die Komplexdissoziationskonstante wurde zu 5,4 · 10-5 bestimmt.
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  • 10
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 338-348 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umsetzung zwischen SO3 und NH3 in nichtwäßrigem und in wäßrigem Medium wurde studiert. Es zeigte sich, daß der primäre Schritt der Reaktion nicht die Bildung der Amidosulfonsäure sein kann. Primär entsteht vielmehr Sulfimid, O2SNH. Sulfimid polymerisiert sich leicht zu einem Trimeren, einem Tetrameren oder einem kettenförmig gebauten höheren Polymeren; letzteres reagiert mit SO3 und H2SO4 zu Polysulfimidsulfonsäuren. Die Hydrolyse dieser Sulfonsäuren führt zu den gleichen Produkten, die man direkt bei der Reaktion von SO3 und NH3 in wäßriger Lösung erhält.
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  • 11
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 59-64 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden Elektrolytchrom-Präparate hergestellt. Von den in der Achatmühle gemahlenen Präparaten wurden die Suszeptibilitäten nach Gouy bestimmt. Die achatpulverkorrigierten Suszeptibilitäten, gegen den Oxydgehalt der Präparate aufgetragen, liegen auf einer Geraden. Die Extrapolation auf den Oxydgehalt Null ergibt den Wert \documentclass{article}\pagestyle{empty}\begin{document}$$ \chi _\infty = + 2,65 \cdot 10^{ - 6}\; {\rm bzw}{\rm .}\chi _{{\rm Atom}} = + 138 \cdot 10^{ - 8} $$\end{document}.
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  • 12
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 21-31 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die bei der Einwirkung von wäßrigem KF auf MoO3 und WO3 entstehenden Bodenkörper isoliert und untersucht. Im System MoO3—KF—H2O konnte die Existenz von fünf verschiedenen Verbindungen nachgewiesen werden: K3MoO3F3 (I), K2MoO3F2 · H2O (II), K3Mo4O13F · 3 H2O (III), K2MoO2F4 · H2O (IV) und K2Mo4O13 (V). Die durch Entwässern von (III) erhaltene Verbindung K3Mo4O13F ist instabil und nicht mit der im System K2Mo4O13/KF vorkommenden inkongruent schmelzenden Verbindung K3Mo4O13F identisch. (II) läßt sich entwässern; die wasserfreie Verbindung K2MoO3F2 ist instabil und zerfällt beim Schmelzen in (I) und MoO3. Im System WO3—KF—H2O konnte die Existenz nur einer Verbindung K2WO3F2 · H2O nachgewiesen werden.
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  • 13
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 235-235 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 14
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 234-234 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 15
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 241-243 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Evans-cells in different aeration with oxygenAs it is difficult to adjust in a reproducible manner the current density in oxygen concentration cells  -  this also applies to other concentration cells of an electrone-receiver type  -  those test conditions have been closely examined which must be kept constant in order to enable a reproducible work.Though the quantity of oxygen dissolved in the electrolyte is in all degrees of aeration equally high, the current density varied very much. It was found that the cause of this fact is a stirring effect caused by the aeration. In the moved electrolyte more oxygen reacts electrothemically at the cathode than in the static electrolyte.
    Notes: Da die Stromdichte in Sauerstoffkonzentrationselementen (das gilt auch für andere Elektronennehmer-Konzentrationselemente) schwer reproduzierbar einzustellen ist, wurden jene Versuchsbedingungen näher untersucht, die konstant gehalten werden müssen, damit ein reproduzierbares Arbeiten möglich ist.Obwohl die Menge des im Elektrolyten gelosten Sauerstoffes bei allen Begasungsstärken gleich hoch ist, waren die Stromdichten sehr unterschiedlich. Als Ursache dafür wurde ein durch die Begasung hervorgerufener Rühreffekt erkannt. In dem bewegten Elektrolyten wird mehr Sauerstoff an der Kathode elektrochemisch umgesetzt als im ruhenden Elektrolyten.
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  • 16
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 249-258 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Materials of construction for the chemical industry 2nd part: Non-ferrous metalsContinuing the first part of the survey on materials of construction for the chemical industry the following matters are dealt with: Corrosion of cupper, aluminium, nickel, titanium, zirconium, tantalum, precious metals as well as their possibilities of usage in the chemical industry.
