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

Journal Article · · Corrosion Science

Here, 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 °C in the H2O2 containing solution. Microstructural characterization (SEM, STEM, GDOES) evidenced the presence of Ce oxyhydroxides 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; Fundaçao de Amparo a Pesquisa do Estado de Sao Paulo; National Council for Scientific and Technological Development (CNPq); Coordenaçao de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Portuguese Foundation for Science and Technology/MCTES
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1869622
Report Number(s):
LA-UR-22-20081
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Vol. 204; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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