The corrosion behaviour and hydrogen evolution reaction of Fe in non-aqueous formic acid

Sekine, Isao; Ohkawa, Hideki; Handa, Takashi

doi:10.1016/0010-938x(82)90098-1

Cited by 26 publications

(11 citation statements)

References 18 publications

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“…Despite the importance of organic acids in industry, few corrosion studies of these acids [5][6][7][8] have been made. However, at high temperatures, the acids can dissociate, forming more aggressive ions that can cause faster corrosion than might otherwise be expected.…”

Section: Introductionmentioning

confidence: 99%

Thiazoles as corrosion inhibitors for mild steel in formic and acetic acid solutions

Quraishi

Sharma

2005

J Appl Electrochem

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2-(N,N-dimethylamino) benzylidene imino-4-(4-methyl phenyl)-1,3-thiazole (DIMPT), 2-benzylidene imino-4-(4-methyl phenyl)-1,3-thiazole (BIMPT), 2-salicylidene imino-4-(4-methyl phenyl)-1,3-thiazole (SIMPT) and 2-cinnamylidene imino-4-(4-methyl phenyl)-1,3-thiazole (CIMPT) were synthesized in the laboratory and their influence on the inhibition of corrosion of mild steel in 20% formic acid and 20% acetic acid was investigated by weight loss and potentiodynamic polarization techniques. The inhibition efficiency of these compounds was found to vary with their nature and concentration, temperature, immersion time and acid concentration. The values of activation energy and free energy of adsorption of the thiazoles were calculated to investigate the mechanism of corrosion inhibition. The adsorption of all the thiazoles on mild steel surface was found to obey Langmuir adsorption isotherm. The potentiodynamic polarization result revealed that the compounds studied are mixed type inhibitors. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition.

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Section: Introductionmentioning

confidence: 99%

Thiazoles as corrosion inhibitors for mild steel in formic and acetic acid solutions

Quraishi

Sharma

2005

J Appl Electrochem

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“…EIS has been successfully applied to monitor corrosion systems for more than three decades, since the technique is capable of giving information on the corrosion mechanisms involving small amplitude signals without disturbing the properties of the system and the applicability to low-conductivity environments. [2][3][4] The two fundamental difficulties in the application of EIS to the field monitoring of corrosion are the time involved in obtaining a full-impedance diagram and the interpretation of the EIS data.…”

Section: Discussionmentioning

confidence: 99%

Discussion:Comments on the Role of Electrochemical Impedance and Electrochemical Noise in Monitoring Corrosion Inhibitors in Oil and Gas Pipelines

Sastri¹

2005

CORROSION

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discussionRecently, a publication appeared with the title "Comparison of Techniques for Monitoring Corrosion Inhibitors in Oil and Gas Pipelines," 1 in which the authors used weight loss, linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), electrochemical noise (EN), and hydrogen probes to monitor corrosion inhibitors in oil and gas pipelines. The conclusions reached by the authors are such that the weight loss data gave 90% MRT (most repeated trend), LPR gave ~70% MRT, EIS gave 33% MRT, and EN gave 90% MRT. The authors also state that reliable EIS data could not be obtained on localized corrosion. The authors also point out that collection of EIS data requires a long measurement time, the need to get data at 20 frequencies, and the failure to model the system in terms of an equivalent circuit.The following are the comments on the use of EIS and EN in monitoring corrosion. EIS has been successfully applied to monitor corrosion systems for more than three decades, since the technique is capable of giving information on the corrosion mechanisms involving small amplitude signals without disturbing the properties of the system and the applicability to low-conductivity environments. 2-4 The two fundamental difficulties in the application of EIS to the field monitoring of corrosion are the time involved in obtaining a full-impedance diagram and the interpretation of the EIS data.The difficulties were overcome by a method consisting of finding the geometric center of an arc formed by three successive data points on a complex impedance diagram. 5-6 This analysis was further developed by permuting the data points involved in the projection of centers to obtain a population of projected centers, which could be used in evaluating the parameters behind an RC behavior. [7][8] Field monitoring of corrosion using EIS and electrochemical noise was done at two sites, consisting of the evaluation of inhibitors in oil pipelines and the evaluation of biocides in reducing microbiologically induced corrosion. The results of the field tests have been documented in the literature. 9-10 The results obtained from the field tests showed that the two inhibitors tested in the oilfield operations were equally effective. Some data are given in Table 1.The field test data in Table 2 show that the results obtained by potentiodyne technique are anomalous, and the effect of added biocide is clearly evident from the data obtained from weight-loss and EIS techniques.

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“…Thus, EIS has been applied successfully to study the corrosion of Fe and carbon (C) steel in neutral waters [3][4] or deoxygenated formic acid. 5 Even with many advantages over other electrochemical techniques, EIS remained difficult to use for field corrosion monitoring until two important obstacles were overcome. The first of these obstacles was the time required to obtain a full impedance diagram.…”

Section: Introductionmentioning

confidence: 99%

On-Line Corrosion Monitoring with Electrochemical Impedance Spectroscopy

Roberge¹,

Sastri²

1994

CORROSION

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Electrochemical impedance spectroscopy (EIS) has been found to be a rapid and accurate technique for measuring corrosion rates in the most difficult situations and for yielding information concerning the occurrence of localized corrosion. When used in the absence of potentiostatic control, the technique carries less instrumental overhead, and the danger of damaging the probe by accidental polarization is reduced. Results from two field tests were presented to illustrate the advantages of using EIS for online monitoring of general and localized corrosion.

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The corrosion behaviour and hydrogen evolution reaction of Fe in non-aqueous formic acid

Cited by 26 publications

References 18 publications

Thiazoles as corrosion inhibitors for mild steel in formic and acetic acid solutions

Thiazoles as corrosion inhibitors for mild steel in formic and acetic acid solutions

Discussion:Comments on the Role of Electrochemical Impedance and Electrochemical Noise in Monitoring Corrosion Inhibitors in Oil and Gas Pipelines

On-Line Corrosion Monitoring with Electrochemical Impedance Spectroscopy

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