Effect of surface passivation on corrosion resistance and antibacterial properties of Cu-bearing 316L stainless steel
By Zhao, Jinlong; Xu, Dake; Shahzad, M. Babar; Kang, Qiang; Sun, Ying; Sun, Ziqing; Zhang, Shuyuan; Ren, Ling; Yang, Chunguang; Yang, Ke
Published in Applied Surface Science
NULL
2016
Abstract
Abstract The resistance for pitting corrosion, passive film stability and antibacterial performance of 316L-Cu {SS} passivated by nitric acid solution containing certain concentration of copper sulfate, were studied by electrochemical cyclic polarization, electrochemical impedance spectroscopy (EIS) and co-culture with bacteria. Inductively coupled plasma mass spectrometry (ICP-MS) was used to analyze the Cu2+ ions release from 316L-Cu {SS} surface. {XPS} analysis proved that the enrichment of CuO, Cr2O3 and Cr(OH)3 on the surface of specimen could simultaneously guarantee a better corrosion resistance and stable antibacterial properties. The biocompatibility evaluation determined by {RTCA} assay also indicated that the 316L-Cu {SS} after antibacterial passivation was completely biocompatible.
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