浓硫酸-乙二醇溶液电抛光NiTi合金的工艺与性能  

The process and properties of electro-polishing NiTi alloy in sulfuric acid-ethylene glycol mixed solution

作　　者：何代华[1] 张淼[1] 刘平[1] 刘新宽[1] 刘奉妍 HE Daihua;ZHANG Miao;LIU Ping;LIU Xinkuan;LIU Fengyan(School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200082,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200082

出　　处：《功能材料》2018年第3期3175-3181,共7页Journal of Functional Materials

基　　金：上海市科研计划资助项目(15ZR1428300);中国科学院特种无机涂层重点实验室开放基金资助项目(KLICM-2014-11)

摘　　要：研究了一种可用来抛光NiTi合金的安全稳定的浓硫酸-乙二醇电抛光液体系。通过改变浓硫酸浓度,抛光电压以及抛光温度,分析了不同工艺条件对电抛光试样的微观形貌,表面粗糙度的影响以及电抛光试样与基体试样耐腐蚀能力和支撑力的变化趋势。结果表明,该抛光液体系中最佳的抛光工艺为7 mol/L浓硫酸,10V电压以及20℃,电抛光后试样的最小表面粗糙度(112.9nm)有一定程度降低,耐腐蚀能力有明显提升(形成钝化层),支架支撑力也可以通过电抛光得到有效控制。A safe and stable electro-polished solution containing concentrated sulfuric acid and ethylene glycol was investigated in this paper,which can be used to electro-polish NiTi alloy.The effects of different conditions on the microstructure and surface roughness of the electro-polished samples were investigated by changing the concentration of sulfuric acid,the electro-polishing voltage and temperature.The trend of the corrosion resistance and the radial force about electro-polished samples and the ground samples was investigated as well.The results show that the best electro-polishing condition was7mol/L concentrated sulfuric acid,10V voltage and20℃,respectively,which got the minimum surface roughness(112.9nm)of the electro-polished samples.While the corrosion resistance could be improved obviously after electro-polishing by forming the passivation layer and the radial force was also controlled effectively by electro-polishing.

关 键 词：电抛光 微观形貌 粗糙度 耐腐蚀 支撑力 

分 类 号：TG175.3[金属学及工艺—金属表面处理]