ISSN 2305-6894

2019, Vol. 8, Issue 1 (pp. 1-…)

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The influence of Co-Amoxiclav on the corrosion inhibition of mild steel in 1 N hydrochloric acid solution

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1 School of Mechanical Engineering, Vellore Institute of Technology [VIT], Vellore, 632014 India
2 Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology [VIT], Vellore, 632014 India

Abstract: The influence of an antibiotic Co-Amoxiclav is studied for use as a low cost and ecofriendly corrosion inhibitor for mild steel in acidic environment in particular to 1 N hydrochloric acid medium. The corrosion inhibition effect and the performance of the inhibitor has been extensively studied by weight loss studies, Tafel polarization experiments, electrochemical impedance spectroscopy and hydrogen permeation measurements. The dosage of the antibiotic was varied from 5×10–4 M to 15×10–4 M. It has been established that the inhibitor performed well and showed 88% inhibition efficiency at 15×10–4 M concentration of Co-Amoxiclav molecules. The electrochemical studies such as Potentiodynamic polarization proposes that the antibiotic viz., Co-Amoxiclav acted as a mixed type of inhibitor. The increased charge transfer resistance and decreased double layer capacitance obtained from electrochemical impedance spectroscopy confirmed that said antibiotic has performed as good inhibitor in 1 N hydrochloric acid medium. Hydrogen permeation measurements showed that the compound acts as cathodic inhibitor, but predominantly under mixed control. It has been noticed that a definite correlation exists between chemical and electrochemical studies for the inhibition action of Co-Amoxiclav molecules on the corrosion of mild steel in 1 N HCl medium. Diffused reflectance spectroscopy (DRS) studies established that only the mere adsorption of antibiotic on mild steel surface took place and not influence on the surface morphology. The adsorption of this compound on mild steel surface obeys Temkin’s adsorption isotherm.

Int. J. Corros. Scale Inhib., , 1, 1-12 PDF (1 206 K)
doi: 10.17675/2305-6894-2019-8-1-1

Mass transfer analysis considering gas phase diffusion and experimental verification for surface painting a waterborne MCI in concrete

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1 School of Civil Engineering, Yantai University, Yantai 264005, China
2 School of Materials Science and Technology, Southeast University, Nanjing 211189, China
3 Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Abstract: The mass transfer numerical model including the long-term gas phase diffusion of a waterborne migrating corrosion inhibitor (MCI, named PCI-2016) in concrete was investigated in this study. The PCI-2016 was prepared by using multi-compound and chelate-induced techniques. The concentrations of nitrogen in different thickness of cover concrete after surface-painted different amounts of PCI-2016 were calculated by this mass transfer model. The calculated data were basically consistent with the nitrogen contents tested by Kjeldahl method at interface between steel bar and mortar matrix. To verify the anticorrosion performance of painting PCI-2016 steel bars bedded in mortar specimens containing different content of NaCl painted with relevant amounts of PCI-2016 were also investigated by the linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). The results revealed that the Icorr of steel bar in the specimen containing 1.25% NaCl (wt. to cement) after painting with 5 g PCI-2016 for 3 days and 28 days decreased from 0.67 μA·cm–2 (before painting) to 0.25 μA·cm–2 and 0.06 μA·cm–2, respectively. The numerical analysis and test results supported that the gas phase transfer model is suitable to calculate the weight of PCI-2016 at the interface zone between steel bar and concrete, and the painted the certain amounts of PCI-2016 on the surface of mortar could show an identified repairing effect on the corrosive steel bar.

