航空用油介质和NaCl溶液中钛合金电化学特性

采用动电位扫描法研究了Ti-6Al-1.5Cr-2Zr钛合金在3^#煤油和928滑油等高阻值油介质中的电化学极化特性.对于该新型钛合金电极在这2种航空油介质中自腐电位、极化电阻、腐蚀电流等电化学参数和相应的极化规律进行了研究.采用浸泡试验研究了该钛合金在3^#煤油和928滑油中的腐蚀行为.结果表明钛合金在油介质中无明显腐蚀.对钛合金电极在高阻值油介质中电化学特性进行比较,研究了其在3.5%NaCl水溶液中的电化学行为,该钛合金电极在水溶液中的自腐蚀电位为-0.18V,在极化曲线上钝化区为0.27~1.24V,致钝电位为0.23V,致钝电流密度为0.31×10^-4A/cm².

Electrochemical characteristics of titanium alloy in engine oil and NaCl solution

The electrochemical characteristics of a new titanium alloy Ti-6Al-1.5Cr-2Zr in 3^# kerosene and 928 lubricating oil with high resistance were studied by using potentiodynamic polarization. The electrochemical properties including the laws of polarization, open-circuit potential, linear polarization resistance and variation of corrosion current were investigated. The corrosion behaviors of titanium alloy were investigated by using immersion method in 3^# kerosene and 928 lubricating oil. No visible corrosion appeared in the oil medium. The electrochemical characteristics of the alloy in 3.5% NaCl solution were also studied to compare that in the oil medium. The open-circuit potential was -0.18V, passivation potential was 0.23V, passivation current density was 0.31×10^-4A/cm² in 3.5%NaCl solution and the passivation area potential was in the range of 0.27~1.24V in 3.5% NaCl solution.