Abstract
The corrosion of silver in acetic acid was studied using potentiodynamic polarization technique in absence and presence of different concentrations of urea, thiourea and N-allylthiourea. The inhibition efficiency was found to depend on both the inhibitor type and concentration. The inhibitive action of these compounds is based on the formation of salt complex and/or the adsorption of the protonated species on the metal surface according to Temkin's isotherm. The thermodynamic parameters Kads and ΔG°ads for the adsorption process are calculated and discussed.
Highlights
Acid solutions are widely used in industry, e.g., chemical cleaning, descaling and pickling, which leads to corrosive attack
The anodic-cathodic potentiodynamic polarization curves of silver electrode in 0.1M CH3COOH in the absence and presence of different concentrations of N-allylthiourea is shown by the curves of Fig.1, at 25oC
The anodic corrosion behavior of silver electrode in 0.1M acetic acid is accompanied by hydrogen evolution reaction on the metal surface
Summary
Acid solutions are widely used in industry, e.g., chemical cleaning, descaling and pickling, which leads to corrosive attack. The choice of effective inhibitors is based on their mechanism of action and electron-donating ability Urea and their derivatives are well known as corrosion inhibitors and can effectively protect various metals from corrosion [12,13,14]. It has been proposed that organic inhibitors adsorbed on the metal surface change the electrolyte double layer structure and affect the electrochemical reactions. In this way, the metal is partly isolated from the corrosion and it is more difficult for the metal atoms to pass from the lattice into the solution as ions [16].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
