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为探讨微弧氧化恒压、恒流模式对微弧氧化膜层物相组成、微观结构、耐腐蚀性及单位能耗的影响,利用自制微弧氧化装置在乙酸钙-磷酸盐电解液体系中对TC4钛合金进行微弧氧化处理。采用X射线衍射仪、电化学工作站和扫描电镜等仪器对膜层进行结构表征。结果表明:两种操作模式得到的膜层主要由金红石、锐钛矿及钙磷化合物组成;膜层的耐腐蚀性、单位能耗随着频率的增加而增加;恒流微弧氧化膜层表面有分布均匀、孔径一致的三维连通孔洞,恒压氧化膜层表面孔洞分布不均,孔径不一致。
In order to investigate the effects of constant current and micro-arc oxidation on the phase composition, microstructure, corrosion resistance and energy consumption per unit area of microarc oxidation coatings, a micro-arc oxidation device was used in the system of calcium acetate-phosphate electrolyte TC4 titanium alloy micro-arc oxidation treatment. The structure of the film was characterized by X-ray diffraction, electrochemical workstation and scanning electron microscope. The results show that the films obtained by the two operating modes are mainly composed of rutile, anatase and calcium-phosphorus compounds. The corrosion resistance and unit energy consumption of the films increase with the increase of the frequency. The surface of the coatings There are three-dimensional interconnected holes with uniform distribution and uniform hole diameter. The holes on the surface of the constant-voltage oxide film are unevenly distributed and the diameters are inconsistent.