    Notes: In Fortsetzung des 1. Teiles der Übersicht über die Konstruktionswerkstoffe für die chemische Industrie werden Korrosionsverhalten von Kupfer, Aluminium, Nickel, Titan, Zirkon, Tantal und Edelmetallen sowie ihre Einsatzmöglichkeiten in der chemischen Industrie behandelt.
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  • 17
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 282-286 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 18
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 286-286 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 19
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 287-287 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 20
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 287-287 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 21
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 22
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 287-288 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 23
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 289-292 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Passivating of Tin-platePassivating solutions are examined for hot-dipped and electrolytically coated tin-plate for the protection against sulphur compounds (food), oxydation in heating and against atmospheric corrosion. Solutions of 0,1-5% of potassium permanganate, potassium dichromate and diluted sulphuric acid with additons of chromate and inhibitors have been employed. The solutions of chromate had a favourable effect only when additons of wetting mediums or phosphates were made. Tin-plate thus treated were resistant for several hours against hot water containing hydrogen sulphide without discolouring and without corrosion starting from the pores. Even the heating of the treated tin-plate up to a temperature of 200° C did not result in any oxydation.
    Notes: Es werden Passivierungslösungen für feuerverzinntes und elektrolytisch verzinntes Weißblech zum Schutz gegen den Angriff von Schwefelverbindungen (Nahrungsmittel) Oxydation beim Erwärmen und gegen die atmosphärische Korrosion untersucht. Verwendet wurden 0,1 bis 5 %ige Lösungen von Kaliumpermanganat, Kaliumdichromat und verdünnte Schwefelsäure mit Zusätzen von Chromaten und Inhibitoren. Die Chromatlösungen zeigten nur dann eine günstige Wirkung, wenn noch Zusätze gemacht wurden. Verzinnte Bleche, die so behandelt wurden, hielten einen mehrstündigen Angriff durch heißes schwefelwasserstoffhaltiges Wasser stand, ohne sich zu verfärben und ohne daß von den Poren aus eine Korrosion stattfand. Auch eine Erwärmung der behandelten Bleche bis auf 200° C führte zu keiner Oxydation.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 296-298 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Rhenium and its to-day's usage in technicRhenium was discovered 26 years ago. It might be the rarest of all stable metals. Only in a few metallurgical products it is enriched to such an extent that its preparation is worthwhile. Owing to the physical and chemical properties of the element, which is nearly related to platinum metals, it could be predicted that it would be suitable for many technical usages. The molten Re-metal has a great hardness, its alloys are also hard and without any brittleness, mostly corrosion without any brittleness, mostly corrosion resistant. These valuable properties have already been practically exploited. In the thermoelements with platinum metals Rhenium has unique properties. The catalytic properties of Rhenium are of particular interest.
    Notes: Das Rhenium wurde vor 26 Jahren entdeckt. Es dürfte das seltenste aller stabilen Metalle sein. Nur in wenigen Hüttenprodukten und Erzen ist es soweit angereichert, daß seine Darstellung lohnt. Die physikalischen und chemischen Eigenschaften des Elementes, das den Platinmetallen nahesteht, ließen voraussehen, daß es sich für zahlreiche technische Anwendungen eignen würde. Das geschmolzene Re-Metall besitzt eine große Härte, seine Legierungen sind ebenfalls hart und ohne Sprödigkeit, meist auch korrosionsbeständig. Diese technisch wertvollen Eigenschaften haben in vielen Fällen bereits praktische Verwertung gefunden. In den Thermoketten mit Platin-metallen besitzt Rhenium singuläre Eigenschaften. Von besonderem Interesse sind die katalytischen Eigenschaften des Rheniums.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 359-359 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 315-316 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 334-339 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 321-334 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Titan and Titan AlloysAt first the raw material basis and the producing of the titan metal from ore are described. In the following the physical and technological properties are discussed. The basis of the preparation of suitable titan alloys with other metals and the influence of non-metallic elements on titan metal are explained. Furthermore, the mechanic properties of binary, ternary and quarternary alloys are described. The heat resistance of some titan alloys is also dealt with. Will be continued.
