Composite surface treatment agent

Abstract

The invention discloses a composite surface treatment agent comprising the following components of, by mass, 50 parts of aminosilane, 15 parts of monohydric alcohol, 3 parts of ethyl acetate, 8 partsof N,N-dimethylformamide, 10 parts of ethanol, 5 parts of trans polyether, 6 parts of glycerin, 4 parts of dibutyl phthalate, 3 parts of alkyl acidic phosphate, 2 parts of ferrous sulfate, 2 parts ofpotassium sodium tartrate, 12 parts of molybdate, 9 parts of phthalic anhydride, 10 parts of polytetrafluoroethylene, 4 parts of alkyl glycoside and 5 parts of barium petroleum sulfonate. The composite surface treatment agent is free of phosphorus and other harmful elements which pollute the environment in the use process. Compared with existing phosphorus-free surface treatment agents, the composite surface treatment agent has the advantages that a film formed on the surface of metal treated with the composite surface treatment agent is thick, thus physical bonding capacity of the metal and electrophoresis paint is enhanced, and then the metal obtained after electrophoresis painting is also improved greatly in corrosion resistance and throwing power.

Description

technical field [0001] The present invention relates to a surface treatment agent. Background technique [0002] Metal materials usually need surface treatment before electrophoretic coating to enhance the adhesion between metal and paint. At present, the metal surface treatment technology before electrophoretic coating mostly adopts phosphating treatment process. However, because this treatment method contains harmful heavy metal ions such as zinc and nickel and chemical components such as phosphorus, and will produce a large amount of phosphating slag during the treatment process, it will cause great harm to the environment. Furthermore, the phosphating treatment technology consumes The performance is relatively large, and the degree of dependence on the previous surface adjustment process is large, which also increases the processing cost and management difficulty. As a non-phosphorus pretreatment technology that can replace the traditional phosphating treatment, there a...

AI Technical Summary

Problems solved by technology

However, the thickness of the film formed by these two phosphorus-free pretreatment methods on the metal surface is much thinner than that of the traditional phosphating film, and the corrosion resistance of the film layer and the physical bonding ability with the subsequent coating are also weak. There is the disadvantage of low throwing power when the treated metal is used in conjunction with ordinary electrophoretic coatings, which will cause thinner electrophoretic paint films in the inner cavity of the workpiece, which will lead to corrosion and perforation. Therefore, the current two phosphorus-free pretreatment methods It is far from the level of traditional phosphating technology. Therefore, a method that can effectively avoid the environmental pollution caused by phosphorus treatment process can also form a thicker film on the treated metal surface, which can effectively improve the relationship between metal and phosphating. It is necessary to develop a surface treatment agent for the physical binding ability of subsequent electrophoretic coatings