Evaluation of self-healing ability in protective coatings modified with combinations of layered double hydroxides and cerium molibdate nanocontainers filled with corrosion inhibitors
authors Montemor, MF; Snihirova, DV; Taryba, MG; Lamaka, SV; Kartsonakis, IA; Balaskas, AC; Kordas, G; Tedim, J; Kuznetsova, A; Zheludkevich, ML; Ferreira, MGS
nationality International
journal ELECTROCHIMICA ACTA
author keywords Self healing; Coatings; Nanocontainers; Corrosion
keywords SOL-GEL COATINGS; GALVANIZED STEEL; THIAZOLE DERIVATIVES; ZINC; PRETREATMENTS; SVET; RESERVOIRS; ALUMINUM; SURFACE
abstract Nowadays, there is a strong demand on the search of thinner, but more effective organic coatings for corrosion protection of metallic substrates, like galvanised steel, used in the automotive industry. In order to guarantee effective corrosion protection of these coatings, and because chromate-based pigments cannot be used, one of the most attractive strategies consists on the modification of the organic matrix with nano-additives filled with corrosion inhibitors, which can be released to the active sites. In this work, two different nano-additives are explored as potential self-healing materials for the development of active protective coatings. These additives are layered double hydroxides and cerium molybdate hollow nanospheres loaded with mercaptobenzothiazole, as a corrosion inhibitor. These additives were added to epoxy primers, individually, or combining the two nanoadditives in the same layer. The electrochemical behaviour and the potential of self-healing ability were studied by electrochemical impedance spectroscopy, scanning vibrating electrode technique and scanning ion-selective electrode technique. The results reveal that both types of nanocontainers can provide effective corrosion inhibition on artificial induced defects, at different stages of the degradation process. Moreover, the results also show that there is a synergistic effect concerning corrosion inhibition and self-healing potential when a mixture of the two nanocontainers is used. The mechanism of self healing is presented and discussed in terms of effect of organic inhibitor and role of the nanocontainers, including effect of cerium ions released from cerium molibdate nanoparticles. (C) 2011 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2012
volume 60
beginning page 31
ending page 40
digital object identifier (doi) 10.1016/j.electacta.2011.10.078
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000300142100006
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 5.116
5 year journal impact factor 4.857
category normalized journal impact factor percentile 83.929
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg