Ce post-treatment for increased corrosion resistance of AA2024-T3 anodized in tartaric-sulfuric acid

Autor(es)

Ramirez, Oscar Mauricio Prada ; Tunes, Matheus Araujo ; Mennucci, Marina Martins ; Starykevich, Maksim ; Neves, Cristina ; Ferreira, Mario G. S. ; Pogatscher, Stefan ; De Melo, Hercilio Gomes

• Tipo de documento: Artigo Científico
• Fonte: Corrosion Science; v. 204, p. 17-pg., 2022-05-24.

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. (AU)

• Processo FAPESP: 18/01096-5 - Estudo da corrosão da liga AA2024-T3 anodizada em TSA e protegida com íons Ce e por revestimento híbrido sol-gel
• Beneficiário: Hercílio Gomes de Melo
• Modalidade de apoio: Auxílio à Pesquisa - Regular