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Abstract
Corrosion experiments were performed with X65 pipeline steel under static supercritical carbon dioxide (SC CO 2) conditions at 50, 80, 110 and 130 °C. The morphology, structure, chemical composition and fracture toughness of CO 2 corrosion scales formed on the surface of X65 pipeline steel at various temperatures were investigated by means of Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Energy Dispersive X-ray Spectroscopy (EDS). The corrosion rates were measured using weight-loss method. The fracture toughness of CO 2 corrosion scale formed at different temperatures was investigated by means of nanoindentation and Vicker's indentation on a polished cross-section of the CO 2 corrosion scale. The results showed that the corrosion rates increased from 50 °C to 80 °C and then decreased from 80 °C to 130 °C. As the temperature increased, the fracture toughness of CO 2 corrosion scale first decreased and then increased, and the lowest fracture toughness was found at 80 °C. The corrosion rate (CR) has a quantitative relationship with the fracture toughness ( K IC ) CR = ( 3.25 / K IC 3 / 2 ) − 0.908 .
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