Abstract
Abstract A model was developed to investigate the corrosion of a coated pipeline surface in a thin, narrow channel crevice formed between the pipe surface and the coating. Such crevices are often found on natural gas pipelines when the coating is high-density polyethylene (HDPE). Imposed cathodic protection current passage through the holiday and oxygen diffusion through both the holiday and the coating were included in the model. The effect of the corrosion product, ferrous hydroxide (Fe[OH]2), on the transport of oxygen and ionic species in the crevice solution was neglected because it is porous. Mass balance for oxygen pressure and Laplace's equation for the steel potential in the crevice solution were used to derive the model equations. For a crevice solution with uniform pH and uniform resistivity, the model equations were solved using a collocation technique programmed in MATLAB. This new model was validated with published experimental data and model results—good agreement was found.
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