A Study of Factors Influencing on Dissolution Behavior of Copper in Orthophosphoric Acid Using Rotating Cylinder Electrode (RCE) and Rotating Disc Electrode (RDE)

摘要

The rotating cylinder electrode (RCE) and rotating disc electrode (RDE) are used for investigation ofdissolution behavior of copper in presence of surfactant (Triton x-100, SDS and CPC). The dissolution-7 -2 of copper was studied in 8M H3PO4 as a function of surfactant concentration (510 -1 10 M) ato 25 C. Measurements were conducted based on potentiodynamic polarization method. The inhibitionbehavior of low cost surfactants compounds was inspected. The inhibition efficiency of thesesurfactants was depending on their concentration and their chemical structure. The rotation speed ofRCE and RDE effect was explored. The adsorption of surfactants on copper surface was found to benot obeying Langmuir and followed Kinetic-thermodynamic adsorption isotherm. Activation energy,o the pre- exponential factor and adsorption free energy G ads, are calculated and discussed. Scanningelectron microscope (SEM) was used to characterize the copper surface. Different reaction conditionsand the physical properties of solutions are studied to obtain dimensionless correlation among all theseparameters. Experimental result showed that the inhibition efficiency of SAS improved in presence ofalcohols. The synergism parameters are found to be greater than unity indicating that co-operativeadsorption of alcohols and SAS.