Enhancement of structural and charge-transfer barrier properties of n-alkanethiol layers on a polycrystalline copper surface by electrochemical potentiodynamic polarization

2010 ◽  
Vol 12 (25) ◽  
pp. 6590 ◽  
Author(s):  
Željka Petrović ◽  
Mirjana Metikoš-Huković ◽  
Jeffrey Harvey ◽  
Sasha Omanovic
Keyword(s):  
Charge Transfer ◽  
Potentiodynamic Polarization ◽  
Barrier Properties ◽  
Copper Surface ◽  
Polycrystalline Copper

The Evolution of the Polycrystalline Copper Surface, First to Cu(111) and Then to Cu(100), at a Fixed CO2RR Potential: A Study by Operando EC-STM

Langmuir ◽  
2014 ◽  
Vol 30 (50) ◽  
pp. 15053-15056 ◽  
Author(s):  
Youn-Geun Kim ◽  
Jack Hess Baricuatro ◽  
Alnald Javier ◽  
John Mathew Gregoire ◽  
Manuel P. Soriaga
Keyword(s):  
Copper Surface ◽  
Polycrystalline Copper

Electrochemically Prepared Polycrystalline Copper Surface for the Growth of Hexagonal Boron Nitride

2017 ◽  
Vol 17 (4) ◽  
pp. 1669-1678 ◽  
Author(s):  
Karthik Sridhara ◽  
Boris N. Feigelson ◽  
James A. Wollmershauser ◽  
Jennifer K. Hite ◽  
Anindya Nath ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Copper Surface ◽  
Polycrystalline Copper

scholarly journals Electrochemical Investigation of Corrosion Behavior Heat Treated Al-6Si-0.5Mg-xCu (x = 0, 0.5, 1, 2, and 4 wt%) Alloys

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
A. Hossain ◽  
F. Gulshan ◽  
A. S. W. Kurny
Keyword(s):  
Charge Transfer ◽  
Potentiodynamic Polarization ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Nacl Solution ◽  
Transfer Resistance ◽  
Cu Content ◽  
Cu Alloy ◽  
Heat Treated

The corrosion behaviour of heat treated Al-6Si-0.5Mg-xCu (x=0.5, 1, 2, and 4 wt%) alloys in 0.1 M NaCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The potentiodynamic polarization curves reveal that 2 wt% Cu (Alloy-4) and 4 wt% Cu (Alloy-5) content alloys are more prone to corrosion than the other alloys investigated. But the EIS test results showed that charge transfer resistance (Rct) increases with increasing Cu content into Al-6Si-0.5Mg. Maximum charge transfer resistance (Rct) is reported with the addition of 2 wt% Cu and minimumRctvalue is for 4 wt% Cu content Al-6Si-0.5Mg alloy. Due to additions of Cu into Al-6Si-0.5Mg alloy, the magnitudes of open circuit potential (OCP), corrosion potential (Ecorr), and pitting corrosion potential (Epit) in NaCl solution were shifted to the more noble direction.

scholarly journals Atomic Scale Insight into Corrosion Inhibition: DFT Study of 2-Mercaptobenzimidazole on Locally De-Passivated Copper Surfaces

2021 ◽  
Author(s):  
Fatah Chiter ◽  
Dominique Costa ◽  
Vincent Maurice ◽  
Philippe Marcus
Keyword(s):  
Metal Surface ◽  
Barrier Properties ◽  
Copper Surface ◽  
Atomic Scale ◽  
Localized Corrosion ◽  
Oxide Surface ◽  
Organic Film ◽  
Copper Surfaces ◽  
Significant Difference ◽  
Key Factor

Abstract A key factor for effective inhibition by organic molecules of the initiation of localized corrosion by pitting is their ability to form a protective organic film in locally de-passivated zones exposing the bare metal next to the oxide-covered surface. Herein, based on quantum chemical DFT calculations, we study the chemistry of the interface between 2-mercaptobenzimidazole (MBI) and a copper surface partially covered by a Cu2O passive oxide film. The results show the adaptability of the molecule to adsorb strongly on the different zones, oxide or metal, of a locally de-passivated surface. However, differences in the local adsorption configurations, involving covalent bonding with H-bonding depending on oxide or metal and on conformer, thione or thiolate, lead to the formation of an inhomogeneous organic film. Increasing order of local adsorption strength is oxide walls < metal surface < oxide surface < oxide edges for the thione species, whereas there is no significant difference of local adsorption strength for the thiolate species. Our results suggest that both species of MBI can heal the oxygen and copper low coordinated sites as well as can protect the exposed metal surface, thus enhancing the barrier properties of the passivated surface even when locally defective.

