Carbonate scales (e.g., calcite, CaCO3) and corrosion-induced scales of mild steel (e.g., siderite, FeCO3) in sweet (CO2 containing) conditions are both frequently encountered during oil and gas production. However, the interactions of steel corrosion and mineral carbonate scale formation remain unclear. In this study, a once-through flow cell apparatus was utilized to concurrently study mild steel tubing corrosion and scaling behaviors in a simulated produced water environment. The study shows that a two-layer scale structure forms on the mild steel surface. The inner layer is a carbonate solid solution, i.e., ankerite, Ca(FexMg1-x)(CO3)2. Transition toward a calcite-dominated outer layer was observed. In addition, the impacts of the corrosion-scaling interactions on conventional scale inhibition and corrosion inhibition methods are investigated.

Subject
Test methods, Steel surfaces, Materials, Scale inhibitors, Carbonate scales, Calcite, Ferrous ions, Corrosion scales, Tubing, Scale formation, Corrosion inhibitors, Surface layers, Steel
Keywords:
Mild steel corrosion, ankerite, calcite, scale inhibitor, corrosion inhibitor
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2023
Association for Materials Protection and Performance (AMPP)
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