Int. J. Corros. Scale Inhib., , 1, 13-24 PDF (787 K)
doi: 10.17675/2305-6894-2019-8-1-2

Influence of Lavandula Dentata essential oil on the corrosion inhibition of carbon steel in 1 M HCl solution

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1 Materials Nanotechnology and Environment, Mohamed V University, Faculty of Science, 4 Av. Ibn Battouta, B.P. 1014 RP, M-10000 Rabat, Morocco
2 Chemistry of Natural Products, Faculty of Science and Technology, University of Corsica, UMR CNRS6134, Corsica, France

Abstract: Within this study we are concerned by the corrosion inhibition of the essential oil of Lavandula Dentata (EOLD) in carbon steel in 1 M hydrochloric acid solution, the investigation was performed using gravimetric method, Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic polarization measurements. The results of electrochemical techniques and gravimetric measurements revealed that the EOLD tested as inhibitor leads to a systematic reduction in the kinetics of steel corrosion processes. Potentiodynamic polarization study has shown that EOLD is inhibitor of a cathodic type. The effect of temperature on the corrosion behavior of carbon steel in the presence and absence of EOLD was studied in the temperature range from 303 K to 333 K. The findings about Electrochemical Impedance Spectroscopy revealed a frequency distribution of the capacitance, simulated as constant phase element. Inhibition efficiencies, determined by potentiodynamic polarization, electrochemical impedance spectroscopy and weight loss methods, are in good agreement. The extracted of EOLD, by hydrodistillation, is analyzed by gas chromatography (GC), indeed, this technique of analysis has shown that its major component is: camphor (50.3%). The EOLD inhibitor adsorbed physically on the carbon steel surface obeys the Langmuir adsorption isotherm. The parameters of activation energy was fairly evaluated and discussed in this work.

Int. J. Corros. Scale Inhib., , 1, 25-41 PDF (893 K)
doi: 10.17675/2305-6894-2019-8-1-3

Suppression of local corrosion of steel, brass and copper with IFKhAN-114 volatile inhibitor

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1 All-Russian Scientific Research Institute of Use of Machinery and Oil Products, Novo-Rubezhnyi per., 28, Tambov, 392022, Russian Federation
2 Tambov State Technical University, Sovetskaya str., 106, Tambov, 392000, Russian Federation
3 Derzhavin State University, Internatsyonalnaya str., 33, Tambov, 392000, Russian Federation
4 Angara GmbH, In der Steele 2, D-40599, Düsseldorf, Germany

Abstract: The possibility of preventing local corrosion of carbon steel St3, copper M2 and two-phase (α + β) brass L62 in an atmosphere with 100% relative humidity of air containing up to 0.6 vol.% CO2, 60 mg/m3 NH3, 30 mg/m3 H2S and IFKhAN-114 volatile corrosion inhibitor (VCI) was studied. The suppression of the local corrosion of carbon steel St3 and copper, which are constituents of the steel/copper, steel/brass and copper/ brass macro galvanic pairs, was evaluated in the presence of IFKhAN-114 in the second series of the experiments. The combined metal samples consisting of an outer metal ring 2.8 cm in diameter, into which a washer of metal of a different nature with a diameter of 2.0 cm was inserted through a tight fit, were used for corrosion tests of contact galvanic pairs. When assessing the effect of VCI on the overall corrosion rate of the above-mentioned steel/copper, steel/brass, and copper/brass galvanic pairs, their integral corrosion losses for 240 h per unit time were taken into account. Photography of the nature of the damage to the surface of the components of galvanic pairs was carried out after completion of corrosion tests and removal of corrosion products. It was shown that local corrosion of the macro-pair components in the form of ulcers and numerous pits observed in the presence of 0.60% CO2 or 0.2% CO2 + 20 mg/m3 NH3 + 10 mg/m3 H2S in uninhibited air, was hindered almost completely in the presence of the IFKhAN-114 inhibitor. The corrosion of these metals under these conditions is uniform, and the protective effect of the inhibitor is, %: 74 (steel), 99 (brass) and 60 (copper).

Int. J. Corros. Scale Inhib., , 1, 42-49 PDF (479 K)
doi: 10.17675/2305-6894-2019-8-1-4

Abstract:

Int. J. Corros. Scale Inhib., , 1,

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