School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Mater Sci Eng C Mater Biol Appl. 2017 Feb 1;71:1079-1085. doi: 10.1016/j.msec.2016.11.022. Epub 2016 Nov 9.
The effects of addition of different Cu content (0, 2.5 and 3.5wt%) on mechanical properties, corrosion resistance and antibacterial performance of 316L austenitic stainless steel (SS) after solution and aging treatment were investigated by mechanical test, transmission electron microscope (TEM), X-ray diffraction (XRD), electrochemical corrosion, X-ray photoelectron spectroscopy (XPS) and antibacterial test. The results showed that the Cu addition and heat treatment had no obvious influence on the microstructure with complete austenite features. The yield strength (YS) after solution treatment was almost similar, whereas the aging treatment obviously increased the YS due to formation of tiny Cu-rich precipitates. The pitting and protective potential of the solution treated Cu-bearing 316L SS in 0.9wt% NaCl solution increased with increasing Cu content, while gradually declined after aging, owing to the high density Cu-rich precipitation. The antibacterial test proved that higher Cu content and aging were two compulsory processes to exert good antibacterial performance. The XPS results further indicated that aging enhanced the Cu enrichment in passive film, which could effectively stimulate the Cu ions release from the surface of passive film.
研究了添加不同铜含量（0、2.5 和 3.5wt%）对固溶和时效处理后 316L 奥氏体不锈钢（SS）机械性能、耐腐蚀性和抗菌性能的影响。通过力学性能测试、透射电子显微镜（TEM）、X 射线衍射（XRD）、电化学腐蚀、X 射线光电子能谱（XPS）和抗菌试验对其进行了研究。结果表明，铜的添加和热处理对完全具有奥氏体特征的微观结构没有明显影响。固溶处理后的屈服强度（YS）几乎相同，而时效处理由于形成细小的富铜析出物，明显提高了 YS。在 0.9wt%NaCl 溶液中，固溶处理的含铜 316L SS 的点蚀和保护电位随着铜含量的增加而增加，而时效后则逐渐下降，这是由于富铜沉淀密度较高。抗菌试验证明，较高的铜含量和时效是发挥良好抗菌性能的两个必要过程。XPS 结果进一步表明，时效增强了钝化膜中铜的富集，从而有效地刺激了从钝化膜表面释放铜离子。
