Introduction to pre-treatment of electrophoretic coating

Before we have already introduced the "How to properly manage the electrophoretic coating phosphating process", now the flying paint Xiaobian will introduce the pre-processing from the overview.

In the actual industrial production, in order to get a better coating surface and give full play to the superior performance of electrophoretic coating, the pretreatment must be taken seriously! Although it is common knowledge that people are familiar with, there are still many electrophoresis lines that have not been given enough attention in practice, and various abnormal phenomena have appeared in the workpieces! Doing electrophoresis services has a deep understanding of this - "More than 90% of the problems we deal with are pre-processing problems!" Before we have already introduced the "How to properly manage the electrophoretic coating phosphating process", now the flying paint Xiaobian will introduce the pre-processing from the overview.

Pretreatment and electrophoresis and drying are the three main processes of the coating process, and pre-coating treatment is the basic process, which has an important influence on the quality of the coating film and the service life of the coating film. Its main function is to provide a clean surface; significantly improve the adhesion of the film and the corrosion resistance of the object to be coated, thereby prolonging the service life of the product. A large number of painting practices have proved that the same coatings are used only for different pre-coating methods, and the coatings have a much different corrosion resistance after coating. A workpiece with poor quality or pre-treatment before painting can only be wasted even if the coating used is high-grade.

The pre-processing methods generally have the following types.

Mechanical method: mechanical methods such as sand blasting and shot blasting are often used to purify the metal surface. It is suitable for descaling, descaling and de-welding of various metal castings and thick metal parts. It can also be strengthened by shot blasting. The strength of the metal surface. This method is used in axles, frames, etc.

Chemical method: This is a metal surface pretreatment method that is conducive to the continuous, automated, and widely used electrophoretic coating.

The most basic pretreatment process of chemical treatment is: degreasing → water washing → surface conditioning → phosphating → water washing → pure water washing.

The chemical treatment process is applicable to automobile cabs, car parts, agricultural machinery, wheels, bicycles, sewing machines, refrigerators, washing machines, electric fans, various lamps, building doors and windows, household hardware, metal furniture, toys, etc.

The chemical treatment process should be determined according to the technical requirements of the electrophoretic coating, the structural characteristics of the coated product, and the coating film performance requirements of the coated object. Such as:

For the coating of automobile parts, the corrosion resistance is high, and often there is a complicated internal cavity structure. The phosphating material should be ternary zinc phosphating, and the water washing should be combined with dip-jetting.

For some products that require bending, it is often preferred to choose iron phosphating.

Some products can be pickled, and some products must not be pickled to remove rust.

……and many more.

Controlling the pre-electrophoresis treatment is important for the formation of a uniform phosphating film, otherwise its corrosion resistance is reduced and apparent defects occur after electrophoretic painting. In order to obtain high-quality and uniform phosphating film, in addition to careful operation according to the process, special attention should be paid to the washing process of each step. For the final washing before entering the electrophoresis tank, deionized water should be used to minimize harmful impurities entering the electrophoresis tank and reduce electrophoresis. The effect of coating fluid stability and film quality.

This article comes from: Feiyang Coatings, http://
Http:// Editor: (Hardware Business Network Information Center)

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