Effect of Helichrysum italicum on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

The aqueous extract of the Helichrysum italicum leaves (HI) is tested as a corrosion inhibitor of an iron in a simulated acid rain using potentiodynamic polarisation, cyclic voltammetry and electrochemical impedance spectroscopy. Results of all electrochemical methods indicate an increase of a corrosion inhibition efficiency of the iron with the HI extract concentration. Maximum inhibition efficiency (~ 50 %) is obtained at 2.0 g L–1 HI extract. The inhibitive action is assumed to occur via an adsorption of the HI extract on the iron surface. Results indicate that the adsorption process is spontaneous and follows the Freundlich adsorption isotherm. According to the calculated ΔG value (~ 15 kJ mol–1), the corrosion inhibition of the iron occurs predominantly via a physisorption of the HI extract. The concentration of iron ions released into a solution, measured by atomic absorption spectrometry, is in accordance with the electrochemical results.

Download Full-text

Corrosion Inhibition of Mild Steel in Acidic Media by N-[(3,4-Dimethoxyphenyl)Methyleneamino]-4-Hydroxy-Benzamide

Journal of Bio- and Tribo-Corrosion ◽

10.1007/s40735-020-00439-7 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Kashmitha Muthamma ◽

Preethi Kumari ◽

M. Lavanya ◽

Suma A. Rao

Keyword(s):

Dft Calculations ◽

Mild Steel ◽

Corrosion Inhibition ◽

Density Functional ◽

Surface Characterization ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Corrosion Behaviour ◽

Low Carbon ◽

Acid Media

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.

Download Full-text

Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium

Coatings ◽

10.3390/coatings11010106 ◽

2021 ◽

Vol 11 (1) ◽

pp. 106

Author(s):

Akbar Ali Samsath Begum ◽

Raja Mohamed Abdul Vahith ◽

Vijay Kotra ◽

Mohammed Rafi Shaik ◽

Abdelatty Abdelgawad ◽

...

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Active Sites ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Film Formation ◽

Protective Film ◽

Surface Protection ◽

Tafel Polarization ◽

Spilanthes Acmella

In the present study, the corrosion inhibition effect of Spilanthes acmella aqueous leaves extract (SA-LE) on mild steel was investigated in 1.0 M HCl solution at different temperature using weight loss, Tafel polarization, linear polarization resistance (LPR), and electrochemical impedance (EIS) measurements. Adsorption of inhibitor on the surface of the mild steel obeyed both Langmuir and Temkin adsorption isotherms. The thermodynamic and kinetic parameters were also calculated to determine the mechanism of corrosion inhibition. The inhibition efficiency was found to increase with an increase in the inhibitor concentration i.e., Spilanthes acmella aqueous leaves extract, however, the inhibition efficiency decreased with an increase in the temperature. The phytochemical constituents with functional groups including electronegative hetero atoms such as N, O, and S in the extract adsorbed on the metal surface are found responsible for the effective performance of the inhibitor, which was confirmed by Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet–visible spectroscopic (UV-Vis) studies. Protective film formation against corrosion was confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle studies. The result shows that the leaves extract acts as corrosion inhibitor and is able to promote surface protection by blocking active sites on the metal.

Download Full-text

Interaction between Sodium Molybdate and FSWed Wled of 5083 Effected by Time

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.699.645 ◽

2013 ◽

Vol 699 ◽

pp. 645-649

Author(s):

Chang Bin Shen

Keyword(s):

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electrochemical Corrosion ◽

Sodium Molybdate ◽

Impedance Spectra ◽

Electrochemical Impedance Spectra ◽

Friction Stir ◽

Base Materials ◽

Corrosion Behaviors ◽

5083 Aluminum Alloy

Similar welds composed of 5083 were produced by friction stir welding. In the solution of 0.2 M NaHSO3 and 0.6 M NaCl, with the addition of a given concentration sodium molybdate as the inhibitor, the electrochemical corrosion behaviors of the friction stir welds (FSW) and 5083 were comparatively investigated by potentiodynamic polarization curve tests and electrochemical impedance spectra (EIS) at the ambient temperature for different test periods. The results indicated that : with the extension of period, the inhibition efficiencies (IE) for both the weld and 5083 base materials enhanced, at the same period, the inhibition efficiency (IE) for the weld was beyond that for 5083 base materials, sodium molybdate may be thought of as an effective inhibitor for 5083 aluminum alloy, the interaction between inhibitor and weld is stronger than that between inhibitor and base materials.

