Inhibitor adsorption processes in mild steel/new bipyrazole derivatives/hydrochloric acid system. (2020)

• Record Type: Journal Article
• Authors: Bouklah, M.; Daoudi, W.; Hammouti, B.; Touzani, R.; Radi, S.; Ramdani, M.; Bouyanzer, A.; Aouniti, A.; Salghi, R.
• Is Part Of: Materials today. Volume 27:Part 4(2020)
• Page Start: 3209
• Page End: 3216
• Publication Date: 2020
• Subjects: Bipyrazole -- Corrosion inhibitors -- Mild steel -- HCl acid -- Thermodynamic functions -- Adsorption process; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.04.507
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The corrosion inhibition of mild steel in 1 M hydrochloric acid solution by some bipyrazole derivatives N, N '-dimethyl- N, N '-bis(1 H -pyrazol-1-ylmethyl)ethane-1, 2-diamine (3a ), 1-{[{2-[[(3-carboxy-5-methyl-1 H -pyrazol-1-yl)methyl](methyl)amino]ethyl}(methyl)amino]methyl}-5-methyl-1 H -pyrazole-3-carboxylic acid (3b ) and 1-{[{2-[{[3-(methoxycarbonyl)-1 H -pyrazol-1-yl]methyl}(methyl)amino]ethyl}(methyl)amino]methyl}-1 H -pyrazole-3-carboxylic acid (3c ) has been studied in relation to the concentration of the inhibitors as well as the temperature using chemical (weight loss) and electrochemical (ac impedance and dc polarisation) techniques. All the methods employed are in reasonable agreement. The protection efficiency increases with increasing inhibitors concentration and with increasing temperature. The thermodynamic functions of dissolution and adsorption processes were calculated from weight loss measurement and the interpretation of the results are given. Adsorption of inhibitor on the carbon steel surface is found to obey the Langmuir adsorption isotherm.