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钛合金Ti-6Al-4V在低电流密度下于NaNO和NaCl溶液中的电化学溶解行为

Titanium Alloy Ti-6Al-4V Electrochemical Dissolution Behavior in NaNO and NaCl Solutions at Low Current Density.

作者信息

Niu Shen, Yu Changyang, Ming Pingmei, Wang Siru, Qin Ge, Li Xinchao, Liu Huan

机构信息

School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China.

出版信息

Materials (Basel). 2024 Oct 14;17(20):5026. doi: 10.3390/ma17205026.

DOI:10.3390/ma17205026
PMID:39459731
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11509600/
Abstract

Jet electrochemical micromilling (JEMM) exhibits significant potential for high-efficiency and high-quality machining of titanium alloy microstructures. However, during the JEMM process, the machined surface of the workpiece inevitably experiences stray current attacks at low current levels. Due to the formation of a dense passive film on the surface of the titanium alloy under electrochemical action, stray corrosion occurs on the machined surface. Hence, the electrochemical dissolution behavior of titanium alloys at low current densities directly impacts both machining efficiency and quality. This study first analyzed the effects of electrolyte composition and current density on the transpassive potential, breakdown of the passive film, current efficiency, and the dissolved surface on Ti-6Al-4V. The transpassive potential and electrochemical impedance of Ti-6Al-4V were found to be lower in NaCl solution than in NaNO solution. In addition, lower current densities enabled higher current efficiency and resulted in a more uniform and flat dissolution surface. Subsequent experiments used these two solutions for JEMM of complex-shaped microstructures on Ti-6Al-4V. The findings demonstrated that, compared to the NaNO solution, the use of NaCl solution increases the material removal rate by approximately 30%, enhances the aspect ratio by about 26%, and reduces surface roughness by roughly 58%. This indicates that employing NaCl solution can lead to superior machining efficiency and quality.

摘要

喷射电化学微铣削（JEMM）在钛合金微结构的高效和高质量加工方面具有巨大潜力。然而，在JEMM过程中，工件的加工表面在低电流水平下不可避免地会受到杂散电流的攻击。由于在电化学作用下钛合金表面形成了致密的钝化膜，加工表面会发生杂散腐蚀。因此，钛合金在低电流密度下的电化学溶解行为直接影响加工效率和质量。本研究首先分析了电解液成分和电流密度对Ti-6Al-4V的过钝化电位、钝化膜击穿、电流效率以及溶解表面的影响。发现Ti-6Al-4V在NaCl溶液中的过钝化电位和电化学阻抗低于在NaNO溶液中的。此外，较低的电流密度能实现更高的电流效率，并产生更均匀、平整的溶解表面。随后的实验使用这两种溶液对Ti-6Al-4V上的复杂形状微结构进行JEMM。结果表明，与NaNO溶液相比，使用NaCl溶液可使材料去除率提高约30%，纵横比提高约26%，表面粗糙度降低约58%。这表明采用NaCl溶液可带来更高的加工效率和质量。

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The State of the Art in Machining Additively Manufactured Titanium Alloy Ti-6Al-4V.
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