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 I_p values (in the order of 10⁻⁶ A 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.

通过电化学方法，包括电位动力学极化曲线和电化学阻抗谱，研究了在3.5 wt。％NaCl溶液中室温下，不同相对密度范围为95.2至99.5％的粉末冶金（PM）Ti6Al4V合金的腐蚀行为。为了进行比较，还研究了全致密化的传统可锻Ti6Al4V合金。结果表明，PM Ti6Al4V合金的耐蚀性随密度的增加而增加。所有研究的样品均显示出较低的I _p值（大约为10 ^-6 A cm ^-2），表明在目前的实验条件下具有良好的耐腐蚀性。因此，密度对PM Ti6Al4V合金耐腐蚀性的影响较小。值得注意的是，几乎完全致密化的PM Ti6Al4V合金的耐蚀性和机械性能与锻造合金相当。因此，PM Ti合金是海洋应用中有希望的候选材料。