How To Keep The Galvanized Pipe Anti-corrosion Paint Film From Falling Off?

Applying anti-corrosion paint on galvanized pipes has always been a very difficult task, because its profile is the same as that of stainless steel, and it is difficult for ordinary paint to adhere to its surface, and the paint film will fall off if you are not careful. Phenomena, how to ensure that the paint film of special profiles such as galvanized pipes is not easy fall will gradually become a problem that people pay more attention to. Next,  the following will briefly describe the paint selection and coating skills of galvanized pipe profiles. Hope that can help you.

There are two commonly used methods for spraying paint on galvanized pipes. One is to perform phosphoric acid treatment on the surface of galvanized pipes, and the other is to use paint with high adhesion. Before painting, the following treatments are required:

1. Phosphating treatment

The so-called phosphoric acid treatment is to use phosphoric acid substances to passivate the surface of galvanized pipe to improve the roughness and adhesion of the surface of galvanized pipe. Phosphating treatment is more troublesome and can be used if conditions permit.

2. Use phosphating primer or high-adhesion primer

Now there is a phosphating primer on the market, which has a similar function to phosphating treatment and can improve the roughness of galvanized pipes to a certain extent. Use phosphating primer and other primers or directly use the center paint finish.

For galvanized pipe profiles, epoxy zinc phosphate primer and epoxy zinc yellow primer are generally used, both of which are primer products with good adhesion, and are widely used in special substrates such as galvanized pipes and stainless steel. , Before painting the galvanized pipe, it needs to be polished, fine grinding is enough to prevent damage to the anti-corrosion layer of the galvanized pipe itself, the treatment of the substrate and the choice of paint are the keys to preventing the anti-corrosion paint of the galvanized pipe from falling factor.