Development of analytical procedures for the determination of hexavalent chromium in corrosion prevention coatings used in the automotive industry

Analytical and Bioanalytical Chemistry
Fabienne SébyOlivier F X Donard

Abstract

The European directive 2000/53/EC limits the use of Cr(VI) in vehicle manufacturing. Although a maximum of 2 g of Cr(VI) was authorised per vehicle for corrosion prevention coatings of key components, since July 2007 its use has been prohibited except for some particular applications. Therefore, the objective of this work was to develop direct analytical procedures for Cr(VI) determination in the different steel coatings used for screws. Instead of working directly with screws, the optimisation of the procedures was carried out with metallic plates homogeneously coated to improve the data comparability. Extraction of Cr(VI) from the metallic parts was performed by sonication. Two extraction solutions were tested: a direct water extraction solution used in standard protocols and an ammonium/ammonia buffer solution at pH 8.9. The extracts were further analysed for Cr speciation by high-performance liquid chromatography (HPLC) inductively coupled plasma (ICP) atomic emission spectrometry or HPLC ICP mass spectrometry depending on the concentration level. When possible, the coatings were also directly analysed by solid speciation techniques (X-ray photoelectron spectroscopy, XPS, and X-ray absorption near-edge structure, XANES) for...Continue Reading

References

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Citations

Jan 26, 2010·Analytical and Bioanalytical Chemistry·N UncetaO F X Donard
Aug 13, 2013·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry· SarenqiqigeKazuhisa Yoshimura

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