Modelling The Localized Corrosion Effects
Experienced By Zinc–4.5wt.% Aluminium
Steel Coatings In 5% NaCl Solution
Author(s)
N. C. Barnard, S. G. R. Brown & H. N. McMurray
Abstract
An attempt is made to quantitatively represent the localized corrosion effects
experienced by zinc and zinc-aluminium coatings in contact with aqueous
chloride electrolytes. The model is intended to operate at the micro-mesoscopic
scale to include features of metallurgical interest associated with these coating
alloys. Using the finite difference method, field based simulations estimate the
location and intensity of localized phenomena brought about by predicted
dissolution events occurring at the surface of an alloy coating. Perturbations in
the ion concentration are evaluated by the model to determine potential and
current flux in solution. Differing coating thicknesses are considered in addition
to differing microstructures resulting from production conditions. From these,
normalized current density fields predicted in the electrolyte present are
evaluated.
Keywords: localized corrosion, modelling, zinc aluminium steel coatings, finite
difference, microstructure.
1 Introduction
There has always been an interest in protecting steel, one of the most prominent
engineering materials in the construction industry against the detrimental effects
of corrosion. Corrosion effects can be seen to alter material properties, and with
the associated economic impact of corrosion, it is often desirable to limit the
opportunity and influence of this physicochemical process on the world’s
durable goods and infrastructure. Metallic coatings are used in the protection of
Keywords
localized corrosion, modelling, zinc aluminium steel coatings, finite
difference, microstructure.
Related Book
Other papers in this volume
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