Piperazine derivatives as inhibitors of the corrosion of mild steel in 3.9 M HCl

Abstract

The inhibitory action of two piperazine derivatives, 1-benzyl piperazine (P1) and bis(1-benzylpiperazine) thiuram disulfide (P2) on the corrosion of mild steel in 3.9 M HCl at different concentrations has been investigated in the temperature domain 298-333 K. Both weight loss measurements and potentiodynamic polarization methods showed that P2 was the best inhibitor and that its inhibition efficiency increased with concentration to a value [92% at 10 -3 M. Potentiodynamic polarization studies clearly revealed that P2 acts as cathodic-type inhibitor. The activation energy for the corrosion rates was evaluated in the temperature range 298-333 K. Adsorption of P2 on the mild steel surface in 3.9 M HCl followed a Langmuir isotherm model. A physical adsorption phenomenon is proposed.

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…The creation of a protective barrier over the metal surface was verified by SEM and FTIR. 146 Ousslim et al (2009) evaluated the mild steel corrosion inhibition efficiency of two piperazine derivatives in an aggressive solution of 3.9 M HCl through the PDP and WL methods. 147 Mohamed (2006) investigated quinine as a corrosion inhibitor for low carbon steel in HCl solution using the PDP and EIS methodologies, reporting an inhibition efficacy of 96% at a concentration of 0.48 mM.…”

“…146 Ousslim et al (2009) evaluated the mild steel corrosion inhibition efficiency of two piperazine derivatives in an aggressive solution of 3.9 M HCl through the PDP and WL methods. 147 Mohamed (2006) investigated quinine as a corrosion inhibitor for low carbon steel in HCl solution using the PDP and EIS methodologies, reporting an inhibition efficacy of 96% at a concentration of 0.48 mM. 148 Rajeswarie et al (2013) investigated the inhibition activity of three Schiff bases on cast iron using aqueous solutions of NaCl, NaOH, NH 4 Cl, and HCl.…”

Pyrazine Derivatives as Green Corrosion Inhibitors

“…Thus, through interaction between these charged molecules, the inhibitor molecules deposited onto metal [52][53][54]. Sometimes both these mechanisms are also reported where nature of inhibitors reported as cathodic, anodic, or mixed type [55][56][57]. The inhibitor normally deposited as a monolayer above the metal considered as Langmuir adsorption model [58][59][60].…”

Formamidine-Based Thiuram Disulfides as Efficient Inhibitors of Acid Corrosion of Mild Steel: Electrochemical, Surface, and Density Functional Theory/Monte Carlo Simulation Studies

“…These compounds are also used in vulcanizing synthetic rubber. 15 As per corrosion studies, Ousslim et al 16 evaluated the mitigation of mild steel corrosion in 3.9 M HCl using bis(1-benzylpiperazine)thiuram disulfide and achieved an inhibition efficiency of 91.2% at 10 –3 M. In a similar report, the team assessed the inhibitory performance of three piperidine compounds including bis(4-benzylpiperidine)thiuram disulfide (P2) for mild steel degradation in 5.5 M H 3 PO 4 . At elevated concentration, P2 behaved as a predominant cathodic inhibitor and inhibited corrosion to the tune of 96% at 1 mM concentration at 298 K. 17 The inhibitive effect of three disulfides flavoring agents (PPD, DBD, and DAD) on copper in 0.5 M H 2 SO 4 was investigated via electrochemical and computational techniques by Tan et al 18 The study reported excellent inhibition efficacies of 98.5% (PPD), 92.10% (DBD), and 91.50% (DAD) with a maximum concentration of 5 mM at 298 K. Recently, an extensive study was conducted on the corrosion protection of cobalt in alkaline solution using two disulfide compounds, 2,2-dibenzamidodiphenyl disulfide and 3,3-dithiodipropionic acid.…”

“…These compounds are also used in vulcanizing synthetic rubber . As per corrosion studies, Ousslim et al evaluated the mitigation of mild steel corrosion in 3.9 M HCl using bis­(1-benzylpiperazine)­thiuram disulfide and achieved an inhibition efficiency of 91.2% at 10 –3 M. In a similar report, the team assessed the inhibitory performance of three piperidine compounds including bis­(4-benzylpiperidine)­thiuram disulfide (P2) for mild steel degradation in 5.5 M H 3 PO 4 . At elevated concentration, P2 behaved as a predominant cathodic inhibitor and inhibited corrosion to the tune of 96% at 1 mM concentration at 298 K .…”