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采用恒流模式在铝酸盐体系电解液中制备TC4钛合金表面微弧氧化陶瓷层,研究了工作频率对涂层厚度、微观形貌、孔隙率等的影响。结果表明,随频率的增加,相同处理时间所获陶瓷层的厚度呈现先增大后减小的趋势;频率对陶瓷层微观形貌和孔隙率影响相对较大;陶瓷涂层表面分布着大量火山口形态的放电孔洞和微裂纹;在工作频率为500 Hz时,陶瓷层的表面孔径为0.5~1μm,且孔隙率亦仅约为8.41%。
The constant current mode was used to prepare MAO ceramic surface micro-arc oxidation ceramic layer in the electrolyte of aluminate system. The influence of working frequency on the coating thickness, micro-morphology and porosity was studied. The results show that with the increase of the frequency, the thickness of the ceramic layer increases first and then decreases with the increase of the frequency. The influence of frequency on the microstructure and porosity of the ceramic layer is relatively large. A large number of volcanoes are distributed on the surface of the ceramic coating Discharge holes and microcracks. When the operating frequency is 500 Hz, the ceramic layer has a surface pore diameter of 0.5-1 μm and a porosity of only about 8.41%.