Corrosion protection of steel cut-edges by hot-dip galvanized Al(Zn,Mg) coatings in 1wt% NaCl: Part I. Experimental study
authors Dolgikh, O; Simillion, H; Lamaka, SV; Bastos, AC; Xue, HBB; Taryba, MG; Oliveira, AR; Allely, C; Van den Bossche, B; Van den Bergh, K; De Strycker, J; Deconinck, J
nationality International
journal MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
author keywords Al(Zn Mg) alloys; corrosion products; cut-edge corrosion; metallic coatings; SVET-SIET measurements
keywords AL-MG COATINGS; ZN-MG; COATED STEEL; ATMOSPHERIC CORROSION; RESISTANCE; PRODUCTS; MECHANISM; ALUMINUM; MAGNESIUM; BEHAVIOR
abstract Corrosion of AlZnMg coated steel in chloride media is a complicated process, which progress is determined not only by the electrode reactions but also by the local pH and formation of soluble and insoluble corrosion products. In order to adequately describe and predict the corrosion behavior of steel/AlZnMg cut-edge, a multi-ion transport, and reaction model (MITReM) is built. Such model takes into account the transport of species in the solution together with their production/consumption in electrochemical and chemical reactions. The main aim of this work is the validation of a numerical model for describing and predicting corrosion of steel/AlZnMg cut-edge in immersed conditions. This first part describes the experimental work done to obtain model input parameters and validation measurements. The metallic coatings are characterized experimentally with respect to their composition and microstructure, global and local electrochemical behavior (polarization curves, AESEC, and SVET). Local distribution of corrosion products and local pH are also characterized. No blocking effect of the precipitated corrosion products has been observed and dedicated measurements are performed to validate this observation. Based on the experimental input from this part, numerical models of cut-edge corrosion with different levels of details are developed in Part II.
publisher WILEY-V C H VERLAG GMBH
issn 0947-5117
isbn 1521-4176
year published 2019
volume 70
issue 5
beginning page 768
ending page 779
digital object identifier (doi) 10.1002/maco.201810209
web of science category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000471998800001
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journal analysis (jcr 2019):
journal impact factor 1.533
5 year journal impact factor 1.654
category normalized journal impact factor percentile 39.235
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