The corrosion performance of " electroless" E-coating pre-film on eight different Mg alloys is compared in a 5. wt.% NaCl. The results show that the alloys have different levels of surface alkalization effect, resulting in different thickness of films formed on the alloys. The alloying elements in a Mg alloy do not directly influence the film formation and corrosion performance. Instead, the corrosion resistance of substrate has a significant effect on the degradation or corrosion process of the coated Mg alloy. The corrosion resistance of the substrate Mg alloy can influence the porosity of pre-film during " electroless" E-coating deposition, and it is also a critical factor determining the film corrosion degradation. © 2011 Elsevier Ltd.
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