2-Mercaptobenzimidazole as a copper corrosion inhibitor: Part I. Long-term immersion, 3D-profilometry, and electrochemistry

Abstract It is known that if unused drugs are improperly disposed, they can pollute the environment. Furthermore, researchers are still trying to find an environmentally friendly corrosion inhibitor. These factors lead to the possible application of unused pharmaceutical compounds as corrosion inhibitors. The feasibility of an anti-inflammatory, analgesic and antipyretic drug, ibuprofen, was evaluated as a potential copper corrosion inhibitor in synthetic acid rain solution. This investigation was performed by applying electrochemical and weight loss measurements and quantum chemical calculations. The results obtained by these techniques revealed the ability of ibuprofen to protect copper from corrosion. The inhibition efficiency of ibuprofen rises with increase in its concentration and can reach a value of 97.3%. The results of surface analysis of treated coupons by scanning electron microscopy and theoretical calculations are consistent with the experimental results.

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Corrosion behavior of carbon steel in chloride contaminated simulated concrete pore solution with carboxylate of benzoic acid and dimethylethanolamine

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-03-2016-1654 ◽

2017 ◽

Vol 64 (5) ◽

pp. 555-562 ◽

Cited By ~ 1

Author(s):

J.Z. Liu ◽

Jing Shun Cai ◽

L. Shi ◽

D. Zhao ◽

C.C. Chen ◽

...

Keyword(s):

Carbon Steel ◽

Benzoic Acid ◽

Corrosion Inhibitor ◽

Steel Surface ◽

Threshold Level ◽

Initial Time ◽

Inhibition Mechanism ◽

Content Type ◽

Chloride Threshold

Purpose The purpose of this study is to investigate the inhibition efficiency and mechanism of a specific carboxylate corrosion inhibitor which consists of benzoic acid and dimethylethanolamine on steel surface. Design/methodology/approach The performance of carbon steel influenced by this organic inhibitor under different concentration of Cl− and immersion time was studied by linear polarization resistance and electrochemical impedance spectroscopy in a simulated concrete pore (SCP) solution. The surface morphology and composition of steel was also analyzed by optical microscopy, SEM and EDS to investigate the effect of inhibitor on the pattern of the steel surface after long-term immersion. Findings Carboxylate of benzoic acid and dimethylethanolamine can increase the chloride threshold level and decrease the corrosion area of carbon steel in SCP solution with 0.6 mol/L Cl− even after 120 days exposure. The inhibition mechanism of inhibitor lies in quick adsorption and buffering effect at initial time then formed deposited layer on steel surface after long-term immersion in chloride-rich environment. Originality/value It demonstrated that the carboxylate corrosion inhibitor not only can improve the chloride threshold level for carbon steel but also effectively decrease the corrosion rate even in chloride-rich SCP solution after long-term immersion, which is different form the conventional amino alcohol.

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Electrochemical Investigation of Triadimenol as Corrosion Inhibitor for Copper in 0.5mol/L H2SO4 Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.830.81 ◽

2013 ◽

Vol 830 ◽

pp. 81-85

Author(s):

Song Song Li ◽

Wei He ◽

Zhi Hua Tao ◽

Shou Xu Wang

Keyword(s):

Sulfuric Acid ◽

Corrosion Inhibitor ◽

Electrochemical Impedance ◽

Polarization Measurement ◽

Electrochemical Investigation ◽

Copper Corrosion ◽

Inhibitor Concentration ◽

Mechanism Of Inhibition ◽

Eis Measurements ◽

Cathodic And Anodic Processes

This paper chose triadimenol as a corrosion inhibitor of copper in 0.5mol/L sulfuric acid. The properties of corrosion inhibition were investigated by the polarization measurement and electrochemical impedance spectroscopy (EIS). Polarization curves showed that both cathodic and anodic processes of copper corrosion were suppressed. The inhibiting efficiency increased as the increment of the inhibitor concentration and reached 86.7% at 50 mg/L. The results obtained from EIS measurements are in line with that obtained from potentiodynamic polarization. Finally, a mechanism of inhibition is proposed and discussed.

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