Electrochemical study of S and Pb adsorption on Ni in aqueous acidic media
By Ebrahimy, A. F.; Hermoso-Diaz, I. A.; Newman, R. C.
Published in Corrosion Science
Corrosion Science
2020
Abstract
The adsorption competition of lead and sulfur on nickel has been explored in acidic aqueous media at room temperature by examining the electrochemical behavior of Ni. A separate PbO or K2S4O6 inoculation resulted in significant inhibition and activation of Ni corrosion, respectively. The investigation of the combined effects of Pb and S revealed that S mostly dominates over Pb for adsorption on Ni. When added in sequence and in different proportions, the kinetic evidence indicates neither species fully replaces the other on a pure metallic Ni surface, i.e., some permanent effect of Pb was observed even after S was added.