    Notes: Zunächst werden die Rohstoffgrundlage und die Gewinnung des Titanmetalles aus dem Erz geschildert. Anschließend werden die physikalischen und technologischen Eigenschaften wiedergegeben. Die Grundlagen zur Herstellung brauchbarer Legierungen mit anderen Metallen und der Einfluß nichtmetallischer Legierungs-elemente auf Titan werden klargelegt. Weiterhin werden die mechanischen Eigenschaften von binären, ternären und quarternären Legierungen besprochen. Auf die Hitzebeständigkeit einiger Titanlegierungen wird gleichfalls eingegangen. Fortsetzung folgt.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 409-414 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Steel alloys for manufacturing sheet and form glassThe permanent contact of the viscous glass matter with the forming tools, that are bending- and transporting-rolls for sheet glass-production, matrice-parts for manufacturing form glass, requires the application of alloyed materials of construction in the production of high-class glass qualities. Determining for the selection of the materials are the temperature stressing and the corrosion attack by the furnace gases and by the alkaline substances diffusing from the glass matter. Only for matt glass resp. ornamental glass unalloyed materials can be used.In inland and abroad therefore in the glass industry austenitic Cr-Ni-steels with 20 - 65% Ni are preponderatingly customary. Cr-Si- and Cr-Si-Al-steels with higher cinder- and oxydationrestistance than Cr-Ni-steels are scarcely applied. Examinations in practice and in experiments show the possibility to use steel poor resp. free in Ni. Supposition are high heat proof quality, thermal conductivity and insensibility against temperature variations as well as homogeneous and finegrained structure, because every unevenness of structure is sketched as defect on the glass surface.Proceeding from this aspect the influence of the base-alloys and of the structure are discussed fully and propositions are given for the selection of materials of construction.
    Notes: Die ständige Berührung der zähflüssigen Glasmasse mit den Formwerkzeugen, und zwar den Biege- und Transportwalzen bei der Tafelgas-, den Matrizenteilen bei der Formglasherstellung, erfordert den Einsatz legierter Werkstoffe bei der Fertigung hochwertiger Glassorten. Maßgebend für die Auswahl der Werkstoffe sind die Temperaturbeanspruchung und der Korrosionsangriff durch die Ofengase und den aus der Glasmasse diffundierenden alkalischen Bestandteilen. Nur bei Matt- bzw. Ornamentglas können unlegierte Werkstoffe Anwendung finden.Im In- und Ausland sind deshalb in der Glasindustrie überwiegend austenitische Cr-Ni-Stähle mit 20 - 65% Ni gebräuchlich. Cr-Si- und Cr-Si-Al-Stähle mit Höherer Zunder- und Oxydationsbeständigkeit gegenüber Cr-Ni-Stählen werden kaum verwendet. Überprüfungen betrieblicher und versuchsmäßiger Art lassen aber den Einsatz Ni-armer bzw. Ni-freier Stähle durchaus möglich erscheinen. Voraussetzung sind große Wärmebeständigkeit, Wärmeleitfähigkeit und Unempfindlichkeit gegen Temperaturwechsel sowie einheitliche und feinkörnige Gefügebeschaftfenheit, da jede Ungleichheit des Gefüges sich als Fehler auf der Glasoberfläche abzeichnet. Von diesen Gesichtspunkt aus werden der Einfluß der Grundlegierungen sowie des Gefüges eingehend erörtert und Vorschläge für die Werktoffauswahl gegeben.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 406-406 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 404-405 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 405-406 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 406-407 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 439-439 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 441-444 
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    Description / Table of Contents: Variation of corrosions by wetting agents. II. The influence of non-ionogen wetting agentsSurface-active substance are able to change the corroding effect of tap water on unalloyed steel in a favourable manner, as far as pitting is avoided and only removing tuberculation takes place. Non-ionogen wetting agents are more effective hereby than anion-active ones. A higher decreasing of the surface tension of the water by addition of over 4%0 of the wetting agent raises the efficacy. The chemical constitution of the used surface-active substances, however, seems to be of essential importance.
    Notes: Oberflächenaktive Stoffe können die korrodierende Wirkung von Leitungswasser auf unlegiertem Stahl insofern günstig verändern, als Lochkorrosion vermieden wird und nur noch abtragende Narbenkorrosion auftritt. Nichtionogene Netzmittel sind dabei wirksamer als anionaktive. Eine stärkere Erniedrigung der Oberflächenspannung des Wasser durch Zusatz von je 4%0 des Netzmittels erhöht die Wirkung. Die chemische Konstitution der verwendeten oberflächenaktiven Körper scheint jedoch von wesentlicher Bedeutung zu sein.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 465-468 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 461-464 
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    Description / Table of Contents: Influence of the state of surface on the endurance bending strengthResults of endurance fatigue tests taken from literature are comparable,  -  as well known  - , only in a limited degree. One of the reasons for this disadvantageous limiting in the evaluation is to be found in the differences in the treatment of the surface of the bar. The known performance on the influence of surface qualities and treatment on the fatigue limit gives the highest value for polished surfaces of bar.In contrast hereto lately performed endurance bending tests with non-alloyed steels and brilliant-finish polished bars showed a rotating beam fatigue limit which was 57-18% lower than that on usually smoothed or polished samples. The careful treatment of those bar surfaces was practised by polishing in that manner as in preparing a “metallographic polished specimen”. About one hour of polishing resulted a high-mirror finished surface of bar, free of scratches and grooves. The microhardness of the bar surface has been lowered hereby, e. g. at Armco-iron, from 200 to 130 kg/mm2.For better comparability of results in endurance bending strength stated by different testing offices, the method of treatment of test pieces ought to be indicated.
