Why is corten metal resistant to corrosion

There are many kinds of steels, and the composition of steels with different qualities is also different. The definition of steel is as follows: steel is a general term for iron-carbon alloys whose carbon content is between 0.02% and 2.11%. At the same time steel will contain manganese, nickel, vanadium and other alloy elements, different uses, different components. In order to solve this problem, corten metal arises at the historic moment.

In the production process of corten metal, after adding trace elements such as phosphorus, copper, chromium and nickel into the steel, the steel surface forms a dense and strong adhesion protective film, which hinders the diffusion and development of rust and protects the matrix under the rust layer to slow down its corrosion rate.

The amorphous spinel oxide layer formed between the rust layer and the matrix is compact and has good adhesion with the matrix metal. Because of the existence of the dense oxide film, oxygen and water in the atmosphere are prevented from infiltrating into the steel matrix, the development of rust to the corten metal is slowed down, and the resistance capacity to atmospheric corrosion of the corten metal is greatly improved.