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Zinc‐coated steel strip is painted in coil‐coating plants in order to improve corrosion resistance and to provide a decorative surface. We have used Auger and x‐ray photoelectron spectroscopy to characterize the conversion coating formed during pretreatment of hot dip zinc‐coated steel prior to coil coating. The pretreatment process includes alkaline cleaning of the strip, alkaline oxidation and a chromic acid after‐rinse treatment. The composition and the chemical state of the surface have been examined after the different pretreatment steps.
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Hörnström et al. (1992) studied this question.
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