Hydrogen Content in Chromium and Multilayer Nickel-Chromium Coatings Deposited by Periodic Current

The hydrogen content in electroplated chromium layers and multilayer nickel-chromium coatings applied by periodic current from sulfate-oxalate baths is discussed. Chromium electroplating at periodic and pulsed currents is found to increase the hydrogen content to 54 cm3/g as compared with 24 cm3/g f...

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Bibliographic Details
Published in:Protection of metals 2003-09, Vol.39 (5), p.405-410
Main Authors: Edigaryan, A A, Lubnin, E N, Lyakhov, B F, Molodkina, E B, Polukarov, Y M
Format: Article
Language:English
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Summary:The hydrogen content in electroplated chromium layers and multilayer nickel-chromium coatings applied by periodic current from sulfate-oxalate baths is discussed. Chromium electroplating at periodic and pulsed currents is found to increase the hydrogen content to 54 cm3/g as compared with 24 cm3/g for chromium deposits obtained in a direct-current mode. The hydrogen content in multilayer Ni-Cr coatings is found to be substantially lower. As shown by mass-spectrometric studies, hydrogen preferentially absorbs in chromium layers. The peculiarities of concurrent hydrogen evolution and chromium deposition giving supersaturated solid solutions are discussed.
ISSN:0033-1732
DOI:10.1023/A:1025826231711