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Chuanhai Jiang - One of the best experts on this subject based on the ideXlab platform.
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electrochemical chemical growth of porous ni co cu oh 2 as an electrode material ternary ni co cu nanocrystalline films corroded in Neutral Salt spray
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 was reported based on the corrosion behaviors of Ni-Co-Cu films in Neutral Salt spray. The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects. The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures. The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH)2 could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH)2 electrode exhibited a high specific capacitance of 1738 F g−1 at a current density of 20 A g−1 and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors.
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Corrosion behavior and product film formation of Ni Co Cu nanocrystalline coatings in Neutral Salt environments
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The corrosion behavior of Ni Co Cu nanocrystalline coatings in Neutral Salt environments was systematically investigated by potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy, and long-term Salt spray tests. The electrodeposited ternary coatings were Ni-based solid solution alloys that contained markedly different contents of Co and Cu. Greater Co and Cu contents strongly reduced the polarization and charge-transfer resistance of the coatings, thus decreasing their corrosion resistance in Neutral NaCl solutions. In Salt spray tests, the initial porous corrosion product film on the Co-/Cu-poor coating evolved into a compact film that finally grew to cover the coating surface, while such morphological transition was absent on the Co-/Cu-rich coating, where the formed film showed a continuous deterioration in its initial porous structure. Abundant Co-/Cu-substituted α-Ni(OH)2 might grow to form the primary compact films that could coalesce and thicken as corrosion was suppressed. A large amount of Cu(OH)2 together with high corrosion rates might be detrimental to the formation of compact films. A mechanism of the formation of the corrosion product films was proposed based on the corrosion characteristics of the ternary system and detailed corrosion product film analysis.
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Electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 as an electrode material: Ternary Ni-Co-Cu nanocrystalline films corroded in Neutral Salt spray
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 was reported based on the corrosion behaviors of Ni-Co-Cu films in Neutral Salt spray. The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects. The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures. The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH)2 could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH)2 electrode exhibited a high specific capacitance of 1738 F g−1 at a current density of 20 A g−1 and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors.
Ze Chai - One of the best experts on this subject based on the ideXlab platform.
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electrochemical chemical growth of porous ni co cu oh 2 as an electrode material ternary ni co cu nanocrystalline films corroded in Neutral Salt spray
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 was reported based on the corrosion behaviors of Ni-Co-Cu films in Neutral Salt spray. The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects. The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures. The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH)2 could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH)2 electrode exhibited a high specific capacitance of 1738 F g−1 at a current density of 20 A g−1 and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors.
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Corrosion behavior and product film formation of Ni Co Cu nanocrystalline coatings in Neutral Salt environments
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The corrosion behavior of Ni Co Cu nanocrystalline coatings in Neutral Salt environments was systematically investigated by potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy, and long-term Salt spray tests. The electrodeposited ternary coatings were Ni-based solid solution alloys that contained markedly different contents of Co and Cu. Greater Co and Cu contents strongly reduced the polarization and charge-transfer resistance of the coatings, thus decreasing their corrosion resistance in Neutral NaCl solutions. In Salt spray tests, the initial porous corrosion product film on the Co-/Cu-poor coating evolved into a compact film that finally grew to cover the coating surface, while such morphological transition was absent on the Co-/Cu-rich coating, where the formed film showed a continuous deterioration in its initial porous structure. Abundant Co-/Cu-substituted α-Ni(OH)2 might grow to form the primary compact films that could coalesce and thicken as corrosion was suppressed. A large amount of Cu(OH)2 together with high corrosion rates might be detrimental to the formation of compact films. A mechanism of the formation of the corrosion product films was proposed based on the corrosion characteristics of the ternary system and detailed corrosion product film analysis.
