Chemical inhibition in the presence of silica sand deposit has been reported as a cause of severe localized corrosion attack in CO2-saturated brine environments. This paper suggests a new mechanism for explaining physics behind the localized corrosion attack based on experimental evidences. The effect of sand size and deposit type on localized corrosion attack in the presence of imidazoline type inhibitor is also experimentally investigated in CO2-saturated brine solution. Smaller silica sand particles (diameter less than 44 micron) are found to cause less localized corrosion attack in comparison to larger sand particles (In the range of 250-750 micron diameter). Localized corrosion attack in the presence of paraffin deposit is also negligible compared to silica sand deposit.

Subject
Scanning electron microscopy, Sand, Metal surfaces, Uniform corrosion rate, Silica, Paraffin, Crevices, Corrosion attacks, Corrosion inhibitors, Deposit corrosion, Localized corrosion, Cathodic inhibitors, Anodic inhibitors
Keywords:
under-deposit, localized corrosion, inhibitor, sand, paraffin
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2017
Association for Materials Protection and Performance (AMPP)
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