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

Author(s)

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

• Document type: Journal article
• Source: Corrosion Science; v. 204, p. 17-pg., 2022-05-24.

Abstract

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)

• FAPESP's process: 18/01096-5 - Corrosion study of the alloy AA2024-T3 anodized in TSA and protected with Ce ions and an hybrid sol-gel coating
• Grantee: Hercílio Gomes de Melo
• Support Opportunities: Regular Research Grants