TB5钛合金脉冲阳极氧化膜电偶腐蚀性能研究  

Galvanic Corrosion of TB5 Titanium Alloy of Anodic Oxidation Film

作　　者：杨勇进[1] 张晓云[1] 刘明辉[1] 

机构地区：[1]北京航空材料研究院航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《航空材料学报》2015年第5期57-62,共6页Journal of Aeronautical Materials

摘　　要：通过脉冲阳极氧化技术在TB5钛合金表面制备一种抗电偶腐蚀的氧化膜,采用扫描电镜（SEM）和X射线衍射仪分析了钛合金阳极氧化膜的组织形貌和晶体结构,测量了TB5钛合金与钢及铝合金间的电偶腐蚀性能,并采用电化学的方法探讨了钛合金阳极氧化膜的抗电偶腐蚀的机理。结果表明,该氧化膜为厚度约为2~3μm的多孔结构膜,由锐钛型Ti O2晶体和无定型的Ti O2混合组成;电化学分析显示,钛合金阳极氧化后反应电阻增大导致电偶腐蚀电流密度降低;因此,对钛合金进行脉冲阳极氧化处理可以有效降低钛合金电偶触腐蚀敏感性。Anti-galvanic corrosion anodic film was prepared on the surface of TB5 titanium alloy by means of pulse anodizing technology. The morphology,microstructure and chemical composition of the anodic film were studied using scanning electron microscopy（ SEM） and X-ray diffraction（ XRD）. The galvanic corrosion properties of TB5 titanium alloy-aluminum alloys coupling and TB5 titanium alloy-steels coupling were measured. Anti-galvanic corrosion mechanism of the anodic film on titanium alloy surface was also investigated using electrochemical methods. The results showed that the anodic film was composed of anatase Ti O2 and undefined Ti O2.The film was not compact and porous,with a thickness of around 2-3μm. Electrochemical analysis indicated that the reaction resistance of titanium alloy increased after anodizing,leading to decrease of galvanic corrosion current density. Therefore,the galvanic corrosion susceptibility of titanium alloy can be effectively reduced by pulse anodizing treatment.

关 键 词：TB5钛合金 脉冲阳极氧化 电偶腐蚀 电化学 

分 类 号：TG113.231[金属学及工艺—物理冶金]