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The protective effect of Zinc flake coating on steel

Posted on 2018-01-18
Zinc flake coating technology is a new technology, according to the coating divided into dipping drying, spraying, brushing and other methods. Which kind of way in the decision, the first thing to consider is to be covered in the coating on steel drums is focus on the functional and decorative, but also consider the coating thickness control, production speed, product shape and required quality, carefully consider these issues will determine which way the most suitable for you. The summary can be summed up as follows:
1,Barrier effect: as the lamellar zinc and aluminum overlap, it hinders the process of water and oxygen to reach the matrix, and can play an isolation shielding role.
2, Chemical reaction and chromate passivation of zinc, aluminum and metal matrix occurred in the process of Dacromet, passivation film, this produces compact passivation film has good corrosion resistance.
3, Cathodic protection: the main protective effect of zinc, aluminum and chromium coating is the same as galvanized layer, mainly to the substrate for cathodic protection.