AZ91D表面的交流微弧氧化快速成膜

Quick Forming of Coating on AZ91D in AC Micro-Arc Oxidation Surface Treatment

摘要:

采用交流微弧氧化处理技术，在氟化钾+氢氧化钾处理液中，对AZ91D镁合金进行了表面处理研究。建立了膜层厚度与处理参数之间的关系模型，确定膜层的组织构成，讨论膜层生长机理，优化快速成膜技术参数。结果表明：在氟化钾浓度为979 g/L、氢氧化钾浓度为349 g/L、调压器输出电压为81 V、处理液温度为32 ℃的条件下，对工件处理88 s，就可形成30 μm厚的由氟化镁和氧化镁构成的致密表面膜层，该成膜速度较其它处理技术的成膜速度至少提高了7倍

Abstract:

The surface treatment of AZ91D magnesium alloy was carried out in KF+KOH treatment solution using the AC micro-arc oxidation treatment technique. The relationship between coating thickness and treatment parameters was established, the structure of the coating was determined, the growth mechanism of coating was discussed and the treatment parameters for quick forming of coating was optimized. The results show that under the conditions of 979 g/L for concentration of KF, 349 g/L for concentration of KOH, 81 V for voltage and 32 ℃ for the temperature of treatment solution, a 30 μm-thick compact coating which is mainly made up of MgF2 and MgO can be formed on AZ91D magnesium alloy surface after 88 s. This forming speed of the coating is 7 times quicker than that of other treatment techniques at least