INTERACTION OF MECHANICAL AND ELECTROCHEMICAL FACTORS DURING CORROSION-FATIGUE OF FE-26CR-1MO STAINLESS-STEEL IN 1M H2SO4 SOLUTION

The cyclic plastic straining electrode technique has been used to inve stigate the transient electrochemical behaviour of Fe-26Cr-1Mo stainle ss steel in 1M H2SO4 solution at a passive potential. The influence of plastic strain amplitude and plastic strain rate on the dissolution c urrent response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the sur face film rupture and repassivation of the new surface. The high plast ic strain amplitude and the high plastic strain rate caused a change o f electrochemical activity of specimen surface. In the condition of lo w strain amplitude and strain rate:, the characteristics of current re sponse was mainly relative to the process of new surface repassivation . The competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate.