Anode for chromium plating and processes for producing and using the same
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United States of America Patent
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Aug 3, 1993
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N/A
app pub date -
Sep 4, 1991
filing date -
Sep 4, 1990
priority date (Note) -
Expired
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Abstract
There are described an anode, a process for producing the same, an apparatus for electrolytic chromium plating, and a method for electrolytic chromium plating, using such anode, wherein the anode comprises an electrically conductive substrate comprising a valve metal or an alloy thereof, a first intermediate layer formed on the sustrate and comprising an oxide of tin, a second intermediate layer formed on the first intermediate layer and comprising either (1) platinum metal and an oxide of tin, or (2) platinum metal, an oxide of tin, and iridium oxide, and a surface layer formed on the second intermediate layer and comprising either (1) platinum metal and an oxide of tin, or (2) platinum metal, an oxide of tin, and iridium oxide, the composition of said surface layer being different form that of said second intermediate layer.
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