Evolution of rust layers on carbon steel and weathering steel in high humidity and heat marine atmospheric corrosion

Yueming Fan¹，Wei Liu¹，Shimin Li¹，Thee Chowwanonthapunya²，Banthukul Wongpat¹，Yonggang Zhao¹，Baojun Dong¹，Tianyi Zhang¹，Xiaogang Li¹

1. Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing2. Faculty of International Maritime Studies, Kasetsart University

摘 要：The evolution of the rust layers on carbon steel and weathering steel in high humidity and heat marine atmospheric environment was investigated by wet/dry cyclic acceleration corrosion tests in this study.The corrosion process of carbon steel and weathering steel was divided into two stages and the reasons for the changes in the corrosion rates of two steels were different. The composition phase of the inner rust layer of weathering steel was mainly goethite, whereas that of carbon steel was mainly akaganeite.Rust resistance(Rr) performed better than charge transfer resistance(Rt) in evaluating the protection performance of rust layer. As the corrosion proceeded, the evolution of the cathodic process of weathering steel was not obvious, whereas that of carbon steel was irregular.

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