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采用磁控溅射-微弧氧化复合处理技术,在AZ91D镁合金表面原位合成TiO_2陶瓷层。利用扫描电镜、X射线衍射的方法分析了陶瓷层的形貌特征及物相构成。通过电化学测试、摩擦磨损实验分别研究了陶瓷层的耐蚀性能和耐磨性能。结果表明:陶瓷层表面分布着微米级的微孔,随着氧化时间的延长,微孔的孔径逐渐增大而数量逐渐减少。从截面形貌上可以看出,纯钛膜层的厚度大约为5μm,TiO_2陶瓷层由内层致密层和外层疏松层组成,并且厚度随着氧化时间的延长而增加。陶瓷层主要有金红石型TiO_2相、锐钛矿型TiO_2相及Mg_2SiO_4相构成。TiO_2陶瓷层的自腐蚀电位比基体提高了299 mv,腐蚀电流降低了2个数量级。此外,陶瓷层表现出了一定的减摩作用,综合性能显著提高。
Magnetron sputtering - micro-arc oxidation composite processing technology, AZ91D magnesium alloy surface in situ synthesis of TiO 2 ceramic layer. The morphology and phase composition of the ceramic layer were analyzed by scanning electron microscopy and X-ray diffraction. The corrosion resistance and wear resistance of the ceramic layer were studied by electrochemical tests and friction and wear tests. The results show that the micro-pores are distributed on the surface of ceramic layer. With the extension of oxidation time, the pore size of micro-pores gradually increases and the number decreases. As can be seen from the cross-sectional morphology, the thickness of the pure titanium film is about 5μm, the TiO_2 ceramic layer is composed of the inner dense layer and the outer loose layer, and the thickness increases with the oxidation time. The ceramic layer is mainly composed of rutile TiO 2 phase, anatase TiO 2 phase and Mg 2 SiO 4 phase. The self-corrosion potential of TiO_2 ceramic layer is 299 mv higher than that of the matrix, and the corrosion current is reduced by 2 orders of magnitude. In addition, the ceramic layer showed some anti-friction effect, the overall performance significantly improved.