Study on corrosion kinetics of 304 stainless steel by 3.5% NaCl solution

Abstract

The corrosion process of 304 stainless steel was considered to be mainly composed of the diffusion of corrosion solution to the reaction interface through the corrosion layer and the corrosion reaction between corrosion solution and stainless steel at the reaction interface, and and based on this, the dynamic equation of stainless steel corrosion process was established. The corrosion process of 304 stainless steel in 3.5% NaCl solution at 303.15K, 313.15K and 323.15K was analyzed by electrochemical method, and the diffusion coefficient and reaction constant at different temperatures were calculated according to the corrosion experimental results and the established kinetic model. The results showed that the diffusion of corrosion solution through the corrosion layer was the limiting link in the whole stainless steel corrosion process, and the activation energy of chemical reaction between corrosion solution and stainless steel was 28.42KJ/mol .