The effect of nitriding on the corrosive properties of HP-13Cr stainless steel in extremely aggressiveenvironmental conditions was investigated. The composition, structure, and corrosion resistance ofHP-13Cr before and after adding nitrogen were investigated with X-ray diffraction (XRD) analysis, Xray photoelectron spectroscopy (XPS), atom probe tomography (APT), and electrochemical autoclave.The results show that nitrogen is probably enriched at the grain boundary during diffusion,strengthening the grain boundary. This plays a decisive role in the improvement of corrosionresistance. After nitriding, the corrosion resistance of HP-13Cr stainless steel in both CO2 andCO2/H2S environments was significantly improved. This study provides a reference for this method toimprove the corrosion resistance of stainless steel in extreme aggressive environments..
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