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The effect of zirconia ions on corrosion performance of sol–gel coated galvanized steel

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Abstract

Currently, galvanized steel is treated with hexavalent chrome passivation. Sol–gel coating has been found to be a potential replacement for the hazardous hexavalent chrome passivation treatment. The aim of this work is to study the effect of zirconyl nitrate on corrosion behavior of sol–gel coating. Aminopropyl-trimethoxysilane and 3-glycidoxypropyltrimethoxysilane were employed as precursors to prepare the sol–gel-based silane coating. The sol–gel film was deposited on galvanized steel sheet by dip coating method. The chemical properties of sol–gel solution and coated films were analyzed by infrared spectroscopy. Morphology of the film was characterized by scanning electron microscope. The corrosion resistance of the coated samples was evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization curve, and salt spray test. The results indicated that zirconia-doped coatings have better corrosion resistance in comparison with their undoped counterparts. The coating doped with 0.5% zirconyl nitrate provides better corrosion protection due to the inhibitive action of zirconia ion.

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Acknowledgments

Authors would like to thank the Management of Tata Steel Limited for permission and encouragement to carry out this work.

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Authors and Affiliations

  1. Research and Development, Tata Steel Ltd., Jamshedpur, 831001, India

    Akshya Kumar Guin, Manish Bhadu & Mohua Sinhababu

  2. Department of Applied Chemistry, Indian School of Mine, Dhanbad, Jharkhand, 826004, India

    G. Udayabhanu

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  1. Akshya Kumar Guin
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  2. Manish Bhadu
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  3. Mohua Sinhababu
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  4. G. Udayabhanu
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Correspondence to Akshya Kumar Guin.

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Guin, A.K., Bhadu, M., Sinhababu, M. et al. The effect of zirconia ions on corrosion performance of sol–gel coated galvanized steel. J Coat Technol Res 11, 967–977 (2014). https://doi.org/10.1007/s11998-014-9602-y

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  • DOI: https://doi.org/10.1007/s11998-014-9602-y

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