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Corrosion Behavior of Anodized and Sol–Gel Duplex Coatings on AA3004

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Abstract

The corrosion protection performances of anodized, sol–gel coated and anodized + sol–gel duplex coated AA 3004 were studied and compared with hydrothermal sealed anodized AA 3004. AA 3004 substrates were anodized using a sulfuric acid bath followed by hydrothermal sealing. A low-temperature curable sol derived from glycidoxypropyl trimethoxy silane and Zr-n-propoxide was deposited on anodized AA3004 and cured at 100 °C for one hour to generate the anodized + sol–gel duplex layer. The sol–gel coating and anodized layer thicknesses were independently varied over a range so as to identify a critical thickness that will yield the best corrosion resistance. Corrosion resistance of only sol–gel coated AA3004 with optimized thickness and those of anodized, anodized + sol–gel duplex coated substrates having an identical thickness were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopic analysis after exposure to 3.5 wt.% NaCl solution. Sol–gel coating was found to act as a better sealant for the anodized layer, when compared to hydrothermal sealing, which was evidenced by the superior corrosion resistance of anodized + duplex coatings when compared to that of the individual layers. A phenomenological mechanism has been proposed to explain the corrosion protection behavior of the coatings investigated.

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Acknowledgements

The authors gratefully acknowledge Director, ARCI for providing constant support throughout the course of this investigation. Authors thank S. Pavithra for technical support during initial stages of this work and Aarti Gautam for her help in fitting the electrochemical impedance spectroscopy data.

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Authors and Affiliations

  1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, Ranga Reddy District, Telangana State, 500 005, India

    K. R. C. Soma Raju, A. Jyothirmayi, L. Rama Krishna & R. Subasri

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  1. K. R. C. Soma Raju
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  2. A. Jyothirmayi
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  3. L. Rama Krishna
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  4. R. Subasri
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Correspondence to K. R. C. Soma Raju.

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Soma Raju, K.R.C., Jyothirmayi, A., Rama Krishna, L. et al. Corrosion Behavior of Anodized and Sol–Gel Duplex Coatings on AA3004. Trans Indian Inst Met 75, 2159–2168 (2022). https://doi.org/10.1007/s12666-022-02595-5

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  • DOI: https://doi.org/10.1007/s12666-022-02595-5

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