We have used in-situ synchrotron x-ray diffraction to experimentally investigate the effect of two common scale inhibitors amino trimethylene phosphonic acid (ATMPA) and polyethyleneimine (PEI) on the corrosion rate and protective scale formation process during CO2 corrosion of carbon steel. These experiments were performed under mild anodic polarization in sodium chloride solutions at ~ 1 bar CO2, 80 °C and pH 6.3, such that protective scales would readily form in the absence of any organic scale inhibitors. These results are compared against longer-term open circuit data corrosion tests in similar conditions but at up to 30 bar CO2.

Subject
Electric current, X-ray diffraction, Corrosion rate, Scale inhibitors, Protective scales, Siderite, Partial pressures, Acidity, Corrosion scales, Sodium chloride solution, Iron carbonate scale, Scale formation, Corrosion inhibitors
Keywords:
CO2 corrosion, scale inhibitor, mild steel, corrosion rate
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2012
Association for Materials Protection and Performance (AMPP)
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