Corrosion mitigation via a pH stabilization method in monoethanolamine-based solutions for post-combustion CO2 capture

•Initial corrosion of carbon steel was accelerated by decreasing pH.•FeCO3 layer formation and subsequently passivation were promoted by decreasing pH.•Dissolved oxygen is shown to substantially affect corrosion in amine solutions.•A dominant effect of dissolved oxygen is to retard protective layer formation.•pH stabilization is a possibly effective way to reduce corrosion for CO2 capture.