scholarly journals Polyaniline/chitosan as a corrosion inhibitor for mild steel in acidic medium

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 9211-9217 ◽  
Author(s):  
Peipei Kong ◽  
Huixia Feng ◽  
Nali Chen ◽  
Yong Lu ◽  
Shiyou Li ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Acidic Medium ◽  
Metal Corrosion ◽  
Electrochemical Measurements ◽  
One Pot ◽  
Synthesis Route ◽  
Inhibition Performance

One-pot synthesis route for PANI/CTS preparation. The inhibition performance of PANI/CTS on metal corrosion in 0.5 M HCl was studied using electrochemical measurements and quantum chemical calculations.

EXPERIMENTAL AND QUANTUM CHEMICAL CALCULATIONS ON CORROSION INHIBITION OF MILD STEEL BY TWO FURAN DERIVATIVES

2016 ◽  
Vol 78 (6-12) ◽  
Author(s):  
Abdo M. Al-Fakih ◽  
Hassan H. Abdallah ◽  
Hasmerya Maarof ◽  
Madzlan Aziz
Keyword(s):  
Mild Steel ◽  
Quantum Chemical Calculations ◽  
Corrosion Inhibition ◽  
Quantum Chemical ◽  
Density Functional ◽  
Energy Gap ◽  
Molecular Structures ◽  
Furan Derivatives ◽  
Inhibition Performance ◽  
Quantum Parameters

Two furan derivatives namely 5-methylfurfurylamine (MFA) and furfurylamine (FAM) were investigated as corrosion inhibitors for mild steel in 1 M HCl. The corrosion inhibition efficiencies (IE) were measured at 0.005M of the inhibitors using electrochemical potentiodynamic polarization measurements. The studied furan derivatives inhibit mild steel corrosion in acidic medium. The MFA shows higher inhibition efficiency of 84.77% compared to FAM of 41.75%. Quantum chemical calculations were performed at the B3LYP/6-311++G(d,p) level of density functional theory (DFT). Several quantum parameters were calculated to study the correlation between the molecular structures and the corrosion inhibition performance of the inhibitors. The MFA inhibitor shows higher HOMO energy, softness (S), fraction of electrons transferred (ΔN), and lower energy gap (∆E) compared to the FAM. This result indicates a better corrosion inhibition performance of the MFA inhibitor. The results show that the calculated values of the quantum parameters using DFT calculations are consistent with the experimental findings.  

N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized polyaniline: a corrosion inhibitor for mild steel

2018 ◽  
Vol 65 (2) ◽  
pp. 146-151 ◽  
Author(s):  
Mohd Rashid ◽  
Umesh S. Waware ◽  
Afidah A. Rahim ◽  
A.M.S. Hamouda
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Acidic Medium ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
High Dispersion ◽  
Ammonium Bromide ◽  
Content Type

Purpose The purpose of this study is to compare the inhibitive effect of polyaniline (PAni) and N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized PAni in a hydrochloric acid (HCl) medium. Design/methodology/approach PAni has been deposited potentiodynamically on mild steel in the presence of CTAB as a stabilizing agent to achieve high corrosion inhibition performance by the polymer deposition. The corrosion inhibition studies of CTAB-stabilized PAni inhibitor in 0.1 M HCl acidic solution was carried out by electrochemical methods, namely, open-circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy technique. Findings The results of electrochemical studies have shown that the CTAB-stabilized PAni inhibitor has higher corrosion efficiency than PAni on mild steel in 0.1 M HCl solution. The maximum per cent efficiency evaluated using the potentiodynamic polarization method is approximately 91.9. Originality/value CTAB-stabilized PAni has never been studied as a corrosion inhibitor for mild steel in an acidic medium. The investigations demonstrate relatively the better corrosion inhibition efficiency and high dispersion of the polymer in the acidic medium.

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