Semra bilgic

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James Marrow

University of Oxford

Oleg Yu Vorobyev

Siberian Federal University

Stuart Lyon

The University of Manchester

Shan Gao

Shanxi University

Md Kamal Hossain

Jahangirnagar University

OLUYEMI DARAMOLA, PhD

Federal University of Technology Akure

Martín A. Rodríguez

Universidad Nacional de San Martin

Rana A Anaee

University of Technology/Iraq

Wolfram Fürbeth

RWTH Aachen University

Elly Indra Setyarini

Universitas Prof. Dr. Moestopo (Beragama)

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Papers by Semra bilgic

Plant Extracts as Corrosion Inhibitors for Mild Steel in HCl Media – Review I

International Journal of Corrosion and Scale Inhibition, 2021

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Electrochemical and theoretical assessment of the effect of two biocides on the corrosion of petroleum steel in sulfur‐polluted Black Sea water

Materials and Corrosion, 2019

Although the inhibitory effects of different biocides continue to gain everincreasing importance,... more Although the inhibitory effects of different biocides continue to gain everincreasing importance, the corrosion inhibition of petroleum steel in the Black Sea water by such compounds remains largely uncharacterized. Thus, to study the effect of sulfate-reducing bacteria, corrosion parameters in oxygen-free medium contaminated with sulfur have been determined. The variation of corrosion rates with the addition of two biocides, glutaraldehyde (GA) and ammonium chloride (AC), has been determined by using Tafel extrapolation and linear polarization methods in sulfur-polluted seawater, both with and without biocides. Overall, this experimental work, also corroborated by theoretical data, reveals that some concentrations of GA and AC act as effective biocides in sulfur-polluted medium.

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Experimental and theoretical study of the inhibition effects of some Schiff bases as corrosion inhibitors of aluminium in HCl

Materials and Corrosion, 2011

... 5 References [1] KF Khaled, Corros. Sci. 2010, 52, 2905. [2] AS Fouda, GY El-Ewady, K. Shalab... more

Molecular-Level Understanding of the Inhibition Efficiency of Some Inhibitors of Zinc Corrosion by Quantum Chemical Approach

Industrial & Engineering Chemistry Research, 2012

2-[4-(Methylthio) phenyl] acetohydrazide (HYD) and 5-[4-(methylthio)benzyl]-4H-1,2,4-triazole-3-t... more 2-[4-(Methylthio) phenyl] acetohydrazide (HYD) and 5-[4-(methylthio)benzyl]-4H-1,2,4-triazole-3-thiol (TRD) are compounds that contain methylthiophenyl moiety and substantially inhibit corrosion of zinc in acidic medium. The relationship between molecular structures and inhibition efficiencies of these intriguing inhibitors remains the subject of intense speculation, as introduction of thiophenyl group in strategic positions of many molecules alters their activity. We have performed density functional theory calculations at the B3LYP/6-311++G(d,p) level to analyze the inhibition mechanisms proposed for these compounds. In agreement with experiments, the results afford a full explanation of the highest efficiency observed for TRD in terms of electronic and structural characteristics.

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A theoretical study of some hydroxamic acids as corrosion inhibitors for carbon steel

Corrosion Science, 2010

The corrosion inhibition characteristics of two hydroxamic acids, i.e., oxalyl-dihydroxamic acid ... more The corrosion inhibition characteristics of two hydroxamic acids, i.e., oxalyl-dihydroxamic acid (C2) and pimeloyl-1,5-di-hydroxamic acid (C7), on carbon steel has been studied using density functional theory (DFT). Quantum chemical parameters such as highest occupied molecular orbital energy (E HOMO), lowest unoccupied molecular orbital energy (E LUMO), and energy gap (DE) have been calculated using B3LYP/6-31 + G** basis set. The relationship between the inhibition efficiency and quantum chemical parameters has been discussed in order to elucidate the inhibition mechanism of these compounds.

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The effect of amino acids on the corrosion of nickel in H2SO4

Corrosion Science, 1992

The inhibitor effect of the amino acids on the corrosion of nickel in sulphuric acid medium was i... more The inhibitor effect of the amino acids on the corrosion of nickel in sulphuric acid medium was investigated. Thirteen amino acids with different properties were used. Corrosion current densities were determined by the extrapolation of the cathodic Tafel region to the corrosion potential. The effect of the amino acids on the passivity of nickel was examined by anodic current-potential curves. It was revealed that some amino acids are inhibitors to various degrees for nickel but that others accelerate corrosion.

