Clean cleaning obtained by surface treatment of hardware, so before the surface treatment, the following 5 points should be done to ensure quality.
There are various kinds of oil stains on the surface of the object to be removed. If it is painted before being washed, it will have a harmful effect on the binding force between the coating film and the object to be coated. In severe cases, the film can fall off in pieces. Therefore, the surface of the object to be coated must be carefully removed before painting.
Second, rust removal: remove various oxide scale and rust on the surface of the workpiece.
The corrosion products of metals (rust, scale), welding slag, sand, alkali spots and scale are inorganic dirt. If the above dirt is not removed from the surface of the coating before painting, it will not only affect the adhesion, appearance, and resistance of the coating. Corrosive, and rust continues to spread under the paint film.
3. Phosphating: Phosphating film has porosity. The coating can penetrate into these pores to improve the adhesion of the coating. Phosphating film changes the metal surface from a good conductor to a bad conductor, inhibiting the formation of microbatteries and effectively blocking Coating corrosion.
Fourth, the table tone: accelerate the phosphating rate, refine the phosphating crystals, increase the crystallizing point of phosphating.
Fifth, the construction method of metal spray painting is:
Spraying method: ordinary spraying or electrostatic spraying;
：标准稀释剂； Thinner : standard thinner;
Dilution ratio: paint: thinner = 1: 0.8-1 (mass ratio)
Surface treatment: The work surface must be clean and dry, sanded and flattened or pre-treatment processes such as phosphating
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