An EXAFS investigation of molybdate-based conversion coatings |
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| Authors: | JA Wharton DH Ross GM Treacy GD Wilcox KR Baldwin |
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| Affiliation: | (1) School of Engineering Sciences, University of Southampton, Highfield, Southampton, Hampshire, SO17 1BJ, Great Britain;(2) IPTME, University of Loughborough, Loughborough, Leicestershire, LE11 3TU, Great Britain |
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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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| Keywords: | chromate-replacement conversion coatings EXAFS molybdate passivation zinc– nickel alloy |
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