1. Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China;2. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The corrosion resistance and corrosion behavior of low alloy steels with different carbon content and different microstructure were investigated, and compared with a commercial weathering steel 09CuPCrNi. At low carbon content,the influence of microstructure on corrosion resistance of steels was not obvious. With higher carbon content, the single phase bainitic steel exhibited higher corrosion resistance than that of multiphase steel constituted by ferrite and cementite (pearlite). No marked distinction could be detected in corrosion resistance of steels with different carbon content water quenched after rolling, however,the steel with low carbon content air cooled after rolling exhibited higher corrosion resistance than that of steel with higher carbon content air cooled too. A compact inner rust layer was formed after 5 test cycles on the specimens with better corrosion resistance as observed by SEM. Though the general corrosion rate of 0.03wt%C water quenched steel was similar to that of 01wt%C water quenched steel, the trend of of pitting development was different. The growth of pitting was ceased after 5 test cycles in 0.03wt%C water quenched steel,but still increasing in the 0.1wt%C water quenched steel.
2008, Vol. 43 
