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
|