Why Does Epoxy Zinc Rich Primer Rust Again?

Epoxy zinc rich primer is a commonly used anti-corrosion paint, whether it is general anti-corrosion or heavy anti-corrosion, it has its presence. However, epoxy zinc rich primer also encounters many problems in construction, and rusting is a relatively serious one after all, as paint is used to prevent rust. Today, let's understand the reasons why epoxy zinc rich primer rusts and the methods to prevent rust.

Zinc content of epoxy zinc rich primer

As an outsider, it is best for everyone to know the standard of epoxy zinc rich primer, which is zinc content of 60/70/80.

However, there are many epoxy zinc rich primers with low zinc content on the market now. Low content is not a problem, after all, some people do not need such high content, but some people sell low content as high content, with high prices and poor anti-corrosion performance.

Resin content of epoxy zinc rich primer

If the epoxy resin content in the paint is low or the content of pigment filler is too high, it will cause poor adhesion and rusting of epoxy zinc rich primer.

Solution: When purchasing, go to the manufacturer and choose paint with appropriate zinc content and resin content.

Construction environment of epoxy zinc rich primer

When painting, the air temperature and humidity have requirements, and epoxy zinc rich primer is no exception. Moreover, epoxy zinc rich primer has high requirements for the base material, which must be dry and flat. If the air humidity is too high, the base material surface will contain moisture, causing rusting after the construction of epoxy zinc rich primer.

Solution: Pay attention to the air humidity during construction. If it exceeds 85%, do not paint.

Substrate treatment of epoxy zinc rich primer

Epoxy zinc rich primer has high requirements for the substrate. If the substrate treatment is not good, the adhesion of the paint will decrease, and when water vapor enters during rainy and snowy weather, rusting phenomenon will occur.

Solution: Before construction, the substrate should be treated and cleaned to level SA2.5.

Film thickness of epoxy zinc rich primer

If the film thickness of epoxy zinc rich primer is too thin, it will also cause rusting.

Solution: According to the specific anti-corrosion requirements, the film thickness should be appropriate. Generally, the film thickness of epoxy zinc rich primer is about 50 um.

Rusting of epoxy zinc rich primer is a relatively serious problem. The main solution here is how to avoid it. If rusting occurs, the rusted part can be re-ground and brushed. If the rusting situation is severe, the entire paint surface needs to be removed and repainted.