CORDIS
EU research results

CORDIS

English EN

Corrosion protection of Aluminium unpainted parts: development of an appropriated Cr free sealing process on thin SAA layer (≤5 µm)

Project information

Grant agreement ID: 307834

Status

Closed project

  • Start date

    1 May 2012

  • End date

    30 April 2014

Funded under:

FP7-JTI

  • Overall budget:

    € 239 981,20

  • EU contribution

    € 179 985

Coordinated by:

CEST KOMPETENZZENTRUM FUR ELEKTROCHEMISCHE OBERFLACHENTECHNOLOGIE GMBH

Austria

Objective

Corrosion of Al has to be counteracted by first anodizing the Al parts and applying further protective coatings. During anodizing, Al reacts with the electrolyte and a layer of aluminium oxide is formed, which is highly porous and is subject to corrosive attack. Therefore, anodized Al is normally further processed with a sealing as a final step. Sealed SAA industrial processes providing thicker layers (~10 µm) are already in the market, but the missing step is to develop a well-suited process for thin layers (≤ 5 µm) that meets the corrosion resistance requirements.
Hot water sealing is one of the widely used methods. However in order to close (seal) the pores in the anodized layer for corrosion protection a process involving boiling water containing chromate is still commonly used. Cr(VI)-based sealing solutions have been used for several decades, but remain one of the most effective and commonly-used methods to improve corrosion resistance of anodized Al. Alternative sealing methods have also been proposed, e.g. with Ni(II), Co(II), Ni(II) + Co(II), rare earth salts, alkali metal fluorides, alkanolamine phosphonates, Cr(III), fatty acids, silicates, etc. It should be noted that Ni(II), Co(II) and fluorides are not without health implications, whereas most organic molecules would be expected to have limited lifetimes under the extreme conditions (UV radiation, low pressure, large temperature range) experience by commercial aircraft during operation. Therefore, of the previously identified approaches Cr(III)-containing or silicate-forming sealing solutions are preferred options. Encouraging results were obtained with deposition of films of CeO2x2 H2O, though the performance still does not equal those of CCC. Characterization with methods such as SEM, EIS, AFM-SECM will lead to more detailed understanding of sealing and corrosion mechanisms and therefore optimizing sealing parameters with respect to corrosion resistance and minimized energy consumption.

Coordinator

CEST KOMPETENZZENTRUM FUR ELEKTROCHEMISCHE OBERFLACHENTECHNOLOGIE GMBH

Address

Viktor Kaplan Strasse 2
2700 Wiener Neustadt

Austria

Activity type

Research Organisations

EU Contribution

€ 179 985

Administrative Contact

Erich Kny (Dr.)

Project information

Grant agreement ID: 307834

Status

Closed project

  • Start date

    1 May 2012

  • End date

    30 April 2014

Funded under:

FP7-JTI

  • Overall budget:

    € 239 981,20

  • EU contribution

    € 179 985

Coordinated by:

CEST KOMPETENZZENTRUM FUR ELEKTROCHEMISCHE OBERFLACHENTECHNOLOGIE GMBH

Austria