Metallic workpiece pretreatment silane surface treatment agent and preparation method thereof

Abstract

The invention discloses a metallic workpiece pretreatment silane surface treatment agent which is a mixed liquor prepared by the following components based on the weight (gram) in each liter of the mixed liquor: 15-20 parts of A-187 silane coupling agent, 3-4 parts of film-forming material, 7-8 parts of KH-570 silane coupling agent, 3-4 parts of acrylic resin emulsion, 3-5 parts of sodium molybdate, 0.05-0.1 parts of lanthanum nitrate, 0.8-1.2 parts of ethylene glycol, 13-15 parts of propylene glycol, 0.1-0.3 parts of oxalic acid, 2-4 parts of phytic acid, 90-95 parts of methyl alcohol, and the balance of deionized water. The silane coupling agent KH572, ammonium molybdate, propylene glycol, borax, sodium tripolyphosphate and the like are taken as the film-forming materials and reaction raw materials to perform polymerization, form the stronger protective film for the metallic workpiece pretreatment, and strengthen the corrosion resistance of the metallic matrix.

Description

technical field [0001] The invention relates to the field of pretreatment of metal workpieces, in particular to a silane surface treatment agent for pretreatment of metal workpieces and a preparation method thereof. Background technique [0002] In the field of pre-treatment of metal workpieces, although traditional phosphate conversion and chromate passivation surface treatment technologies can achieve good results, the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium and Carcinogens such as nitrite are very serious to environmental pollution, and silanization treatment technology for metal workpiece pretreatment is considered to be expected to replace phosphate conversion treatment and Chromate passivation treatment is the latest development direction of the separate protection of metal workpiece pretreatment. In the existing technology, the film layer formed on the surface of the metal workpiece tre...

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Problems solved by technology

[0002] In the field of pre-treatment of metal workpieces, although traditional phosphate conversion and chromate passivation surface treatment technologies can achieve good results, the exhaust The waste liquid contains zinc, manganese, nickel, chromium and other heavy metal ions and carcinogens such as nitrite, which is very serious to the environment. However, the silanization treatment technology for the pretreatment of metal workpieces does not involve substances that are harmful to the environment, and the production process consumes less energy. , The technology has a wide range of applications, and is considered to be expected to replace phosphate conversion treatment and chromate passivation treatment. It is the latest development direction of the separate protection of metal workpiece pretreatment. In the existing technology, the film formed on the surface of the metal workpiece treated with silane solution , uneven density, voids, cracks, and weak adhesion to metal bodies