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Corrosion of alumina-based coatings

Korrosion von Beschichtungen auf Aluminiumoxidbasis
 
: Stahr, C.C.; Berger, L.-M.; Herrmann, M.; Deska, D.

Lugscheider, E. ; Deutscher Verband für Schweißen und Verwandte Verfahren e.V. -DVS-; The Thermal Spray Society -TSS-:
Thermal spray crossing borders. ITSC 2008, International Thermal Spray Conference & Exposition. Conference Proceedings. CD-ROM : Maastricht, June 2 - 4, 2008; Lectures and posters
Düsseldorf: DVS-Verlag, 2008 (DVS-Berichte 252)
ISBN: 3-87155-979-2
ISBN: 978-3-87155-979-2
ISSN: 0418-9639
pp.374-377
International Thermal Spray Conference (ITSC) <2008, Maastricht>
English
Conference Paper
Fraunhofer IKTS ()
Fraunhofer IWS ()
Aluminiumoxid; Korrosionsbeständigkeit; Korrosionsschutz; Porosität; thermisches Spritzen; Titanoxid

Abstract
Corrosion protection has long been a challenge to thermally sprayed coatings. Alumina is known for its good corrosion properties, although especially thermally sprayed alumina-based coatings corrode if exposed to certain environments. The coating therefore becomes the limiting part for the component lifetime. Besides the corrosion of the coatings themselves, corrosion of the substrate can result from the existing porosity in the coatings. This work shows the influence of corrosion on alumina-based coatings as a function of the TiO2 content and the coating process used. The effects of corrosion are quantified to enable lifetime prediction and tailoring of protective coatings. The coatings were analyzed using electrochemical methods and were exposed for long periods to acids and bases at 85 deg C. Corrosion properties of the coatings were compared with those of bulk parts, prepared by hot-pressing. An electrochemical method was developed to estimate interconnected of porosity as an alternative to long-term corrosion experiments.

: http://publica.fraunhofer.de/documents/N-93399.html