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

Authors

Shashi S. Pathak, University of Southern Mississippi
Michael D. Blanton, University of Southern MississippiFollow
Sharathkumar K. Mendon, University of Southern MississippiFollow
James W. Rawlins, University of Southern MississippiFollow

Document Type

Article

Publication Date

7-3-2014

Department

Polymers and High Performance Materials

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.

Publication Title

Metals

Volume

4

Issue

3

First Page

322

Last Page

334

Recommended Citation

Pathak, S. S., Blanton, M. D., Mendon, S., Rawlins, J. (2014). Mineralogical Transformation and Electrochemical Nature of Magnesium-Rich Primers During Natural Weathering. Metals, 4(3), 322-334.
Available at: https://aquila.usm.edu/fac_pubs/15405