Effect of Corrosion Temperature on the Corrosion of Q235 Steel and 16Mn Steel in Sodium Aluminate Solutions

Bianli Quan; Junqi Li; Chaoyi Chen

doi:10.1021/acsomega.1c02220

Effect of Corrosion Temperature on the Corrosion of Q235 Steel and 16Mn Steel in Sodium Aluminate Solutions

ACS Omega. 2021 Sep 28;6(40):25904-25915. doi: 10.1021/acsomega.1c02220. eCollection 2021 Oct 12.

Authors

Bianli Quan^{1

2}, Junqi Li^{1

2}, Chaoyi Chen^{1

2}

Affiliations

¹ College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
² Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang 550025, China.

Abstract

This study investigates the effect of corrosion temperature on the corrosion of Q235 steel and 16Mn steel in the sodium aluminate solution using the weight loss method and electrochemical method. The results indicate that the corrosion rates of two steels show an increasing trend with the temperature and that of Q235 steel increases more than that of 16Mn steel at higher temperatures. The corrosion products have changed from four forms at 25 °C to two forms at 65 and 110 °C, namely, the octahedral particles and the bulk particles formed by the flocculent aggregation. The corrosion products are composed of FeS, FeS₂, Fe₂O₃, Fe₃O₄, NaFeO₂, and Al₂O₃. The I _corr of the two steels increases with temperature, while R _p gradually decreases. The two steels are controlled by the charge transfer at 25 and 65 °C and the charge transfer and the ion diffusion at 95 °C, indicating that the temperature changes the kinetics of the corrosion process.