    Notes: Versuchsergebnisse von Umlaufbiegeversuchen aus dem Schrifttum sind, wie bekannt, nur begrenzt vergleichbar. Einer der Gründe für diese nachteilige Einschränkung bei der Auswertung liegt in Verschiedenartigkeiten bei der Bearbeitung der Staboberfläche. Die bekannte Darstellung über den Einfluß der Oberflächenbeschaffenheit und Bearbeitung auf die Dauerfestigkeit gibt für polierte Staboberflächen den höchsten Wert an.Bei neuerdings durchgeführten Umlaufbiegevrsuchen mit unlegierten Werkstoffen und hochfein polierten Proben war im Gegensatz dazu die Wechselbiegefestigkeit 5-18% niedriger als bei üblich geschliffenen oder polierten Stäben. Die sorgfältige Bearbeitung der Staboberfläche erfolgte hier durch Polieren wie bei der Herstellung eines „metallographischen Schliffes“. Etwa eine Stunde Polierzeit ergab eine spiegelblanke Staboberfläche, frei von Kratzern und Riefen. Die Mikrohärte der Staboberfläche ist dadurch z. B. bei Armco-Eisen von 200 auf 130 kg/mm2 erniedrigt worden.Der Zustand der Bearbeitung von Umlaufbiegeproben sollte zur Verbesserung der Vergleichbarkeit von Ergebnissen der Wechselbiegefestigkeit von verschiedenen Prüfstellen gekennzeichnet sein.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 440-440 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 446-448 
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    Description / Table of Contents: Acid-proof cementsAccordig to the advances in the chemical industry, for new chemical processes always new problems of corrosion are arising and accordingly new tasks for constructions protected against corrosion. In this sphere acid-resisting platings are of great importance. In last time it has succeeded to develop calculation-methods for performing such platings that regard the tension-stresses depending on the variety of the construction elements. In consequence of the demands resulting hereby new cements for platings were developped, which correspond with the tension ratios given by construction, and besides show further improvements in the chemical and physical capacity of resistance.
    Notes: Durch die Fortenwicklung der chemischen Industrie ergeben sich bei neuen chemischen Produktionsverfahren ständig neue Korrosionsprobleme und dementsprechend neue Aufgaben für korrosionsgeschützte Konstruktionen. Auf diesem Gebiet spielen säurefeste Plattenverkleidungen eine große Rolle. In letzter Zeit ist es gelungen, Berechnungsmethoden für die auf der Verschiedenheit der Konstruktionselemente beruhenden Spannungsbeanspruchungen berücksichtigen. Auf Grund der sich hieraus ergebenden Forderungen wurden neue Kittmaterialien für Plattenverkleidungen ausgearbeitet, welche den konstruktionsmäßig vorliegenden Spannungsverhältnissen gerecht werden und außerdem noch weitere Verbesserungen in der chemischen und physikalischen Widerstandsfähigkeit besitzen.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 479-479 
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    Description / Table of Contents: Protective Lead Coating by PaintThe number of metallic pigments capable of being used as a rust preventative is small. Ultra-finely pulverised lead has proved to be far superior to all other metals. However, the addition of a binder in all respects suitable to the pigment is an absolute necessity when lead is used. Chlorinated rubber has been proved to be of particular value in this respect. The use of “Plumbol” paint also applies a coating of lead on the surface of iron, one coat of which has the same protective value as three or four coats of oil-bound paints. Weathering tests have also substantiated the protective value of lead coating paints as compared with the usual oil-bound paints. A maximum of protection is obtained against the action of certain chemical agents (soda lye, potash lye, sulphurous acid, sulphuric acid, acetic acid and other cold dilute acids), but no protection against the effect of nitrose (a solution of nitrosyl sulphuric acid in sulphuric acid, formed in the lead-chamber process) fumes and nitric acid results. Generally speaking, a coating of „Plumbol“ paint affords the same protection as a coating of metallic lead the same thickness.
