First, the use of the substrate to improve corrosion resistance, free of hexavalent chromium and trivalent chromium, in line with environmental requirements applicable to the plating of zinc plate, galvanized sheet, galvanized sheet.
Second, product characteristics
1. A yellow transparent liquid containing a chromium-free metal salt and a mineral acid to form a colorless film on the surface of the zinc plate and the aluminum zinc plate. (The phenomenon of discoloration of the passivation liquid occurs during the production process, which is caused by the dissolution of zinc on the strip in the solution and does not affect the performance.)
2, pH: 1.5 ~ 2.5; density: about 1g / cm3
3, has excellent corrosion resistance and high temperature resistance, so that the coated substrate and paint have a good combination.
4, can be used roller coating method, can also be sprayed and squeezed dry, no water washing after coating.
5. Direct coating can obtain a wet film of 6ml/m2, and the dry film thickness after drying is 0.3-0.6g/m2.
Third, the process
1. Degreasing cleaning: In order to ensure the coating effect, the surface of the strip before coating must be free of oil, rust and other foreign matter. If applied directly after galvanizing, the degreasing and water washing steps can be omitted.
2. Washing and drying: After degreasing, it must be thoroughly washed. In order to avoid excessive contamination of the washing tank, the washing tank must overflow and replenish fresh water. The strip surface must be dried before the coating process.
3. Coating: Use a coater or spray squeeze roll to evenly coat the strip surface. The treatment temperature is 5 ° C ~ 40 ° C.
4. Drying and curing: The product has low requirements on the plate temperature, and the plate temperature can be dried at 60-80 °C. The film weight depends on the thickness of the wet film. A suitable dry film weight range is from 0.3 to 0.6 g/m2.
Second, product characteristics
1. A yellow transparent liquid containing a chromium-free metal salt and a mineral acid to form a colorless film on the surface of the zinc plate and the aluminum zinc plate. (The phenomenon of discoloration of the passivation liquid occurs during the production process, which is caused by the dissolution of zinc on the strip in the solution and does not affect the performance.)
2, pH: 1.5 ~ 2.5; density: about 1g / cm3
3, has excellent corrosion resistance and high temperature resistance, so that the coated substrate and paint have a good combination.
4, can be used roller coating method, can also be sprayed and squeezed dry, no water washing after coating.
5. Direct coating can obtain a wet film of 6ml/m2, and the dry film thickness after drying is 0.3-0.6g/m2.
Third, the process
1. Degreasing cleaning: In order to ensure the coating effect, the surface of the strip before coating must be free of oil, rust and other foreign matter. If applied directly after galvanizing, the degreasing and water washing steps can be omitted.
2. Washing and drying: After degreasing, it must be thoroughly washed. In order to avoid excessive contamination of the washing tank, the washing tank must overflow and replenish fresh water. The strip surface must be dried before the coating process.
3. Coating: Use a coater or spray squeeze roll to evenly coat the strip surface. The treatment temperature is 5 ° C ~ 40 ° C.
4. Drying and curing: The product has low requirements on the plate temperature, and the plate temperature can be dried at 60-80 °C. The film weight depends on the thickness of the wet film. A suitable dry film weight range is from 0.3 to 0.6 g/m2.
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