Modelling of the Surface Degradation of Carbon Steel in Atmospheric Exposures
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Date Uploaded:
25 November 2022
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While performing atmospheric corrosion tests of carbon steel outdoors in Mauritius, it was observed that the surface of the corroded base metal was uneven, consisting of shallow pits which became larger with increase in corrosion loss. The present study was therefore performed to investigate the changes in the surface roughness of the base metal with corrosion loss. The aim was to develop a model for the prediction of corrosion loss from surface roughness data. Six different sites were considered and samples were collected over a 1 ½ year period. Amplitude, spacing and hybrid 2D surface roughness parameters were measured on the skyward surfaces of the samples. The model for the surface degradation was determined through statistical analysis using the multiple linear regression technique and statistical tests were performed to validate it. From the model developed, it was found that corrosion loss was dependent on the time of exposure, the carbon content of the carbon steel and the Roughness Volume Oil Retention parameter.
