The influence of low degree of deformation on the corrosion resistance of pure tantalum in corrosive media

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Refractory Metals & Hard Materials Pub Date : 2024-09-19 DOI:10.1016/j.ijrmhm.2024.106899

Junjun Yuan, Yingjun Wang, Xiao Hou, Jianhui Zhong, Dunqiang Tan

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Abstract

This study investigates the influence of minor deformation on the corrosion resistance of pure tantalum in strongly acidic and alkaline solutions. The electrochemical behavior of samples with varying degrees of deformation was characterized through open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results indicate that in acidic solutions, the corrosion current density and EIS results suggest that low degree deformation reduces the corrosion resistance of tantalum viewed from a kinetic perspective. Conversely, in alkaline solutions, the corrosion potential shifts towards more positive values, but the corrosion current density remains relatively stable, and the electrochemical impedance increases, indicating enhanced corrosion resistance in minor deformed tantalum samples. Analysis reveals that in acidic solutions, the corrosion resistance is primarily affected by the density of geometrically necessary dislocations and the degree of strain, whereas in alkaline solutions, the crystal orientation and grain boundaries are the predominant factors influencing the corrosion resistance.

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低变形度对纯钽在腐蚀性介质中耐腐蚀性的影响

本研究探讨了微小变形对纯钽在强酸性和碱性溶液中耐腐蚀性的影响。通过开路电位、电位极化和电化学阻抗谱分析了不同变形程度样品的电化学行为。结果表明，在酸性溶液中，腐蚀电流密度和电化学阻抗谱结果表明，从动力学角度来看，低度变形会降低钽的耐腐蚀性。相反，在碱性溶液中，腐蚀电位向更正值移动，但腐蚀电流密度保持相对稳定，电化学阻抗增加，表明轻微变形钽样品的耐腐蚀性增强。分析表明，在酸性溶液中，耐腐蚀性主要受几何必要位错密度和应变程度的影响，而在碱性溶液中，晶体取向和晶界是影响耐腐蚀性的主要因素。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.