Influence of cold and hot rolling on the corrosion behaviour of duplex stainless steels in mine water environment

This study examined the corrosion behaviour of cold and hot rolled duplex stainless steel materials in mine water. Both gravimetric and electrochemical methods (potentiodynamic polarisation and open circuit potential) were adopted to monitor the corrosion of the alloys. Microscopy analyses were used to understand the degradation phenomena. In comparison, cold-rolled stainless steels displayed better resistance than hot-rolled materials under the tested conditions. The mine water pH was in the range that could lead to passivation of the sample and hence, the environmental impact was not aggressive enough to create many inferences. The surface deteriorations for cold and hot rolled steel materials were therefore not severe in both SEM (Scanning Electron Microscope) and OM (Optical Microscope) analysis results.