Download Full-text

Investigation of corrosion inhibition of C38 steel in 5.5 M H3PO4 solution using Ziziphus lotus oil extract: an application model

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-02-2018-1901 ◽

2019 ◽

Vol 66 (1) ◽

pp. 121-126 ◽

Cited By ~ 1

Author(s):

Walid Belmaghraoui ◽

Aimad Mazkour ◽

Hicham Harhar ◽

Mourad Harir ◽

Souad El Hajjaji

Keyword(s):

Carbon Steel ◽

Corrosion Inhibition ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electric Circuit ◽

Oil Composition ◽

Content Type ◽

Tafel Polarization ◽

Chemical Content ◽

Oil Extract

Purpose This study aims to investigate the corrosion inhibition effect of extracted oil from Ziziphus lotus fruit on corrosion of C38 carbon steel in 5.5 M H3PO4 solution using potentiodynamic polarization and impedance techniques. Design/methodology/approach Oil composition was determined using gas chromatography, and the results showed that oleic and palmitic acids present approximately 84.0 per cent of its total chemical content. Electrochemical impedance spectroscopy (EIS) data were analyzed by adapting it to a well-developed electric circuit model. The inhibition efficiency of Z. lotus oil was calculated and compared using Tafel polarization and EIS. Findings Accordingly, the oil extract was found to act as an anodic type inhibitor. Furthermore, inhibition efficiency of Z. lotus oil extract increase with oil concentrations and achieve approximately 70.5 per cent at 3 g/L solution of Z. lotus oil. Originality/value The results obtained from different tested methods were in line, and the oil was able to reduce significantly the kinetics of the corrosion process of C38 carbon steel.

Download Full-text

Use of Salvia hispanica as an eco-friendly corrosion inhibitor for bronze in acid rain

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-02-2017-1760 ◽

2017 ◽

Vol 64 (6) ◽

pp. 654-663 ◽

Cited By ~ 2

Author(s):

A.K. Larios-Galvez ◽

J. Porcayo-Calderon ◽

V.M. Salinas-Bravo ◽

J.G. Chacon-Nava ◽

Jose Gonzalo Gonzalez-Rodriguez ◽

...

Keyword(s):

Acid Rain ◽

Corrosion Inhibitor ◽

Electrochemical Impedance ◽

Electrochemical Techniques ◽

Simulated Acid Rain ◽

Salvia Hispanica ◽

Content Type ◽

Green Corrosion Inhibitor ◽

New Information ◽

Practical Implications

Purpose The purpose of this research paper was to investigate the use of methanolic extract of Salvia hispanica (S. hispanica) as a green corrosion inhibitor for bronze in a simulated acid rain solution. Design/methodology/approach Extract of S. hispanica was used as a green corrosion inhibitor for bronze in simulated acid rain solution. Electrochemical techniques such as potentiodynamic polarization curves, electrochemical impedance spectroscopy and electrochemical noise were used. Parameters such as polarization, charge transfer and noise resistance (Rp, Rct and Rn, respectively) were calculated. Findings Results showed that the extract acts as a good, anodic type of inhibitor. The inhibitor efficiency increased with increasing its concentration up to 400 ppm, decreasing beyond this concentration. Efficiency also increased with an increase in the immersion time. The inhibition was due to the adsorption of components found in the S. hispanica extract following a Langmuir adsorption isotherm. Practical implications S. hispanica extract can be used as a corrosion inhibitor for bronze in acid rain solution. Originality/value This study provides new information on the inhibition features of S. hispanica under specific conditions. This eco-friendly inhibitor could find applications to protect bronze exposed to polluted urban atmospheres.

Download Full-text

Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Coatings ◽

10.3390/coatings9100649 ◽

2019 ◽

Vol 9 (10) ◽

pp. 649 ◽

Cited By ~ 1

Author(s):

Xiangyu Lu ◽

Sichen Sun ◽

Qiqi Fan ◽

Xiangjun Pei ◽

Yuchao Dun ◽

...

