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| Effect of Ce on corrosion behavior of duplex stainless steel in NaCl + HCl solution |
| LIU Xiao1, TONG Wei-shuo1, ZHAO Liang-qun1, CHEN Lei2, LIU Liu1 |
1. Jiangsu Metallurgical Technology Research Institute, Jiangsu Jicui Metallurgical Technology Research Institute Co., Ltd., Zhangjiagang 215625, Jiangsu, China;
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract In order to study corrosion resistance of duplex stainless steels in acid NaCl solution, corrosion resistance of UNS S31803 duplex stainless steel containing Ce in NaCl+HCl solution was tested by electrochemical anodic polarization and electrochemical impedance spectroscopy(EIS). The morphological characteristics after corrosion were observed by scanning electron microscope (SEM), the distribution characteristics of alloying elements and impurity elements were detected by electron probe micro-analyzer(EPMA), and the effect mechanism of Ce containing in the duplex stainless steels on the electrochemical corrosion behavior was analyzed. The results indicate that there is selective corrosion of two phases and local pitting corrosion in steel, and ferrite phase suffers more serious pitting corrosion. The results of anodic polarization and EIS are agreed very well, and the passivation range increases because of adding Ce. The corrosion resistance is improved due to the purification of molten steel, the reduction of S and P segregation at the phase boundary and the more uniform distribution of alloy elements such as Cr, Ni and Mo in the two phases by the addition of Ce.
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Received: 14 February 2022
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2022, Vol. 32 
