微弧氧化对铝合金搅拌摩擦焊缝耐蚀性能的影响

doi:10.13229/j.cnki.jdxbgxb201602027

摘要/Abstract

摘要： 为了提高搅拌摩擦焊(FSW)焊缝的耐腐蚀性能,本文采用微弧氧化技术在6082系铝合金FSW焊缝表面制备了不同电流密度下的微弧氧化陶瓷膜层,使用X射线衍射仪(XRD)和扫描电镜(SEM)对膜层进行相组成确定并观察其表面形貌,使用激光共聚焦扫描电子显微镜(CLSM)测定膜层表面粗糙度.通过电化学阻抗谱(EIS)及极化曲线(LSV)分析比较微弧氧化前,后铝合金FSW焊缝的耐腐蚀性能.结果表明:随着电流密度的增加,膜层越来越厚,击穿越来越困难.陶瓷层一旦被击穿,会形成很多的熔融物,使陶瓷层表面凹凸不平,表面粗糙度增加.此外,当电流密度为10 A/dm²时,陶瓷膜层表现出较佳的耐蚀性能.

关键词: 材料表面与界面, 铝合金, 焊缝, 微弧氧化, 耐蚀性

Abstract: The ceramic coating fabricated by micro-arc oxidation at different current density is employed to improve the corrosion resistance of Friction Stir Welding (FSW) welds on aluminum alloy. The morphology and phase composition of the coating were investigated by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The surface roughness of the coating was characterized by Confocal Laser Scanning Microscopy (CLSM). The corrosion properties of the FSW welds before and after micro-arc oxidation were analyzed by Electrochemical Impedance Spectroscopy (EIS) and polarization curve (LSV). Results show that the thickness of the ceramic coating layer increases with the current density and it becomes more difficult to break down the coating. Once the coating is broken down a lot of melts will form and the surface roughness increases. Furthermore, the ceramic coating produced at current density of 10 A/m² shows better wear resistance than the others.

Key words: material surface and interface, aluminum alloy, weld, micro-arc oxidation, corrosion resistance

中图分类号:

TG146

杨悦, 周磊磊. 微弧氧化对铝合金搅拌摩擦焊缝耐蚀性能的影响[J]. 吉林大学学报(工学版), 2016, 46(2): 511-515.

YANG Yue, ZHOU Lei-lei. Effect of micro-arc oxidation treatment on corrosion resistance of aluminum friction stir welding welds[J]. 吉林大学学报(工学版), 2016, 46(2): 511-515.

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