Atmospheric corrosion behavior of low-alloy steels in a tropical marine environment
- 23 Downloads
The corrosion behavior of carbon steels and weathering steels was investigated in a tropical marine environment. And both exhibited similar corrosion weight-loss behavior in tropical marine environments. Corrosion weight loss (W) as a function of exposure time (t) can be calculated using the power function, W = Atn. The values of the initial corrosion rate, A, and corrosion tendency, n, can be easily obtained by taking the logarithm of the power equation. However, the corrosion rust-layer structure of the two materials was quite different. The rust layer of carbon steel presents a single-layer structure. Meanwhile, the rust layer of weathering steel exhibits a single-layer structure after exposure for about 24 months and then gradually evolves into a double-layer structure. The main corrosion products of the steels are β-FeOOH, γ-FeOOH, and Fe3O4 in the initial stage of exposure. In the rust layers, α-FeOOH appeared after 12 months of exposure.
KeywordsMarine environment Atmospheric corrosion Carbon steel Weathering steel Rust
This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0304602), the National Basic Research Program of China (973 Program, No. 2014CB643300), and the National Environmental Corrosion Platform (NECP).
- J.J. Wang, X.D. Guo, W.L. Zheng, J.G. Chen, J.S. Wu, Corrosion and Protection 23 (2002) 288–291.Google Scholar
- Q.C. Zhang, J.S. Wu, W.L. Zheng, J.J. Wang, J.G. Chen, A.B. Li, X.F. Yang, Material Protection 34 (2001) No. 4, 4–5.Google Scholar
- Q.C. Zhang, J.J. Wang, J.S. Wu, W.L. Zheng, J.G. Chen, A.B. Li, Acta Metall. Sin. 37 (2001) 193–196.Google Scholar
- M. Yamashita, H. Miyuki, H. Nagano, Sumitomo Search 57 (1995) 12–17.Google Scholar