Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel
authors Yasakau, KA; Kallip, S; Lisenkov, A; Ferreira, MGS; Zheludkevich, ML
nationality International
journal ELECTROCHIMICA ACTA
author keywords galvanized steel; cut-edge; localized corrosion; in situ AFM; adhesive
keywords ZN(MG,AL) COATED STEEL; MECHANISTIC APPROACH; POLYMERIC COATINGS; ZINC; DELAMINATION; RESISTANCE; INHIBITION; ALLOYS; DEFECT; MODEL
abstract The mechanisms of the initial stages of localized corrosion at cut edges were investigated for adhesively bonded Zn (Z) and Zn-Al-Mg (ZM) galvanized steel. The results provided strong evidence for the localized nature of corrosion of galvanized coatings at the cut edges and at the adhesive/zinc interface. In both cases a defined localized corrosion attack on zinc in Z sample was observed. On the contrary, in the case of the ZM specimen both zinc solid solution and eutectics exhibited local corrosion. The local attack at the adhesive/Z(ZM) interface was correlated with an anodic undermining process. It develops near the cut-edge surface and at the buried deep adhesive-zinc interface and results in adhesive disbonding in the buried interface. The electrochemical studies revealed that the corrosion kinetics at the metal cut-edges decreases during immersion, which could be due to formation of corrosion products on both steel and zinc surfaces. (C) 2016 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2016
volume 211
beginning page 126
ending page 141
digital object identifier (doi) 10.1016/j.electacta.2016.06.045
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000380904100016
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journal impact factor (jcr 2016): 4.798
5 year journal impact factor (jcr 2016): 4.630
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