Adsorption and inhibition effect of 2-thiohydantoin on mild steel corrosion in 0.1 M HCl

WOS: 0003029801000102-Thiohydantoin (2-THD) was investigated as a corrosion inhibitor of mild steel (MS) in 0.1 M HCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and linear polarization resistance (LPR) measurements. The effects of temperature, hydrogen gas evolution and change of open circuit potential with immersion time were also studied. The MS surfaces with, and without inhibitor has been characterized by SEM. The results showed that 2-THD acts as a mixed type inhibitor in 0.1 M HCl by suppressing simultaneously the cathodic and anodic processes via physical adsorption on the MS surface followed by the Langmuir adsorption isotherm. (C) 2012 Elsevier Ltd. All rights reserved.Cukurova UniversityCukurova University [FEF2008D7]The authors are greatly thankful to Cukurova University research fund (Project No. FEF2008D7) for financial support. The authors also acknowledge the Genetics and bioengineering Department of Yeditepe University for obtaining the SEM images

Investigation of adsorption and corrosion inhibition effect of 1,1'-thiocarbonyldiimidazole on mild steel in hydrochloric acid solution

WOS: 000289147200017The adsorption and inhibition effect of 1,1'-thiocarbonyldiimidazole (TCDI) on the corrosion of mild steel (MS) in 0.5 M HCl solution was studied in both short and long immersion time (120 h) with the help of electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. For long-time tests, the hydrogen gas evolution (VH2-t) and the change of open circuit potential with immersion time (E (ocp)-t) were also utilized in addition to the former two techniques. The surface morphology of MS after its exposure to 0.5 M HCl solution with and without 1.0 x 10(-2) M TCDI was examined by scanning electron microscopy (SEM). It was demonstrated that the inhibition efficiency of studied inhibitor is concentration depended and increased with TCDI concentration. The higher value of inhibition efficiency was obtained after longer immersion time merely on the basis of strong increase of corrosion rate of mild steel in the blank solution. The high inhibition efficiency was discussed in terms of adsorption of inhibitor molecules and protective film formation on the mild steel surface which was substantiated by SEM micrographs. The adsorption of TCDI on MS was found to obey Langmuir adsorption isotherm.Cukurova UniversityCukurova University; Scientific and Technical Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)The authors are greatly thankful to Cukurova University research fund and the Scientific and Technical Research Council of Turkey (TUBITAK) for financial support

Adsorption and corrosion inhibition effect of 2-((5-mercapto-1,3,4-thiadiazol-2-ylimino)methyl)phenol Schiff base on mild steel

WOS: 000286904800074In this study, the inhibition effect of 2((5-mercapto-1,3,4-thiadiazol-2-ylimino)methyl)phenol Schiff base (MTMP) on mild steel corrosion in 0.5 M HCl solution was studied. For this aim, electrochemical techniques such as potentiodynamic polarization curves, weight loss (WL), electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) were used. It was shown that, the MTMP Schiff base has remarkable inhibition efficiency on the corrosion of mild steel in 0.5 M HCl solution. Polarization measurements indicated that, the studied inhibitor acts as mixed type corrosion inhibitor with predominantly control of cathodic reaction. The inhibition efficiency depends on the concentration of inhibitor and reaches 97% at 1.0 mM MTMP. The remarkable inhibition efficiency of MTMP was discussed in terms of blocking of electrode surface by adsorption of inhibitor molecules through active centers. The adsorption of MTMP molecules on the mild steel surface obeys Langmuir adsorption isotherm. (C) 2010 Elsevier B.V. All rights reserved.Cukurova UniversityCukurova UniversityThe authors are greatly thankful to Cukurova University Research Found for its financial support

Molybdenum disulfide as the interfacial layer in the CuO-TiO2 photocathode for photoelectrochemical cells

