Patent ID: 9650521
Date: 2017-05-16
CPC Classifications: C08G,C09D,C23C

Claim:
1. A method for forming a top coating on a hexavalent chromium-free trivalent chromium chemical conversion film or a chromium-free chemical conversion film, the method comprising the step of immersing the hexavalent chromium-free trivalent chromium chemical conversion film or the chromium-free chemical conversion film in a top coating agent or applying a top coating agent to the hexavalent chromium-free trivalent chromium chemical conversion film or the chromium-free chemical conversion film with a spray, wherein the top coating agent comprises: a polyoxyalkylene fatty acid ester in an amount of 1 to 100 g/L; a modified organopolysiloxane; a water-soluble glycol ether; and water.