The possible use of the EPR method for demonstration of susceptibility to corrosion in duplex stainless steels (DSS) is described. Some modifications were necessary to enable the application of the two EPR methods (double loop 'DL', single loop 'SL') for testing DSS. Changes were made in electrolyte composition, temperature, surface condition and parameters of polarisation. The rolled DSS were solution annealed and isothermally treated at 650°C, 750°C and 850°C for 3 to 600 minutes before testing. Microstructural examinations gave information about the type and amount of segregation caused by the isothermal treatment. EPR testing showed, that the examined material becomes susceptible to selective or intergranular corrosion after sensitisation. The correspondence between microstructure and the results of corrosion testing is discussed. Advantages and disadvantages of the two EPR methods are compared.