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Rust layer of weathering steel and its stabilization treatment status |
LIN Peng-fei1, YANG Zhong-min2, CHEN Ying2, LI Zhao-dong2 |
1. College of New Energy and Materials, China University of Petroleum, Beijing 102249, China; 2. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Weathering steel has good atmospheric corrosion resistance,but the formation of stable rust layer is slow. Pretreatment of the surface of weathering steel before use can shorten the formation time of rust layer stabilization and prevent rust liquid from sagging. The development of weathering steel at home and abroad,the formation process of stabilized rust layer and the composition and structure of rust layer are briefly summarized. The rust layer is divided into loose outer rust layer dominated by γ-FeOOH and dense inner rust layer dominated by α-FeOOH. The mechanism of rust layer protection is introduced,including physical barrier,anodic passivation protection,corrosion inhibitor protection and ion selective penetration protection. In order to explore the best use of weathering steel,the current application methods of weathering steel are summarized,which are mainly used after exposed,coated and rust stabilized. The key points of stabilizing treatment for rust layer of weathering steel are put forward,that is,selecting suitable film forming materials and accelerants to promote the formation of α-FeOOH. The application and development direction of stabilization treatment technology in the future are prospected.
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Received: 02 September 2020
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