Characterization of chromium (III)-glycine complexes in an acidic medium by UV-visible spectrophotometry and capillary electrophoresis
نویسندگان
چکیده
Abstract Since the 2017 REACH restrictions on hexavalent chromium, aeronautics industries have been seeking substitute processes for chromium plating. So far, use of trivalent chromium-based precursors seems to be best solution in terms process adaptation. The development such requires a better understanding plating bath chemistry. More specifically, there is need characterize complexation mechanisms occurring with (III), since they are responsible higher electrodeposition efficiency. Chromium (III) occurs under specific conditions, as an acidic solution, where hydrolysis takes place, leading stable aqua complex, which suspected detrimental even deposit. To tackle this issue, complexing agent added destabilize hexaaquachromium complex. It reported that ligands glycine allow formation chromium-ligand complexes pH and ratios. In order identify understand various complexes, two characterization methods tested: UV–visible spectrophotometry, allows identification through d-d electronic transition UV–Visible range, capillary electrophoresis separation method, coupled detection quantify each species. spectrophotometry analyses revealed no chromium-glycine complex was observed lower than 2, regular condition electrodeposition. Only Gly:Cr ratio and/or pH>2.4 (i.e pKa1 glycine) made it possible observe solution. As these conditions could met during near substrate/electrolyte interface, highly likely depletion, together increase occurs, favor at being required achieve homogeneous deposits.
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ژورنال
عنوان ژورنال: Results in chemistry
سال: 2021
ISSN: ['2211-7156']
DOI: https://doi.org/10.1016/j.rechem.2021.100207