    Notes: Die Zahl der verwendungsfähigen metallischen Pigmente in Rostschutzfarben ist gering. Feinstgepulvertes Blei zeigt sich allen übrigen Metallen überlegen. Erforderlich ist bei Bleiverwendung ein dem Pigment vollkommen angepaßter Bindemittelzusatz. Chlorkautschuk hat sich hier besonders bewährt. Man erzielt durch den „Plumbol“-Pinselaufstrich gleichsam eine „Verbleiung„ des Eisens. Im Effekt ist ein einmaliger Aufstrich einer 3-4 - fachen Ölfarbauflage ebenbürtig.  -  Bewitterungsversuche zeigen vergleichsweise die wesentlich bessere Schutzwirkung der „Pinselverbleiung“ gegenüber den üblichen Ölanstrichen. Der Schutz erweist sich gegen chemische Agentien (Natronlauge, Kalilauge, schweflige Säure, Schwefelsäure, Essigsäure und andere verdünnte kalte Säure, Schwefelsäure, Essigsäure und andere verdünnte kalte Säure, Essigsäure und andere verdünnte kalte Säuren) als äußerst widerstandsfähig. Nicht jedoch gegen nitrose Gase und Salpetersäure.  -  eine „Plumbol“- Anstrich-Folie bietet im im allgemeinen den gleichen Schutz wie eine Schicht von metallischem Blei gleicher Dicke.
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 237-237 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. I 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 178-182 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Temporary Anti-corrosive MeasuresThe article opens with a survey of the various methods employed for ensuring temporary protection against rust. The following points are then discussed:  -  creation of a non-corrosive ambient atmosphere, use of special removable protective coatings (having an oil, wax or patty base). Particular attention is paid to the use of Dicyclorhexylammonium nitrite (VPI) and to modern anticorrosion compounds having a mineral oil base. Some practical examples of the application of these protective coatings for interior and exterior surfaces are included. The removal of such coatings is then discussed. The article closes with a brief discussion on tests suitable for testing temporary anti-corrosive compounds. A compendious bibliography on the subject is appended.
    Notes: Es wird eine Übersicht über die verschiedenen Methoden des temporären Rostschutzes gegeben. Behandelt werden: Schaffung einer nicht angreifenden Atmosphäre  -  Verwendung geeigneter Schutzüberzüge (abziehbar und auf der Basis von Ölen, Wachsen und Fetten). Besonders eingegangen wird auf den Schutz durch Dicyclohexylammoniumnitrit (VPI) und auf moderne Rostschutzmittel auf der Mineralölbasis. Praktische Beispiele für die Anwendung dieser Rostschutzmittel für innere und äußere Oberflächen werden angegeben. Dann wird die Entfernung der Überzüge besprochen. Zum Schluß werden verschiedene Kurzprüfungen für temporäre Rostschutzmittel diskutiert und das ziemlich umfangreiche Schrifttum angegeben.
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 182-184 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 192-194 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 271-274 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 277-277 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 72-73 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 418-420 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 422-424 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 425-430 
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    Description / Table of Contents: Reactions in the Intermediate Stratum between Iron and Coating Systems and the Effect of InhibitorsCorrect surface pre-treatment of iron and steel is regarded as irremissible for good performance and maximum service life of a coating system in corrosion control. The peculiar features of surface texture are characterized by a mosaic of anodic and cathodic ranges. Industry's tendency to speed up every process to the utmost calls for quick drying paints. Their wetting properties and their water permeability determine adhesion characteristics and electrochemical attack. Therefore, the paint chosen has to correspond with the pre-treatement applied to the surface or vice versa. The addition of suitable inhibitors contributes to the efficiency and performance of the coating. Combinations of inhibitors with ionadsorbing film-forming materials create an active intermediate stratum between metal and paint, improving adhesion and preventing corrosion. The development of a special surface-technology is necessary for pursuing the aim of prolonging the life of steel structures and/ or reducing maintenance costs, even under the most severe service conditions.
