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The influence of different chloride concentrations (0.1M, 0.3M and 1.0M NaCl) on the pitting corrosion resistance of 10%Cr corrosion-resistant steel after 10 days of natural passivation in simulated concrete pore solution (SCPS) was investigated using cyclic potentiodynamic polarization (CPP), electrochemical impedance spectroscopy (EIS), confocal laser scanning microscopy (CLSM) and SEM/EDXA.Conventional low-carbon steel and well-known 2304 duplex stainless steel were also tested for the comparative purpose.The results indicated that the pitting corrosion behavior of 10%Cr steel was very similar to that of 2304 duplex stainless steel in SCPS with 0.1M and 0.3M NaC1.However, at high chloride concentration of 1.0M, 2304 duplex stainless steel exhibited much higher pitting corrosion resistance compared with 10%Cr steel due to its much higher Cr content and the presence of alloying element Ni.Nevertheless, the pitting corrosion resistance for 10%Cr steel was significantly higher than conventional low-carbon steel in the case of higher chloride concentration of 1.0M in SCPS.The relatively higher pitting corrosion resistance for 10%Cr steel was mainly attributed to the formation of more protective and stable passive film and Cr-bearing dense rust layer, thus inhibiting the initiation and propagation of corrosion pits, respectively.