Plating bath and process for making microporous chromium deposit

Chemistry: electrical and wave energy – Processes and products

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C25D 310

Patent

active

048657000

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.

REFERENCES:
patent: 3282810 (1966-11-01), Odekerken
patent: 3625039 (1971-12-01), Kubach et al.
patent: 3745097 (1973-07-01), Chessin et al.
patent: 3825478 (1974-07-01), Clauss et al.
patent: 4007099 (1977-02-01), Wu
patent: 4472249 (1984-09-01), Chessin

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