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Corrosion resistance of sol–gel alumina coated Mg metal in 3.5 % NaCl solution

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Abstract

This investigation describes the potential of sol–gel derived alumina coating on the corrosion resistance of magnesium metal in 3.5 % NaCl solution. Coating deposition was performed by dip coating technique using boehmite (AlOOH) sol followed by their sintering at 250 °C. EDX and FTIR analysis confirmed that alumina is a main constituent of the coating. Microstructural examination of the coated surface demonstrated amorphous nature of coating of 2–3 µm in thickness. Potentiodynamic polarization and electrochemical impedance measurements indicated a considerable improvement in the corrosion resistance of the coated substrates.

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Acknowledgments

Authors are thankful director, CSIR-AMPRI for providing laboratory facilities. They are also thankful to Mr. A. K. Khare for EDS analysis.

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Authors and Affiliations

  1. Material Characterization Group, CSIR-Advanced Materials and Process Research Institute, Bhopal, 462064, M.P., India

    I. B. Singh, Prasant Gupta, Arpit Maheshwari & Naveen Agrawal

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  1. I. B. Singh
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  2. Prasant Gupta
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  3. Arpit Maheshwari
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  4. Naveen Agrawal
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Correspondence to I. B. Singh.

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Singh, I.B., Gupta, P., Maheshwari, A. et al. Corrosion resistance of sol–gel alumina coated Mg metal in 3.5 % NaCl solution. J Sol-Gel Sci Technol 73, 127–132 (2015). https://doi.org/10.1007/s10971-014-3503-5

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  • DOI: https://doi.org/10.1007/s10971-014-3503-5

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