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Metals 2014, 4(3), 322-334; doi:10.3390/met4030322
Article

Mineralogical Transformation and Electrochemical Nature of Magnesium-Rich Primers during Natural Weathering

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,
 and *
School of Polymers and High Performance Materials, the University of Southern Mississippi, 118 College Drive #5217, Hattiesburg, MS 39406-0001, USA
* Author to whom correspondence should be addressed.
Received: 15 May 2014 / Revised: 14 June 2014 / Accepted: 23 June 2014 / Published: 3 July 2014
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Abstract

Magnesium-rich primers (MgRP) have generated great interest as a promising alternative to chromium-based primers for the protection of aluminum substrates but their performance during exterior exposure has not been well documented. This paper focuses on the evaluation of MgRP during natural weathering to gain insight into its mineralogical phase transformation and electrochemical nature. Control studies were conducted on Mg and AA2024-T3 coupons. The results indicate that Mg particles in MgRP transform into a variety of hydroxide, carbonate, and hydroxy carbonates. During natural weathering, CO2 inhibited the dissolution of both Mg and AA2024-T3 as a result of protective carbonate layer formation in the coating.
Keywords: magnesium; corrosion; natural weathering magnesium; corrosion; natural weathering
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Pathak, S.S.; Blanton, M.D.; Mendon, S.K.; Rawlins, J.W. Mineralogical Transformation and Electrochemical Nature of Magnesium-Rich Primers during Natural Weathering. Metals 2014, 4, 322-334.

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