Micro-scale Computer Modelling Of The
Relationship Between Metallurgical
Microstructure And Localized Corrosion Effects
Author(s)
S. G. R. Brown & N. C. Barnard
Abstract
An attempt is made to model the corrosion effects experienced by zinc and
zinc–aluminium coating alloys in contact with conductive, chloride containing
aqueous electrolytes. 3D predictions of localized corrosion of zinc alloy coatings
are made using a control-volume finite difference approach, where an irregular
structured mesh is employed. The model deals with the movement of multiple
evolving conserved concentration fields. Perturbations in concentration are used
to determine the conditions at an exposed surface, in addition to influencing any
processes operating. The effect of coupled-materials and electrolyte present on
the progression of localized corrosion processes is calculated using established
relationships and experimentally derived data.
Quantitative predictions of the corrosion performance at the exposed surface
and cut-edge to electrolyte (used in the accelerated corrosion testing of these
coating alloys) are made. Comparison is made to the predicted form of the
current density fields around corroding surfaces and those observed
experimentally. In addition, absolute metal losses calculated across exposed
areas of the simulated alloys are compared with those estimated during
experimental investigations.
Keywords: zinc alloy coatings, localized dissolution, finite difference method.
1 Introduction
As the cost of corrosion processes accounts for ca 5% GDP of the developed
nations, it is no wonder that a great deal of interest exists in protecting the
world’s infrastructure and durable goods. The use of steel in many applications
Keywords
zinc alloy coatings, localized dissolution, finite difference method.
Related Book
Other papers in this volume
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