Abnormal relationship between rust particles size and rust layer compactness of weathering steels  

作　　者：Ming ZHANG Shanwu YANG Hua ZHENG Lili CHI Xinlai HE 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Wuhan Iron and Steel (Group) Corporation, Wuhan 430080, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2010年第1期57-62,共6页金属学报（英文版）

基　　金：supported by the National Key Basic Research and Development Program of China (No2004CB619102)

摘　　要：In order to reveal evolution of the rust layer during atmospheric corrosion, commercial weathering steel （WS） 09CuPCrNi and a recently developed bainite WS were subjected to a salt fog test. The protection and compactness of the rust layer were evaluated by electrochemical analysis, absorption-desorption test, etc. The experimental results indicate that more compact rust layer could be derived from the rust particles with larger size. The well-established notion that the rust particle growth can induce the decrement of corrosion resistance of WS. However, the present investigation shows that the notion might not be universally accurate. The unusual result means that the rust particles might grow anisotropically during corrosion.In order to reveal evolution of the rust layer during atmospheric corrosion, commercial weathering steel （WS） 09CuPCrNi and a recently developed bainite WS were subjected to a salt fog test. The protection and compactness of the rust layer were evaluated by electrochemical analysis, absorption-desorption test, etc. The experimental results indicate that more compact rust layer could be derived from the rust particles with larger size. The well-established notion that the rust particle growth can induce the decrement of corrosion resistance of WS. However, the present investigation shows that the notion might not be universally accurate. The unusual result means that the rust particles might grow anisotropically during corrosion.

关 键 词：Weathering steel Corrosion Rust particle COARSENING 

分 类 号：TG142.7[一般工业技术—材料科学与工程] TS235.1[金属学及工艺—金属材料]