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Journal of Materials Engineering and Performance

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08-02-2018

Preparation and Characterization of Silanes Films to Protect Electrogalvanized Steel

Authors: Pablo R. Seré, Walter Egli, Alejandro R. Di Sarli, Cecilia Deyá

Published in: Journal of Materials Engineering and Performance | Issue 3/2018

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Abstract

Silanes are an interesting alternative to chromate-based surface treatments for temporary protection of electrogalvanized steel. In this work, the protective behavior of 3-mercaptopropyltrimethoxysilane (MTMO), 3-aminopropyltriethoxysilane (AMEO), or 3-glycidoxypropyltrimethoxysilane (GLYMO) films applied on electrogalvanized automotive quality steel sheets has been studied. The silane coating morphology, composition, and porosity were characterized by scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), x-ray fluorescence, immersion in copper sulfate, and cyclic voltammetry. The corrosion protection was evaluated by polarization curves, electrochemical noise measurements, electrochemical impedance spectrometry, and accelerated humidity chamber tests. The results showed that the silanes protect temporarily electrogalvanized steel from corrosion. MTMO forms a relatively thick and cracked film. AMEO and GLYMO films were so thin that they could not be observed by SEM but silicon was detected by EDS. MTMO provided good temporary protection, being an alternative to replace Cr(VI) as protector of electrogalvanized steel.

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Title: Preparation and Characterization of Silanes Films to Protect Electrogalvanized Steel
Authors: Pablo R. Seré
Walter Egli
Alejandro R. Di Sarli
Cecilia Deyá
Publication date: 08-02-2018
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 3/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3178-0

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