Keyword(s):

Acid Rain ◽

Cathodic Protection ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Open Circuit ◽

Simulated Acid Rain ◽

Protective Film ◽

Az91d Alloy ◽

Testing Environment ◽

Protective Performance

Mg-rich primer (MRP) containing aluminum tri-polyphosphate functions via a galvanic mechanism to protect AZ91D alloy from corrosion in the 3 wt % NaCl solution. However, its protective performance can be strongly affected by the testing environment. Therefore, it is important to investigate the performance of the primer on magnesium alloys in an acid rain environment. In the present study, the protective performance of MRP with or without aluminum tri-polyphosphate was investigated via open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) in the simulated acid rain. Compared to the primer without aluminum tri-polyphosphate, the MRP containing aluminum tri-polyphosphate pigments exhibited better protective performance in the simulated acid rain condition. In the initial stage, the acidic condition prompted the aluminum tri-polyphosphate pigments to release phosphates and H+ to form magnesium phosphates on Mg particles, retarding their consumption rate. The Mg-rich primer with aluminum tri-polyphosphate can provide cathodic protection to AZ91D alloy for about 49 days in the simulated acid rain solution. Simultaneously, the corrosion products of Mg particles, magnesium oxides and phosphates, precipitated on the Mg particles and improved the stability of the primer. In addition, a protective film, consisting of magnesium oxides and phosphates, formed on the AZ91D substrate. Consequently, all these factors contributed to the long cathodic protection and improved corrosion resistance of MRP containing aluminum tri-polyphosphate in the simulated acid rain.

Download Full-text

Corrosion Inhibition of Mild Steel in Acid Solution by 3,4,5-Trimethoxyphenyl-2-imidazolines

E-Journal of Chemistry ◽

10.1155/2011/439234 ◽

2011 ◽

Vol 8 (2) ◽

pp. 671-679 ◽

Cited By ~ 2

Author(s):

D. Nalini ◽

R. Rajalakshmi ◽

S. Subhashini

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Mixed Mode ◽

Anodic Polarization ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Langmuir Adsorption Isotherm ◽

Sem Images ◽

Acid Media ◽

Langmuir Adsorption

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

Download Full-text

Corrosion behaviour of superplastic Zn–Al alloys in simulated acid rain

Corrosion Science ◽

10.1016/j.corsci.2012.03.013 ◽

2012 ◽

Vol 59 ◽

pp. 229-237 ◽

Cited By ~ 29

Author(s):

Lijing Yang ◽

Yangming Zhang ◽

Xuduo Zeng ◽

Zhenlun Song

Keyword(s):

Acid Rain ◽

Corrosion Behaviour ◽

Al Alloys ◽

Simulated Acid Rain

Download Full-text

The Roles of Alkyl Branches of Ionic Liquid in the Corrosion Resistance of Pb/Sb/Sn Grids Alloy in Lead-Acid Battery

International Journal of Electrochemistry ◽

10.4061/2011/787905 ◽

2011 ◽

Vol 2011 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Behzad Rezaei ◽

Ali Asghar Ensafi ◽

Ahmad Reza Taghipour Jahromi

Keyword(s):

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Corrosion Behaviour ◽

Electrochemical Behaviour ◽

Lead Acid Battery ◽

Reverse Effect ◽

Adsorption Model ◽

Peak Potential ◽

Ammonium Hydrogen ◽

Lead Acid

This paper describes the effects of ionic liquids (ILs) including mono, bicyclohexyl, and tetrahexyl ammonium hydrogen sulphate on the corrosion behaviour of Pb/Sb/Sn grids alloy of lead-acid battery with Pb, Sb (1.66 wt%), and Sn (0.24 wt%). Electrochemical behaviour has been investigated using Tafel plots and electrochemical impedance spectroscopy with various concentrations of ILs as electrolyte additives in 4.0 mol⋅L-1sulphuric acid. The obtained results indicated that, by increasing number of alkyl or cycloalkyl branches in ILs, the corrosion rate of the lead alloy decreases, whereas inhibition efficiency shows a reverse effect. In the presence of all ILs in different concentrations, conversion current of PbSO4to PbO2(iaandic) increases, while the reversibility, deduced from peak potential differences, decreases. Also, the effect of ILs adsorption model on the corrosion behaviour of electrode was proposed.

Download Full-text