2016 Volume 65 Issue 12 Pages 520-526
SUS304 and SUS430LX stainless steels were subjected to cyclic voltammetry (CV) in EMI-TFSI ionic liquid containing water of 5.5, 30 and 5000 ppm at room temperature. Structural changes of passive film during CV was characterized by AES and TEM/EELS. Passive films after CV were mainly composed of mainly Cr and Fe oxides similar to that formed in aqueous solutions. The thickness and Cr cation fraction of passive film increased with increasing CV cycles. Furthermore, much Cr concentrated and thinner passive films were formed with less water content in EMI-TFSI. It is concluded that SUS304 and SUS430LX stainless steel are corrosion resistant in EMI-TFSI ionic liquid with small amount of water.
