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Investigation of FeS Precipitation Kinetics by EQCM

In the present study an Electrochemical Quartz Crystal Microbalance (EQCM) was used to investigate iron sulfide (FeS) precipitation kinetics from 40°C to 80°C in an aqueous H2S corrosion environment. For these FeS precipitation experiments two different substrates were used: a cathodically polarized iron-coated quartz crystal and a freely corroding iron-coated quartz crystal. The precipitation rates measured were repeatable and consistent when compared at the same temperature. It was noticed that the precipitation rates of FeS were not very sensitive to the change of temperature. It was also observed that the FeS saturation level on the substrate surface should be taken into consideration when the bulk saturation level of FeS is relatively low as the surface pH could be up to three units higher than the solution pH due to the cathodic polarization. From the obtained EQCM results the theoretical kinetic constant and the activation energy for FeSwere determined (based on bulk saturation only) from three possible FeS formation pathways.

Product Number: 51319-13425-SG
Author: Zheng Ma
Publication Date: 2019
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