硬脂酸改性处理TC4钛合金微弧氧化膜层耐蚀性的研究  

Corrosion resistance of micro-arc oxidation coatings on TC4 titanium alloys modified by stearic acid

作　　者：王伟[1] 赵景茂[1,2] 魏世雄 赵志杰 Muhammad Junaid Anjuma Vahdat Zahedi Asl WANG Wei;ZHAO JingMao;WEI ShiXiong;ZHAO ZhiJie;MUHAMMAD Junaid Anjuma;VAHDAT Zahedi Asl(College of Materials Science and Engineering;Beijing Key Laboratory of Electrochemical Process and Technology for Materials,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学1.材料科学与工程学院 [2]材料科学与工程学院材料电化学过程与技术北京市重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2020年第1期67-74,共8页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(51471021)。

摘　　要：在Ti6Al4V合金微弧氧化膜层上采用硬脂酸改性处理实现了陶瓷膜层的疏水化转变,显著提高了钛合金的耐蚀性能。利用接触角测试仪、扫描电子显微镜(SEM)、能谱仪(EDS)和傅里叶变换红外光谱仪(FT-IR)对膜层的润湿性、稳定性、微观结构和化学组成进行了分析,并通过动电位极化曲线和电化学阻抗分析了其腐蚀行为。结果表明,改性处理得到的疏水微弧氧化膜层试样能有效修复微弧氧化膜层缺陷,提高钛合金的耐蚀性能,说明硬脂酸改性处理与微弧氧化技术相结合有助于拓宽微弧氧化技术在钛合金上的应用。Hydrophobic transformation of the micro-arc oxidation ceramic coating on a Ti 6Al 4V alloy has been achieved by treatment with stearic acid.The wettability,stability,microstructure and chemical composition of the coating were analyzed by contact angle tests,scanning electron microscopy(SEM),energy dispersive spectrometry(EDS)and Fourier transform infrared(FT-IR)spectroscopy.The corrosion behavior of the coating was analyzed by potentio dynamic polarization measurements and electrochemical impedance spectroscopy.The results show that modification with stearic acid can effectively repair defects in the original micro-arc oxidation coating and thus significantly improve the corrosion resistance of the titanium alloy.The results show that such surface modification can broaden the application of micro-arc oxidation technology with titanium alloys.

关 键 词：TI6AL4V合金 微弧氧化 硬脂酸 

分 类 号：TG178[金属学及工艺—金属表面处理]