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

Metals

Shashi S. Pathak¹  Michael D. Blanton¹  Sharathkumar K. Mendon¹ 

[1] School of Polymers and High Performance Materials, the University of Southern Mississippi, 118 College Drive #5217, Hattiesburg, MS 39406-0001, USA;

关键词: magnesium;    corrosion;    natural weathering;   

DOI  :  10.3390/met4030322

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.