脱合金法在TC4钛合金磁粒研磨光整加工中的应用  

Application of the Dealloying Method to the Grinding and Finishing of TC4 Titanium Alloy Magnetic Particles

作　　者：张祥 马小刚[1] 张亮[2] 杨诗瑞 解志文 ZHANG Xiang;MA Xiaogang;ZHANG Liang;YANG Shirui;XIE Zhiwen(College of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China;Beijing Power Machinery Research Instituted,Beijing 100074,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,鞍山114051 [2]北京动力机械研究所,北京100074

出　　处：《中国表面工程》2023年第2期189-199,共11页China Surface Engineering

基　　金：国家自然科学基金(51775258);辽宁省自然科学基金重点(20170540458);精密与特种加工教育部重点实验室基金(B201703)资助项目。

摘　　要：为解决TC4钛合金表面材料的定量去除问题,提高TC4钛合金磁粒研磨光整加工的效率,采用电化学脱合金法对不同浓度的Na OH溶液进行分析,得出最佳电解液浓度为1.5 mol/L;利用动电位和恒电位极化确定脱合金临界电压为2.1 V。在1.5 mol/L NaOH溶液中,2.1 V电压下进行脱合金试验,TC4钛合金表面获得连续均匀的纳米多孔结构。脱合金3、6、9 h后,工件表面纳米多孔层的维氏硬度分别降低29.4%、39.5%、46.7%。摩擦磨损试验中,磨球穿透纳米多孔层的时间分别为11、21、35 min,纳米多孔层厚度分别达到2.2、3.8和6.2μm。对TC4钛合金和脱合金工件进行磁粒研磨光整加工,研磨加工165 min后,TC4钛合金表面6.2μm厚度的磨痕得到有效去除;研磨加工45 min后,脱合金工件表面6.2μm厚度的纳米多孔层被有效去除,研磨效率提升72.7%。使用脱合金-磁粒研磨复合加工的方法,实现了TC4钛合金表面材料的定量去除,而且降低了表面材料的维氏硬度,提高了磁粒研磨的加工效率。This study attempted to solve the problem of quantitative removal of TC4 titanium alloy surface material and improve the efficiency of the lapping finishing process for TC4 titanium alloy magnetic particles by employing the electrochemical dealloying and magnetic particle lapping methods.The electrochemical dealloying method was used to analyze the corrosion range of the TC4titanium alloy in 0.5,1,and 1.5 mol/L NaOH solutions,and it was determined that when the electrolyte concentration was 1.5mol/L,the corrosion interval was large and the corrosion and dissolution of the Al element was obvious.In electrochemical dealloying experiments,the dealloying behavior was characterized by potentiodynamic and potentiostatic polarization.The range of critical voltage determined by potentiodynamic polarization is 0.5-2.3 V.The influence of the scanning rate was then excluded by potentiostatic polarization,and the accurate critical voltage of dealloying was determined to be 2.1 V.Electrochemical dealloying experiments were conducted on TC4 titanium alloy workpieces in 1.5 mol/L of Na OH solution at 2.1 V.Scanning electron microscopy revealed that a nanoporous structure with large pores and continuous uniformity was prepared on the surface of the TC4titanium alloy after electrochemical dealloying.With the prolongation of the electrochemical dealloying test time,the Al element continued to dissolve rapidly and continuously.The dealloying process penetrated deep into the interior of the TC4 titanium alloy,and the thickness of the nanoporous layer also increased.After electrochemical dealloying of the TC4 titanium alloy for 3,6,and 9 h,the Vickers hardness of the nanoporous layer on the surface was detected by a microhardness tester under the same test conditions.Results showed that,compared with the TC4 titanium alloy,the Vickers hardness of the nanoporous layer on the surfaces of the workpieces after dealloying was reduced by 29.4%,39.5%,and 46.7%,respectively.A friction test using a friction and wear tester was performed on th

关 键 词：TC4钛合金 电化学脱合金 纳米多孔结构 维氏硬度 磁粒研磨 定量去除 

分 类 号：TG176[金属学及工艺—金属表面处理]