摘要
研究了Cr、V、Mo、Al等元素对Ti-Ta系合金在6mol/L沸腾硝酸中腐蚀行为的影响规律。通过扫描电子显微镜(SEM)和电化学工作站等分析方法对不同成分合金的腐蚀速率、钝化膜形貌、极化曲线等进行分析。结果表明,单独添加Cr、V、Mo元素对Ti-Ta合金的耐蚀性能影响较小,而添加Al元素会大幅降低合金耐蚀性能;Ti-Ta-Cr合金的腐蚀速率最低,钝化膜致密度最高,稳定性最佳;Ti-Ta-Al合金在腐蚀过程中很难形成致密且稳定的钝化膜。对于Ti-Ta系多元合金,复合添加Cr、V元素有助于获得致密的钝化膜,添加Mo元素会降低钝化膜致密度和稳定性,Al元素添加量为1%(质量分数)时对合金钝化行为的影响不大。提高氧浓度会恶化Ti-Ta-X三元合金在沸腾硝酸中的耐蚀性能。
The influence of elements,such as Cr,V,Mo and Al,on the corrosion behavior of Ti-Ta alloy in 6 mol/L boiling nitric acid was investigated.Corrosion rate,passive film morphology and polarization curve of the alloys with different compositions were analyzed using scanning electron microscopy(SEM)and electrochemical workstation.The results indicate that the addition of Cr,V and Mo elements alone in Ti-Ta alloy has little effect on the corrosion resistance,but the addition of Al element significantly reduces the corrosion resistance.Ti-Ta-Cr alloy exhibits the lowest corrosion rate,highest passive film density and stability.It is difficult for Ti-Ta-Al alloy to form dense and stable passive film during the corrosion process.As for Ti-Ta multicomponent alloys,the co-addition of Cr,V elements helps to form dense passive film,while the addition of Mo element can reduce the density and stability of the passive film.The addition of 1%mass fraction of Al element has little effect on the passivation behavior of the alloy.Increasing oxygen concentration will deteriorate the corrosion resistance of Ti-Ta-X ternary alloy in boiling nitric acid.
作者
吴俊宇
徐建平
刘后龙
李欢
Wu Junyu;Xu Jianping;Liu Houlong;Li Huan(Xi’an Rare Metal Materials Institute Co.,Ltd.,Xi’an 710016,China)
出处
《钛工业进展》
CAS
2023年第4期13-18,共6页
Titanium Industry Progress
基金
国防科技工业核材料技术创新中心项目(ICNM-2022-ZH-18)
国家自然科学基金项目(52203383)
国家自然科学基金项目(12205242)
陕西省创新能力支持计划项目(2023KJXX-095)
陕西省自然科学基金项目(2022JQ-452)
陕西省秦创原项目(QCYRCXM-2022-189)。
关键词
Ti-Ta合金
易钝化元素
耐硝酸腐蚀
电化学
钝化膜
Ti-Ta alloy
easy passivation elements
resistance to nitric acid corrosion
electrochemistry
passive film
