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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 331-340 
    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: Korrosionsmorphologie der Magnesiumlegierung AZ 91Die Initiierung und die Fortpflanzung von Lochkorrosion und fadenförmiger Korrosion wurde an der unbeschichteten Legierung AZ91 (9% Al, 1% Zn) mittels Tauchversuchen, elektrochemischen Messungen und mikroanalytischen Methoden untersucht. Es wurde eine Vielzahl von Initiierungsbereichen festgestellt. Von diesen Punkten breitet sich die Korrosion für einen begrenzten Zeitraum in Form fadenförmiger Angriffe aus, der später in Lochfraß mit zellenartiger, Erscheinungsform übergeht.Die wichtigsten Parameter, die die fadenförmige Korrosion beeinflussen, sind Temperatur, Werkstoffstruktur und Grad der Polarisation an den anodischen Bereichen. Der fadenförmige Angriff an der Legierung AZ91 wird abweichend von dem klassischen Mechanismus, der für beschichtete Metalle gilt, durch die Wasserstoffentwicklung an den kathodischen Bereichen der Oberfläche angetrieben. Der Vorgang ist anodisch kontrolliert und läuft mit hoher, konstanter Geschwindigkeit ab, unabhängig vom Grad der Polarisation entlang bevorzugter, durch die Zusammensetzung sowie kristallographischer Faktoren bestimmter Pfade. Es handelt sich um ein temporäres Phänomen ohne Einwirkung von äußeren elektrischen Strömen. Mit abnehmender anodischer Polarisation wird Lochkorrosion ausgeprägter.
    Notes: Initiation and early propagation of pitting and filiform corrosion on bare alloy AZ91 (9% Al, 1% Zn) are investigated by natural immersion corrosion tests, electrochemical measurements and microanalytical studies. Initiation sites are few. Corrosion spreads from these sites first in the form of filiform corrosion for a limited period of time and pitting which later develops into a cellular type of etching. The important factors affecting filiform corrosion are temperature, material structure and degree of polarization at the anodic sites. Filiform attack on AZ91, unlike the classical mechanisms of filiform corrosion on coated metals, is driven by hydrogen evolution reaction on the cathodic sites of the surface, occurs under significant anodic control, propagates at a high, constant speed independent of degree of polarization along preferential paths determined by compositional and crystallographic factors, and is a temporary phenomenon under open circuit conditions. Pitting corrosion is more predominant with decreasing anodic polarization.
    Additional Material: 15 Ill.
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  • 2
    ISSN: 0899-0042
    Keywords: 3-(S)-(1-phenylethyl)-2-thioxo-2,3-dihydro-1,3-thiazol-4(5H)-ones ; 3-(S)-(1-phenylethyl)-rhodanines ; CD spectra ; empirical force field calculations ; theoretical calculation of CD spectra ; chromatographic diastereomer separation ; triacetylcellulose ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-(S)-(1-phenylethyl)-5-methyl- and 5-phenyl-rhodanine have been studied by single crystal X-ray crystallography. The crystals of the 5-methyl compound were shown to contain equal amounts of the 5-(R) and 5-(S) diastereomers, while the crystals of the 5-phenyl compound only contain the 5-(S) diastereomer. The UV and CD spectra of the 5-H2 compound have been analyzed on the basis of CNDO/S calculations, and the CD spectrum has been reproduced by semiempirical calculations.The 5-methyl diastereomers can be partly separated by chromatography on triacetylcellulose, and the CD spectra of the individual forms can be evaluated. The 5-phenyl compound undergoes rapid epimerization in solution, and also for this compound the CD spectra of both forms can be evaluated. The contribution of the 5-substituent follows Ripperger's sector rule for dithiocarbamates. Chirality 9:568-577, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 30 (1947), S. 43-77 
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four thiophene derivatives have been obtained unexpectedly from the reaction of N-phenylacetyithiobenzamides with P4S10 in boiling carbon disulfide. The structure of one of these was established by X-ray crystallography.
    Additional Material: 1 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 368 (1969), S. 44-52 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction of diethylaluminiumchloride with chlorine azide at 25-30 °C leads to the trimeric ethylaluminiumchloridazide [C2H5AlClN3]3. This compound is an oily, colourless, and very hygroscopic liquid which can be distilled in vacuo, but slowly decomposes by formation of ethylaluminiumdichloride and ethylaluminiumdiazide. The vibrational spectrum (IR und RAMAN) indicates a structure consisting of a six-membered Al—N-ring (symmetry C3v).
    Notes: Bei der Reaktion von Diäthylaluminiumchlorid mit Chlorazid bei 25-30 °C entsteht trimeres Äthylaluminiumchloridazid, [C2H5AlClN3]3. Die Verbindung stellt eine ölige, farblose, sehr hygroskopische und im Vakuum destillierbare Flüssigkeit dar, die sich langsam unter Bildung von Äthylaluminiumdichlorid und Äthylaluminiumdiazid zersetzt. Nach dem Schwingungsspektrum (IR und RAMAN) liegt ein über die α-N-Atome der Azidogruppen verknüpfter Al—N-Sechsring vor (Symmetrie C3v).
    Additional Material: 2 Ill.
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