Publication Type Journal Article
Title The uneven corrosion of deep drawn coil-coatings investigated by EIS
Authors A. C. Bastos M. G. S. Ferreira AMP Simoes
Groups
Journal ELECTROCHIMICA ACTA
Year 2011
Month September
Volume 56
Number 23
Pages 7825-7832
Abstract The corrosion distribution along a coil-coating sample formed by deep-drawing is reported. The formed rectangular cup was divided in five different regions and their impedance response investigated independently. The response of each region was compared with the overall sample response and the morphology of degradation was studied by scanning electron microscopy. Severe attack was observed in the most strained regions (corners and edges). Micro-defects in the shape of pinholes and cracks developed as a consequence of the forming process, apparently nucleating in the vicinity of the inorganic particles present in the paint. Immersion increased the size and number of defects. The overall impedance was reconstructed from the impedance measured in the local regions by two methods: (a) calculation using the local experimental data and (b) simulation using an equivalent electrical circuit with the values taken from the fitting of the local experimental data. (C) 2010 Elsevier Ltd. All rights reserved.
DOI http://dx.doi.org/10.1016/j.electacta.2010.12.023
ISBN
Publisher
Book Title
ISSN 0013-4686
EISSN
Conference Name
Bibtex ID ISI:000295437500009
Observations
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