Study on the corrosion mechanism of the oxide scale on hot rolled steel in an atmospheric environment

Abstract

Purpose The purpose of this paper is to understand the process of failure of scale and the corrosion resistance of scale to the substrate in an atmospheric environment. Design/methodology/approach The corrosion behaviour of X65 pipeline steel with different types of oxide scale was analysed using the natural environment exposure corrosion test, scanning electron microscopy analysis, electrochemical corrosion polarization curve test and other methods in a warehouse environment. Findings The results of this research show that one type of oxide scale, which is rough, has an uneven microstructure, and exhibits weak adhesion to the matrix, does not protect the substrate from corrosion. Conversely, the uniform, dense oxide scale, which exhibits strong adhesion to the matrix, provides effective protection to the steel. However, as the corrosion develops, the corrosion rate of the substrate tends to accelerate, especially when the structure of the oxide scale is damaged to a certain extent. Originality/value The corrosion mechanism of the oxide scale on hot rolled steel in an atmospheric environment has been proposed.

Effect of controlled cooling process on the atmospheric corrosion behaviour of HRB400E hot rolled rebar

“…the distribution of the Si elements can be clearly seen in the diagram as a bright layer at the combination of the iron oxide skin and the collective, i.e. an enrichment of Si oxides occurs here [11], and it was found that there is a continuous thin layer of Fe 2 SiO 4 close to the matrix side.…”