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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 183-194 
    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: Investigations into the electrolytic-potentiostatic etching of stainless steels in 10 n NaOH, using a coulometerCurrent density/potential characteristics can only provide qualitative indications concerning the phenomena encountered with potentiostatic etching in 10 n NaOH. The process is best carried out in the trans-passive zone. Identification is based, not on the selective dissolution of certain standard components, but on the interference colours which can be observed as a result of the formation of cover layers of different thickness. The charge density/time characteristics also permit quantitative indications of the different phases. Current density/time curves permit a clarification of the mechanism govering the formation of cover layers. A ferritic steel (28 pC Cr) and a NiCr alloy (45 pC Cr) were found to follow a cubic law of growth, whilst CrNi steel 18-8 is initially governed by an approximately logarithmic law, followed by a zone extending over several hours where the growth begins to follow a parabolic law.
    Notes: Stromdichte-Potential-Kurven ermöglichen nur qualitative Aussagen über die Vorgänge beim potentiostatischen Ätzen in 10 n NaOH. Am günstigsten ist Ätzen im Transpassivbereich. Die Identifizierung erfolgt dabei nicht durch selektive Auflösung bestimmter Gefügebestandteile, sondern aufgrund der Interferenzfarben, die infolge der Bildung unterschiedlich starker Deckschichten zu beobachten sind. Die Ladungsdichte-Zeit-Kurven ermöglichen auch Aussagen über die Mengen der einzelnen Phasen. Stromdichte-Zeit-Kurven ermöglichen eine Aufklärung des Deckschichtbildungsmechanismus. Für einen ferritischen Stahl (28% Cr) und eine NiCr-Legierung mit 45% Cr gilt ein kubisches Wachstumsgesetz, während für CrNi-Stahl 18-8 zunächst ein annähernd logarithmisches Gesetz gilt, an das sich ein mehrstündiger Bereich anschließt, in dem übergang zu einem parabolischen Schichtwachstum erfolgt.
    Additional Material: 24 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 560-568 
    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: Precipitation and corrosion behaviour of unstabilized and stabilized 18 10 CrNi steels after short term sensibilizing annealingThe authors have studied the precipitation behaviour of the steels X5 CrNi 18 9, X10CrNiTi 18 9 and X 10CrNiNb 18 9 after solution and sensibilization annealing, and the intercrystalline corrosion behaviour in the Straußtest. On the basis of the results obtained it was possible to determine the and carbonitrides and to define the grain segregation ranges. In the case of the unstabilized materials the behaviour is a function of the formation of chromium depleted zones. However, it is not absolute value of the depletion at the carbid/austenite interphase which controls corrosion, but the depletion in an adjacent zone of measurable thickness. Beyond that the Huey test allows the corrosion susceptibility to be determined in those regions where no continuous chromium depleted zone exists. In the case of stabilized steels the corrosion behaviour depends in addition from carbonitride precipitation, since these compounds are heavily attacked by the boiling nitride acid.
    Notes: Die Verfasser untersuchten das Ausscheidungsverhalten der Stähle X 5 CrNi 18 9, X 10CrNiTi 18 9 und X 10CrNiNb 18 9 nach Lösungs- und Sensibilisierungsglühen sowie das Verhalten gegen interkristalline Korrosion im Strauß-Versuch. Aufgrund der Ergebnisse konnte die Art der Ausscheidungen bestimmt werden (Karbid M23C6 und Karbonitride) und auch die Kornzerfallsbereiche konnten definiert werden. Im Falle des nichtstabilisierten Materials ist das Verhalten abhängig von der Bildung von chromveramten Zonen; dabei ist jedoch nicht die absolute Höhe der Verarmung an der Grenzfläche Kabid/Austenit ausschlaggebend, sondern vielmehr die Verarmung in einer Zone meßbarer Dicke. Im Huey-Versuch läßt sich außerdem die Korrosionsanfälligkeit in den Zonen ermitteln, wo keine zusammenhängende Chromverarmungszone vorliegt. Im Falle der stabilisierten Stähle ist das Korrosionsverhalten außerdem abhängig von der Karbonitridausscheidung, da diese Ausscheidungen von der siedenden Salpetersäure stark angegriffen werden.
    Additional Material: 12 Ill.
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  • 3
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 1 (1950), S. 430-430 
    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
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 15 (1964), S. 621-631 
    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 relationship of the intercrystalline corrosion of a non-stabilised 18/10-chromium-nickel steel with some test solutions and with the potential in boiling 2 n H2SO4Specimens of an austenitic 18/20 nickelchromium steel with about 0.06 pC C, quenched at 1300° C and annealed for different periods of time at 550 or 675° C were potentiostatically subjected to the attack of boiling 2n-H2SO4, of a nitric / hydrofluoric acid pickle at room temperature, and of boiling acids in accordance with the Strauss, Huey and Streicher test. Subsequently, the corrosion rates were determined by weighing and the corrosion examined by visual inspection and microscopically.In the active and passive condition grain boundary corrosion is only encountered after sensitizing annealing. In this connection, the potential merely determines the intensity of the grain boundary attack, but not its occurrence as such. The influence of the potential is more marked at higher than at lower sensitizing annealing temperatures. The test results can easily be interpreted with the aid of the chrome reduction theory.In the transition zone to the transpassive condition, and in the latter, an intercrystalline corrosion attack occurs which depends but little on the sensitizing annealing, and which also occurs with solution-annealed specimens. It is also in this zone of the potential that the non-potentiostatic tests according to Huey and Streicher are carried out.The test results show a specific reaction to chrome reduction of the corrosion attack in the active and passive condition, i.e. the attack in the hydrofluoric/nitric acid pickle and in the Strauss solution. In contrast, the Huey and Streicher tests additionally bring in other properties which, in the main, have an influence on the excess potential of the cathodic part-reaction. These testing agents cannot be regarded as specific criteria for the grain decomposition proneness.
