Improved process for the formation of a pelu00eccula oxide cobalt conversion coating solution and conversion coating chemistry going on

摘要

Process for the formation of a pelu00eccula improved oxide cobalt conversion coating solution and conversion coating chemistry going on. The process perfected which is commercially practical for the formation of a film of cobalt oxide conversion coating which has corrosion resistance properties and adhesion toThe paint on a substrate, where the substrate is aluminium or an aluminium alloy.The process including the steps of: (a) providing a solution of film forming of the cobalt oxide conversion comprising an aqueous solution of reaction, not containing trietanclamina (tea)Prepared by the reaction of the starting materials: (1) a cobalt salt II Cox ~ 2 ~ soluble in water, where x = Cl, Br, ~ 3 ~, CN, SCN, 1 / 3 Po ~ 4 ~ so ~ 4 ~ 1 / 2, 1 / 2 CO 3 ~ ~., formate,Or acetate; (2) a complexing agent soluble in water, is selected from the group consisting of 'main ~ 2 ~, MEAC, mefm, NH ~ 4 ~ AC, and NH ~ 4 ~ FM, where m is Na, K,Or read; AC is acetate and formate; FM is; (3) an accelerator selected from the group consisting of NaClO ~ 3 ~, nabro ~ 3 ~.And NaIO ~ 3 ~; (4) water; and (b) contacting the substrate with an aqueous solution of reaction for a sufficient period of time to oxidize the surface of the substrate.By means of the film of cobalt oxide conversion coating is formed, thereby conferring properties of corrosion resistance and adhesion to the coating to the substrate.It is also disclosed a solution of chemical conversion coating which is commercially practical for the production of a film oxide cobalt conversion coating on a substrate of alumu00ednIO or aluminium alloy, said solution comprising an aqueous solution of reaction, not containing triethanolamine (tea).Prepared by the reaction of the following primers: (1) a cobalt salt II Cox ~ 2 ~ soluble in water, where x = Cl, Br, ~ 3 ~, CN, SCN, 1 / 3 Po ~ 4 ~ so ~ 4 ~ 1 / 2, 1 / 2 Co ~ 3 ~. Formate.Or acetate; (2) a complexing agent soluble in water, selected from the group consisting of the main ~ 2 ~, MEAC, mefm, NH ~ 4 ~ AC, and NH ~ 4 ~ FM, where m is Na, K,Or read; AC is acetate and formate; FM is; (3) an accelerator selected from the group consisting of NaClO ~ 3 ~, nabro ~ 3 ~, and NaIO ~ 3 ~; and, (4) water.