The Experts below are selected from a list of 41025 Experts worldwide ranked by ideXlab platform
Yu Jiang Wang - One of the best experts on this subject based on the ideXlab platform.
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research on Corrosion resistance of high velocity arc spray Coatings on surface of steel structure in splash zone environment
Materials Science Forum, 2011Co-Authors: Bin-shi Xu, Xiu Bing Liang, Yu Jiang WangAbstract:The most severe Corrosion of offshore steel structure occurs in splash zone. There are many factors affecting the steel structure Corrosion in the splash zone, such as Corrosion problems caused by seawater and effect of impacted brought by the ocean wave. Considering the Corrosion characteristics in splash zone and the Corrosion invalidity behaviors of offshore steel structure, the Zn-15Al, Al-RE, Zn-Al-Mg-RE and FeBSiNb uncrystal Coatings were prepared by automatic high velocity arc spraying. The different anti-Corrosion behaviors of the four Coatings were studied through the Corrosion comparative tests and the microstructures analyzed of the Coatings before and after the Corrosion tests. The anti-Corrosion Coating systems suitable for using on surface of steel structure Corrosion in the splash zone were found, which provided technique guarantee for extending the using life of offshore steel structures.
Tian C. Zhang - One of the best experts on this subject based on the ideXlab platform.
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Profiling iron Corrosion Coating on iron grains in a zerovalent iron system under the influence of dissolved oxygen
Water Research, 2006Co-Authors: Tian C. Zhang, Yong H. HuangAbstract:Rapid oxidation of Fe(0) by O(2) occurred when Fe(0) grains were bathed in 0.54 mM FeCl(2) solution saturated with dissolved oxygen (DO), forming a substantial Corrosion Coating on Fe(0) grains. A sonication method was developed to strip the Corrosion Coating off the iron grains layer by layer. The transformation of the constituents and the morphology of the Corrosion Coating along its depth and over reaction time were investigated with composition analysis, X-ray diffraction and scanning electron microscopy. Results indicate that the sonication method could consistently recover >90% iron oxides produced by the Fe(0)-DO redox reaction. Magnetite (Fe(3)O(4)) and lepidocrocite (gamma-FeOOH) were identified as the Corrosion products. Initially, lepidocrocite was the preferential product in the presence of DO. As the oxide Coating thickened, the inner layer transformed to magnetite, which retained as the only stable Corrosion product once DO was depleted. The study confirms the phase transformations between gamma-FeOOH and Fe(3)O(4) within a stratified Corrosion Coating. The sonication technique exemplifies a new approach for investigating more complicated processes in Fe(0)/oxides/contaminants systems.
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Reduction of nitrobenzene and formation of Corrosion Coatings in zerovalent iron systems.
Water Research, 2006Co-Authors: Yong H. Huang, Tian C. ZhangAbstract:Batch tests were conducted to investigate reduction of nitrobenzene in a zerovalent iron system (Fe0) under various conditions. The results indicated that a limited amount of nitrobenzene (ArNO2) could be reduced to aniline by Fe0, but formation of a lepidocrocite (γ-FeOOH) Coating could significantly slow down the reaction. However, augmenting Fe0 with substoichiometric FeCl2 could dramatically accelerate the reaction. Surface-adsorbed Fe(II), not pH nor Cl−, was found to be responsible for rejuvenating the system. O2 and nitrobenzene could be concomitantly reduced by Fe0 in the presence of Fe2+. In the Fe0 system, both nitrobenzene and O2 favored formation of lepidocrocite; in the presence of aq. Fe(II), a stratified Corrosion Coating could develop, with magnetite (Fe3O4) as the inner layer and lepidocrocite as the outer layer. Fe2+ was not the main reductant for the reactions, but might accelerate the autoreduction of lepidocrocite to magnetite by the underlying Fe0. Our understanding on the role of Fe(II) in conjunction with a stratified, evolving Corrosion Coating may be useful for establishing an iron aquatic Corrosion model.
Yong H. Huang - One of the best experts on this subject based on the ideXlab platform.
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Profiling iron Corrosion Coating on iron grains in a zerovalent iron system under the influence of dissolved oxygen
Water Research, 2006Co-Authors: Tian C. Zhang, Yong H. HuangAbstract:Rapid oxidation of Fe(0) by O(2) occurred when Fe(0) grains were bathed in 0.54 mM FeCl(2) solution saturated with dissolved oxygen (DO), forming a substantial Corrosion Coating on Fe(0) grains. A sonication method was developed to strip the Corrosion Coating off the iron grains layer by layer. The transformation of the constituents and the morphology of the Corrosion Coating along its depth and over reaction time were investigated with composition analysis, X-ray diffraction and scanning electron microscopy. Results indicate that the sonication method could consistently recover >90% iron oxides produced by the Fe(0)-DO redox reaction. Magnetite (Fe(3)O(4)) and lepidocrocite (gamma-FeOOH) were identified as the Corrosion products. Initially, lepidocrocite was the preferential product in the presence of DO. As the oxide Coating thickened, the inner layer transformed to magnetite, which retained as the only stable Corrosion product once DO was depleted. The study confirms the phase transformations between gamma-FeOOH and Fe(3)O(4) within a stratified Corrosion Coating. The sonication technique exemplifies a new approach for investigating more complicated processes in Fe(0)/oxides/contaminants systems.
