The Experts below are selected from a list of 2016 Experts worldwide ranked by ideXlab platform
Sung-mo Moon - One of the best experts on this subject based on the ideXlab platform.
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the inhibition mechanism of pitting corrosion of pure aluminum by nitrate and sulfate ions in neutral chloride solution
Journal of Solid State Electrochemistry, 1999Co-Authors: Su-il Pyun, Sung-mo MoonAbstract:The inhibition mechanism of pitting corrosion of Natural Oxide Film-covered pure aluminum by NO−3 and SO2−4 ions has been examined in 0.1 M NaCl solution using potentiodynamic polarization experiments, a.c. impedance spectroscopy, Auger electron spectroscopy and a combination of the potentiostatic current transient method and optical microscopy. It was found that NO−3 ions can be incorporated into the Natural Oxide Film on pure aluminum at open-circuit potential, but the incorporation of SO2−4 ions into the Film hardly occurs. The incorporation of NO−3 ions lowered the pitting susceptibility of pure aluminum in 0.1 M NaCl solution. Based upon the experimental results, it is suggested that the pitting corrosion inhibition mechanism by anions can be classified into two different groups: inhibition by competitive adsorption of anions (SO2−4) with Cl− ions and inhibition by the incorporation of anions (NO−3) into the Film rather than competitive adsorption. Both cases may impede the incorporation of Cl− ions into the Film, thus inhibiting pitting corrosion of Natural Oxide Film-covered pure aluminum in chloride solutions.
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Faradaic Reactions and Their Effects on Dissolution of the Natural Oxide Film on Pure Aluminum During Cathodic Polarization in Aqueous Solutions
Corrosion, 1998Co-Authors: Sung-mo Moon, Su-il PyunAbstract:Abstract Faradaic reactions and their effects on dissolution of the Natural Oxide Film on pure aluminum during cathodic polarization were investigated in aqueous 0.5 M sulfuric acid (H2SO4) and 0.5...
Su-il Pyun - One of the best experts on this subject based on the ideXlab platform.
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the inhibition mechanism of pitting corrosion of pure aluminum by nitrate and sulfate ions in neutral chloride solution
Journal of Solid State Electrochemistry, 1999Co-Authors: Su-il Pyun, Sung-mo MoonAbstract:The inhibition mechanism of pitting corrosion of Natural Oxide Film-covered pure aluminum by NO−3 and SO2−4 ions has been examined in 0.1 M NaCl solution using potentiodynamic polarization experiments, a.c. impedance spectroscopy, Auger electron spectroscopy and a combination of the potentiostatic current transient method and optical microscopy. It was found that NO−3 ions can be incorporated into the Natural Oxide Film on pure aluminum at open-circuit potential, but the incorporation of SO2−4 ions into the Film hardly occurs. The incorporation of NO−3 ions lowered the pitting susceptibility of pure aluminum in 0.1 M NaCl solution. Based upon the experimental results, it is suggested that the pitting corrosion inhibition mechanism by anions can be classified into two different groups: inhibition by competitive adsorption of anions (SO2−4) with Cl− ions and inhibition by the incorporation of anions (NO−3) into the Film rather than competitive adsorption. Both cases may impede the incorporation of Cl− ions into the Film, thus inhibiting pitting corrosion of Natural Oxide Film-covered pure aluminum in chloride solutions.
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Faradaic Reactions and Their Effects on Dissolution of the Natural Oxide Film on Pure Aluminum During Cathodic Polarization in Aqueous Solutions
Corrosion, 1998Co-Authors: Sung-mo Moon, Su-il PyunAbstract:Abstract Faradaic reactions and their effects on dissolution of the Natural Oxide Film on pure aluminum during cathodic polarization were investigated in aqueous 0.5 M sulfuric acid (H2SO4) and 0.5...
Visnja Katalinic - One of the best experts on this subject based on the ideXlab platform.
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aqueous extract of rosmarinus officinalis l as inhibitor of al mg alloy corrosion in chloride solution
Journal of Applied Electrochemistry, 2000Co-Authors: Maja Kliskic, Jagoda Radosevic, Senka Gudic, Visnja KatalinicAbstract:The first neutral phenol subfraction of the aqueous extract of rosemary leaves was studied as corrosion inhibitor for the Al–2.5Mg alloy in a 3% NaCl solution at 25 ∘C. Experiments were carried out over a wide range of concentrations. The results show that the additive adsorbs on the alloy according to the Freundlich isotherm. The polarization curves show that the first neutral subfraction acts as a cathodic-type inhibitor. The impedance spectrum obtained was interpreted in terms of change in characteristics of the Natural Oxide Film at the surface of the alloy. Equivalent circuits, which represent the system, are proposed and individual circuit elements are defined.
Maja Kliskic - One of the best experts on this subject based on the ideXlab platform.
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aqueous extract of rosmarinus officinalis l as inhibitor of al mg alloy corrosion in chloride solution
Journal of Applied Electrochemistry, 2000Co-Authors: Maja Kliskic, Jagoda Radosevic, Senka Gudic, Visnja KatalinicAbstract:The first neutral phenol subfraction of the aqueous extract of rosemary leaves was studied as corrosion inhibitor for the Al–2.5Mg alloy in a 3% NaCl solution at 25 ∘C. Experiments were carried out over a wide range of concentrations. The results show that the additive adsorbs on the alloy according to the Freundlich isotherm. The polarization curves show that the first neutral subfraction acts as a cathodic-type inhibitor. The impedance spectrum obtained was interpreted in terms of change in characteristics of the Natural Oxide Film at the surface of the alloy. Equivalent circuits, which represent the system, are proposed and individual circuit elements are defined.
Kazuhiro Ogawa - One of the best experts on this subject based on the ideXlab platform.
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elucidation of cold spray deposition mechanism by auger electron spectroscopic evaluation of bonding interface Oxide Film
Acta Materialia, 2019Co-Authors: Yuji Ichikawa, Kazuhiro Ogawa, Ryotaro Tokoro, Masatoshi TannoAbstract:Abstract The relationship between the cold spray deposition mechanism, microstructure, and strength of the resulting Film must be understood for this innovative process to be practical. Previous studies have suggested that the coating mechanism is reliant on breaking the Natural Oxide Film such that metallic bonding occurs through direct contact between the metal surfaces. In this study, the proposed model was experimentally verified by a small tensile adhesion test and auger electron spectroscopy analysis of the bonding interface. Since shear deformation does not occur at the tip (south pole) of the incoming particle, the Oxide Film is not broken, such that the bonding strength is weak. In contrast, at the outer edge of the particle, metallic bonding occurs, attaining a level of strength that exceeds that of the base material due to the huge plastic deformation. This phenomenon is known as the “south-pole problem,” and can lead to a decrease in the overall adhesion strength despite the local adhesion being strong. However, detailed observations revealed, in parts of the deposits, particles that had adhered across their entire surface. This suggests that, provided the collision state can be controlled, it is possible to overcome the south-pole problem and improve the adhesion strength.
