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利用双脉冲微弧氧化电源对AZ91D镁合金进行微弧氧化处理,通过检测陶瓷层的厚度和粗糙度,确定了AZ91D镁合金在锆盐电解液中,单极氧化模式和双极氧化模式下的最佳的工艺参数;通过5%NaCl中性盐雾腐蚀试验,对最佳工艺参数下的试样进行陶瓷层耐蚀性检测;利用XRD检测双极试样陶瓷层表面的相成分。试验结果表明:在单脉冲输出形式下,AZ91D镁合金最佳的工艺参数:频率600 Hz,占空比25%;在双脉冲输出形式下,最佳的工艺参数:频率500 Hz,占空比25%,脉冲个数为2∶2;陶瓷膜主要由MgO、Mg2SiO4、MgAl2O4和ZrO2组成。
The AZ91D magnesium alloy was treated by micro-arc oxidation with double pulse micro-arc oxidation power source. The thickness and roughness of the ceramic layer were measured to determine the effect of the AZ91D magnesium alloy in the zirconium salt electrolyte under unipolar oxidation and bipolar oxidation The optimum technological parameters were determined. The corrosion resistance of the ceramic layer was tested by 5% NaCl neutral salt spray corrosion test. The phase composition of the ceramic layer surface was measured by XRD. The experimental results show that the best process parameters of AZ91D magnesium alloy are as follows: the frequency of 600 Hz and the duty ratio of 25% under the form of single-pulse output. Under the double-pulse output, the optimum process parameters are: frequency 500 Hz, duty cycle 25%, the number of pulses is 2: 2; ceramic film is mainly composed of MgO, Mg2SiO4, MgAl2O4 and ZrO2.