This paper presents the effect of the deposition of sand and actual field sludge on the corrosion mechanism of carbon steel in sour environments. Under-deposit corrosion (UDC) of carbon steel was studied underneath the sand deposit and the field collected sludge deposit in a simulated sour environment by means of linear polarization resistance (LPR), coupled multi-electrode array system (CMAS) and weight-loss coupons.

The results showed that when actual field sludge was deposited on the carbon steel surface, significant general and localized corrosion rates were observed. While in the sand deposit test, the general and localized corrosion rates were found to be very low, even lower than the no deposit test. No UDC was observed on coupons tested under the sand deposit, meaning that sand inhibits corrosion of carbon steel in a sour environment.

Subject
Sand, Corrosion rate, Sour environments, Under deposit corrosion, Silicate deposits, Sludge, Corrosion inhibitors, Carbon steel, Immersion, Corrosion coupons, Deposit corrosion, Linear polarization resistance, Electrodes
Keywords:
Coupled multi-electrode array system, under-deposit corrosion, linear polarization resistance and sour environments
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2017
Association for Materials Protection and Performance (AMPP)
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