TARTASEAL

Chromate free and energy efficient sealing of TSA anodic films for corrosion protection

Coordinatore	CEST Kompetenzzentrum fur elektrochemische Oberflachentechnologie GmbH    more  Organization address address: Viktor-Kaplan-Strasse 2 city: Wiener Neustadt postcode: 2700 contact info Titolo: Dr. Nome: Erich Cognome: Kny Email: send email Telefono: +43 2622 22266 39 Fax: +43 2622 22266 50
Nazionalità Coordinatore	Austria [AT]
Totale costo	100˙000 €
EC contributo	75˙000 €
Programma	FP7-JTI Specific Programme "Cooperation": Joint Technology Initiatives
Code Call	SP1-JTI-CS-2011-01
Funding Scheme	JTI-CS
Anno di inizio	2011
Periodo (anno-mese-giorno)	2011-12-01   -   2012-11-30

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	CEST Kompetenzzentrum fur elektrochemische Oberflachentechnologie GmbH  Organization address address: Viktor-Kaplan-Strasse 2 city: Wiener Neustadt postcode: 2700 contact info Titolo: Dr. Nome: Erich Cognome: Kny Email: send email Telefono: +43 2622 22266 39 Fax: +43 2622 22266 50	AT (Wiener Neustadt)	coordinator	75˙000.00

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 Obiettivo del progetto (Objective)

'Corrosion of Al has to be counteracted by first anodizing the Al parts and applying further protective coatings. During anodizing, aluminium reacts with the electrolyte and a layer of aluminium oxide is formed on the surface of the aluminium specimen. This coating is highly porous and is subject to attack from the environment and corrosive elements. Therefore, anodized aluminium is normally further processed with a sealing as a final step after anodizing. A hot water sealing process is one of the widely used methods. However in order to close (seal) the pores in the aluminium oxide anodized layer for corrosion protection a process involving boiling water containing chromate is still commonly used. Cr(VI)-based sealing solutions have been employed for several decades, but remain one of the most effective and commonly-used methods to improve corrosion resistance of anodized aluminium. Alternative sealing methods have also been proposed for example with Ni(II), Co(II), Ni(II) and Co(II), rare earth salts, alkali metal fluorides, alkanolamine salts of phosphonic acids, Cr(III), fatty acids, silicates, etc. Already about 45 of the 92 naturally occurring elements have been considered as replacements for Cr(VI) in conversion coatings on aluminium. In general these approaches have not been as successful as the Cr(VI) sealing. Also 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 in REACH compliant processes are preferred options. An adaption of the electrical TSA cycle for improved corrosion resistance without negative impact on fatigue life of components will be developed. Detailed investigations and characterization of the obtained corrosion protected surfaces via ESEM, Raman IR-spectroscopy and ESCA will be performed.'