Surface evaluation and electrochemical behaviour of doped silane pre-treatments on galvanised steel substrates
authors Trabelsi, W; Cecilio, P; Ferreira, MGS; Yasakau, K; Zheludkevich, ML; Montemor, MF
nationality International
journal PROGRESS IN ORGANIC COATINGS
author keywords silanes; pre-treatment; AFM; SEM; EIS; cerium; zirconium; dopant
keywords EARLY CORROSION BEHAVIOR; SOL-GEL COATINGS; 0.5 M NACL; CERIUM(III) NITRATE; ZINC CORROSION; IMPEDANCE SPECTROSCOPY; CHROMATE REPLACEMENTS; SODIUM-SILICATE; AA 2024-T3; ALUMINUM
abstract The present work aims at evaluating the surface morphology and the corrosion resistance of galvanised steel substrates pre-treated with his[triethoxysilyipropyl] tetrasulfide silane (BTESPT) solutions doped with cerium nitrate or zirconium nitrate. The silane pre-treatment leads to the formation of a silane coating in the metallic surface. The surface morphology of this coating was studied by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The corrosion behaviour of the pre-treated substrates during immersion in 0.05 M NaCl was assessed by the scanning vibrating electrode technique (SVET) and by electrochemical impedance spectroscopy (EIS). The results show that the presence of dopant improves the protective properties of the silane pre-treatment. Moreover, it was found that pretreatments based on silanes doped with cerium nitrate are more resistant against corrosion development due to the corrosion inhibition properties of the cerium ions. (C) 2006 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0300-9440
year published 2007
volume 59
issue 3
beginning page 214
ending page 223
digital object identifier (doi) 10.1016/j.porgcoat.2006.09.013
web of science category Chemistry, Applied; Materials Science, Coatings & Films
subject category Chemistry; Materials Science
unique article identifier WOS:000248094300008
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journal impact factor 2.955
5 year journal impact factor 3.004
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