    Notes: Eine fachgemäße Vorbehandlung der Oberfläche von Eisen und Stahl, die als Mosaik anodischer und kathodischer Bereiche aufgefaßt werden kann, ist für dauerhafte Rostschutzanstriche eine unerlässliche Vorbedingung. Das moderne Fertigungstempo zwingt die Industrie zur Verwendung rasch trocknender Anstriche; deren Benetzungsvermögen bedingt die Haftung und deren Wasserdurchlässigkeit die elektrochemischen Vorgänge in der Grenzschicht. Die Anstriche müssen also der Vorbehandlung des Eisens entsprechen, oder diese Vorbehandlung hat sich nach den gewählten Anstrichmitteln zu richten. Zusatz geeigneter Hemmstoffe verbessert die Rostschutzwirkung erheblich. Kombinationen von Hemmstoffen mit ionenabsorbierenden Filmbildern führen zu aktiven Zwischenschichten, die zur Erhöhung der Haftfestigkeit und zur Verhütung von Unterrostungen beitragen. Schließlich wird eine Oberflächen-Technologie postuliert, die sich die Verlängerung der Lebensdauer von Stahlkonstruktionen und/oder eine Verminderung ihrer Unterhaltskosten, auch unter schwierigsten äußeren Bedingungen, zum Ziel setzt.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 77-77 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 81-81 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 82-83 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 237-237 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 244-246 
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    Description / Table of Contents: The Influence of Soil Dampness on the Velocity of Corrosion of Iron and lead in the EarthThe rate of corrosion of Iron and Lead was examined with respect to the element Pt/dam soil/base metal. It was found that, in sandy and clay sols, there are two varieties of corrosion, namely active behaviour of Iron and passive behaviour of Lead.
    Notes: Die Korrosionsgeschwindigkeit von Eisen und Blei wurde an dem Element Pt/feuchter Boden/unedleres Metall untersucht. Dabei ergab sich, daß in sand- und tonhaltigem Boden zwei Korrosionsarten zu unterscheiden sind, nämlich ein aktives Verhalten des Eisens und ein passives Verhalten des Blei.
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 251-257 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: The Roof and its problems, with Special Reference to Flat RoofsThe demands of Builders and Users that a roof is required to meet, have changed decisively during the last decades. The disappearance of garrets, the use of flat roofs and present-day sawtoothed roofs required that a number of additional precautions be observed, which are supplemented by recognition of thier constructional and utilisation limitations. Some of the most important demands of to-day, such as minimum constructional requirements, heat retention, limitations of roof characteristics, properties of materials and desirable developments are indicated. Special emphasis is laid on the various effects of dampness and their prevention. The importance of the structure of the roof and ventilation are also emphasised.
    Notes: Die baulichen und benutzungsmäßigen Anforderungen an das Dach haben sich in den letzten Jahrzehnten in entscheidenden Teilen gewandelt. Wegfall des Dachraumes, Flachdächer und neuzeitlich Sägedachformen (Sheds) bedingen eine Reihe zusätzlicher Vorkehrungen, die ergänzt werden durch neue Erkenntnisse über konstruktive und benutzungsmäßige Bedingtheiten. Einige der wichtigsten neuen Forderungen, wie Konstruktions-Mindestforderungen, Wärmedämmung, Wärmestau, Abgrenzung der Dacheigenschaften, Material-Eigenschaften und erwünschte Entwicklungen werden aufgezeigt. Besonderer Nachdruck wird auf die unterschiedlichen Formen der Feuchtigkeitseinwirkungen und ihrer Abwehr gelegt und die Bedeutung ausreichender Dachaufgliederung und Lüftung nachgewiesen.
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 257-264 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 266-267 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 267-269 
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    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 269-271 
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    Notes: Allgemeine Eignung von Graphit als Apparatewerkstoff  -  Entwicklung von Graphitwärmeaustauschern durch die I. G. Farbenindustrie, Bitterfeld  -  Imprägniermittel und -verfahren zur Verringerung der Porosität des Graphits  -  Verbindung von Bauelementen aus Graphit.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 106-107 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 95-101 
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    Notes: Korrosionsschäden in Erdöl-Förderanlagen  -  Labor- und Betriebs-Korrosionsversuche mit Cr-, Ni-, und Cr/Ni-Stählen in korrosiven Erdöl-Gaskondensaten  -  Gefüge, mechanisches und chemisches Verhalten von 12%igem Cr-Stahlguß.Überblick über die neuere Entwicklung aushärtbarer Cr/Ni-Stähle  -  Aushärtungseffekt durch die Nichtcarbidbildner Al u. Cu  -  Gefüge, Warmbehandlung, mechanisches und chemisches Verhalten (gegen Säuren, Basen, Salze) von Cr/Ni/Cu, und Cr/Ni/Al-Stahl.
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