Article

Journal of Coatings Technology and Research

, Volume 10, Issue 2, pp 277-284

Corrosion behavior of carbon steel coated with magnesium electrodeposited from methyl magnesium chloride solution

  • Samia Ben HassenAffiliated withUnité de Recherche Corrosion & Protection des Métalliques, ENITInstitut UTINAM, CNRS UMR 6213, Université de Franche-Comté Email author 
  • , Latifa BousselmiAffiliated withLaboratoire Traitement et Recyclage des Eaux, CERTE
  • , El Mustafa RezraziAffiliated withInstitut UTINAM, CNRS UMR 6213, Université de Franche-Comté
  • , Patrice BerçotAffiliated withInstitut UTINAM, CNRS UMR 6213, Université de Franche-Comté
  • , Ezzeddine TrikiAffiliated withUnité de Recherche Corrosion & Protection des Métalliques, ENIT

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Abstract

Magnesium coating was electroplated on carbon steel to improve its corrosion protection. The analytical characterization of the magnesium coating was performed by scanning electron spectroscopy and energy dispersive X-ray spectroscopy. The electrochemical behavior of Mg-coated carbon steel was assessed by electrochemical impedance spectroscopy, open-circuit potential measurements and potentiodynamic polarization curves in 0.03% sodium chloride solution. The electrochemical results showed that the self-corrosion current density (i corr) of magnesium-coated steel was 0.32 mA cm−2 (about 1.8% of that of uncoated steel). Impedance results showed an increase of the total impedance when magnesium coating was applied on steel substrate. The corrosion protection was ensured by a two-step mechanism. The first step was cathodic polarization; the second step was the formation of a barrier due to magnesium oxides composed of MgO, Mg(OH2) and Mg(OH3)Cl.

Keywords

Magnesium coating Corrosion Impedance Cathodic protection Barrier protection