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  • Why surface treatment is necessary before automobile painting
    新闻分类:Industry information   作者:admin    发布于:2016-06-234    文字:【】【】【

    The surface treatment before automobile coating is very important, which is related to the adhesion and service life of the coating, and directly affects the quality of coating engineering. Therefore, in order to ensure the durability of the coating, meet the use requirements, and give full play to the protection and decoration role of the coating, in addition to the quality of the coating itself, the pretreatment of the metal and non-metallic surface is very important, which must be paid enough attention to. Before coating, the pretreatment of the coated surface is intended to eliminate the dust, oil, water, rust, scale oxide layer and old paint layer on the surface that affect the adhesion between the coating film and the surface to be coated, and reveal the true color of the surface, so that the coating can be well combined with the base metal. The main cause of corrosion is the micro battery formed by the existence of water vapor on the surface of steel and other materials. The specific volume of rust is large and exists between the coating and the surface of the coating, which will reduce the water resistance of the paint film, promote the surface corrosion, clean the surface treatment, remove the rust, improve its water resistance, and extend the service life of the coating. Another purpose of surface treatment is to obtain a smooth surface and a certain degree of roughness, so as to make the coating smooth and beautiful. Prevent the coating from poor drying, blistering, cracking, peeling and other defects.

    There are many methods of surface pretreatment, which should be determined according to the specific conditions such as the use, requirements, construction method and coating variety of the automobile. For example, the common truck, the car and the luxury car have different coating quality, coating type and construction method, so the surface treatment methods are different.

    The procedures of surface pretreatment before coating are as follows: removing oil dirt and rust spots; according to the use requirements, mechanical processing and chemical treatment can also be carried out. The specific pretreatment contents are as follows:

    ① There are two kinds of degreasing treatment: physical mechanical method (wiping method, combustion method, spray method) and physical-chemical method (solvent degreasing method, alkali liquor degreasing method, emulsion degreasing method and electrolytic degreasing method).

    ② There are two kinds of derusting treatment, including physical method (mechanical sand blasting, shot blasting, artificial, sand cloth rust removal, etc.) and chemical method (acid washing method, electrolytic acid washing method, alkali solution derusting method, etc.).

    ③ The main objects of phosphating are: nonferrous metals and their alloys and iron and steel. Chemical oxidation, anodic oxidation (aluminum and aluminum alloy), phosphoric acid method and chromic acid method (zinc and its alloy) are mostly used for nonferrous metals and alloys; phosphoric acid method, chromic acid method and nitric acid method are mostly used for iron and steel.

    The surface pretreatment before automobile coating is an extremely important process. Only by ensuring the quality of surface treatment can the best coating effect be obtained.

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