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An EXAFS investigation of molybdate-based conversion coatings

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Abstract

The composition of molybdate-based conversion coatings on zinc–nickel alloy electrodeposits was examined by extended X-ray absorption fine structure (EXAFS). The absorption spectra from appropriate standards showed distinct differences between the Mo(IV) and Mo(VI) oxidation states. A pre-edge peak was apparent for the various molybdate species and molybdenum trioxide, with the energy and intensity dependent on the coordination of the molybdenum. A shift in the molybdenum K-edge spectra was also evident between Mo(IV) and Mo(VI) compounds. A qualitative analysis revealed that both Mo(IV) and Mo(VI) species were present within the molybdate-based conversion coating, with a significant prevalence of hexavalent molybdenum.

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Authors and Affiliations

  1. School of Engineering Sciences, University of Southampton, Highfield, Southampton, Hampshire, SO17 1BJ, Great Britain

    J.A. Wharton & K.R. Baldwin

  2. IPTME, University of Loughborough, Loughborough, Leicestershire, LE11 3TU, Great Britain

    D.H. Ross, G.M. Treacy & G.D. Wilcox

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  1. J.A. Wharton
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  2. D.H. Ross
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  3. G.M. Treacy
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  4. G.D. Wilcox
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  5. K.R. Baldwin
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Wharton, J., Ross, D., Treacy, G. et al. An EXAFS investigation of molybdate-based conversion coatings. Journal of Applied Electrochemistry 33, 553–561 (2003). https://doi.org/10.1023/A:1024911119051

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