对高Ta含量钛合金Ti－32Ta在8 mol／L沸腾硝酸溶液中进行了全浸腐蚀实验，研究了Ti－32Ta合金在沸腾硝酸中的腐蚀行为。采用扫描电子显微镜（ SEM）、 X射线衍射（ XRD）、 X射线衍射光电子能谱（ XPS）等分析方法对钛合金腐蚀表面的钝化膜进行了成分、组织结构及合金价态分析。结果表明： Ti－32Ta合金在沸腾硝酸溶液中呈现均匀腐蚀行为，在介质中通入一定流量的新鲜空气对合金稳定腐蚀阶段的腐蚀速率影响不大。与Ti－6Ta合金相比， Ti－32Ta合金腐蚀后形成的钝化膜更薄更致密，耐蚀性能更好。两种合金腐蚀钝化膜中Ti和Ta的价态组成相同， Ti－32Ta合金腐蚀表面Ta及Ta2 O5的含量高于Ti－6Ta合金腐蚀表面。
The anticorrosion titanium alloy Ti-32Ta was corroded evenly in boiling nitric acid of 8 mol/L, the corrosion behavior in boiling nitric acid has been researched.The chemical composition, structure and valence state of the surface passive film were analyzed by SEM, XRD and XPS.The results show that Ti-32Ta alloy corrosion in boiling nitric acid is a uniform behavior.Little effect is on the corrosion rate of the stable corrosion alloy when the fresh air is pumped into boiling nitric acid.The passive film of Ti-32Ta alloy is thinner, more compact and has better corrosion resistance than Ti-6Ta alloy.The valence state of Ti and Ta in the passive film of two alloys is the same, and the contents of Ta and Ta2 O5 in the Ti-32Ta alloy corrosion surface are higher than in the Ti-6Ta alloy.
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