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Identification of the corrosion products formed on copper in sulfur containing environments

✍ Scribed by C. Fiaud; M. Safavi; J. Vedel

Publisher
John Wiley and Sons
Year
1984
Tongue
German
Weight
402 KB
Volume
35
Category
Article
ISSN
0947-5117

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✦ Synopsis

Tarnishing layers grown on copper exposed to air contaminated by traces of sulfur dioxide and/or hydrogen sulfide were detected by a coulometric and characterized by a chemical method. Depending on the nature of the corrosive gas, or on the use of a gas mixture, it was found that sulfate, sulfide, oxides or a mixed oxide-sulfide compound could be formed in these conditions. The same tarnishing products were found, either in hydrogen sulfide or in a sulfur dioxide + hydrogen sulfide mixture, and the same linear growth law of the copper (I) sulfide was also found, within the limits of the duration of the corrosion test, in the two gaseous environments.

Die auf Kupfer in mit Spuren von Schwefeldioxid undioder Schwefelwasserstoff verunreinigter Luft entstandenen Anlaufschichten wurden mit coulornetrischen Methoden nachgewiesen und mit einer chemischen Methode identifiziert. Aufgrund der Ergebnisse entstehen je nach dem einwirkenden aggressiven Gas bzw. Gasgemisch Sulfate, Sulfide, Oxide oder Gemische von Oxiden und Sulfiden. Sowohl in Schwefelwasserstoff als auch in dessen Gemischen mit Schwefeldioxid treten die gleichen Produkte in den Anlaufschichten auf, und fur die Bildung von Cu(1)sulfidschichten gilt (im Rahmen der benutzten Versuchsdauer) in beiden Medien das gleiche lineare Zeitgesetz.

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