Electrochemical Corrosion Behavior of Powder Metallurgy Ti6Al4V Alloy
Electrochemical Corrosion Behavior of Powder Metallurgy Ti6Al4V Alloy
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DOI：
10.1007/s11665-020-05324-5
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发表时间：
2020-11
影响因子：
2.3
通讯作者：
Yang Zhou;Fang Yang;Yanru Shao;Boxin Lu;Tian-xing Lu;Zhimeng Guo
中科院分区：
文献类型：
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作者：
Yang Zhou;Fang Yang;Yanru Shao;Boxin Lu;Tian-xing Lu;Zhimeng Guo
采用动电位极化曲线和交流阻抗谱等电化学方法，研究了不同相对密度(95.2%~99.5%)的粉末冶金Ti6Al4V合金在3.5wt.%氯化钠溶液中的室温腐蚀行为。作为对比，还研究了完全致密化的传统变形Ti6Al4V合金。结果表明，粉末冶金Ti6Al4V合金的耐蚀性能随密度的增加而提高。所有被研究的样品都表现出较低的IP值(在10−6A cm−2数量级)，表明在当前实验条件下具有良好的耐腐蚀性。因此，密度对粉末冶金Ti6Al4V合金的耐蚀性影响不大。值得注意的是，几乎完全致密化的粉末冶金Ti6Al4V合金的耐蚀性和力学性能与变形合金相当。因此，粉末冶金钛合金在海洋应用中具有广阔的应用前景。
The corrosion behavior of powder metallurgy (PM) Ti6Al4V alloys with different relative densities ranged from 95.2 to 99.5% is investigated in 3.5 wt.% NaCl solution at room temperature by electrochemical methods, including potentiodynamic polarization curves and electrochemical impedance spectroscopy. For comparison, traditional wrought Ti6Al4V alloy with full densification is also investigated. The results show that the corrosion resistance of PM Ti6Al4V alloys increases with the increasing density. All the studied samples exhibit low Ipvalues (in the order of 10−6A cm−2), indicating good corrosion resistance under current experimental conditions. Therefore, density effect on the corrosion resistance of PM Ti6Al4V alloys is less significant. It is worth noting that the corrosion resistance and mechanical performance of PM Ti6Al4V alloys with nearly full densification are comparable to those of wrought alloys. Therefore, PM Ti alloys are promising candidates in the marine application.