钛合金材料在醇类溶液中的电化学行为

Electrochemical Behavior of Titanium Alloys in Alcohol Solutions

采用动电位极化测量技术测定了4种航空用钛合金材料(TC4,TC11,TA7和TA12)在6种醇类溶液介质中的极化曲线和它们的电化学参数.重点考察了醇类溶液中H2O或Cl-离子的影响.结果表明:醇类溶液中含一定量的H2O可适当改善材料的耐点蚀性能;而醇类溶液中的Cl-离子将严重损害材料的耐点蚀性能,明显使钛合金材料从自钝化状态转变为活化状态.

Polarization curves and electrochemical parameters of four kinds of titanium alloys (TC4,TC11,TA7 and TA12) were measured in six alcohol solutions with the potentiodynamic method. The effects of H2O and Cl- were mainly investigated. It was found that the pitting corrosion resistance of the alloys was somehow improved when the certain amount of H2O was added in the alcohol solutions and greatly decreased by Cl- in the solutions. Cl- would obviously change titanium alloys from a self-passivation state into an active one.