resumo
The effect of a post-treatment for short time in 50 mM Ce(NO3)(3) solution, with or without H2O2, on the corrosion of AA2024-T3 anodized in tartaric-sulfuric acid was investigated. Electrochemical (EIS, polarization curves) and corrosion (immersion) tests showed improved performance for samples post-treated at 50 degrees C in the H2O2 con-taining solution. Microstructural characterization (SEM, STEM, GDOES) evidenced the presence of Ce oxy-hydroxides both at the surface and within the pores of the anodized layer, and their preferential interaction with defective sites both at micro and nanoscale. Important amounts of Ce-species were found near corrosion products, indicating active corrosion protection by Ce ions.
palavras-chave
2024-T3 ALUMINUM-ALLOY; ELECTROCHEMICAL-BEHAVIOR; CONVERSION COATINGS; HEXAVALENT CHROMIUM; LOCALIZED CORROSION; FILM FORMATION; AA 2024-T3; OXIDE; DEPOSITION; LAYERS
categoria
Materials Science; Metallurgy & Metallurgical Engineering
autores
Ramirez, OMP; Tunes, MA; Mennucci, MM; Starykevich, M; Neves, C; Ferreira, MGS; Pogatscher, S; De Melo, HG
nossos autores
Maksim Starykevich
Investigador Júnior
Marina Martins Mennucci
Bolseiro de pós-Doutoramento
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)Projectos
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
agradecimentos
HG de Melo is thankful to Fundacao de Amparoa Pesquisa do Estado de Sao Paulo - Brazil (FAPESP) Proc. 2018/01096-5 and Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - Brazil (CNPq) Proc. 400895/2014-5 for the financial support to the project.; This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) - Finance code 001.; MAT acknowledges present research support from the Laboratory Directed Research and Development Program of the Los Alamos National Laboratory - USA under Project no. 20200689PRD2.; C. Neves and M. G. S. Ferreira acknowledge research support from CICECO - Aveiro Institute of Materials, trough project UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/Ministerio da Ciencia, Tecnologia e Ensino Superior - Portugal (MCTES).