Protection of Mg Alloys against Galvanic and Other Forms of Corrosion
Galvanic corrosion is a particularly important form of corrosion for Mg alloys used in automobiles. Our research work focuses on corrosion protection using cost-effective Cr-free coatings. The top-tanking coatings are found to be effective in preventing general corrosion; some of these coatings are also good for reducing galvanic corrosion and stress corrosion. A practical approach for mitigating galvanic corrosion is to increase the electrolytic resistance between the coated steel and the Mg surfaces. This has been demonstrated in the case of a conversion coating plus a powder coat applied on the surface of a magnesium alloy and in the case of a thin Mylar isolation layer installed between the Mg and the steel surfaces.
W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo
W. Y. Zheng et al., "Protection of Mg Alloys against Galvanic and Other Forms of Corrosion", Materials Science Forum, Vols. 488-489, pp. 787-792, 2005