The effects of L-cysteine on the inhibition and accelerated dissolution processes of zinc metal. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Corrosion Science Année : 2015

The effects of L-cysteine on the inhibition and accelerated dissolution processes of zinc metal.

Résumé

Effect of l-cysteine on the Zn dissolution in 0.5 M NaCl with initial pH of 4–12 was measured in continuously renewed electrolyte and in immersion tests. At short exposures 1 mM l-cysteine inhibited dissolution. The initial inhibition decreased with pH because of pH-enhanced dimerization of l-cysteine, confirmed by UV–vis spectroscopy. In long exposures at pH = 6–8 the inhibition turned into the acceleration. This was not observed at pH = 12. 10 mM l-cysteine accelerated Zn dissolution. The effects were explained by a competition between strong complexation of l-cysteine with Zn-ions and its weak physisorption on the substrate. The hypothesis was confirmed by surface characterizations.

Domaines

Chimie
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Dates et versions

hal-01276529 , version 1 (19-02-2016)

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Citer

V. Shkirskiya, P. Keilb, H. Hintze-Bruening, F. Leroux, F. Brisset, et al.. The effects of L-cysteine on the inhibition and accelerated dissolution processes of zinc metal.. Corrosion Science, 2015, 100, pp.101-112. ⟨10.1016/j.corsci.2015.07.010⟩. ⟨hal-01276529⟩
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