Effects of nanoscale chemical heterogeneity on the wear, corrosion, and tribocorrosion resistance of Zr-based thin film metallic glasses
Effects of nanoscale chemical heterogeneity on the wear, corrosion, and tribocorrosion resistance of Zr-based thin film metallic glasses
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DOI：
10.1016/j.surfcoat.2020.126324
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发表时间：
2020-11-25
影响因子：
5.4
通讯作者：
Cai, Wenjun
中科院分区：
文献类型：
--
作者：
Wang, Wenbo;Mraied, Hesham;Cai, Wenjun
纳米级化学异质性对ZrCuNiAl薄膜金属玻璃的耐磨性、耐腐蚀性和耐摩擦腐蚀性的影响通过检查具有相似的全局组成但具有均匀或非均匀局部组成的样品来研究。与均匀样品不同，非均匀样品表现出富Zr的局部组成波动（类似于52.8at.%）。和贫Zr（类似于51.7原子%）区域间隔近似为413.0 +/- 64.7 nm。干划痕磨损研究表明，均匀的样品表现出较低的磨损率和摩擦系数比他们的异质同行，由于其较高的硬度和较低的刚度，从纳米压痕测试测量。通过动电位极化和Mott-Schottky分析，这两种样品的耐腐蚀性进行了研究，在0.6 M的NaCl水溶液中，在室温下。结果发现，异质样品具有更高的耐点蚀性比他们的同质同行形成一个保护钝化层具有较低的缺陷密度。最后，化学不均匀性对两种样品的摩擦腐蚀速率和再钝化动力学的影响进行了讨论，根据它们的机械和电化学性能的差异测量。
The effects of nanoscale chemical heterogeneity on the wear, corrosion, and tribocorrosion resistance of ZrCuNiAl thin film metallic glasses were investigated by examining samples of similar global composition but with either homogenous or heterogeneous local composition. Unlike the homogenous sample, the heterogeneous sample exhibited local compositional fluctuations of Zr-rich (similar to 52.8 at.%) and Zr-lean (similar to 51.7 at.%) regions separated by similar to 413.0 +/- 64.7 nm. Dry scratch wear study showed that the homogenous samples exhibited lower wear rates and friction coefficients than their heterogenous counterparts due to their higher hardness and lower stiffness, as measured from nanoindentation tests. Corrosion resistance of both samples was studied through potentiodynamic polarization and Mott-Schottky analysis in 0.6 M NaCl aqueous solution under room temperature. It was found that the heterogeneous samples exhibited higher pitting resistance than their homogenous counterparts by forming a protective passive layer with lower defect density. Finally, the effects of chemical heterogeneity on the tribocorrosion rate and repassivation kinetics of both samples were discussed based on their differences in mechanical and electrochemical properties measured.