Effects of deformation on corrosion resistance of a duplex stainless steel in concrete pore environment

摘要

The influence of cold deformation on microstructure, electrochemical behaviour, and passive film of 2205 duplex stainless steel in simulated concrete pore solution containing chloride was investigated. The composition of the passive film with different deformation was observed through X-ray Photoelectron Spectroscopy (XPS) analysis. Cold deformation introduced a great impact on internal microstructure. The pits first initiated at austenite phase, and then transferred to ferrite phase with the increase of deformation reduction from 50% to 90%. The passive film exhibits as a p-type and n-type semiconductor in simulated concrete pore solution with different deformation level, and the doping densities increase with the increase of deformation reduction. In addition, the composition of the passive film was significantly affected by the deformation, and a decrease of the CSL boundaries in the microstructure, and Cr/Fe ratio in the passive film after deformation result in less protection of the stainless steel.