Khan M Saleem, Yang Chunguang, Pan Haobo, Yang Ke, Zhao Ying
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518000, China.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Colloids Surf B Biointerfaces. 2022 Mar;211:112309. doi: 10.1016/j.colsurfb.2021.112309. Epub 2021 Dec 29.
The effects of high temperature aging on the corrosion resistance, mechanical property and antibacterial activity of a copper-bearing 2205 duplex stainless steel (Cu-2205 DSS) were investigated. The results from scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and EDS analysis showed that after aging the proportion of γ phase in microstructure was increased and new σ phase and copper-rich precipitates were formed. The mechanical properties including hardness and tensile and yield strengths of the aged Cu-2205 DSS were significantly enhanced compared to the solution-treated Cu-2205 DSS as well as the 2205 DSS. Electrochemical measurements including electrochemical impedance spectroscopy, potentiodynamic polarization curves and potentiostatic polarization scan were performed to evaluate the corrosion behavior of the Cu-2205 DSS. It was found that aging increased the uniform corrosion resistance but had slightly adverse effect on the pitting corrosion resistance. Additionally, the antibacterial performance of aged Cu-2205 DSS was significantly improved compared to the solution treated Cu-2205 DSS, which was attributed to the more release of copper ions from the matrix that killed the bacteria cells and inhibited the biofilm formation on the surface. The above results suggest that Cu-2205 DSS after high temperature aging revealed good mechanical property, antibacterial performance, and corrosion resistance, which will further expand the application of duplex stainless steel in marine engineering fields.
研究了高温时效对含铜2205双相不锈钢（Cu-2205 DSS）耐腐蚀性、力学性能和抗菌活性的影响。扫描电子显微镜（SEM）、X射线衍射（XRD）、透射电子显微镜（TEM）和能谱分析（EDS）结果表明，时效后微观组织中γ相比例增加，形成了新的σ相和富铜析出相。与固溶处理的Cu-2205 DSS以及2205 DSS相比，时效后的Cu-2205 DSS的硬度、抗拉强度和屈服强度等力学性能显著提高。通过电化学阻抗谱、动电位极化曲线和恒电位极化扫描等电化学测量方法来评估Cu-2205 DSS的腐蚀行为。结果发现，时效提高了均匀耐蚀性，但对点蚀耐蚀性有轻微不利影响。此外，与固溶处理的Cu-2205 DSS相比，时效后的Cu-2205 DSS的抗菌性能显著提高，这归因于基体中更多的铜离子释放，这些铜离子杀死了细菌细胞并抑制了表面生物膜的形成。上述结果表明，高温时效后的Cu-2205 DSS具有良好的力学性能、抗菌性能和耐腐蚀性，这将进一步扩大双相不锈钢在海洋工程领域的应用。