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Reduction of nitrobenzene and formation of Corrosion Coatings in zerovalent iron systems.
Water Research, 2006Co-Authors: Yong H. Huang, Tian C. ZhangAbstract:Batch tests were conducted to investigate reduction of nitrobenzene in a zerovalent iron system (Fe0) under various conditions. The results indicated that a limited amount of nitrobenzene (ArNO2) could be reduced to aniline by Fe0, but formation of a lepidocrocite (γ-FeOOH) Coating could significantly slow down the reaction. However, augmenting Fe0 with substoichiometric FeCl2 could dramatically accelerate the reaction. Surface-adsorbed Fe(II), not pH nor Cl−, was found to be responsible for rejuvenating the system. O2 and nitrobenzene could be concomitantly reduced by Fe0 in the presence of Fe2+. In the Fe0 system, both nitrobenzene and O2 favored formation of lepidocrocite; in the presence of aq. Fe(II), a stratified Corrosion Coating could develop, with magnetite (Fe3O4) as the inner layer and lepidocrocite as the outer layer. Fe2+ was not the main reductant for the reactions, but might accelerate the autoreduction of lepidocrocite to magnetite by the underlying Fe0. Our understanding on the role of Fe(II) in conjunction with a stratified, evolving Corrosion Coating may be useful for establishing an iron aquatic Corrosion model.
Zen - One of the best experts on this subject based on the ideXlab platform.
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Steel Tank Internal Lining & External Coating
2018Co-Authors: ZenAbstract:A 10,000 barrel steel tank was leaking due to extensive Corrosion damage. The crude oil tank had holes in the floor and was leaking at the joints. The owner needed a high performance Coating that could plug these gaps and function as an effective anti-Corrosion Coating long into the future.
R. Causse - One of the best experts on this subject based on the ideXlab platform.
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Performance and degradation of sliding steel friction connections: Impact of velocity, Corrosion Coating and shim material
Engineering Structures, 2017Co-Authors: Geoffrey W. Rodgers, J.g. Chase, R. Causse, J. Chanchi, Gregory A. MacraeAbstract:Abstract It has become increasingly necessary to develop systems to decrease the impact of earthquakes by protecting people and mitigating resulting structural and economic damage. The Asymmetrical Friction Connection (AFC) or Sliding Hinge Joint (SHJ) has been intensively tested. It efficiently dissipates energy with almost no damage. However, its nonlinear mechanics have not fully been characterised. In this study, the AFC mechanism is fully modelled and parameterised using non-linear modelling. Menegotto-Pinto models of device behaviour, including added velocity dependence, are validated against a series of experimental tests. These SHJs are modelled for several shim (friction sliding surface) materials, as well as with and without Corrosion resistant Coatings. The non-linear models developed accurately capture the experimentally observed nonlinear mechanics. The impact of shim material and Corrosion Coating on resistive force and velocity dependence are quantified. In particular, Corrosion Coatings create negative velocity dependence from a positive dependence without the Coating. The overall modelling approach is suitable for use in a wide range of similar dynamic systems. Thus, the results also validate the overall modelling methods and the approach presented.
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CHARACTERISATION OF VELOCITY EFFECTS, Corrosion CoatingS AND SHIM MATERIALS ON INITIAL PERFORMANCE AND DEGRADATION OF SLIDING STEEL FRICTION CONNECTIONS
2013Co-Authors: R. Causse, J. Chanchi, C. CliftonAbstract:It has become increasingly necessary to develop systems to decrease the impact of earthquakes, to protect people and to mitigate the resulting structural and economic damage. The Asymmetrical Friction Connection (AFC) or Sliding Hinge Joint (SHJ) has been intensively tested. It efficiently dissipates energy with almost no damage. However, its nonlinear mechanics have not fully been characterised. In this research, the AFC mechanism is modelled and parameterised using non-linear modelling. MenegottoPinto models of device behaviour including added velocity dependence are validated against a series of experimental tests. These SHJs are modelled for several shim (friction sliding surface) materials, as well as with and without Corrosion resistant Coatings. The non-linear models developed accurately capture the experimentally observed nonlinear mechanics. The impact of shim material and Corrosion Coating on resistive force and velocity dependence are quantified. In particular, Corrosion Coatings create negative velocity dependence from a positive dependence without the Coating. The overall modelling approach is suitable for use in a wide range of similar dynamic systems. Thus, the results also validate the overall modelling methods and the approach presented.
