酸洗钝化工艺对钛合金氢含量及耐蚀性的影响

摘要

The effects of acid cleaning and passivity technology on the hydrogen content and corrosion resistance of TC4 titanium alloy were discussed in this paper,and the parameters were optimized. The results showed that the hydrogen content in the titanium alloy kept consistent after acid cleaning and passivation treatment,and the increment was below 0.002%. The electrochemical properties were improved due to this treatment,such as the enlarged passivating potential range,the reduced passivating current density, the enhanced transformation potential of passivation films and the increased resistance. The advanced corrosion resistance of TC4 titanium alloy was obtained under the acid cleaning time of 10 ~20min, passivation temperature of 35℃ and passivation time of 60 min.%研究了酸洗钝化工艺对TC4钛合金的氢含量及其电化学性能的影响,并优化了工艺参数.结果表明,经酸洗钝化后的钛合金的氢含量未显著增加,符合氢质量分数增加不大于0.002％的标准；经过酸洗钝化处理的TC4钛合金的电化学性能有了明显提高,维钝电位范围扩大,维钝电流密度减小,钝化膜转化电位提高,阻抗值增大；研究的酸洗钝化工艺,最佳酸洗t为10～20 min,θ为35℃,钝化t为60min,在此工艺参数控制下生成的钝化膜具有较好的耐蚀性.