Electrochemical frequency modulation and inductively coupled plasma atomic emission spectroscopy methods for monitoring corrosion rates and inhibition of low alloy steel corrosion in HCl solutions and a test for validity of the Tafel extrapolation method

Amin, Mohammed A.; Rehim, Sayed S. Abd El; Abdel-Fatah, Hesham T. M.

doi:10.1016/j.corsci.2009.01.006

Cited by 150 publications

(38 citation statements)

References 49 publications

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“…The Nyquist plots show depressed semi-circles, having one capacitive loop. The analysis of Nyquist plots reveals that the corrosion process is mainly charge transfer controlled [19]. The diameter of the capacitive loops increases with increasing concentrations of inhibitors suggesting that both FA and EA act as efficient corrosion inhibitors for MS.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

“…Nowadays, researchers are mainly focusing on the use of non-toxic and ''green'' corrosion inhibitors, e.g., plant extracts and drugs to obviate the harmful effect of chemicals on environment [8][9][10]. Because of their non-toxic characteristics [18] and negligible negative impacts on the aquatic environment [19], drugs (chemical medicines) seem to be the ideal candidates to replace traditional toxic corrosion inhibitors [9]. A number of studies are available describing the application of drugs as efficient corrosion inhibitors [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Expired atorvastatin drug as corrosion inhibitor for mild steel in hydrochloric acid solution

et al. 2017

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The application of expired drugs as corrosion inhibitors provides a cost effective and environmentally benign alternative to otherwise tedious and costly disposal/ degradation process. In this context, we herein investigate the use of expired atorvastatin (EA) for corrosion inhibition of mild steel in 1 M HCl solution using weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (Tafel) methods. Fresh atorvastatin (FA) drug was also used for above studies for comparison purpose to understand whether there is any significant difference between the inhibition efficiency of the two after the expiration date of the drug. EIS analysis shows an increase in polarization resistance due to the adsorbed inhibitor molecules on metal surface. Potentiodynamic polarization indicates that both the EA and FA act as mixed-type inhibitors but predominantly behave as cathodic inhibitors. The adsorption of EA and FA on mild steel surface follows the Langmuir adsorption isotherm. SEM shows a smoother surface of mild steel in the presence of FA and EA drug in acidic solution. Both the fresh drug and its expired counterpart showed almost similar results in all the studies, thereby verifying the validity of the expired atorvastatin drug as a novel and efficient corrosion inhibitor for mild steel.

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Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Expired atorvastatin drug as corrosion inhibitor for mild steel in hydrochloric acid solution

et al. 2017

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“…The EDAXs survey spectra were used to determine the elements present on the mild steel surface before and after exposure to the inhibitor solution [28][29][30]. The objective of this section was to confirm the results obtained from chemical and electrochemical measurements that a protective surface film of inhibitor is formed on the mild steel surface.…”

Section: Energy Dispersive Analysis Of X-rays (Edaxs)mentioning

confidence: 92%

“…To understand the nature of the surface film in the absence and presence of inhibitors and the extent of corrosion of mild steel, the SEM micrographs of the surface are examined [28][29][30]. The SEM images of different magnification (×20) of mild steel specimen immersed in an aqueous containing 60 ppm Cl -for one day in the absence and presence of inhibitor system are shown in Fig.…”

Section: Sem Analysis Of Mild Steel Surfacementioning

confidence: 99%

Inhibition Effect of Copper Complex of 1-(8-Hydroxy Quinolin-2-yl- Methyl) Thiourea on the Corrosion of Mild Steel in Sodium Chloride Solution

Syed¹,

Abdul²,

Rajendran³

2014

TOMSJ

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Abstract:The Corrosion inhibition of an inhibitor namely Copper complex of 1-(8-hydroxy quinolin-2-yl-methyl) thiourea (Cu-HTF) which controls the corrosion of mild steel immersed in an aqueous solution containing 60 ppm Cl -has been investigated through electrochemical and mass loss method. The formulation consisting of 60 ppm of Cl -and 50 ppm of Cu-HTF offers good inhibition efficiency of 78 %. Polarization study shows that this formulation acts as a cathodic inhibitor.AC impedance spectra indicate that a protective film is formed on the mild steel surface. Fluorescence spectral analysis was used to detect the presence of iron-inhibitor complex. The surface morphology has been analyzed by FTIR, UV-Visible spectroscopy, Scanning Electron Microscope (SEM) and EDAX. Cu-HTF has the ability to prevent the growth of certain microorganisms such as E. coli, Streptococcus, Pseudomonas and Enterobacter.

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“…The most precise determination of the corrosion current density values is by the Tafel extrapolation when both the anodic and cathodic branches show linearity. However, it is also possible to make an accurate evaluation of the corrosion current densities if one of the branches of the polarization curves displays a sufficiently long linear tendency around the corrosion potential [24][25][26][27]. In fact, two rules of thumb should be applied when using Tafel extrapolation.…”

Section: Electrochemical Equipment and Measurementsmentioning

confidence: 99%

Influence of pH on the electrochemical behaviour of a duplex stainless steel in highly concentrated LiBr solutions

2011

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The objective is to study the influence of pH on the corrosion and passive behavior of duplex stainless steels (DSS) using potentiodynamic measurements, potentiostatic tests and electrochemical impedance spectroscopy (EIS).DSS are spontaneously passive in heavy brine LiBr solutions. Under potentiostatic conditions at applied anodic potentials within the passive domain an equivalent circuit with two time constants is the most suitable model to describe the corrosion mechanism in the interface electrolyte // passive film // metal. pH modifies the electrochemical properties of the passivity of the alloy in a 992 g / L LiBr solution reducing its resistance with the applied potential.

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Electrochemical frequency modulation and inductively coupled plasma atomic emission spectroscopy methods for monitoring corrosion rates and inhibition of low alloy steel corrosion in HCl solutions and a test for validity of the Tafel extrapolation method

Cited by 150 publications

References 49 publications

Expired atorvastatin drug as corrosion inhibitor for mild steel in hydrochloric acid solution

Expired atorvastatin drug as corrosion inhibitor for mild steel in hydrochloric acid solution

Inhibition Effect of Copper Complex of 1-(8-Hydroxy Quinolin-2-yl- Methyl) Thiourea on the Corrosion of Mild Steel in Sodium Chloride Solution

Influence of pH on the electrochemical behaviour of a duplex stainless steel in highly concentrated LiBr solutions

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