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Morphological and Microstructural Characterization of the Aragonitic CaCO3/Mg,Al-Hydrotalcite Coating on Mg-9 Wt Pct Al-1 Wt Pct Zn Alloy to Protect against Corrosion

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Abstract

This work presents a novel environmentally clean method for synthesizing the chemical conversion coating on Mg-Al-Zn (AZ91D) alloy surface and protecting the alloy from corrosion. An aragonitic CaCO3/Mg,Al-hydrotalcite two-layer coating was first developed on the Mg alloy in an aqueous Ca2+/HCO3 − solution at 50 °C. When the Mg sample was immersed in a Ca2+/HCO3 − aqueous solution, corrosion occurred on the Mg sample surface, resulting in a high interfacial Mg2+ concentration and high pH value directly above the sample surface. The layer (Mg,Al-hydrotalcite) generated by corrosion formed on the Mg alloy when initially immersed in the Ca2+/HCO3 − solution. Temperature, solution pH, and presence of Mg2+ are important factors when determining the production yield of aragonitic CaCO3 particles. In this work, the high interfacial Mg2+ concentration and high pH directly above the sample surface induced preferential growth of CaCO3 on the Mg,Al-hydrotalcite layer, thereby forming a two-layer coating on the Mg alloy sample. Electrochemical tests using the polarization impedance method and salt spray test show that the CaCO3 coating protected the substrate metal from corrosion. Moreover, the CaCO3 layer markedly improved the galvanic corrosion resistance of the coated Mg alloys.

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Acknowledgments

The authors greatly acknowledge Professor S.K. Yen, Department of Materials Science and Engineering, National Chung Hsing University, and Professor H.H. Huang, School of Dentistry, National Yang-Ming University, for some very important discussions. This study was partly supported by a grant from the Ministry of Education, Republic of China, Taiwan, under the ATU plan.

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Author notes

  1. Bing-Lung Yu (Graduate Student, Engineer)

    Present address: ProMOS Technologies Inc., Taichung, 402, Taiwan, Republic of China

Authors and Affiliations

  1. Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan, Republic of China

    Jun-Yen Uan (Associate Professor), Bing-Lung Yu (Graduate Student, Engineer) & Xin-Liang Pan (Graduate Student)

Authors
  1. Jun-Yen Uan
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  2. Bing-Lung Yu
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  3. Xin-Liang Pan
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Correspondence to Jun-Yen Uan.

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Manuscript submitted March 12, 2008.

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Uan, JY., Yu, BL. & Pan, XL. Morphological and Microstructural Characterization of the Aragonitic CaCO3/Mg,Al-Hydrotalcite Coating on Mg-9 Wt Pct Al-1 Wt Pct Zn Alloy to Protect against Corrosion. Metall Mater Trans A 39, 3233–3245 (2008). https://doi.org/10.1007/s11661-008-9669-0

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