ELECTROCHEMICAL MEASUREMENTS OF THE CORROSION BEHAVIOR OF TYPE 304LSSIN N2H4 CONTAINING CO2

Electrochemical dc and ac methods were used to evaluate the corrosion behavior of stainless steel 304L in hydrazine (N2H4) with or without a dditions Of CO2. Tafel slopes and corrosion current densities were obt ained from the analysis of polarization curves recorded in the vicinit y of the corrosion potential after elimination of the ohmic drop. Elec trochemical impedance spectroscopy was used to monitor the continuous changes of the corrosion kinetics with increasing additions of CO2 in N2H4. The results obtained with both techniques show that minute addit ion (up to 100 PPM) Of CO2 increased the corrosion rate of the stainle ss steel in N2H4. Further CO2 addition produced no additional changes.