材料科学
机械加工
微观结构
钝化
电解质
制作
电火花加工
铌
喷射(流体)
涂层
阳极
冶金
复合材料
图层(电子)
电极
化学
医学
替代医学
物理
物理化学
病理
热力学
作者
Jiajun Lu,Sanjun Liu,Yonghua Zhao
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-09-01
卷期号:170 (9): 093508-093508
被引量:2
标识
DOI:10.1149/1945-7111/acf700
摘要
Analogous to difficult-to-cut materials in mechanical machining, Niobium (Nb) is a difficult-to-dissolve metal by electrochemical machining (ECM) due to its prone-to-passivation nature. Jet-electrochemical discharge machining (Jet-ECDM), which uses anodic discharge rather than the cathodic discharge as in traditional ECDM, has been previously demonstrated as an efficient method for machining inert semiconductors like Si, 4H-SiC. However, applying Jet-ECDM on Nb-like passivating metal is very challenging because plasma electrolytic oxidation (PEO) is very prone to occur in the machining area due to anodic discharges, forming an insoluble, highly stable oxide coating that prevents material removal. This study reveals the principles of overcoming PEO to enable Jet-ECDM on metals. The findings show that the discharge intensity, affected by the electric field and pulse frequency, is decisive in achieving Nb material removal. The electrolyte chemistry significantly influences material removal fashions, depending on the electrolyte’s chemical activity. NaOH is the preferred choice for higher removal efficiency (maximum 1.92 mm min −1 ) and machining localization, while NaCl ensures better surface quality (Sa 99.4 nm). Moreover, the Jet-ECDM generated microstructure surface presents a thin layer of PEO coatings (<1 μ m). This demonstrates the high potential of Jet-ECDM technology for efficient fabrication of coated microstructures in a single-step process.
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