Patent ID: 8486203
Filing Date: 2013-07-16
Classification: C23C

Abstract:
1. An aqueous coating composition for treatment of surfaces of metals and solid substrates, comprising: (A) at least 0.01 gram/liter of at least one water-soluble divalent zinc compound; (B) at least 0.2 gram/liter of at least one complex fluoride compound; (C) at least 0.01 gram/liter of at least one chelating- or multidentate ligand-containing organic compound selected from one or more of salicylaldoxime, benzaldoxime, methylbenzamide oxime, (trifluoromethyl)benzamidoxime and 3,5-bis(trifluoromethyl)benzamidoxime; and (D) wherein the aqueous coating composition is substantially free of chromium ion.