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化工学报  2015 

AZ91D镁合金表面不同树脂体系富镁涂层的保护性能

DOI: 10.11949/j.issn.0438-1157.20150542, PP. 4578-4587

Keywords: 腐蚀,电化学,界面,镁合金,涂层

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Abstract:

采用划叉浸泡实验,电化学交流阻抗(electrochemicalimpedancespectroscopy,EIS),开路电位(opencircuitpotential,OCP)及动电位扫描研究了不同类型的环氧树脂对于AZ91D镁合金的表面的富镁涂层的保护性能的影响。结果表明环氧618-593构成的富镁涂层防护性能较差;环氧6101-TY650制备的富镁涂层可明显改善涂层对破损处镁合金基体的保护作用,但涂层本身长期防护性能较差;环氧618-T31构成的富镁涂层对AZ91D镁合金的防护作用较强,适宜制备镁合金表面的富镁涂层。3种环氧涂料中加入镁粉颗粒制备的富镁涂层均可对缺陷处裸露的AZ91D镁合金基体提供保护,从而延长漆膜的破坏时间。涂层中的镁粉颗粒被激活后,为镁合金的基体提供了一定程度的阴极保护作用,减缓了镁合金基体的腐蚀。

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