Improvement of the matching of phosphating film and coating in the pre-treatment process of automobile coating
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Last Update: 2020-02-21
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Source: Internet
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Author: User
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the matching of phosphating film and coating has become a matter of great concernWith the development of coating technology, the matching of phosphating treatment and coating has put forward higher requirementsIn the past, people put too much emphasis on the corrosion resistance of phosphating film itself, while ignoring the matching of phosphating and coatingIn fact, the phospling film itself in the entire coating system does not bear much corrosion resistance, the key is that phosphating film and coating matching is better, which is particularly important for electrophosic coatingIn particular, the current township enterprises have been built or ready to build cathode electrophoresis production line, therefore, improving the phosphating membrane and cathode electrophoresis coating matching has become a new topic of coating enterprise researchimprove the matching method of phosphating membrane and cathode electrophosis coating is to improve the alkalinity of phosphophophosphated film, that is, the higher the resistance to alkaline, the less phosphating membrane in the cathode electrophoresis membrane process dissolves, the higher the quality of cathode electrophoresisThis not only requires phosphatization crystallization to be dense, but also requires a higher P ratio (greater than 85%)To improve P than commonly used manganese-containing zinc phosphatization, ultrasonic phosphatization, phosphating membrane passivation treatment and so on
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