Patent ID: 8691028
Filing Date: 2014-04-08
Classification: B05D,C23C

Abstract:
1. A method for protecting a surface of a metallic article, comprising the steps of preparing a reactive solution of an oxidized form of an electrically conducting polymer and an acid, wherein the acid comprises a mixture of formic acid and di-chloroacetic acid in a ratio of 80 parts by volume formic acid and 20 parts by volume di-chloroacetic acid; thereafter applying the reactive solution to the surface of the article, the reactive solution reacting with the surface of the article to form an adherent conversion coating comprising a reduced polyaniline salt and an oxide on the surface; thereafter oxidizing the adherent conversion coating to form an oxidized coating; and thereafter contacting a non-chromate, reversibly oxidizable inhibitor and the oxidized coating to cause a fixing reaction that forms a fixed conversion coating on the surface of the article such that the fixed conversion coating, when damaged, releases a chromate-free inhibitor by a reversal of the fixing reaction.