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Corrosion protection of 304L stainless steel by chemical vapour deposited alumina coatings.

Lazar, Ana-Maria and Yespica, Wolfgang Prieto and Marcelin, Sabrina and Pébère, Nadine and Samélor, Diane and Tendero, Claire and Vahlas, Constantin Corrosion protection of 304L stainless steel by chemical vapour deposited alumina coatings. (2014) Corrosion Science, 81. 125-131. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2013.12.012

Abstract

The corrosion protection of 304L stainless steel by aluminium oxide coatings deposited by metal–organic chemical vapor deposition (MOCVD) was investigated in a 0.1 M NaCl solution at room temperature by polarization curves and electrochemical impedance spectroscopy. The effect of the coating thickness was specifically considered. Transmission electron microscopy cross-section observations of the stainless steel/alumina coating showed that the coating is amorphous and porosity-free. The impedance response, for short immersion times, confirmed the absence of porosity and revealed that the alumina coatings with thickness ranging from 250 nm to 1700 nm provide high corrosion resistance. The corrosion protection increased when the alumina coating thickness increased. However, from the impedance data obtained for different exposure times to the aggressive solution, a threshold film thickness of 500–600 nm was determined, above which the corrosion protection was not improved. Due to their interesting physicochemical properties, such films of amorphous alumina are an innovative and economically accessible alternative to improve the stainless steel corrosion resistance and could be used in miniaturized sensors operating in marine environment.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Corrosion Science website : http://www.sciencedirect.com/science/journal/0010938X
HAL Id:hal-01116547
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Fondation de Coopération Scientifique Science Technique Aéronautique et Espace - FCS STAE (FRANCE)
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Deposited By: Diane SAMELOR
Deposited On:13 Feb 2015 15:23

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