钛合金表面硬化与固体润滑处理层的电化学腐蚀行为研究

分别利用等离子氮化技术和离子束增强沉积(IBED)技术使钛合金表面获得硬质抗磨层和MoS2，MoS2-Ti固体润滑膜层。通过电化学测试技术研究了膜层和钛合金基材在含Cl^-介质中的抗蚀性能和接触腐蚀敏感性：研究结果表明：Ti与MoS2的复合改善了MoS2膜的环境适应性，MoS2—17Ti复合膜层与钛合会接触相容；IBED TiN较钛合金电化学活性低，阳极极化行为与Ti6Al4V合金相近，与钛合金基体间电偶腐蚀敏感性低；钛合金等离子氮化处理层在NaCl水溶液中无论处于自然腐蚀电位还上弱阳极极化状态，均较钛合金电化学活性低，且与钛合金基体间电偶腐蚀敏感性低。

Electrochemical Corrosion Behavior of Titanium Alloy Treated by Hardening and Solid Lubricating

Plasma nitriding and ion beam enhanced deposition(IBED) films including TiN hard coating and MoS_2, MoS_2-Ti solid lubricating films were used to treat titanium alloy. The electrochemical corrosion behavior and galvanic corrosion sensitivity of the treated titanium alloy and substrate materials in NaCl solution were studied by using electrochemical measurement methods. The results show that IBED MoS_2-17Ti composite film has better corrosion resistance than that of MoS_2 film only due to the addition of Ti element into the film. It has low galvanic corrosion sensitivity as contacting with titanium alloy. The electrochemical activity of IBED TiN is lower than that of titanium alloy matrix. TiN film is contact compatible with titanium alloy. The corrosion resistance of nitrided titanium alloy is better than that of the bare substrate. The galvanic corrosion sensitivity of nitrided titanium alloy contact with the bare substrate is low in accordance with aeronautic criterion.