Room-Temperature UHV-Deposited Titanium Monoxide Films on Oxidized Polycrystalline Copper

2001 ◽  
Vol 672 ◽  
Author(s):  
V. M. Fuenzalida ◽  
C. R. Grahmann ◽  
C. Herrera ◽  
R. A. Zárate ◽  
C. Avila ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Copper Substrate ◽  
Copper Film ◽  
Copper Surface ◽  
Native Oxide ◽  
Titanium Monoxide ◽  
Copper Films ◽  
Polycrystalline Copper ◽  
Tungsten Boat

ABSTRACTPolycrystalline copper films thicker than 100 nm were evaporated on silicon wafers with their native oxide under ultrahigh vacuum conditions leading to an rms roughness of ~2 nm of the copper film. X-ray photoelectron spectroscopy (XPS) revealed a clean copper surface with only traces of oxygen. The samples were exposed to air, leading to an oxide film consisting of CuO. TiO films were subsequently deposited onto the oxidized copper films from a resistively heated tungsten boat with the substrate at room temperature. The TiO films exhibited good adherence and were amorphous. XPS measurements revealed that the TiO films were contamination-free and that the first layers of TiO reduced the thin native oxide of the copper substrate from Cu(II) into Cu(I) or Cu(0) and transformed the TiO into TiO2 at the interface.

New Aspects of Copper Corrosion in a Neutral NaCl Solution in the Presence of Benzotriazole

CORROSION ◽  
10.5006/2569 ◽  
2018 ◽  
Vol 74 (6) ◽  
pp. 613-622 ◽  
Author(s):  
H.R. Zhao ◽  
Y.L. Xu ◽  
C.K. Chen ◽  
Y. Chen ◽  
Y.W. Liu ◽  
...  
Keyword(s):  
Potentiodynamic Polarization ◽  
Photoelectron Spectroscopy ◽  
Gradual Increase ◽  
Film Formation ◽  
Activation Parameters ◽  
Copper Surface ◽  
Competitive Reaction ◽  
Experimental Conditions ◽  
Exponential Factor ◽  
X Ray

The corrosion behavior of copper in neutral NaCl solutions in the presence of benzotriazole (BTAH) was studied by potentiodynamic polarization, Fourier transform infrared spectroscopy (FTIR), and x-ray photoelectron spectroscopy (XPS). The thermodynamic parameter reveals that a decrease in the current density of the dissolution process is mainly controlled by the activation parameters when the BTAH concentration is low, whereas the control changed to the pre-exponential factor with increasing BTAH concentration from 10 mg/L to 40 mg/L from the potentiodynamic polarization results. Cu2O, CuO, Cu(OH)2, and Cu(I)BTA were all detected on the copper surface under our experimental conditions. When the BTAH concentration is low, the δ(Cu2+) value increases sharply, whereas a gradual increase occurs when the BTAH concentration increases from 10 mg/L to 40 mg/L, which may be ascribed to the competitive reaction of Cu2+ and Cu(I)BTA with a preference for Cu(I)BTA film formation.

Influence of oxidative treatment of copper grid electrodes on the efficiency of conversion to aniline in the electroreduction of nitrobenzene and azobenzene in basic aqueous methanol

1994 ◽  
Vol 72 (12) ◽  
pp. 2353-2360 ◽  
Author(s):  
Anna Martel ◽  
Amoy Kam Cheong ◽  
Jean Lessard ◽  
Louis Brossard
Keyword(s):  
Current Efficiency ◽  
Copper Surface ◽  
Polycrystalline Copper ◽  
High Current ◽  
Average Yield ◽  
Aqueous Methanol ◽  
Copper Electrodes ◽  
Controlled Potential ◽  
Average Current ◽  
High Yields

