F-KCW-Department Publications

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Start date: 2020Subject: search.filters.subject.Mild steel

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Now showing 1 - 8 of 8
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    GLYCERAL TRINITRATE: AS POTENTIAL CORROSION PROTECTOR FOR MILD STEEL IN ACID MEDIUM ALONG WITH PAINT-COATED STEEL IN A SALINE ENVIRONMENT
    (Oriental Journal of Chemistry, 2021-12-21) Menaga M; Sowmya, Ramkumar; Nalini D
    The importance of mild steel lies in its industrial applications, and the fight against corrosion is very important from an ecological, economic, technical, and aesthetic view. The current study involves the use of pharmaceutical drugs namely GTN towards corrosion inhibiting reaction was examined by gravimetric and electrochemical approaches. From weight loss studies, maximum I.E (%) 94.04% reached for 60 mg/L concentration of GTN for 6 hrs immersion time. The Polarization measurements showed that the behaviour of GTN as mixed nature and surface assimilation of GTN at the superficial, such that water molecules are substituted at the solution-metal boundary. The corrosion resistance property of the studied inhibitor as coating was also evaluated in NaCl which shows better progress corrosion retardation property of coating in the saline medium. Theoretical calculations were employed using DFT to correlate with the experimental observations.
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    UTILIZATION OF BIOWASTE AS AN ECO-FRIENDLY BIODEGRADABLE CORROSION INHIBITOR FOR MILD STEEL IN 1 MOL/L HCL SOLUTION
    (Science Direct, 2020-12) Venkatesan, Hemapriya; Mayakrishnan, Prabakaran; Subramanian, Chitra; Manoharan, Swathika; Seung-Hyun, Kim; Ill-Min, Chung
    This report focuses on the application of a biodegradable biowaste [human hair-(HHR)], to produce a mild steel corrosion inhibitor. The performance of HHR extract in inhibiting metallic corrosion in 1 mol/L HCl was investigated. The analysis of the metal corrosion behavior using electrochemical and weight loss techniques revealed that HHR exhibits an efficient corrosion-mitigating effect via adsorption on the metal surface following a Langmuir isotherm. Tafel-plot results revealed the mixed-mode corrosion protection behavior of HHR. Surface analysis using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), and Fourier transform infrared (FT-IR) spectroscopy provided evidence for the precipitation of a protective HHR film on the metal surface.
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    EXPERIMENTAL RESULTS WITH HYPOTHETICAL EVIDENCES FOR BEXOL AS AN EFFECTIVE INHIBITOR ON CORROSION INHIBITION OF MILD STEEL IN ACIDIC ENVIRONMENT AND ITS EPOXY COATING BEHAVIOR
    (Oriental Journal of Chemistry, 2020-06-03) Menaga M; Nalini D; Sowmya, Ramkumar
    The inhibitive ability against mild steel corrosion of pharmacologically active compound Bexol towards acid was valued by gravimetric experiments and electrochemical experiments. The results of the weight loss studies indicated inhibition efficiency was boosted with increased concentration of Bexol from 5 mg/L to 45 mg/L in the acid environment. Potentiodynamic polarization behaviour of the metal specimen in presence of Bexol exposed the mixed style inhibitive action. EIS results established that Bexol adsorb at the metal/acid junction by mere electrostatic physical adsorption mechanism to inhibit the corrosion process. Epoxy coated mild steel without and with the studied bexol was used for electrochemical studies in 3.5% of NaCl for different time intervals. The Density Functional -theory was employed to scrutinize inhibition property of the considered inhibitor. Experimental measurement obtained shows perfect fit to the theoretical calculations
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    GLYCERAL TRINITRATE: AS POTENTIAL CORROSION PROTECTOR FOR MILD STEEL IN ACID MEDIUM ALONG WITH PAINT-COATED STEEL IN A SALINE ENVIRONMENT
    (An International Open Access, 2021-12-21) Menaga M; Sowmya, Ramkumar; Nalini D
    The importance of mild steel lies in its industrial applications, and the fight against corrosion is very important from an ecological, economic, technical, and aesthetic view. The current study involves the use of pharmaceutical drugs namely GTN towards corrosion inhibiting reaction was examined by gravimetric and electrochemical approaches. From weight loss studies, maximum I. E (%) 94.04% reached for 60 mg/L concentration of GTN for 6 h immersion time. The Polarization measurements showed that the behaviour of GTN as mixed nature and surface assimilation of GTN at the superficial, such that water molecules are substituted at the solution-metal boundary. The corrosion resistance property of the studied inhibitor as coating was also evaluated in NaCl which shows better progress corrosion retardation property of coating in the saline medium. Theoretical calculations were employed using DFT to correlate with the experimental observations.
