Epoxy zinc rich primer is the most commonly used primer in heavy-duty anti-corrosion coating. The topcoat can be matched with epoxy topcoat, acrylic polyurethane topcoat, fluorocarbon paint, etc.
People who are familiar with paint will find that the price of the same brand of epoxy zinc rich primer is quite different because of the difference in zinc content. Why is it? To clarify this issue, let's first look at the effect of the zinc content in the epoxy zinc rich primer.
The anti-corrosion mechanism of matched primer in paint generally includes shield, isolation, and sacrifice. The role of zinc in epoxy zinc rich primer is to protect the substrate by sacrificing itself. It is known to all that most of substrate for general paint coating is steel, but the chemical properties of zinc are more active than steel. When the corrosive medium in the air reaches the substrate to react with it, the zinc in the paint film firstly reacts with the corrosive medium to form zinc oxide, an inert product attached to the surface of steel, thereby prolonging the anti-corrosion time of the paint. This reaction is called electrochemical reaction. To a certain extent, the higher the zinc content in the epoxy zinc rich primer, the longer this reaction lasts. Therefore, in other words the higher the zinc content, the longer the anti-corrosion time. This is why the higher the zinc content in the epoxy zinc rich primer, the higher the price of it.
At present, the zinc content of the national standard epoxy zinc rich primer is generally about 70%. So the price of this zinc rich primer is relatively high, and it is mostly used in the construction of key projects. In addition, the zinc content refers to the zinc content in the dry film, which should be clarified. To get more information about zinc rich primer, please pay more attention to the latest news of Tianjin Jinhai Special Coatings & Decoration Co., Ltd.