Weathering steel is a low-alloy steel between ordinary carbon steel and stainless steel. The content of alloy elements in weathering steel is not high, but its performance is very good. Weathering steel is widely used in various places such as railways, landscapes, bridges, etc. .
In the early stages of corrosion, the surface of weathering steel will form a denser rust layer than that of ordinary carbon steel. The corrosion cracks and holes of weathering steel are relatively few. There is no difference in the local delamination phenomenon and corrosion products of carbon steel and weathering steel. Their main difference is the role of alloy elements in the rust layer. Cu and Cr alloy elements are precipitated in the rust layer of weather-resistant steel. The precipitated elements can gather at the cracks of weather-resistant steel to resist the intrusion of water vapor and harmful ions in the atmosphere, preventing further corrosion of weather-resistant steel.
After the surface of weathering steel is corroded, certain methods need to be used to stabilize the rust on the surface. It is necessary to suppress the initial rust from the steel and stabilize the weathering steel. The appearance is similar to ordinary painting, but ordinary painting inhibits rust by blocking the outside air and the surface of the steel, while rust stabilization is It is the stabilization that promotes rust. There is a big difference in function. Because if the coating deteriorates after painting, the paint will peel off, causing rust, and it will have to be repainted to maintain the appearance. However, the rust stabilization treatment method slowly dissolves the film, stabilizes the produced rust, and gradually expands to the entire surface, covering the steel surface with a film and requiring no further maintenance.