Plating bath and process for making microporous chromium deposits
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United States of America Patent
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Sep 12, 1989
Issued Date -
N/A
app pub date -
Aug 3, 1988
filing date -
Feb 13, 1987
priority date (Note) -
Expired
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Abstract
A composition and method are disclosed for electroplating microporous chromium layers without the requirement that microparticles be present either in the chromium layer or in a sublayer. A composition used contains chromic acid and sulfoacetic acid and, optionally, dichromate ion, sulfate ion and/or fluoride ion but being substantially free of iodide, selenide or bromide ions. A deposit having at least 20,000 micropores per square inch results. The process may be used to make multiple layer articles having an outer layer of microporous chromium.
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