Chemical removal of a chromium oxide coating from an article
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Nov 26, 2001
filing date -
Nov 26, 2001
priority date (Note) -
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Abstract
A chromium oxide coating is removed from a surface of an article by cleaning the article in an alkaline degreasing/rust removal solution at a degreasing/rust removal temperature of from about 180.degree. F. to about 200.degree. F., scale conditioning the article in an alkaline permanganate conditioning solution at a scale-conditioning temperature of from about 160.degree. F. to about 200.degree. F., and contacting the article to an acidic stripping solution comprising hydrochloric acid and an etching inhibitor at a stripping temperature of from about 130.degree. F. to about 140.degree. F.
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