Abstract：The evolution of inclusions in steel before and after the cerium treatment was studied by adding different amounts of cerium into the 304 stainless steel. And the effects of inclusion properties on corrosion resistance of 304 stainless steel were analyzed using the corrosion weight loss experiment and electrochemical experiment. MnS inclusions and composite oxide inclusions mainly existed in the stainless steel without cerium, and the average size of inclusions is 8.6 μm, while the self-corrosion potential of steel is only -348.52 mV. After the addition of cerium, the inclusions are gradually modified into spherical or elliptical inclusions, and the average size is reduced, while the corrosion resistance of stainless steel is improved. When the content of cerium reaches 0.012%, the MnS inclusions in steel are all modified into spherical inclusions containing cerium, and the corrosion potential of stainless steel is as high as -311.25 mV, which has the best corrosion resistance. As the content of cerium continues increasing, the shape of the inclusions in steel becomes irregular, and the size of inclusions also increases, resulting in a decrease in the corrosion resistance of the stainless steel.
习小军, 杨树峰, 李京社, 赵梦静, 叶茂林. 含铈304不锈钢夹杂物改性及耐腐蚀性能优化[J]. 钢铁, 2020, 55(1): 20-26.
XI Xiao-jun, YANG Shu-feng, LI Jing-she, ZHAO Meng-jing, YE Mao-lin. Inclusion modification and corrosion resistance optimization of 304 stainless steel containing cerium. Iron and Steel, 2020, 55(1): 20-26.
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2020, Vol. 55 
