Silane-nanoceramic composite surface conditioning agent

Abstract

The invention discloses a silane-nanoceramic composite surface conditioning agent. The silane-nanoceramic composite surface conditioning agent is used for surface treatment before metal electrophoresis coating, and 1L of the composite surface conditioning agent comprises 100-100000mg of amino silane or epoxy silane, 1-10000mg of dispersible nanoparticles, 10-50000mg of a zirconium compound or a titanium compound, and the balance of water. The silane-nanoceramic composite surface conditioning agent does not contain phosphorus or other harmful elements, and has pollution to environment in the use process; and compared with present phosphorus-free surface conditioning agents allowing a treated metal to have a thin film on the surface and have poor physical bonding ability with an electrophoresis coating, the silane-nanoceramic composite surface conditioning agent allows a treated metal to have a thick film on the surface in order to enhance the physical binding ability with the electrophoresis coating, so the corrosion resistance and the throwing power of the electrophoresis coated metal are greatly improved.

Description

technical field [0001] The invention relates to a surface treatment agent, in particular to a silane-nanometer ceramic composite surface treatment agent used before metal electrophoretic coating. 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 difficu...

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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

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