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Evaluation of the role of surface pretreatments on the corrosion process. Correlation between conventional and electrochemical tests
Author(s) -
Gimeno Pérez M. J.,
Molina Castellanos J.,
Izquierdo Escrig R.,
Puig Brugal M.,
GarcíaGarcía C.,
Gracenea Zapiraín J. J.,
Suay Antón J. J.
Publication year - 2017
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201609304
Subject(s) - dielectric spectroscopy , microcrystalline , materials science , corrosion , electrochemistry , carbon steel , chemical engineering , amorphous solid , phosphate , metallurgy , chemistry , electrode , organic chemistry , engineering , crystallography
The influence on the anticorrosion properties of three different pretreatments applied on steel panels, before being powder‐paint coated, is investigated both by conventional tests (cross cut, impact resistance, and neutral salt spray tests) and electrochemical tests (electrochemical impedance spectroscopy (EIS) and accelerated cyclic electrochemical technique (ACET)). Amorphous phosphate, microcrystalline phosphate, and a sol‐gel, based on 3‐aminopropyltriethoxysilane (APTES), were the different pretreatments that were analyzed. All of them were compared with a non‐pretreated coated carbon steel panel. The microcrystalline phosphate, followed by the sol‐gel surface treatments, showed the best system properties. These good results are attributed toP O 4 − 3ions available at the interface, and to covalent bonds generated by the silicon network and the substrate surface, respectively.