The CO2-SCC susceptibility of tensile wires of flexible pipes was investigated. Wire specimens were tensioned in four-point bending jigs and exposed to different simulated annulus environments at high CO2 partial pressure. Unloaded specimens were exposed to the same test environments and corrosion rates were calculated from their mass loss. Artificial sea water solutions at different temperatures were used as electrolyte. Some specimens were pre-corroded in aerated artificial sea water before exposure to the CO2 environments. The corroded surface of the specimens after removal of corrosion products was analyzed using scanning electron microscopy. Cracks associated with localized attacks were observed in the tensioned specimens exposed to some of the simulated conditions. Temperature and pre-corrosion in aerated sea water influenced cracking susceptibility significantly.

Subject
Steel surfaces, Marine environments, Water, Piping, Corrosion rate, Mass loss, Wiring, Corrosion cracking, Siderite, Precorrosion, Corrosion products, Film formation, Corrosion protection
Keywords:
carbon dioxide, carbon steel, corrosion, flexible pipe, iron carbonate, iron oxy-hydroxide, oxygen, stress corrosion cracking
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2022
Association for Materials Protection and Performance (AMPP)
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