method for removing a chromium oxide coating from a surface of a nickel based superalloy article

摘要

"chemical removal of a chrome oxide coating from an article". a chromium oxide coating (36) is removed from a surface of the article (18) by wiping the article (18) in an alkaline degreasing / rust removal solution at about 82.2Â ° C ( 180 198 f) conditioning the scaled article (18) in an alkaline permanganate conditioning solution to a conditioning temperature of about 71 198 c (160 198) and contacting the article (18) ) in an extraction solution comprising hydrochloric acid and an acid etching inhibitor at an extraction temperature of about 54.4 c (130 f) to about 60 c (140 c 198 c). f).