AZ31镁合金与7075铝合金异质金属连接件整体表面防护研究

Study on the overall plasma electrolytic oxidation of the AZ31 magnesium and 7075 aluminum connected parts

由于异种材料属性各异会引起等离子体非平衡反应,导致整体防护膜难以制备。为了研究异质金属整体表面等离子体氧化的方法,根据已有的实验基础,在AZ31镁合金与7075铝合金的连接件表面制备了一层整体的陶瓷膜。通过对3min、7min、10min不同处理时间的连接件样品的分析发现,不同材质的物理、化学活性影响等离子体氧化过程,化学活性高的金属优先发生陶瓷化反应,进而引起陶瓷膜的非平衡生长。AZ31-7075镁-铝异质金属连接件整体表面防护膜的制备,对于丰富氧化膜陶瓷层形成理论和认识多种金属整体微弧氧化过程中非平衡陶瓷层形成过程都具有重要意义。

Non-equilibrium plasma reaction can occur because different materials exhibit different properties;this increases the difficulty associated with the preparation of an overall protective coating.The objective of this experiment is to obtain an overall surface-protecting technology for the magnesium-aluminum connected parts.This study prepares an overall ceramic coating on the surface of the AZ31-7075 connected part based on the existing experimental consideration.Furthermore,deep analysis is applied to the specimens after 3,7,and 10min of treatment.The results denote that the plasma oxidation sequence is related to the physical and chemical activities of different materials.The chemically active metal preferentially undergoes a ceramization reaction,which causes non-equilibrium growth of the ceramic coating.Preparing an overall ceramic coating for AZ31-7075 is of considerable significance to enrich the growth mechanism of the ceramic coating and the imbalanced growth mechanism of the connected parts of dissimilar metals.