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Léiomyome du corps ciliaire

Journal Français d'Ophtalmologie, 2005

We present our experience with three patients, two of whom were women, 16, 28 and 44 years of age... more We present our experience with three patients, two of whom were women, 16, 28 and 44 years of age, presenting with leiomyomas of the ciliary body. Salient clinical features were involvement of the left eye and temporal quadrants in two cases and extension into the anterior chamber in the other. Two patients underwent enucleation and the third had iridocyclochoroidectomy. Immunohistochemical studies showed strong positivity for muscle-specific actin, smooth muscle actin and desmin, whereas staining against vimentin, HMB-45 and S-100 protein was negative. Although there are no specific clinical or imaging signs for intraocular leiomyoma, this tumor should be suspected when pigmented ciliary body tumors are encountered, especially in young female patients.

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An investigation on the inhibition effects of some new dithiophosphonic acid monoesthers on the corrosion of the steel in 1M HCl medium

Materials Chemistry and Physics, 2005

... One of the general ways of dealing with this problem is based on the use of chemicals as inhi... more

Mining in Turkey

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The investigation of electrochemical behaviour of gold electrode in organic acids the effect of the number of cooh groups

Communications, Faculty Of Science, University of Ankara Series B Chemistry and Chemical Engineering, 1988

The Effect Of Cu Adatoms Upon The Electrochemical Properties Of Gold

Communications, Faculty Of Science, University of Ankara Series B Chemistry and Chemical Engineering, 1989

The preparation of platinum and gold single crystal surfaces and voltammetric behaviours of these electrodes

Communications, Faculty Of Science, University of Ankara Series B Chemistry and Chemical Engineering, 1999

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Electrochemical and quantum chemical studies of some Schiff bases on the corrosion of steel in H2SO4 solution

Applied Surface Science, Feb 15, 2007

The Reduction Mechanism Of Allyl Alcohol On Iron Surface And The Corrosion Of Iron

Communications, Faculty Of Science, University of Ankara Series B Chemistry and Chemical Engineering, 1987

The protective effect of polypyrrole coating on the corrosion of steel electrode in acidic media

Protection of Metals and Physical Chemistry of Surfaces, 2014

In this study, the corrosion parameters of stainless steel containing 12% Cr, have been determine... more In this study, the corrosion parameters of stainless steel containing 12% Cr, have been determined by Tafel extrapolation method in 1 M HCl, H 2 SO 4 and H 3 PO 4 media. Later, steel was coated with polypyrrole in 0.1 M Pyrrole + 0.3 M Oxalic acid solution by cyclic voltametric method. The corrosion parameters and percentage inhibition efficiencies of coated electrodes were investigated according to immersion times in the same media. In all acidic media studied, increases in immersion time, produced increased corrosion densities and a decrease in percentage inhibition efficiencies were determined.

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Monolayer and bilayer conducting polymer coatings for corrosion protection of steel in 1M H2SO4 solution

Progress in Organic Coatings, 2009

In this study, monolayer polypyrrole (PPY), polyaniline (PANI), and bilayer PPY/PANI, PANI/PPY co... more In this study, monolayer polypyrrole (PPY), polyaniline (PANI), and bilayer PPY/PANI, PANI/PPY coatings were deposited onto steel electrodes by electropolymerization in 0.1M monomer and 0.3M oxalic acid solution. Such corrosion parameters of these electrodes, as corrosion potentials, anodic Tafel constants and corrosion current densities were determined by means of current–potential curves as a function of time in 1M H2SO4 solution. These findings were compared to the corrosion parameters of a bare steel electrode in the same acid solution. The monolayer and bilayer polymer coatings were characterized by the Fourier transform infrared (FTIR) spectroscopy and SEM. Bilayer coatings displayed better corrosion inhibition efficiencies than monolayer coatings. Furthermore, the PPY/PANI coatings offered superior corrosion protection than the PANI/PPY coatings.

