Can coating be applied after the metal surface is treated in this way? What coating systems can be used?

I see, you want to know whether metal can be painted after surface treatment, and what kind of painting system should be used, right? Firstly, most metal surfaces can be painted after surface treatment; processes such as sandblasting and phosphating can actually improve the adhesion between the coating and the substrate. It is important to ensure that the treated surface is clean, free of any oil residues, loose rust, or dust. The choice of coating system depends on the specific metal substrate and application environment; for example, outdoor industrial steel structures typically use a coating system consisting of an epoxy zinc-rich primer, an epoxy ferrochrome intermediate coat, and a polyurethane topcoat, which offers good rust resistance and weather resistance ； For ordinary steel components used indoors, conventional coating methods such as alkyd enamel are sufficient. However, the choice ultimately depends on your actual operating conditions; it’s best to consult a professional coating supplier in advance or refer to the relevant coating standards for greater certainty.