Alternating voltage induced oscillation on electrochemical behavior and pitting corrosion in duplex stainless steel 2205

Potentiodynamic polarization and potentiostatic passive measurements were performed to study the effects of alternating voltage (AV) interference on duplex stainless steel (DSS) 2205 corrosion. The results reveal that AV signals cause positive shift in open circuit potential (OCP) and strong oscillations on polarization curves of DSS 2205. For potentiostatic passive condition, the passive current increases with increasing the amplitude of AV signals with a frequency of 50 Hz. The vibrations on polarization and passivation are weakened after increase in frequency (>50 Hz). AV signals with frequency smaller than 50 Hz also induce evident oscillation on OCP, polarization, and passivation on samples. The high-amplitude AV interferences with 50 and 100 Hz induce big pits on DSS 2205 samples, the pitting corrosion however is inhibited with further increasing the frequency.