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    ENHANCING THE ANTI-CORROSION AND REINFORCING PROPERTIES OF EPOXY COATINGS USING MODIFIED GRAPHENE OXIDE
    (Oriental Scientific Publishing Company, 2022-08-18) Thamaraiselvi N; Nalini D
    The present study deals with the synthesis and anticorrosion behavior of new modified graphene oxide. Superior corrosion resistance property was exhibited by graphene oxide and modified graphene oxide on mild steel and copper substrates. Along with the corrosion resistance behavior, the reinforcing nature of epoxy coating also improved. Graphene oxide was synthesized by Hummer’s method. Graphene oxide (GO) modified with ethanol extract of Kedrostis foetidissima (KF) plant leaves. Gas chromatography-mass spectrometry (GCMS) analysis was selected to identify the chemical constituents present in the plant. GO, KF, and modified GO (GO-KF) were characterized by Fourier transforms infrared spectroscopy (FTIR) and Field Emission Scanning Electron Microscope (FESEM). Corrosion protection behavior of epoxy coating on mild steel and copper with GO and modified Graphene Oxide were studied using, Salt spray test, Peel test, and Contact angle measurements. Results revealed that the modified GO sheets act as a good reinforcing agent for epoxy coating on mild steel and copper substrate in a 3.5% sodium chloride (NaCl) environment.
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    INHIBITORY ACTION OF MACARANGA PELTATA LEAVES EXTRACT ON THE CORROSION OF MILD STEEL IN 0.5 M SULPURIC ACID-QUANTUM CHEMICAL APPROACH
    (Elsevier, 2021-01-01) Athul K.K; Thilagavathy P; Nalini D
    Weight loss and electrochemical impedance spectroscopy (EIS) method were used for testing the corrosion inhibition effect of Macaranga peltata leaves (MPL) extract on corrosion of mild steel in 0.5 M sulphuric acid solution. The inhibitory effect of MPL was studied at various concentrations of the extract and different time of immersion. In all cases an optimal efficiency was found out. Maximum inhibition efficiency was 92.6% for 5%v/v at 5 h. Nyquist and Tafel plots gave a confirmation about the inhibitory action of the plant extract, agreeing with the weight loss method. The surface content of mild steel after immersion was investigated using IR and the inhibition mechanism is suggested as adsorption of the phytochemical constituents from the results. The Quantum chemical energy calculations become an additional support of the suggested mechanism
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    THIAZOLO THIADIAZOLE DERIVATIVES AS ANTI-CORROSION ADDITIVES FOR ACID CORROSION
    (Elsevier, 2020-03-03) Saranya J; Benhiba F; Anusuya N; Zarrouk A; Chitra S
    The inhibition efficiency (IE) of thiazolo thiadiazole (TT) derivatives on the mild steel corrosion in 1 M sulphuric acid was studied by weight-loss and electrochemical studies. The outcomes attained from these studies showed that the efficiency of the inhibitors was found to increase with increasing inhibitor concentration. Theoretical fitting of Langmuir isotherms were tried to elucidate the adsorption mode. Potentiodynamic Polarization studies revealed that these thiazolo thiadiazole derivatives performed as mixed type. DFT calculations have been performed to study the adsorption sites of these compounds taking part in the inhibition process through acceptor-donor interaction. Negative values of the interaction energy and high values of the binding energy obtained by molecular simulations (MC and MD) show that the synthesized thiazolo thiadiazolemolecules are strongly adsorbed on the iron surface with maximum protection against corrosion.
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    COMPARISON OF CORROSION INHIBITION OF MILD STEEL IN ACID MEDIA BYIMIDAZOLINE DERIVATIVE SYNTHESIZED BY CONVENTIONAL AND MICROWAVE SYNTHESIS
    (Vivekanandha Arts and Science College for Women, 2020-02-07) SowmyaRamkumar; S, Rajakumari; D, Nalini
    Acid solutions are widely used in industry, some important field of application being acid pickling, industrial cleaning, acid descaling, petrochemical processes etc. The majority of the corrosion inhibitors employed during production of steel form thin barrier layers between the steel surface and the corroding fluid. It was found that the formation of donor-acceptor surface complex between free or π-electrons of an organic inhibitor and vacant d-orbital of a metal is responsible for the inhibition of corrosion process. In the present study, Imidazoline derivative synthesized by conventional and microwave method is investigated for its anti-corrosion potential against mild steel in 1M HCl and 0.5M H2SO4 solution using electrochemical impedance spectroscopy, Potentiodyamic polarization and quantum chemical studies. Synthesized inhibitor is characterised by FTIR Spectra, DLS and SEM. The inhibition efficiency was evaluated at different concentrations of the inhibitor. The present investigation is carried out to find whether the greater inhibition efficiency for inhibitor synthesized by microwave method than conventional method. Electrochemical impedance spectroscopy: Nyquist plots for mild steel in 1M HCl and 0.5M H2SO4 with and without inhibitor results in increase in Rct values and decrease in Cdl shows the formation of the protective film of the inhibitor on the metal increases the efficiency of the inhibitor. The maximum inhibition efficiency of the inhibitor 98% and 79% at 20 ppm in HCl and H2SO4 synthesized by microwave method and by conventional method it shows the maximum efficiency of 89% and 70% respectively. From the Polarisation Measurements the Tafel constants obtained from the potentiodynamic polarisation curves indicate that the investigated compound was mixed type inhibitor. Molecular modelling has been conducted to correlate the corrosion inhibition properties with the calculated quantum chemical parameters. Quantum chemical parameters were studied by DFT BLYP 6-31G (d,p) basis set. The energy of the HOMO (EHOMO) provides information about the tendency of the molecule to donate electrons to an electron poor species. The higher the (EHOMO) is the greater tendency of a molecule to donate its electrons to the electron poor species. Therefore the studied compound provides an indication that it would have highest tendency to donate its electrons to the metal surface and therefore bind strongly to the metal surface. Adsorption sites is mainly over the Nitrogen atoms.