Plaque Radiotherapy in the Management of Retinoblastoma

Ophthalmology, 1993

Background: Radioactive episcleral plaque brachytherapy is a treatment method for selected retino... more Background: Radioactive episcleral plaque brachytherapy is a treatment method for selected retinoblastomas. The authors have used this technique since 1976 as both a primary and a secondary treatment method after other methods failed to achieve tumor control. Methods: A review of the records of 400 consecutive children with retinoblastoma showed that solitary plaque radiotherapy was used as a method of management in 103 cases. The authors' overall experience was evaluated, and the results between primary and secondary plaque therapies were compared in these 103 cases. Results: Of the 103 tumors, the mean basal diameter was 7 mm, and the mean thickness was 4 mm. Overlying vitreous seeds were clinically apparent in 50 cases (48%). The mean proximity of the tumor margin to the optic disc margin was 6 mm and to the foveola was 6 mm. The mean follow-up period was 40 months. In 89 cases (86%), the tumor was controlled by one plaque application, whereas in 13 cases (13%), tumor recurrence after initial tumor shrinkage necessitated subsequent treatment. Final visual outcome was good in 63 cases (62%), poor in 30 (29%), enucleation in 9 (9%), and unknown in 1 case. The poor vision was due to foveal retinoblastoma (with or without amblyopia) in 25 cases (83%). Eight of the nine enucleated eyes were treated initially with external beam radiotherapy then later with plaque radiotherapy. In 31 cases (30%), plaque radiotherapy was used as a primary treatment to the tumor, while in 72 cases (70%), it was a secondary form of management after failure of other methods to control the tumor. Statistical analysis showed that tumors treated with plaque radiotherapy as a primary measure were more likely to be larger in base (P = 0.01) and thickness (P = 0.01) than secondary treated tumors. The secondary treated retinoblastomas were more likely to have vitreous seeds (P = 0.02) than the primary treated tumors. The rate of tumor control and patient survival was similar between the two groups. Conclusion: Plaque radiotherapy is very effective in treating selected retinoblastomas with a high rate of tumor control and patient survival. It can be used successfully as a primary or a secondary treatment for tumors that have not been adequately controlled by other therapeutic methods.

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Effect of alkaline metal halides on the corrosion inhibition of steel in sulfuric acid containing benzoic acid

Materials Chemistry and Physics, 2003

Alkali metal halides were added to benzoic acid to improve its inhibition efficiency on steel cor... more Alkali metal halides were added to benzoic acid to improve its inhibition efficiency on steel corrosion in 0.5 M H 2 SO 4 medium. 10 −3 M concentrations of NaCl, NaBr and NaI were found to increase the inhibition efficiency of 2.0 × 10 −2 M benzoic acid by 37, 60 and 76%, respectively. Potassium salts of the same anions were less effective, 11, 44 and 65%, respectively; indicating that sodium ion have a more desirable influence on corrosion than potassium. The decrease in corrosion rate was found to be linear with respect to log of the salt concentration.

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The inhibition effects of benzoic acid and salicylic acid on the corrosion of steel in sulfuric acid medium

Materials Chemistry and Physics, 2002

The inhibitor effect of benzoic acid and salicylic acid in sulfuric acid medium on the steel with... more The inhibitor effect of benzoic acid and salicylic acid in sulfuric acid medium on the steel with known composition has been investigated. It has been determined that the corrosion rates decrease and that percentage inhibition efficiencies and surface coverage degrees increase with increasing acid concentration in all cases. However, benzoic acid acts as a better inhibitor compared to salicylic acid with equal concentration. It has been determined that the adsorption for both organic acids on the steel complies with the Langmuir isotherm.

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The corrosion inhibition of austenitic chromium–nickel steel in H2SO4 by 2-butyn-1-ol

Materials Chemistry and Physics, 2001

The corrosion inhibition on the austenitic chromium-nickel steel by 2-butyn-1-ol, which is an ace... more The corrosion inhibition on the austenitic chromium-nickel steel by 2-butyn-1-ol, which is an acetylenic alcohol, has been investigated in sulfuric acid. Therefore, the effect of concentration and temperature on inhibition properties was determined. It was found that this compound is adsorbed on the steel surface.-electrons act an important role for this adsorption. The experimental results are in accordance with Temkin isotherm.

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Plant Extracts as Corrosion Inhibitors for Mild Steel in HCl Media – Review I

International Journal of Corrosion and Scale Inhibition, 2021

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Electrochemical and theoretical assessment of the effect of two biocides on the corrosion of petroleum steel in sulfur‐polluted Black Sea water

Materials and Corrosion, 2019

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Experimental and theoretical study of the inhibition effects of some Schiff bases as corrosion inhibitors of aluminium in HCl

Materials and Corrosion, 2011

... 5 References [1] KF Khaled, Corros. Sci. 2010, 52, 2905. [2] AS Fouda, GY El-Ewady, K. Shalab... more