Shot blasting treatment of weatherproof steel

First, the weatherproof steel is subjected to surface shot blasting treatment, so that the surface roughness of the weatherproof steel is Ra2.50μm-Ra3.50μm. Then the treated weatherproof steel is oxidized at a high temperature of 250℃-350℃ for 1 hour to 4 hours to obtain a dense red-brown oxide layer.

The appearance color of the oxide layer is similar to that of the weatherproof steel after long-time use, and can promote the formation of stable rust layer. This method is simple, low cost, environmental protection, and avoids the environmental pollution caused by the common coating surface stabilization coating method.