Publication Type Journal Article
Title Sensing polymer inhomogeneity in coated metals during the early stages of coating degradation
Authors R.G. Duarte Sergio Gonzalez A S Castela M. G. S. Ferreira R. M. Souto
Groups
Journal PROGRESS IN ORGANIC COATINGS
Year 2012
Month June
Volume 74
Number 2
Pages 365-370
Abstract Negative-feedback scanning electrochemical microscopy (SECM) is successfully applied to visualize spatially resolved differences in the topography of coated metal samples upon exposure to aqueous electrolyte solutions of different composition. This method allows the investigation of the uptake of reactants from the electrolyte phase through the polymeric matrix to the metal/polymer interface to be performed even at early exposures. Yet, the method must be carefully checked to discard transport processes from the organic matrix into the solution phase, such as those related to lixiviation. In this later case, the topography of the polymer layer may evolve with time accordingly, not longer exclusively responding to the uptake by the polymer matrix of components from the electrolyte phase. Furthermore, lixiviated species may also react with the SECM tip, eventually leading to the continuous modification of the active surface area of the electrode during the measurements. In this work, the effect of lixiviation from a nickel foil coated with plasticized PVC (PVC Plastisol) on its topographic characterization by SECM was investigated. (C) 2011 Elsevier B.V. All rights reserved.
DOI http://dx.doi.org/10.1016/j.porgcoat.2011.11.009
ISBN
Publisher
Book Title
ISSN 0300-9440
EISSN
Conference Name
Bibtex ID ISI:000303307000012
Observations
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