DNA from Plant leaf Extracts: A Review for Emerging and Promising Novel Green Corrosion Inhibitors.

With growing global awareness and concern for environmental protection through the use of less hazardous and environmentally-friendly extracts of plant origin, there has been a plethora of green corrosion inhibitors research with far reaching contributions to the science of corrosion prevention and control. Attention has increasingly turned towards green corrosion inhibitors, compounds of natural origin with anti-oxidant activity towards metals and their alloys. Green inhibitors have been investigated for their corrosion and adsorption properties with good results. The findings from these research works provide evidence of the adsorption behavior of green inhibitors which was confirmed by the adsorption isotherms that were proposed. Adsorption is the first step of any surface reaction and since corrosion is a surface phenomenon the effectiveness of green corrosion inhibitors is related to their ability to adsorb on metal surfaces. This review proposes the potential of plant dna as an emerging and promising novel inhibitor for mild steel. It begins with a list of plants that have been used in studies to determine corrosion inhibition properties and moves on to establish the adsorption behavior of bio macromolecules; protein, polysaccharides (chitosan) and dna. It reviews studies and investigation of dna interaction and adsorption on inorganic surfaces before focusing on the use of salmon (fish) sperm dna and calf thymus gland dna as green corrosion inhibitors for mild steel. It concludes that plant dna is a promising candidate for green corrosion inhibitor given the similarity between the plant and animal dna structure and function, and the fact that the use of plant is more environmentally sustainable than animal-based produc

Self assembled film of thiol compounds on bronze

BOHLER;Das Land Steiermark;et al.;OMV;SANDVIK;voestalpinEuropean Corrosion Congress, EUROCORR 2015 --6 September 2015 through 10 September 2015 -- --2-aminoethanethiol (AET) and 2-mercapto-ethanol (ME) compounds have been studied for protection of bronze (CuSn5Pb5Zn5) against corrosion in test solution simulating urban rainwater (pH 5, including 0.2 g/L of each Na2SO4 and NaHCO3). The protection efficiencies were evaluated with electrochemical impedance spectroscopy (EIS) and potentiodynamic (PD) measurements. The surface of corroded samples was characterized by X-ray elemental energy dispersion spectroscopy (EDS) and scanning electron microscopy (SEM). The studied molecules are both capable for strong interaction with the copper content of bronze alloy. Also, it was anticipated that intermolecular interaction could arise due to presence of additional-OH and -NH2 end groups. For this purpose, the corrosion protection efficiency of these compounds has been investigated separately, as well as a mixture with 1:1 of molar ratio between two compounds. These bi-functional molecules exhibit strong adsorptive interaction with the alloy's surface, via-SH groups. Then the production of cupric/cuprous oxide has been diminished om the surface, the surface was protected with strongly adsorbed organic layer. It was also shown that the mixture could provide better protection efficiency, because of strong intermolecular attractions between AET and ME

A comparative study of polymer films on steel from ionic liquid and aqueous solution

Electrosynthesis of polypyrrole coatings on steel has been investigated in ionic liquid, 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMITFSI). The electrical conductivity, morphology, adhesion, permeability and the protection efficiency have been interpreted. For this purpose, SEM and ATR-FTIR spectroscopy measurements, electrochemical impedance spectroscopy (EIS), temperature dependent potentiodynamic polarization and electrochemical noise measurements were utilized. Ionic liquid synthesis environment offers a polymer film with low permeability and better electrical conductivity. However, it has a substantial drawback like poor adhesion on steel, when compared to coatings obtained from aqueous solution. In order to combine superiorities of different synthesis conditions bilayer coating system has been prepared and showed that this coating has better coating properties. © 2013 Elsevier B.V. All rights reserved

Inhibition effect of polyacrylic acid and its mixture with potassium iodide on mild steel corrosion in acid solution

