A comparison between corrosion performances of titanium grade 2 and 7 in strong reducing acids,Materials and Corrosion

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A comparison between corrosion performances of titanium grade 2 and 7 in strong reducing acids
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-03-31 , DOI: 10.1002/maco.202112392
Luca Casanova ₁ , Matteo Gruarin ₁ , MariaPia Pedeferri ₁ , Marco Ormellese ₁

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Titanium has a good corrosion resistance, owing to a thin, compact oxide layer that is formed spontaneously when the metal is exposed to the environment. However, even titanium can be subject to corrosion, for example, when exposed to reducing strong acids. This paper aims to analyze the differences in corrosion resistance of commercially pure titanium (Ti grade 2) and the most resistant Ti–Pd alloy (Ti grade 7, ∼0.2% Pd) in a strong reducing acid environment. Immersion tests, with results collected in the form of corrosion rates, are provided in the first part of the present work. Corrosion morphology is investigated using optical microscopy and laser profilometry. Then, an electrochemical characterization of both metals has been performed by means of cathodic polarization tests, electrochemical impedance spectroscopy, and linear polarization resistance. Weight loss data, electrochemical tests, and corrosion morphology are in good agreement: H₂SO₄, HCl, and oxalic acid are the most aggressive chemicals for commercially pure titanium. In such conditions, the use of Ti grade 7 appears mandatory.

中文翻译：

钛2级和7级在强还原酸中的腐蚀性能比较

钛具有良好的耐腐蚀性，这是由于当金属暴露于环境中时会自发形成薄而致密的氧化层。然而，即使是钛也会受到腐蚀，例如，当暴露于还原性强酸时。本文旨在分析商用纯钛（Ti 等级 2）和最耐腐蚀的 Ti-Pd 合金（Ti 等级 7，~0.2% Pd）在强还原酸环境中的耐腐蚀性差异。本工作的第一部分提供了浸没试验，结果以腐蚀速率的形式收集。使用光学显微镜和激光轮廓测量法研究腐蚀形态。然后，通过阴极极化测试、电化学阻抗谱、和线性极化电阻。失重数据、电化学测试和腐蚀形态非常吻合：H₂ SO ₄、HCl 和草酸是对商业纯钛最具腐蚀性的化学品。在这种情况下，Ti 7 级的使用似乎是强制性的。

更新日期：2021-03-31

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