ABSTRACT In this work, the corrosion resistance of 316 L-Cu stainless steel (SS) after passivation at different potentials was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The antibacterial property of passivated 316 L-Cu SS was also investigated by plate counting and live-dead cell staining combined with scanning electron microscope (SEM) observation. X-ray photoelectron spectroscope (XPS) was performed to analyse the composition of passive film. The results showed that the corrosion resistance increased with increase of the passivation potential from 600 mV to 750 mV, due to the enhancement of Cr2O3 and Cu(OH)2 contents in passive film. When the passivation potential was increased to 900 mV, Cr(OH)3 in passive film gradually dissolved and transformed to CrO4 2 –, decreasing the stability of passive film. The higher compactness of passive film indicated a declined antibacterial performance.

中文翻译：

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316L-Cu不锈钢在不同模拟体液中的钝化电位调节耐腐蚀性和抗菌性

摘要 在这项工作中，通过动电位极化和电化学阻抗谱 (EIS) 研究了 316 L-Cu 不锈钢 (SS) 在不同电位钝化后的耐腐蚀性。还通过平板计数和活死细胞染色结合扫描电子显微镜（SEM）观察研究了钝化 316 L-Cu SS 的抗菌性能。使用 X 射线光电子能谱仪 (XPS) 分析钝化膜的成分。结果表明，由于钝化膜中Cr2O3和Cu(OH)2含量的增加，随着钝化电位从600 mV增加到750 mV，耐腐蚀性能增加。当钝化电位增加到 900 mV 时，钝化膜中的 Cr(OH)3 逐渐溶解并转化为 CrO4 2 –，降低钝化膜的稳定性。钝化膜的较高致密性表明抗菌性能下降。