Effect of cold rolling deformation on the pitting corrosion behavior of high-strength metastable austenitic stainless steel 14Cr10Mn in simulated coastal atmospheric environments

Abstract

The pitting corrosion behaviors of high-strength metastable austenitic stainless steel (MASS) 14Cr10Mn with different cold rolling reductions (0 %, 10 % and 20 %) were investigated in simulated coastal atmospheric environments by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), electrochemical measurements and cyclic corrosion test. The cold rolling deformation noticeably increases the dislocation density in the steel. As the cold rolling reduction changes from 0 % to 20 %, the pitting potential and the polarization resistance decrease to some extent in 1 wt% NaCl solution. The cold rolling deformation increases the defect density and the contents of (Fe,Cr)-oxyhydroxides/hydroxides in the passive film on the specimen surface. After the wet-dry cyclic corrosion test, the corrosion pits initiate at the deformation band regions. The quantity, diameter and depth of the pits gradually increase with enlarging the cold rolling reduction.

Keywords

• Cr-Mn-Ni-N MASS
• Cold rolling deformation
• Microstructure
• Pitting corrosion
• Wet-dry cyclic corrosion test