Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (9): 1302-1310.DOI: 10.1007/s40195-020-01032-0

Previous Articles    

Effect of Metal Cations on Corrosion Behavior and Surface Structure of Carbon Steel in Chloride Ion Atmosphere

Yu-Wei Liu1,2, Jian Zhang3, Xiao Lu1,2, Miao-Ran Liu1,4, Zhen-Yao Wang1()   

  1. 1Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    3Analysis and Testing Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    4University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-10-23 Revised:2019-11-26 Online:2020-09-10 Published:2020-09-17
  • Contact: Zhen-Yao Wang

Abstract:

In order to better understand why the corrosion behavior of carbon steel exposed in Nansha atmospheric environment is very serious, the effect of sodium, potassium and magnesium chlorides deposited on carbon steel surface has been studied under atmosphere conditions by wet/dry accelerated test. The difference of corrosion behavior and surface structure in Na+, K+, and Mg2+ containing atmosphere has been investigated by thickness loss, scanning electron microscope, X-ray diffraction and electrochemical techniques. The results indicate that the thickness loss of carbon steel exposed in different metal cations containing atmospheric environment increases in the order of Na+, K+, Mg2+. The hard metal cation can promote the dissolution of the steel to a certain extent. In Mg2+ containing atmosphere, the relative content of β-FeOOH is rather higher and the protective ability index α*/γ* decreases in the order of Na+, K+, Mg2+. The corrosion current density of both bare carbon steel and the rusted carbon steel increases in the order of Na+, K+, Mg2+. The polarization resistance and the charge transfer resistance decreases in the order of Na+, K+, Mg2+.

Key words: Metal cation, Carbon steel, Chloride, Atmospheric corrosion