Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy

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dc.contributor.author Alcántara García, Andrea
dc.contributor.author García Casas, Amaya
dc.contributor.author Jiménez Morales, Antonia
dc.date.accessioned 2019-05-14T09:14:54Z
dc.date.available 2020-11-01T00:00:05Z
dc.date.issued 2018-11-01
dc.identifier.issn 0300-9440
dc.identifier.uri http://hdl.handle.net/10016/28344
dc.description.abstract The goal of this work was to combine the physical barrier properties provided by the sol-gel network with an active-chemistry protection against corrosion provided by corrosion inhibitors and cross-linking agents. Sol-gel coatings, organic–inorganic hybrid materials were prepared by hydrolysis and condensation of (3-glycidyloxypropyl)trimethoxysilane (GPTMS) and tetraethylorthosilane (TEOS) in an ethanol/water solution. This coatings were satisfactorily modified by adding an inhibitor of the corrosion, namely hexahydrate cerium nitrate, and a cross-linking agent, namely tris(trimethylsilyl)phosphite (TMSP). The synergetic effect of these two compounds was evaluated by means of electrochemical characterization. The evolution rate of the hydrolysis-polycondensation reaction was monitored by Fourier-transform infrared spectroscopy and viscosity. Once the hydrolysis-polycondensation rate was reached, sols were deposited on titanium fabricated by powder metallurgy. The morphological characteristics and elemental distribution of the coatings were studied using scanning electrochemical microscopy (SEM). The solid-state of Si-NMR spectroscopy and thermogravimetric analysis (TGA) was employed in order to identify the cross-linking state of the coating by ensuring the creation of enough siloxane bonds. Impedance measurements were carried out to study the effect of cerium and TMSP on the corrosion resistance. It was observed that the coating with additions of cerium presented stable and good barrier features against 5 mM NaCl solution. The synergy between the cerium inhibitor and the TMSP cross-linking agent was found not to exert a positive effect because the electrochemical behaviour was dominated by the phosphorus compound over the cerium.
dc.description.sponsorship The authors acknowledge the financial support from the Regional Government of Madrid through the program MULTIMAT-CHALLENGE (S2013/MIT-2862). The authors acknowledge the financial support from the European Union and Government of Spain through the program RETOSCOLABORACIÓN. RECORD (RTC-2015-3513-S) [i.e. RTC-2015-3513-5]
dc.format.extent 9
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2018 Elsevier B.V.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Corrosion
dc.subject.other Sol-Gel
dc.subject.other Coatings
dc.subject.other EIS
dc.subject.other Inhibitors
dc.subject.other Titanium
dc.title Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy
dc.type article
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1016/j.porgcoat.2018.01.026
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2013/MIT-2862
dc.relation.projectID Gobierno de España. RTC-2015-3513-5/RECORD
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 267
dc.identifier.publicationlastpage 274
dc.identifier.publicationtitle Progress in Organic Coatings
dc.identifier.publicationvolume 124
dc.identifier.uxxi AR/0000022203
dc.contributor.funder Comunidad de Madrid
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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