Aluminum alloys used for aerospace applications provide good strength to weight ratio at a reasonable cost but exhibit only limited corrosion resistance. Therefore, a durable and effective corrosion protection system is required to fulfil structural integrity. Typically, an aerospace corrosion protection system consists of a multi-layered scheme employing an anodic oxide with good barrier properties and a porous surface, a corrosion inhibited organic primer, and an organic topcoat. The present review covers published research on the anodic oxide protection layer principles and requirements for aerospace application, the effect of the anodizing process parameters, as well as the importance of process steps taking place before and after anodizing. Moreover, the challenges of chromic acid anodizing (CAA) substitution are discussed and tartaric-sulfuric acid anodizing (TSA) is especially highlighted among the environmentally friendly alternatives.

https://www.mdpi.com/2079-6412/10/11/1106/pdf

A Review on Anodizing of Aerospace Aluminum Alloys for Corrosion Protection

Corrosion protection of clad 2024 aluminum alloy anodized in tartaric-sulfuric acid bath and protected with hybrid sol–gel coating

Anodic growth of titanium oxide: Electrochemical behaviour and morphological evolution

The behaviour of second phase particles during anodizing of aluminium alloys

The present study investigates the effect of tartaric acid on anodic film morphology and on corrosion resistance of hydrothermally sealed anodized AA2024. Anodizing treatment was performed in dilute sulfuric acid electrolyte with or without addition of tartaric acid. Hydrothermal sealing was carried out in boiling water for each anodized specimen. The morphology of the sealed anodic films was examined using field-emission scanning electron microscopy (FESEM). Electrochemical impedance spectroscopy (EIS) was performed to assess sealing quality and corrosion resistance of the anodic films. It was shown that the sealing was more efficient in the case of anodic films formed in tartaric acid electrolyte mainly due to their lower porosity. It was also observed that the properties of the barrier layer were higher when sealing was performed on specimens anodized in the presence of tartaric acid. This suggests a specific role of the species on the barrier layer, which contributes to the enhancement of the performance in terms of corrosion resistance of the sealed anodic films. The present study clearly validates the beneficial role of tartaric acid in anodizing baths for the corrosion protection of AA2024.

/pdf/fesem-and-eis-study-of-sealed-aa2024-t3-anodized-in-sulfuric-4pl5qbowtd.pdf

FESEM and EIS Study of Sealed AA2024 T3 Anodized in Sulfuric Acid Electrolytes : Influence of Tartaric Acid

Cyclic oxidation processes during anodizing of Al–Cu alloys

Effect of postreatment on the corrosion behaviour of tartaric–sulphuric anodic films

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Cyclic oxidation processes during anodizing of Al–Cu alloys

Effect of postreatment on the corrosion behaviour of tartaric–sulphuric anodic films