TC1钛合金的腐蚀加工及其对基体性能影响

Corrosion Processing for TC1 Titanium Alloy and Its Effect on Matrix Properties

探讨了TC1钛合金腐蚀加工速度和质量的影响因素,测试了腐蚀加工后TC1钛合金的力学性能。氢氟酸浓度增加,加工速度提高;硝酸浓度较低时,腐蚀溶解占主导地位,浓度较高时,钝化起主要作用,当硝酸与氢氟酸的体积比为2时加工速度达到最大值;钛合金腐蚀加工速率与温度基本呈线性关系,加工时温度控制范围为28~30℃。复配添加剂可降低界面张力,它们的协同效应能够提高过渡区圆角质量、表面光亮度和腐蚀均匀性。腐蚀加工对TC1钛合金拉伸性能影响较小。腐蚀加工后的疲劳性能优于机械加工后的疲劳性能,其疲劳裂纹起源于加工面R圆角根部区域。

The influencing factors of corrosion processing rate and surface quality of TC1 titanium alloy were investigated.The mechanical properties of TC1 titanium alloy after corrosion processing were tested.Processing rate increases with the increasing hydrofluoric acid concentration;When nitric acid concentration is lower,corrosion dissolution dominates,when it is further increased,passivation plays the main role,when the volume ratio of nitric acid to hydrofluoric acid is two,the processing rate reaches the maximum value;corrosion processing rate exhibits linear relationship with the temperature,during corrosion processing,the temperature is controlled in the range of 28-30℃.Combined surfactants can lower the interface tension;their synergistic effect can improve the filleted corner quality of the transition zone,surface finish and corrosion uniformity.Corrosion processing has little effect on tensile property of TC1 titanium alloy.The fatigue property after corrosion processing is superior to that after mechanical processing,fatigue cracks initiate from the root zone of Rfilleted corner of the processed surface.