What are the available methods for derusting steel structures?

For a long time, the fate of rust cannot be rid of naturally in a humid environment. We may only improve the environment of the steel structure but not change it. Then all we can do is take certain measures to remove rust after the steel structure rusts. Today we will take a look at the available rust removal methods for steel structures? Which one is best to use. 1. Change the composition structure of the steel: that is, the alloy elements such as copper and chromium are included in the steel smelting process to improve the rust resistance of the steel. This is stainless steel because the cost is too high, it is difficult to apply a large number of projects. Currently only used for small decorative projects. 2. Spraying on the surface of the steel: the non-metallic protective layer is used to prevent the rust from reaching the steel and the air. This method is convenient to construct and the cost is relatively low, so it is widely used in engineering and has poor single durability. Need to spray again. 3. Pickling and rust removal: Pickling and rust removal is also called chemical rust removal. Its principle is to use the acid in the pickling solution to react with metal oxides to dissolve the metal oxides on the surface of the steel structure and remove the rust on the steel surface And dirt. But pickling can not achieve the surface roughness effect of shot blasting or shot peening. And after pickling to remove rust, a lot of water must be washed and passivated. 4. Sandblasting and derusting: a kind of rust removal method that uses high-pressure air to bring out quartz sand and spray it onto the surface of the steel structure. The sources of quartz sand are river sand, sea sand, and artificial sand. The cost of sand is low and the sources are extensive, but it has great environmental pollution; the rust removal is an entirely manual operation, and the surface roughness of the rusted components is small, which is not easy to meet the requirements of the friction coefficient.