The synergistic inhibition effect of polyacrylic acid and iodide ions was studied against mild steel corrosion in 0.5 M HCl solution. Potentiodynamic and electrochemical impedance spectroscopy measurements were realized in order to examine the corrosion process. In addition, the effect of long exposure period on inhibition efficiency was investigated. Surface morphology of steel was investigated by scanning electron microscopy technique. The obtained consequences revealed that mixture of polyacrylic acid and potassium iodide exhibited enhanced inhibition efficiency for mild steel corrosion because of synergistic effect. © 2018 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria.Firat University Scientific Research Projects Management Unit: FBA-2017-5008Acknowledgements: This research was supported by the Çukurova University Scientific Research Project Coordination Unit (Project Number: FBA-2017-5008)

The synthesis and inhibition efficiency of 2-(2-aminoethylamino)-1-phenylethanol

BOHLER;Das Land Steiermark;et al.;OMV;SANDVIK;voestalpinEuropean Corrosion Congress, EUROCORR 2015 --6 September 2015 through 10 September 2015 -- --2-(2-aminoethylamino)-1-phenylethanol compound was newly synthesized in our own laboratory, as a candidate for effective corrosion inhibitor against steel corrosion in acidic environment. Styrene oxide and ethylene diamine were used as starting materials. The molecular design was anticipated to exhibit strong adsorptive interaction with the surface via-NH2 group and hydrophobicity on top of adsorption layer due to presence of aromatic ring. Then, the inhibition efficiency of 2-(2-aminoethylamino)-1-phenylethanol has been investigated for mild steel corrosion in 0.5 M HCl solution. Electrochemical impedance spectroscopy and potentiodynamic measurements were utilized for different concentration and temperature conditions, for better understanding the inhibition mechanism. Also, further surface analysis was realized with help of scanning electron microscopy. All the results showed that this inhibitor has good inhibition efficiency on mild steel in 0.5 M HCl solution

Self assembled film based on hexane-1,6-diamine and 2-mercapto-ethanol on copper

The inhibition efficiencies of hexane-1,6-diamine (HMDA), 2-mercapto-ethanol (ME) and a mixture of these two compounds have been investigated against copper corrosion, in acidic chloride solution. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), atomic force microscopy (AFM), Fourier transformed infrared (FT-IR) and atomic absorption spectroscopy (AAS) measurements were utilized to study the inhibition mechanism. ME was shown to have higher efficiency than HMDA, also their mixture could exhibit extra ordinary protection efficiency. It was shown that this excellent efficiency is a result of self-assembled film on the surface. The surface analysis showed that the film has high surface roughness and its thickness can get higher than 0.50 µm. After 7 days exposure time to corrosive environment, the corrosion current (i corr ) values were calculated and it was shown that self assembled film had 98.22% protection efficiency. © 2012 Elsevier B.V

Inhibition effect of 1-ethyl-3-methylimidazolium dicyanamide against steel corrosion

The inhibition efficiency of 1-ethyl-3-methylimidazolium dicyanamide (EMID) was studied against mild steel corrosion, in acidic environment. Surface analysis showed that the assembled inhibitor film could protect the metal successfully, during 120h exposure to 0.1M H 2SO 4. The studies considering zero charge potential value (E pzc) showed that the anion plays the major role for film formation. The surface coverage ratio (?) values were determined handling the double layer capacitance values (C dl) calculated from Bode diagrams, for different concentration and temperature conditions. The inhibitor was fixed successfully within polypyrrole film and applied to steel surface as highly protective coating. © 2012 Elsevier Ltd

A new corrosion inhibitor for copper protection

Methyl 3-((2-mercaptophenyl)imino)butanoate (MMPB) was synthesized as inhibitor compound for copper protection. The molecule was designed with azole, thiol functional groups and carboxylate tail group. The inhibition efficiency was examined in acidic chloride media, by means of various electrochemical and spectroscopy techniques. Electrochemical study results showed that high efficiency of MMPB was mainly related with its capability of complex formation with Cu(I) at the surface. The thiol group also improves the adsorptive interaction with the surface, as the carboxylate groups provide extra intermolecular attraction. © 2014 Elsevier Ltd

