In 1996 Pots has written a two-dimensional (2-D) stochastic algorithm to simulate the morphology of localized attack. The rule based algorithm operates on the assumption that the morphology of corrosion attack depends on the balance of two processes: corrosion (leading to metal loss) and precipitation (leading to metal protection). The rules of the original algorithm were modified to enable simulation of a broader variety of localized corrosion morphologies found in practice. The algorithm, which uses scaling tendency as the only input parameter, was connected with the mechanistic model of CO2 corrosion so that the morphology of localized attack can be predicted as a function of primitive parameters such as temperature, pH, partial pressure of CO2, velocity, etc.

Based on the results of the simulations, it was postulated that partially protective films are sufficient to trigger localized attack, which is in agreement with the experimental observations.

Subject
Mechanistic models, Films, Steel surfaces, Precipitation (solids), Modeling, Corrosion rate, Protective films, Surface morphology, Algorithms, Corrosion attacks, Localized corrosion, Grain, Scaling
Keywords:
localized corrosion, model, stochastic, pitting, iron carbonate, scaling tendency, steel
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2004
Association for Materials Protection and Performance (AMPP)
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