Electrochemical investigations of stainless steels used in flue‐gas desulphurization units

Presents the results of direct current polarization and exposure measurements of alloy steels, used as construction materials for flue‐gas desulphurization units. Ascertains that in some cases there is unconformity between results of classic anodic cyclic polarization and results of laboratory exposure. Proposes a modified methodology for the evaluation of the susceptibility of alloy steels to pitting (multiple anodic polarization). Discusses results on the basis of the tested steels’ composition analysis and results of polarization measurements. Determines the conditions in which the pitting resistance equivalent should be used. Tests have been carried out in electrolyte‐simulating conditions in the purified gas zone of the wet flue‐gas desulphurization units. On the basis of the experimental data, determines flexibility for pitting corrosion of investigated materials.