On the effects of hydrothermal treatments on the corrosion resistance of the TSA anodized AA7475-T761 alloy
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Key Engineering Materials
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The effect of hydrothermal treatment time on sealing and corrosion resistance of the
AA7475-T761 anodized aluminium alloy has been investigated in this study. The hydrothermal
treatments tested are environmental compatible without chromium ions involved. Anodizing was
carried out by a tartaric-sulphuric anodizing (TSA) process and this was followed by hydrothermal
treatments for partial sealing, in various solutions. The effect of propyleneglycol (PRG) and/or
cerium ions in the hydrothermal treatment solution was evaluated. Four treatment times were tested,
specifically, 2.5, 5.0, 7.5 and 10 min. The corrosion resistance of the anodized and treated samples
was evaluated by Electrochemical Impedance Spectroscopy (EIS) and the anodic layers formed were
characterized by Scanning Electron Microscopy (SEM). The EIS results showed that the
hydrothermal treatments in solutions with cerium ions resulted in similar impedances for periods of
treatment from 5 to 10 min whereas in the solutions with PRG the impedance increased with time of
treatment from 2.5 to 10 min showing a slower kinetics of anodic layer sealing. However, the fastest
kinetics of sealing were associated to the treatments that combined two steps, one in PRG and other
in cerium containing solutions with similar impedances obtained from 2.5 to 10 min of treatment.
Surface evaluation by SEM showed that the porosities in the anodic layer were not sealed for the
periods of hydrothermal treatments corresponding to 2.5 min. The presence of cerium in
hydrothermal treatment had a beneficial effect on the stability of the anodic layer formed and
provided a healing effect on the corroding sites.
Como referenciar
ALMEIDA, THALLIS L.; QUEIROZ, FERNANDA M.; TERADA, MAYSA; COSTA, ISOLDA; CAPELOSSI, VERA R. On the effects of hydrothermal treatments on the corrosion resistance of the TSA anodized AA7475-T761 alloy. Key Engineering Materials, v. 710, p. 169-174, 2016. DOI: 10.4028/www.scientific.net/KEM.710.169. Disponível em: http://repositorio.ipen.br/handle/123456789/27374. Acesso em: 30 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.