TA4微弧氧化陶瓷膜层的结构与性能研究

Structure and properties of ceramic coating on pure titanium TA4 by micro-arc oxidation

利用微弧氧化法在纯钛TA4表面制备以Ti O2为主体富含钙磷的多孔陶瓷膜层。采用扫描电镜、X射线能谱仪、X射线衍射仪、拉曼光谱仪、接触角测量仪及电化学工作站观测与分析陶瓷膜层的微观形貌、元素成分及相组成,探讨微弧氧化对其润湿性及耐蚀性能的影响。结果表明,TA4微弧氧化陶瓷膜层表面粗糙多孔,为锐钛矿相与金红石相Ti O2的混晶结构,金红石相的质量分数约为74.39%。TA4经微弧氧化改性后,表面粗糙度增加了1个数量级,接触角明显下降,表面能提高了87.05%,极性力分量增加了166.07%,体现出更好的润湿性能;自腐蚀电位正移0.53 V,腐蚀电流密度与腐蚀速率均减少了3个数量级,表现出更优的耐腐蚀性能。

The porous oxide TiO2 ceramic coating containing Ca and P is fabricated on the surface of pure titani-um TA4 by micro-arc oxidation (MAO)method.The surface micro-topography,elemental composition,phase components are observed and investigated with scanning electron microscopy(SEM),energy dispersive spec-troscopy (EDS),X-ray diffraction (XRD)and raman spectrometer.The influence of modification on the wet-ting property and corrosion resistance of pure titanium TA4 is analyzed using contact angle meter and electro-chemical workstation.Results indicate that the ceramic coating on pure titanium TA4 by micro-arc oxidation is a porous mixed crystal structure which contains anatase TiO2 and rutile TiO2 ,with the mass fraction of rutile phase being approximately 74.39%,and that after micro-arc oxidation treatment Pure titanium TA4’s surface roughness increases an order of magnitude,its contact angle decreases obviously,surface energy goes up by 87.05% and polar force skyrockets by 166.07%,demonstrating better wetting property,and that self corrosion potential climbs 0.53V in positive direction,and the corrosion current density and corrosion rate reduces three orders of magnitude,exhibiting better corrosion resistance.