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Vol. 31 No. 7 (2019): Vol 31 Issue 7

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Corrosion Characteristics of Hydrotalcite and Mg(OH)2 Surfaces of AZ31 Alloy Accomplished via Hydrothermal Surface Modification

https://doi.org/10.14233/ajchem.2019.22007
A. Dhanalakshmi
Department of Chemistry, Alagappa University, Karaikudi-630003, India; Post Graduate and Research Department of Chemistry, Raja Doraisingam Government Arts College, Sivaganga-630561, India
A. Cyril
Post Graduate and Research Department of Chemistry, Raja Doraisingam Government Arts College, Sivaganga-630561, India

Corresponding Author(s) : A. Cyril

cyrilchemistry03@gmail.com

Asian Journal of Chemistry, Vol. 31 No. 7 (2019): Vol 31 Issue 7

Abstract

In this work, the surface of AZ31-Mg alloy is modified by hydrothermal treatment in high alkali solutions to attain high corrosion resistance. A class of magnesium hydroxide family with a layer structured compound hydrotalcite [Mg6Al2CO3(OH)16·4H2O] rhombohedral phase has been formed along with hexagonal Mg(OH)2 phases on AZ31 alloy surface. The hydrotalcite and hexagonal Mg(OH)2 phases were confirmed by X-ray diffraction analysis. The modified surfaces of AZ31 alloy are examined by field emission scanning electron microscope and location specific elemental compositions are obtained by EDS analysis. The hydrotalcite and Mg(OH)2 corrosion behavior was analyzed in 3.5 % NaCl electrolyte. For comparison purpose, only hexagonal Mg(OH)2 surfaces were also prepared by hydrothermal treatment and compared the corrosion rates with the hydrotalcite surfaces. The linear polarization and electrochemical impedance spectroscopy results revealed that the hydrotalcite surfaces demonstrated more noble or positive shift on open circuit potential, corrosion current density and resistance than those of only hexagonal Mg(OH)2 and bare AZ31 alloy. The formation of layered double hydroxide of magnesium with carbonates on AZ31 alloy led the more protection and this work paves newer directions on hydrothermal surface modification of Mg alloys.

Keywords

Corrosion AZ31 magnesium alloy Mg(OH)2 Hydrotalcite
Dhanalakshmi, A., & Cyril, A. (2019). Corrosion Characteristics of Hydrotalcite and Mg(OH)2 Surfaces of AZ31 Alloy Accomplished via Hydrothermal Surface Modification. Asian Journal of Chemistry, 31(7), 1585–1590. https://doi.org/10.14233/ajchem.2019.22007
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