Priming is a technique that involves applying zinc phosphate-rich paint to steel to create a corrosion-resistant coat.
Primed finishes and coatings can prevent the steel from rusting by interfering with the formation of anodes, typically seen as rust. When exposed to water, the paint’s compound breaks down into zinc ions (Zn2+) and phosphate ions (PO43-). The phosphate ions make the steel passive by reacting with it, while the zinc ions further inhibit corrosion. For effective protection, the paint should be applied at a thickness of 125 microns, which usually requires two layers. A roller can be used to apply the paint directly onto the steel. Priming efficiently prevents rust, especially for indoor applications, but is less effective in harsh outdoor conditions.
