What Is The Structure Of The Rust Layer?

During the use of weathering steel, corrosion occurs in the initial stage just like ordinary steel, but then the corrosion rate gradually slows down. After a certain period of time, the corrosion almost stops, thereby achieving the purpose of protecting the matrix. This phenomenon is called the rust layer. Stabilization, the rust layer in this state is called stabilized rust layer.
From the perspective of the impact of corrosion products on the corrosion process, atmospheric corrosion of steel is a process in which oxygen in the air undergoes an electrochemical reaction through the rust layer in the presence of a water film. The rust layer is composed of a loose outer rust layer and a dense inner rust layer. The alloying elements in steel mainly work through the influence of the inner rust layer.