Abstract
The electrochemical properties of the alloys treated and untreated by a fluorination solution have been investigated by cyclic voltammogram (CV) and electrochemical impedance spectroscopy (EIS). CV results show that the alloy after treatment has more active sites than the untreated one. EIS results show that for the untreated alloy, at the higher open-circuit voltage (OCV) (−0.940 V vs. HgO/Hg), the Heyrovsky reaction and hydrogen transfer are responsible for the mixed rate-determining process. While at the lower OCV (−0.780 vs. HgO/Hg), besides hydrogen transfer, hydrogen diffusion dominates the reaction rate. However, for the treated alloy, in both cases of the higher and lower OCVs, hydrogen diffusion and transfer are the mixed rate-controlling step. The significant difference between them is attributed to the different surface layers on the treated and untreated alloys. In addition, the fluorination treatment does not improve the anticorrosion properties of -type alloys in a strong alkaline solution. © 2001 The Electrochemical Society. All rights reserved.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