WOS: 000407946700065Photoelectrochemical cells guarantee the production of hydrogen as the clean energy source to overcome energy crisis. In this study, we have explored the impact of MoS2 as the interfacial layer in the CuO-TiO2 composite photocathode framework. The CuO was electrodeposited on the indium tin oxide (ITO) coated glass substrates and subsequently treated at high temperature (550 degrees C for 2 h) to develop CuO. The fitting of electrochemical impedance spectroscopy data revealed a decrease in the magnitude of total impedance (CEuroZCEuro) for the composite photocathode with MoS2 as the interfacial layer between the CuO and TiO2. The magnitudes of charge transfer resistance for the ITO/CuO, ITO/CuO/TiO2, and ITO/CuO/MoS2/TiO2 electrodes were calculated as 429,170, 18,490, and 17,388 Omega cm(-2), respectively. Likewise, the photocurrent density was increased with the addition of MoS2 at the interface up to -0.73 mA cm(2) which was recorded -0.39 mA cm(2). This study is critical for the future improvement of the potential photocathode materials with enhanced photocurrent response.Scientific and Technological Research Council of Turkey (TUBITAK Project) under the 2236-Co-Funded Brain Circulation Scheme [116C035]The author acknowledge the financial support by the Scientific and Technological Research Council of Turkey (TUBITAK Project No: 116C035) under the 2236-Co-Funded Brain Circulation Scheme

A study of the effect of Agave Americana extract inhibitor on the corrosion of mild steel in 0.5 M H-2 SO4

WOS: 000446309800004The inhibitor effect of Agave Americana Extract (AAE), on mild steel corrosion in 0.5 M H2SO4, was investigated by potentio dynamic polarization technique and Electrochemical Impedance Spectroscopy (EIS). The inhibitor concentration effect on the corrosion process was studied. AAE acts as a mixed type inhibitor, and the inhibition efficiency increases according to the inhibitor concentration's increase up to 81.87% at 2000 ppm. The inhibitor adsorption process is spontaneous and follows the Langmuir isotherm, as well as its molecules are both physisorbed and chemisorbed on steel surface. The inhibitor film formation was confirmed by ATR-FTIR and SEM analyses

A novel thiophene Schiff base as an efficient corrosion inhibitor for mild steel in 1.0 M HCl: Electrochemical and quantum chemical studies

WOS: 000447482500043This study presents the synthesis, structural characterization, and inhibition efficiency of a new sulphur containing Schiff base (4-((thiophene-2-ylmethylene)amino)benzamide) (4-TAB) on mild steel in 1.0 M HCl solution. The inhibition efficiency of the 4-TAB is analysed by using electrochemical analysis, solution assay analysis, and theoretical calculation. Electrochemical impedance spectroscopy and linear polarization resistance results show the highest inhibitor efficiency of 96.8% and 96.5%. respectively. The potentiodynamic polarization measurements indicate a decreasing corrosion rate from 9.104 to 0.481 mm year(-1) by addition of 4-TAB. Theoretical calculations are performed using the density functional theory to further confirm and compare our experimental results. (C) 2018 Elsevier B.V. All rights reserved.Cukurova UniversityCukurova University [FBA-2017-7056]This work was supported by Cukurova University Scientific Research Project (grant numbers: FBA-2017-7056)

The noble metal loading binary iron-zinc electrode for hydrogen production

WOS: 000399623500003The binary FeZn was electrodeposited on graphite surface for hydrogen evolution reactions. Then, zinc was leached from the surface by an etching method in alkaline solution. A trace amount of platinum and ruthenium electrochemically deposited on binary FeZn, respectively. All electrodes were characterized by cyclic voltammetry, electrochemical impedance spectroscopy and potentiodynamic polarization techniquei in KOH solution. The surface structures were characterized by scanning electron microscopy and energy dispersive X-ray. The results show that etching process enhanced the surface area. The prepared electrodes exhibited much higher activity after noble metal loadings. It is seen from experimental research that the most active electrode is C@FeZn/Ru. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved