Influence of the treatment time on the surface chemistry and corrosion behavior of cerium-based conversion coatings on the AZ91D magnesium alloy
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Materials Research
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The aim of the present work was to investigate the effect of the treatment time on the surface
chemistry and corrosion behavior of cerium-based chemical conversion coatings on the AZ91D
magnesium alloy. The conversion coating was prepared by the immersion technique from a bath
consisting of 0.05 mol.L-1 Ce(NO3)3.6H2O and 0.254 mol.L-1 H2O2 (30 wt.%) for times ranging from
20 s to 120 s. The surface chemistry was examined by X-ray photoelectron spectroscopy (XPS). The
corrosion behavior was assessed by electrochemical impedance spectroscopy and potentiodynamic
polarization. XPS analysis detected the presence of cerium oxides (Ce2O3 and CeO2) and cerium/
magnesium hydroxides. The best corrosion behavior was observed for the treatment conducted for
60 s. The results are discussed with respect to coating morphology and composition.
Como referenciar
RIBEIRO, ELOANA P.; COUTO, ANTONIO A.; OLIVEIRA, LEANDRO A. de; ANTUNES, RENATO A. Influence of the treatment time on the surface chemistry and corrosion behavior of cerium-based conversion coatings on the AZ91D magnesium alloy. Materials Research, v. 22, p. 1-10, 2019. suppl.1. DOI: 10.1590/1980-5373-MR-2018-0862. Disponível em: http://repositorio.ipen.br/handle/123456789/30837. Acesso em: 30 Dec 2025.
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