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Electrodeposition of casein coatings on zinc alloy |
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| Authors: | F Berrekhis Y Roques L Aries M Hajjaji |
| Affiliation: | a Laboratiore de Chimie Physique, Université Cadi Ayade, Faculté des Sciences Semlalia, Marrakech, Morocco b Laboratoire des Matériaux, UPRESA CNRS 5071, Ecole Nationale Supérieure de Chimie, 118 Route de Narbonne, 31077 Toulouse Cedex 4, France |
| Abstract: | The electrochemical behavior of zinc in caseinate solution at pH 10 was investigated. Current–potential curves and weight loss measurements by atomic absorption showed that the anodic dissolution rate of the metal is higher than that obtained in NaOH solution (pH 10). Anodic treatment of zinc alloy at constant potential in such solutions induces the growth of a coating which presents, after drying, strong adherence and a good protection effect in aggressive solution (0.2 M NaCl+0.2 M Na2SO4). IR and ESCA spectrophotometric analysis showed that the zinc ions mainly participated in the growth of a casein coating, probably in a complexed form. |
| Keywords: | Organic coatings Electrodeposition Zinc alloys Casein Protective coatings Electrochemistry Growth (materials) Anodic polarization Corrosion protection Adhesion Substrates Infrared spectroscopy Electron spectroscopy Casein coating Anodic dissolution Electrochemical behavior Atomic absorption |
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