摘要
电压加载方式会影响微弧氧化过程及膜层性能。利用自制的具有多种输出脉冲形式的电源,在不同的电压增量下加载对AZ91D镁合金微弧氧化,研究了加载方式对微弧氧化过程及膜层性能的影响。结果表明:随着电压增量的增加,成膜速率增大,膜层粗糙度变大,表面的孔径增大、孔隙率增加;膜层的最终厚度主要取决于终止电压,而终止电压相同时,电压增量越大,平均耗能越小;微弧氧化的不同阶段应采用不同的电压增量,开始阶段将其恒定为10 V/min,当电压达到350 V后改增量为5 V/min直至终止电压,这种加载方式制膜时的成膜效率、能耗及膜层耐蚀性、表面性能等综合结果较好。
A power source with multiple modes of pulse output was used to conduct micro-arc oxidation of AZ91D Mg alloy under voltage-loading with different voltage increments. The effects of voltage-loading modes on the micro-arc oxidation process and corrosion resistance of micro-arc oxidation coating were investigated. Results show that, with the increase of voltage increment, film-forming rate rises, and the roughness, surface pore size, and porosity of the micro-arc oxidation coating increase. The final thickness of the micro-arc oxidation coating is mainly dependent on the terminal voltage. Under a fixed terminal voltage, the average energy consumption declines with increasing voltage increment. It is suggested to adopt different voltage increments at different stages of micro-arc oxidation. Namely, the voltage is set as 10 V/min in the initial stage of micro-arc oxidation, and then it is reduced to 5 V/min at a voltage of 350 V until the terminal voltage is reached. Resultant micro-arc oxidation coating obtained under this voltage-loading mode has desired appearance quality and corrosion resistance; and corresponding film-formation efficiency is high, and energy consumption is low.
出处
《材料保护》
CAS
CSCD
北大核心
2012年第7期12-14,73-74,共3页
Materials Protection
基金
甘肃省重大科技专项(0702GKDA024)
关键词
微弧氧化
电压加载方式
AZ91D镁合金
电压增量
耐蚀性
micro-arc oxidation
voltage-loading mode
AZ91D magnesium alloy
voltage increment
corrosion resistance
