XANES Study of Ce and Mo Containing Conversion Coatings on AluminiumReport as inadecuate




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Abstract : Ce-Mo conversion coatings on superpure aluminium have been examined using XANES and analytical TEM to study the coating development over the electropolished surface. Ce species are predominantly in the Ce3+ state in the coating, resulting from the various steps of the process, and Mo is in the Mo6+ state. After immersion in NaCl solution, Ce and Mo species leach from the coating. Conversion coating formation develops a hydrated film with cerium species incorporated ; final anodic polarisation in MoO42- solution results in Mo species in the hydrated film. Corrosion inhibition is attributed to the coating acting as a barrier layer to environmental access to the aluminium substrate and reduced cathodic activity.





Author: J. Wan G. Thompson T. Ng K. Lu C. Smith

Source: https://hal.archives-ouvertes.fr/



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