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Chromated layer as an Anti‐tarnish protection of AuAgCu alloys
Author(s) -
Randin J.P.
Publication year - 1992
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19920430406
Subject(s) - tarnish , metallurgy , abrasive , materials science , polishing , layer (electronics) , auger electron spectroscopy , alloy , electrolyte , composite material , electrode , chemistry , physics , nuclear physics
The electrochemical chromatation was carried out on a 14 ct AuAgCu alloy used in decorative applications as an anti‐tarnish treatment. The influence of the electrolyte composition and deposition parameters was studied. The tarnish resistance of the chromated layer was investigated in particular with respect to a previous mild abrasive treatment. Auger Electron Spectroscopy was used to estimate the thickness of the film as a function of the chromatation time. The chromated layer does not change the aspect of the alloy and provides a very efficient protection against tarnishing. It is very thin and does not withstand the abrasive effect of a polishing cloth commonly used by the jewellers. By contrast, it can be cleaned in isopropanol without any decrease in its tarnish resistance.