Abstract
Alternative processes for chromate conversion coatings on zinc represent a research challenge for environmental reasons. A potential concept yielding a promising corrosion behaviour without the need for toxic chemical additives is the application of alternating currents (AC) together with the addition of inorganic nitrogen compounds in an electrochemical bath. A first grazing incidence X-ray diffractometry (GIXD) study of the composition and crystallinity of this novel conversion coating system is presented. GIXD has been employed because this technique has proved to be successful in the analysis of electrochemically formed conversion coatings down to 10 nm thickness. Various ion additives like \(\) and \(\) in NaOH solution were applied in the AC treatment. The nitrite anion, \(\), yielded the best result. It increased the generation rate and crystallinity of the passive layers. The ratio of the crystalline ZnO to Zn(OH)2 content could be influenced by the AC amplitude and the AC cycling time. GIXD decisively contributed to the improved understanding of this chromate-free zinc conversion process.
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