RIBEIRO, ELOANA P.COUTO, ANTONIO A.OLIVEIRA, LEANDRO A. deANTUNES, RENATO A.2020-02-282020-02-282019RIBEIRO, 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. <b>Materials Research</b>, v. 22, p. 1-10, 2019. suppl.1. DOI: <a href="https://dx.doi.org/10.1590/1980-5373-MR-2018-0862">10.1590/1980-5373-MR-2018-0862</a>. DisponÃvel em: http://repositorio.ipen.br/handle/123456789/30837.1516-1439http://repositorio.ipen.br/handle/123456789/30837The 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.1-10openAccessaluminium alloyszinc alloysmagnesium base alloysx-ray photoelectron spectroscopyceriumcoatingsconversioncerium oxidescorrosioncorrosion resistancesurfacesInfluence of the treatment time on the surface chemistry and corrosion behavior of cerium-based conversion coatings on the AZ91D magnesium alloyArtigo de periódico22suppl.110.1590/1980-5373-MR-2018-08620000-0003-1503-158222.13451.50