Corrosion behaviors of P110 steel and chromium coating in CO₂-saturated simulated oilfield brine

Abstract

The protective chromium coating was prepared on P110 steel by employing pack cementation. The corrosion behaviors of P110 steel and the obtained coating in CO₂-saturated simulated oilfield brine were studied by static complete immersion tests and electrochemical measurements. The corrosion attacks of the samples were determined by mass loss, corroded surface morphologies, corrosion products, and results of electrochemical measurements. The experimental results showed that the coating was uniform, continuous and compact. The chromium coating was slightly corroded, and the mass loss and corrosion rate of the coating were far lower than those of P110 steel. Chromium coating has higher self-corroding potential and lower corrosion current density than P110 steel in accordance with the electrochemical tests results. Taken as a whole, chromizing treatment has significantly improved the corrosion resistance of P110 steel.

Keywords

corrosion behavior / P110 steel / chromium coating / simulated oilfield brine

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