Contribution of the electrochemical impedance measurement technique to zinc corrosion inhibition studies in acid media

1989 ◽  
Vol 40 (11) ◽  
pp. 634-641 ◽  
Author(s):  
M. Troquet ◽  
J. Pagetti
2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Kashmitha Muthamma ◽  
Preethi Kumari ◽  
M. Lavanya ◽  
Suma A. Rao

Abstract Mild steel (a low carbon steel) is an affordable engineering material used for many purposes in various environments including mild acidic environment with some precautions. The corrosion behaviour of mild steel (MS) in 0.5 M H2SO4 and 0.5 M HCl, in the temperature range (303–323 K) without and with the inhibitor N-[(3,4-dimethoxyphenyl) methyleneamino]-4-hydroxy-benzamide (DMHB), was investigated using Potentiodynamic polarization and Electrochemical impedance spectroscopy (EIS) techniques supplementing with surface characterization study using scanning electron microscope (SEM) and atomic force spectroscopy (AFM). Experimental observations were found to be in agreement with Density functional theory (DFT) calculations. The inhibition efficiency increases with increase in DMHB concentration and showed maximum inhibition efficiency of 86% in 0.5 M H2SO4 and 81% in 0.5 M HCl, respectively, at concentration of 3 × 10─3 M at 303 K. The inhibition efficiency of DMHB obtained relatively at its lower concentration (3 × 10─3 M) compared to other reported related compounds confirms its potential towards corrosion inhibition. The variation in the kinetic and thermodynamic parameters indicated physisorption of DMHB on MS and its mixed type inhibitive action followed Langmuir’s isotherm model. DFT calculations go along with the experimental results, signifying the potential corrosion inhibition behaviour of DMHB for MS in both the acid media.


2015 ◽  
Vol 76 (13) ◽  
Author(s):  
Bishir Usman ◽  
Hasmerya Maarof ◽  
Hassan H. Abdallah ◽  
Rosmahida Jamaludin ◽  
Mohamed Noor Hasan ◽  
...  

Corrosion inhibition of mild steel in 0.5M H2SO4 at 30oC with thiophene-2- ethylamine (TEA) as inhibitor has been assess by quantitative structure activity relation (QSAR) model and quantum chemical calculations. The results were evaluated using weight loss and electrochemical methods such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The results showed good performance of TEA in corrosion protection which behaves as mixed inhibitor from PDP. The micrograph from FESEM and EDX dot mapping showed that the inhibitor adsorbed onto the metal surface with different distribution for S, C and N atoms which indicate less damage on the metal surface in the presence of TEA.


2011 ◽  
Vol 8 (2) ◽  
pp. 671-679 ◽  
Author(s):  
D. Nalini ◽  
R. Rajalakshmi ◽  
S. Subhashini

A heterocyclic imidazoline, 3,4,5-trimethoxyphenyl-2-imidazolines (TMP2I) was tested for its corrosion inhibition in 0.5 M H2SO4and 1 M HCl using weight loss, Tafel polarisation and electrochemical impedance techniques. The results show that the inhibition efficiency increases with the increase in concentration of TMP2I and the higher efficiency of about 98% is obtained in both the acid media at 20 ppm. The adsorption of TMP2I obeys Langmuir adsorption isotherm and occurs spontaneously. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of TMP2I at 300C reveal that it is a mixed type of inhibitor. Electrochemical impedance studies reveal that the system follows mixed mode of inhibition. The surface morphology of the mild steel specimens was evaluated using SEM images


RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28743-28761 ◽  
Author(s):  
Lutendo C. Murulana ◽  
Mwadham M. Kabanda ◽  
Eno E. Ebenso

Corrosion inhibition studies of mild steel in aqueous HCl by some sulphonamides have been investigated using weight loss, potentiodynamic polarization (PDP), Electrochemical Impedance Spectroscopy (EIS) and Density Functional Theory (DFT).


2021 ◽  
pp. 67-80
Author(s):  
K. Ragi ◽  
Joby Thomas Kakkassery ◽  
Vinod P. Raphael ◽  
Binsi M. Paulson ◽  
Reeja Johnson

The corrosion inhibition efficiency of the Schiff base N,N’-(5,5-dimethylcyclohexane-1,3-diylidene)dianiline (DmChDa) on mild steel in 1M HCl and 0.5M H2SO4 was evaluated using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization and electrochemical noise measurement. Experimental results established that DmChDa possess relatively high corrosion inhibition capacity. Langmuir and El-Awady adsorption isotherms were obeyed by the Schiff base in 1M HCl and 0.5M H2SO4 respectively. SEM analysis showed that DmChDa was adsorbed on the steel surface during corrosion inhibition. The variation of metal dissolution with temperature was also examined using gravimetric study.


2017 ◽  
Vol 46 (1) ◽  
pp. 20 ◽  
Author(s):  
Roland Loto

La corrosión de acero dulce es responsable de pérdidas económicas e industriales debido a su deterioro acelerado. Los derivados sintetizados de tiourea y aldehídos fenólicos con heteroátomos inhiben la corrosión por adsorción sobre el acero mediante la formación de enlaces fuertes. Por tanto, se estudiaron las propiedades de inhibición de la corrosión electroquímica de la mezcla combinada de 1,3-difenil-2-tiourea y 4-hidroxi-3-metoxibenzaldehído sobre acero dulce en medios de H2SO4 y HCl 1 M mediante análisis de pérdida de peso, método de polarización potenciodinámica, microscopía óptica y espectroscopia IR. Los resultados mostraron que la mezcla inhibe eficazmente la corrosión del acero dulce en ambas soluciones con una eficacia de inhibición óptima de 97,4% y 97,47% en H2SO4, mientras que los valorescorrespondientes al HCl son 94,71% y 89,73%. Los cálculos termodinámicos demostraron que el compuesto quimiosorbido sobre la superficie de acero bloquea la difusión de aniones corrosivos. Las imágenes micro-analíticas confirmaron la efectiva propiedad de inhibición del compuesto y su presencia en la topografía superficial del acero. Los espectros infrarrojos revelaron la presencia de los grupos funcionales del compuesto orgánico responsable de la inhibición de la corrosión. La adsorción del compuesto se dedujo siguiendo las isotermas de adsorción de Langmuir, Frumkin y Freundlich.


2011 ◽  
Vol 317-319 ◽  
pp. 1852-1857
Author(s):  
Lian Yue Hu ◽  
Sheng Tao Zhang ◽  
Xiao Hong Huang ◽  
Hong Hao Hu

The effect of tinidazole on the zinc corrosion in 0.1mol/L KOH solution has been studied by polarization curves, electrochemical impedance spectroscopy (EIS), SEM, and weight loss measurements. It has been shown that tinidazole act as an anodic inhibitor, can effectively restrain the process of the anodic oxidation of zinc.The highest value of inhibition efficiency is 89.39% at 50mg/L concentration.


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