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CO2 corrosion product scales formed on 13Cr tubing steel in autoclave and in the simulated corrosion environment of oil field are<br>investigated in the paper. The surface and cross-section profiles of the scales were observed by scanning electron microscopy (SEM),<br>the chemical compositions of the scales were analyzed using energy dispersion analyzer of X-ray (EDAX), X-ray diffraction (XRD)<br>and X-ray photoelectron spectroscopy (XPS) to confirm the corrosion mechanism of the 13Cr steel in the simulated CO2 corrosion<br>environment.