Electrosynthesis of ZnO nanorods and nanotowers: Morphology and X-ray Absorption Near Edge Spectroscopy studies

Deposition mechanism of nano-structured ZnO films has been investigated in the absence and presence of chloride ions from aqueous solution. The resulting opto-electronic properties were interpreted extensively, using X-ray diffraction (XRD), X-ray Absorption Near Edge Spectroscopy (XANES), field emission scanning electron microscopy (FE-SEM), UV-Visible spectroscopy and four probe techniques. The ZnO deposition is mass transport controlled process and the interaction of chloride ions with the surface has great influence on diffusion kinetics, considering the substantial species (Zn 2+ and OH - ) involved in the construction of ZnO film. This effect does not change major lattice parameters, as shown with detailed analysis of XRD data. However, the texture coefficient (T c ) (0 0 2) value is higher in presence of chloride ions containing synthesis solution which gave vertically aligned, well defined and uniformly dispersed nanorods structure. The calculated E g values are in the range 3.28-3.41 eV and 3.22-3.31 eV for ZnO nanorods and nanotowers synthesized at different deposition periods, respectively. Furthermore, the charge mobility values regarding the deposition periods were measured to be in the ranges from 130.4 to 449.2 cm 2 V -1 s -1 and 126.2 to 204.7 cm 2 V -1 s -1 for nanorods and nanotowers, respectively. From XANES results, it was shown that the Zn K-edge spectrum is dominated by the transition of Zn 1s core electrons into the unoccupied Zn 4p states of the conduction band. Comparing the rod and tower nano-structured ZnO thin films, the excitation behavior of valence band electrons is different. Moreover, the density states of Zn 4p are higher for ZnO nanorods. © 2015 Elsevier B.V. All rights reserved

A new inhibitor for steel rebar corrosion in concrete: Electrochemical and theoretical studies

An original Schiff base 4-hydroxy-3-[1-(3-hydroxy-naphthalen-2-ylimino)-ethyl]-6-methyl-pyran-2-one (L1) is synthesized using the condensation method and characterized by X-ray diffraction spectroscopy (XRD). The compound obtained is a mono-crystal. The study of its inhibitory efficiency with respect to the corrosion of mild steel in reinforced concrete was realized using the potentiodynamic polarization and impedance spectroscopy (EIS) as electrochemical methods. The inhibition power of this Schiff base against the corrosion of mild steel in concrete is studied in the aggressive medium 0.5M NaCl as a function of the concentration of the inhibitor, immersion time and temperature. High inhibition power 90% is determined for the low concentration 10-6M at t=28 days and T= 30°C. This inhibition increases as a function of temperature. The thermodynamic study was used to identify the mechanism of inhibitory action of L1. The inhibiting power (EI%) and the apparent activation energy (Ea) have been calculated at different concentrations of L1. The values of ?Gads, Ea, ?Ha, and ?Sa showed that L1 is a good inhibitor of corrosion of the rebar in concrete in an environment of 0.5M NaCl. The inhibitor studied follows a chemisorption process. The adsorption behavior of this product obeys to Langmuir isotherm. The electrochemical results were confirmed with scanning electron microscopy (SEM). The quantum chemical parameters determined by theoretical calculations were used to elucidate the relationship between inhibiting effect of L1 and its molecular structure. © 2018 Published by ESG.Ministry of Higher Education and Scientific ResearchACKNOWLEDGEMENTS The authors gratefully acknowledge the financial support from the Algerian Ministry of Higher Education and Scientific Research. The authors would like to thank Professors Jean Paul Guisselbrecht from Laboratoire d’Electrochimie et de Chimie Physique du Corps Solide ULP Strasbourg France and Professors Mehmet Erbil and Tunç Tüken from Faculty of Science and Letters Chemistry Department Çukurova University Turkey for helpful