The uneven corrosion of deep drawn coil-coatings investigated by EIS
authors Bastos, AC; Ferreira, MGS; Simoes, AMP
nationality International
journal ELECTROCHIMICA ACTA
author keywords Coil-coatings; Corrosion; Cupping test; Deep drawing; EIS
keywords PAINTED STEEL SHEETS; MECHANICAL DEFORMATION; GALVANIZED STEEL; FORMABILITY; METALS
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.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2011
volume 56
issue 23
beginning page 7825
ending page 7832
digital object identifier (doi) 10.1016/j.electacta.2010.12.023
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000295437500009
  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