Investigation on Electrochemical Corrosion of 304 Stainless Steel under Thin Electrolyte Layers Containing Chloride Ions

摘要

The corrosion behaviour of 304 stainless steel (304 SS) under thin electrolyte layers containing chloride ions was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Data obtained from potentiodynamic polarization tests show that a reduction in the electrolyte layer thickness result in a negative shift of the pitting potential for 304 SS. Results that were collected from EIS analysis are also consistent with the potentiodynamic polarization curves, demonstrating a decrease in Rct . This decrease indicates corrosion rate increase as the layer thickness decrease. Optical morphologies also reveal an increased amount of small corrosion pits under thinner electrolyte layers.