Investigation of 2,2′-diaminodiethyl disulfide for mild steel protection in acid solution

• Published in: Journal of molecular structure 2020-07, Vol.1212, p.128120, Article 128120
• Main Author: Sığırcık, Gökmen
• Format: Article
• Language: English
• Subjects: Adsorption; Corrosion inhibitor; EIS; SEM
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2020.128120

Inhibition performance of 2,2′-diaminodiethyl disulfide (DA) was studied against mild steel (MS) corrosion in 0.5 M HCl. Electrochemical impedance spectroscopy (EIS), potentiodynamic (PD) polarization measurements were utilized to investigate the influence of inhibitor concentration and temperature on efficiency, as well as explanation of inhibition mechanism. Scanning electron microscopy (SEM) analysis was utilized to investigate the surface damages due to corrosion, in the absence and presence of inhibitor molecules. PD data revealed that the studied molecule exhibits mixed type inhibitor behavior on steel surface. Moreover, the calculated free adsorption energy (ΔGadso) value is 38.45 kJ mol−1, which indicates to strong adsorptive interaction by both physical and chemical means. UV–Visible study results supported the idea that there is strong interaction between the surface with the molecule, via its –S and –N atoms. As a consequence, 91.7% inhibition efficiency was determined in presence of 1.0 mM DA. [Display omitted] •Inhibition performance of 2,2′-Diaminodiethyl disulfide was investigated in acid solution.•91.7% inhibition efficiency was obtained in presence of 1.0 mM inhibitor concentration.•The inhibitor molecules strongly adsorbed on the surface via free adsorption energy value of 38.45 kJ mol−1.•High inhibition efficiency under elevated high temperature, due to chemisorptive behavior.