Adsorption and corrosion inhibition of mild steel in acidic media by expired pharmaceutical drug

Geethamani, P.; Kasthuri, P. K.

doi:10.1080/23312009.2015.1091558

Cited by 41 publications

(17 citation statements)

References 22 publications

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“…This general corrosion also called as a uniform attack is the most common form of corrosion. It is normally characterized by a chemical or electrochemical reaction which proceeds uniformly over the entire exposed surface or over a large area [19]. The metal becomes thinner and eventually fails.…”

Section: General Corrosionmentioning

confidence: 99%

Corrosion Inhibitors

Palanisamy¹

2019

Corrosion Inhibitors

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Corrosion is a natural process driven by energy consideration. Inhibition is a preventive measure against corrosive attack on metallic materials. Corrosion inhibitors have been frequently studied, since they offer simple solution for protection of metals against corrosion in aqueous environment. Mineral acids like hydrochloric and sulfuric acids are most widely used in pickling baths to remove the metal oxides formed on the surface. The multidisciplinary aspect of corrosion problems combined with the distributed responsibilities associated with such problems only increase the complexity of the subject. Inhibitors are used in industrial and commercial processes to minimize both the metal loss and acid consumption.

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Section: General Corrosionmentioning

confidence: 99%

Corrosion Inhibitors

Palanisamy¹

2019

Corrosion Inhibitors

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“…The corrosion inhibition property of expired drug on the metal surface was previously supported by many authors. Authors Geethamani and Kasthuri [23] selected expired Ambroxol drug and studied their corrosion inhibition property on the mild steel surface in the 1 M HCl solution. The authors obtained maximum protection efficiency 60.52% with concentration of 9.0 (v/v %) by potentiodynamic polarization technique.…”

Section: Comparisonmentioning

confidence: 99%

Expired Lorazepam Drug: A Medicinal Compound as Green Corrosion Inhibitor for Mild Steel in Hydrochloric Acid System

Raghavendra¹

2019

Chemistry Africa

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The present study explores the green corrosion inhibition property of expired Lorazepam tablet on the mild steel (MS) in 3M HCl solution using gravimetric (mass loss), atomic absorption, Tafel plot, electrochemical impedance, quantum chemical, and scanning electron microscopy (SEM) studies. It is found that; expired Lorazepam tablet shows the robust corrosion inhibition property (protection efficiency = 90%) on the MS at 0.4 g/L of expired Lorazepam drug (observed from the gravimetric studies) at 333 K with a contact time of 3 h. The significant enhancement in the protection performance of the expired Lorazepam tablet has been observed by atomic absorption spectroscopy technique. The results of Tafel plots show that, the presence of the expired Lorazepam tablet of different concentration decreases the both cathodic and anodic processes at MS in the 3M HCl solution by blocking the MS active sites and behave as a mixed mode corrosion inhibitor. Electrochemical impedance studies show that, increase in the amounts of expired Lorazepam tablet increases the charge transfer process at MS-HCl interface. The electron transfer nature of the expired Lorazepam tablet on the MS surface was confirmed from the Quantum chemical studies. The adsorbed invisible layer over the surface of MS was scrutinized by scanning electron microscopy technique.

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“…Also, this pharmaceutical product is considered a highly effective system to inhibit the corrosion processes of steel in different media due to the presence of heteroatoms such as N and O, that have high adsorption affinity. The adsorption of Trimethoprim compounds on the carbon steel surface is achieved by the interaction between lone electron pairs of heteroatoms and d-orbitals of the metal atoms [1][2][3][4][5][6][7][8][9][10][11]. The use of inorganic inhibitors due to the decomposing of organic compounds with temperature and time [12] for this reason the prepared complexes of TM used as inhibitors [13,14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Trimethoprim metal complexes used as corrosion inhibitors for carbon steel in acid media

2019

Int. J. Corros. Scale Inhib.

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Trimethoprim (TM) is an antibiotic used to treat bacterial infections as well as it is a heterocyclic compound, whose structure consists of 1,2,3-trimethoxybenzene and pyrimidine-2,4-diamine, therefore it can be used as a corrosion inhibitor due to easy production and low price on carbon steel in acidic media by adsorption process. Cr(III), Mn(II), Co(II), Ni(II) and Cu(II) complexes of Trimethoprim were synthesized and also used as a corrosion inhibitor. The Trimethoprim drug and its complexes were characterized by different spectroscopic methods: Ultraviolet-visible, Fourier transform infrared, conductivity measurements, thermal analysis (TG) and magnetic susceptibility measurement. Adsorption process can be attributed to changes in concentration of inhibitors with the acidity of a solution as well as the surface of the metal (carbon steel). The results of the experiment have shown the coordination of the Trimethoprim drug with the transition metal ions through nitrogen of pyrimidinyl ring so that square planar geometry was suggested for Mn(II), Ni(II), Cu(II) complexes while the Cr(III), Co(II) complexes have an octahedral geometry and these complexes have electrolyte properties. Corrosion inhibition on carbon steel was studied using weight loss method in one molar hydrochloric acid solution by organic inhibitor Trimethoprim and inorganic inhibitors (complexes) at different concentrations with different periods of time. The measurements have shown that Trimethoprim reduced the corrosion of the carbon steel surface and also the inhibition efficiency of the complexes increased with increasing concentration. The inhibition efficiency followed the order Co > Cu > Cr in one molar acidic solution.

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Adsorption and corrosion inhibition of mild steel in acidic media by expired pharmaceutical drug

Cited by 41 publications

References 22 publications

Corrosion Inhibitors

Corrosion Inhibitors

Expired Lorazepam Drug: A Medicinal Compound as Green Corrosion Inhibitor for Mild Steel in Hydrochloric Acid System

Synthesis and characterization of Trimethoprim metal complexes used as corrosion inhibitors for carbon steel in acid media

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