Abstract
By utilizing the unique electrochemistry of Mg, a thin organic film can rapidly be deposited on the surface of a Mg alloy by dipping the Mg alloy in a cathodic E-coating bath solution without applying a current or potential. The self-deposited coating is selectively formed on Mg alloy surfaces. Although the “electroless” E-coating pre-film is relatively thin, it can offer sufficient corrosion protection for Mg alloys in a chloride-containing environment. The stability of the film can be significantly improved after curing. The corrosion resistance of the substrate Mg alloy has an important effect on the corrosion protection performance of the coating. The coating is more protective on a corrosion resistant Mg alloy than on a non-corrosion resistant Mg substrate. The coating protection performance is also influenced by the substrate surface condition or pre-treatment process. Wet cleaning + heat-treatment may be a cost-effective surface preparation/treatment for the "electroless" E-coating in industrial applications.
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References
J. Gray, B. Luan, “Protective coatings on magnesium and its alloys—a critical review,” Journal of Alloys and Compounds, 336 (2002), 88–113
C. Blawert, W. Dietzel, E. Ghali, G-L. Song, “Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments,” Advanced Engineering Materials, 8 (2006), 511–533
G-L. Song, “Electroless E-Coating: An Innovative Surface Treatment for Magnesium Alloys,” Electrochemical and Solid-State Letters, 12(10) (2009), D77–D79
G-L. Song, “Electroless deposition of a pre-film of electrophoresis coating and its corrosion resistance on a Mg alloy,” Electrochimica Acta, 55 (2010), 2258–2268
F. Beck, “Fundamental aspects of electrodeposition of paint,” Progress in Organic Coatings, 4 (1976), 1–10
N. Vatistas, “Initial Mechanisms of the Electrocoating Process,” Industrial & Engineering Chemistry Research, 37 (1998), 944–951
E. Okada, H. Hosono, T. Nito, et al., “Development of High Throw power E-coa”, 2005 SAE World Congres, Detroit, SAE Technical Paper #2005–01–0619 (2005)
N. Sato, “Interfacial control between phosphate films and electrodeposition films on coated steels”, SAE technical paper #900838, International Congress and Exposition, Detroit, MI (1990)
G-L. Song, “A dipping E-coating for Mg alloys,” Progress in Organic Coating, 70 (2011), 252–258
G.-L. Song, “The Effect of Mg Alloy Substrate on "Electroless“ E-Coating Performance,” Corrosion Science, 53(2011), 3500–3508
G-L. Song, “Effect of microstructure evolution on corrosion of different crystal surfaces of AZ31 Mg alloy in a chloride containing solution,” Corrosion Science , 54 (2012), 97–105.
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© 2012 TMS (The Minerals, Metals & Materials Society)
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Song, GL. (2012). “Electroless” E-Coating for Magnesium Alloys. In: Mathaudhu, S.N., Sillekens, W.H., Neelameggham, N.R., Hort, N. (eds) Magnesium Technology 2012. Springer, Cham. https://doi.org/10.1007/978-3-319-48203-3_43
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DOI: https://doi.org/10.1007/978-3-319-48203-3_43
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48571-3
Online ISBN: 978-3-319-48203-3
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