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 railway, landscape, bridge and other places.
At the initial stage of corrosion, the surface of weathering steel will generate a more dense rust layer than that of ordinary carbon steel, and the corrosion cracks and holes of weathering steel are relatively small. There is no difference between local delamination 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 weathering steel, and the precipitated elements can be gathered at the crack of weathering steel. The air can resist the invasion of water vapor and harmful ions in the atmosphere, preventing further corrosion of weathering steel.
After the surface of weathering steel is rusted, certain methods should be used to stabilize the corrosion on its surface. It is necessary to restrain the rust from the initial stage of steel to stabilize the weathering steel, which is similar to the general painting in appearance. However, the general painting is to block the external air and the outside of the steel to inhibit rust, while the rust stabilization is to promote the stabilization of rust. There are great differences in functions. Because if the coating deteriorates after the application of coating, the coating will peel off and rust. In order to maintain the beauty, the coating has to be applied again. However, the rust stabilization treatment method is to slowly melt the coating, so that the rust stabilization produced is gradually expanded to all, and the steel surface is covered with a layer of coating, and no maintenance is needed
