Acta Metall Sin  2012, Vol. 48 Issue (9): 1089-1096    DOI: 10.3724/SP.J.1037.2012.00178

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EFFECTS OF ANTIBACTERIAL AGING TREATMENT ON MICROSTRUCTURE AND PROPERTIES OF COPPER-CONTAINING DUPLEX STAINLESS STEEL II. Corrosion Resistance and Antibacterial Properties

XIANG Hongliang, FAN Jinchun, LIU Dong, GU Xing

School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108

XIANG Hongliang FAN Jinchun LIU Dong GU Xing. EFFECTS OF ANTIBACTERIAL AGING TREATMENT ON MICROSTRUCTURE AND PROPERTIES OF COPPER-CONTAINING DUPLEX STAINLESS STEEL
II. Corrosion Resistance and Antibacterial Properties. Acta Metall Sin, 2012, 48(9): 1089-1096.

Abstract References Related Articles Recommended Metrics Download:  PDF(3030KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Effects of antibacterial aging treatment on the corrosion resistance of copper-bearing duplex stainless steels were investigated by electrochemical methods. The film-cover method was used to test the antibacterial effect of the materials. The polarization curve test results show ε-Cu and other copper-rich phases become the weak point of the passive film on the surface of the duplex stainless steel, and the sites where the coarse copper-rich phases are precipitated from the matrix are apt to become pitting nucleation source. The proportion of coarse copper-rich phase increases, which makes pitting resistance of the materials worse. EIS test reveals that the presence of ε-Cu and other copper-rich phases in passive film reduces the overall potential and passive film resistance, decreasing the stability of passive film. D-EPR tests show that ε-Cu and other copper-rich phases in grain boundary makes it take on anode characteristic in corrosion process, leading to selectively intergranular corrosion. Compared with austenite, the intergranular corrosion resistance of ferrite decreases seriously because the copper-rich phases are mainly precipitated from ferrite matrix. Antibacterial tests show that the microstructure and volume fraction of copper-rich phases are the key factors affecting the antibacterial properties of the materials. ε-Cu displays the best antibacterial effect, followed by metastable copper-rich phase, solid solution copper is the worst. The more ε-Cu phases are, the more antibacterial effect is. Key words:  antibacterial treatment temperature      copper-containing duplex stainless steel      corrosion resistance      antibacterial property      copper-rich phase      Received:  06 April 2012      Fund:  Supported by Program for New Century Excellent Talents in University of Fujian Province (No.JA10014) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors XIANG Hong-Liang FAN Jin-Chun LIU Dong GU Xin URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00178     OR     https://www.ams.org.cn/EN/Y2012/V48/I9/1089 [1] Suzuki S, Nakamura S, Ookubo N, Hasegawa M, Miyakuso K. CAMP–ISIJ, 1999; 12: 518 [2] Chen S H, L¨u M Q, Zhang J D, Dong J S, Yang K. Acta Metall Sin, 2004; 40: 314 (陈四红, 吕曼祺, 张敬党, 董加胜, 杨 柯. 金属学报, 2004; 40: 314) [3] Nan L, Liu Y Q, Yang W C, Xu H, Li Y, Lu M Q, Yang K. Acta Metall Sin, 2007; 43: 1065 (南黎, 刘永前, 杨伟超, 徐慧, 李瑛, 吕曼祺, 杨 柯. 金属学报, 2007; 43: 1065) [4] Zhang Z X, Lin G, Xu Z. 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