    Notes: Proben eines austenitischen 18/10-Chrom-Nickel-Stahles mit etwa 0,06% C, die von 1300° C abgeschreckt und verschieden lange bei 550 und 675° C geglüht worden waren, wurden potentiostatisch dem Angriff siedender 2n-H2SO4, einer Salpetersäure-Flußsäure-Beize bei Raumtemperatur sowie dem Angriff siedender Säuren entsprechend dem Strauß, Huey- und Streicher-Test unterworfen. Anschließend werden die Korrosionsgeschwindigkeiten durch Wägung bestimmt und der Korrosionsangriff visuell und mikroskopisch im Schliffbild untersucht.Im Aktiv- und Passivzustand tritt Korngrenzenkorrosion nur nach einer Sensibilisierungsglühbehandlung auf. Das Potential bestimmt hierbei nur die Intensität des Korngrenzenangriffs und nicht das Auftreten desselben an sich. Der Einfluß des Potentials ist bei hohen Sensibilisierungslühtemperaturen stärker ausgeprägt, als bei niedrigen Temperaturen. Die Versuchsergebnisse lassen sich mit Hilfe der Chromverarmungstheorie zwanglos deuten.Im Übergangsbereich zum Transpassivzustand erfolgt ein interkristalliner Angriff, der nur wenig von der Sensibilisierungsglühbehandlung abhängt und auch bei lösungsgeglühten Proben auftritt. In diesem Potentialbereich erfolgen auch die nicht potentiostatischen Prüfungen nach Huey und Streicher.Die Versuchsergebnisse zeigen, daß der Angriff im Aktiv- und Passivzustand, also der Angriff in der Flußsäure-Salpeter- Beize und in der Straußschen Lösung, spezifisch auf Chromverarmung ansprechen. Beim Huey- und Streicher-Test werden dagegen zusätzlich noch Eigenschaften, die im wesentlichen die Überspannung der kathodischen Teilreaktion beeinflussen, miterfaßt. Diese Prüfmittel können nicht als spezifisch für die Kornzerfallsanfälligkeit angesehen werden.
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  • 6
    Publication Date: 2016-08-13
    Description: Author(s): Robert Schmidt, Ashish Arora, Gerd Plechinger, Philipp Nagler, Andrés Granados del Águila, Mariana V. Ballottin, Peter C. M. Christianen, Steffen Michaelis de Vasconcellos, Christian Schüller, Tobias Korn, and Rudolf Bratschitsch We control the linear polarization of emission from the coherently emitting K + and K − valleys (valley coherence) in monolayer WS 2 with an out-of-plane magnetic field of up to 25 T. The magnetic-field-induced valley Zeeman splitting causes a rotation of the emission polarization with respect to the e… [Phys. Rev. Lett. 117, 077402] Published Fri Aug 12, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 7
    Publication Date: 2011-11-19
    Description: Author(s): M. Hirmer, M. Hirmer, D. Schuh, W. Wegscheider, T. Korn, R. Winkler, and C. Schüller [Phys. Rev. Lett. 107, 216805] Published Fri Nov 18, 2011
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
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  • 8
    Publication Date: 2011-02-12
    Description: Author(s): J. Lienemann, A. Schüller, D. Blauth, J. Seifert, S. Wethekam, M. Busch, K. Maass, and H. Winter The coherence for diffraction effects during grazing scattering of fast hydrogen and helium atoms from a LiF(001) surface with energies up to some keV is investigated via the coincident detection of two-dimensional angular distributions for scattered projectiles with their energy loss. For keV H ato... [Phys. Rev. Lett. 106, 067602] Published Fri Feb 11, 2011
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
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  • 9
    Publication Date: 2018-05-19
    Description: Author(s): Marvin Kulig, Jonas Zipfel, Philipp Nagler, Sofia Blanter, Christian Schüller, Tobias Korn, Nicola Paradiso, Mikhail M. Glazov, and Alexey Chernikov Photoluminescence experiments in the ultra-low density limit of an individual exciton reveal an enhanced exciton diffusion effect in atomically thin WS 2 monolayers. [Phys. Rev. Lett. 120, 207401] Published Fri May 18, 2018
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
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  • 10
    Publication Date: 2018-08-03
    Description: Author(s): Philipp Nagler, Mariana V. Ballottin, Anatolie A. Mitioglu, Mikhail V. Durnev, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Christian Schüller, Mikhail M. Glazov, Peter C. M. Christianen, and Tobias Korn Atomically thin semiconductors provide an ideal testbed to investigate the physics of Coulomb-bound many-body states. We shed light on the intricate structure of such complexes by studying the magnetic-field-induced splitting of biexcitons in monolayer WS 2 using polarization-resolved photoluminescen... [Phys. Rev. Lett. 121, 057402] Published Thu Aug 02, 2018
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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