镁/铝合金表面转化膜在成膜过程中由于存在剧烈的析氢反应以及成膜结束后的失水收缩现象，导致该种转化膜存在结构疏松、连续性差、结合力低等缺点。从转化膜成膜机制角度出发结合3种主要的失效现象(局部损伤、失水收缩致开裂以及结构疏松导致的脱落)，对其失效机理进行详细阐述。同时基于这3种失效机理，简明扼要地介绍目前针对这3个方面所采取的损伤修复、转化膜致密化以及界面结合力增强方面转化膜成膜工艺优化的研究进展，并对转化膜后续发展进行展望。
In the formation process of the conversion film on the surface of magnesium/aluminum alloy, severe hydrogen evolution reaction and water shrinkage at the end of the film formation, which leads to several disadvantages in the conversion coating such as loose structure, poor continuity and low adhesive force. From the perspective of conversion coating film formation mechanism, combining with three kinds of failure phenomenon (partial damage, conversion coating cracking and loose structure), these three failure mechanisms were reviewed. And the progresses of formation process optimization of conversion coating film including self-healing, densification of conversion coating and enhancement of interface binding force were presented briefly. The development trend of conversion coating was also discussed.
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