The influence of preoxidizing the surface of polycrystalline copper electrodes on the efficiency of the controlled potential electrochemical reduction of nitrobenzene and azobenzene to aniline in basic aqueous methanol has been investigated. Electrodes electrochemically preoxidized to Cu(OH)2 or to Cu2O gave high yields of aniline (90–100%) with high current efficiencies (88–99%) for the electrohydrogenation of nitrobenzene compared to electrodes preoxidized by air (7–29% of aniline, 64–74% current efficiency). For the electrohydrogenation of azobenzene, copper electrodes preoxidized to Cu2O were found to be more active (average yield of aniline of 28%, average current efficiency of 55%) than electrodes preoxidized to Cu(OH)2 (3–11% of aniline, 42–53% current efficiency), and electrodes preoxidized by air were inactive (the electrohydrogenation stopped at hydrazobenzene). The improvement of activity induced by preoxidation of the copper surface is linked to the increase of the surface area.

scholarly journals ELECTROCHEMICAL BEHAVIOR OF POLYCRYSTALLINE COPPER DURING THE ADSORPTION OF CO ABSTRACT

2017 ◽  
Vol 20 (1) ◽  
pp. 19-26
Author(s):  
J. Salimon ◽  
M. Kalaji
Keyword(s):  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Adsorption Process ◽  
Supporting Electrolyte ◽  
Copper Surface ◽  
Polycrystalline Copper ◽  
Cathodic Potential ◽  
Subsequent Formation ◽  
Adsorption Of Co ◽  
Supporting Electrolyte Solution

The electrochemical properties of electrode copper in carbon monoxide-saturated phosphate buffered solution were investigated. The electrochemistry of copper surface was sufficiently changed after the supporting electrolyte solution was saturated with CO. The hydrogen evolution region was depressed and shifted cathodically due to the adsorption process of CO on the copper surface in a linear or terminally bonded manner, Cu-CO . The oxidation and the reduction peaks of copper were significantly changed with two couple of redox peaks. This is due to the subsequent formation and the corresponding reduction of copper(I) and the copper carbon monoxides species. Further changed in electrochemical properties occurred when the electrode surface was polarized at high cathodic potential (-1.4 V) for a period of time (15 min). The hydrogen evolution region was further depressed due to the adsorption of CO process in multiple bonding sites as adsorbed bridge bonded CO, Cu-CO B L that occurred predominantly.

scholarly journals Corrosion inhibition of locally de-passivated surfaces by DFT study of 2-mercaptobenzothiazole on copper

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Fatah Chiter ◽  
Dominique Costa ◽  
Vincent Maurice ◽  
Philippe Marcus
Keyword(s):  
Metal Surface ◽  
Barrier Properties ◽  
Copper Surface ◽  
Atomic Scale ◽  
Localized Corrosion ◽  
Oxide Surface ◽  
Protection Efficiency ◽  
Surface Areas ◽  
Organic Inhibitors ◽  
Quantum Chemical Dft Calculations

AbstractInvestigating the interaction of organic inhibitors with metal and alloy surfaces is crucial for an atomic-scale understanding of their protection efficiency, particularly on the initiation of localized corrosion by pitting. Quantum chemical DFT calculations were performed to optimize the constructed model of a depassivated copper surface and to study the adsorption of 2-mercaptobenzothiazole (MBT), on different zones exposed by local depassivation. Reactive sites exist at the metal surface, at the oxide surface, as well as on the oxide edges and oxide walls. The surface-reactive sites are the unsaturated and saturated copper atoms and singly and doubly unsaturated oxygen atoms of the oxide, and the copper atoms of the metal. The sulfur (Sexo and Sendo) and nitrogen (N or NH) atoms are the reactive sites in the molecules. MBT can covalently bond to the oxide surface as well as to the oxide edges, oxide walls, and metal surface exposed by depassivation. For the thione species, local adsorption strength decreases as oxide edges > oxide surface > metal surface > oxide walls, suggesting that MBT heals the low coordinated sites. For the thiolate species, adsorption strength is similar on the different area, except the oxide walls. The results show the ability of the inhibitor to interact on different zones of a locally depassivated surface and to form a strongly adsorbed organic film, which can block the initiation of localized corrosion by enhancing the interfacial barrier properties, including in the local surface areas incompletely passivated or locally damaged by depassivation.

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