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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2019
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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.

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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: 29 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.

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