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Protection of Mg Alloys against Galvanic and Other Forms of Corrosion

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Abstract:

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.

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Periodical:

Materials Science Forum (Volumes 488-489)

Pages:

787-792

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.488-489.787

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Online since:

July 2005

Authors:

Wen Yue Zheng, C. Derushie, Jason Lo

Keywords:

AE Alloy, AM 50/60, Automotive, Coating, Compatibility, Conversion Coating, Cyclic Salt-Spray Testing, Galvanic Corrosion, Stress Corrosion, Structural Application

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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