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Electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 as an electrode material: Ternary Ni-Co-Cu nanocrystalline films corroded in Neutral Salt spray
Electrochimica Acta, 2019Co-Authors: Ze Chai, Chuanhai JiangAbstract:Abstract The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)2 was reported based on the corrosion behaviors of Ni-Co-Cu films in Neutral Salt spray. The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects. The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures. The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH)2 could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH)2 electrode exhibited a high specific capacitance of 1738 F g−1 at a current density of 20 A g−1 and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors.
Jianping Lin - One of the best experts on this subject based on the ideXlab platform.
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effect of Neutral Salt spray nss exposure on the lap shear strength of adhesive bonded 5052 aluminum alloy aa5052 joints
Journal of Adhesion Science and Technology, 2019Co-Authors: Shuang Wang, Junying Min, Jianping LinAbstract:This work explores the mechanisms for the non-linear degradation of the lap-shear strength of adhesive-bonded 5052 aluminum alloy (AA5052) joints exposed to Neutral Salt spray (NSS) environment up ...
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Effect of Neutral Salt spray (NSS) exposure on the lap-shear strength of adhesive-bonded 5052 aluminum alloy (AA5052) joints
Journal of Adhesion Science and Technology, 2018Co-Authors: Shuang Wang, Junying Min, Jianping LinAbstract:AbstractThis work explores the mechanisms for the non-linear degradation of the lap-shear strength of adhesive-bonded 5052 aluminum alloy (AA5052) joints exposed to Neutral Salt spray (NSS) environ...
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Effect of long-term Neutral Salt spray exposure on durability of adhesive-bonded Zr–Ti coated aluminum joint
International Journal of Adhesion and Adhesives, 2016Co-Authors: Jianping Lin, Pei-chung Wang, Rui ZhengAbstract:Abstract In this study, the effect of long-term Neutral Salt spray (NSS) exposure (i.e., 50 g/L concentration of Salt solution at 25 °C) on the retained strengths of Zr–Ti coated and bare lap-shear aluminum joints bonded with hem flange adhesive Henkel Terokal 8021 NB was investigated. A one-part toughened epoxide adhesive and Zr–Ti coated aluminum substrates (i.e., AA6014-T4 and AA6016-T4) were selected. Adhesive-bonded coated aluminum joints (ACJ) and bare aluminum joints (ABJ) were fabricated and exposed in NSS environment for various times. Quasi-static tests were conducted immediately following removal of the joints from the Salt chamber at the ambient condition. It was found that while NSS exposure for 720 h degraded little the strength of ACJ, it decreased the strength of ABJ. The Zr–Ti coating protected aluminum substrates from electrochemical reaction and consequently minimized the strength degradation. As the exposure time was prolonged to 1400 h, the strength of ACJ was reduced drastically while the strength of ABJ was only degraded slightly. Fractography, differential scanning calorimetry, electrochemical potentiostatic polarization measurements, and X-ray photoelectron spectroscopy analyses revealed the strength degradation of ACJ was caused primarily by the corrosion of Zr–Ti coating. The passive film on bare aluminum provided a long time protection against NSS exposure, and consequently minimized the strength degradation for ABJ.
Greg M. Swain - One of the best experts on this subject based on the ideXlab platform.
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Cross comparison of TCP conversion coating performance on aluminum alloys during Neutral Salt-spray and thin-layer mist accelerated degradation testing
Electrochimica Acta, 2018Co-Authors: Catherine A. Munson, Sarah A. Mcfall-boegeman, Greg M. SwainAbstract:Abstract The stand-alone corrosion resistance imparted to aluminum alloy 7075-T6 by different commercial trivalent chromium process (TCP) conversion coatings was evaluated after exposure to 7-day (i) Neutral Salt-spray (NSS) and (ii) thin-layer mist (TLM) tests. Comparison studies were performed with a non-chromium conversion coating (NCP). Quantitative assessment of the corrosion damage was made using scanning contact profilometry, weight loss and digital microscopy image analysis data. Analysis of the inorganic chemical composition in the coating baths was performed to correlate the Zr, Cr and F levels with the corrosion resistance. All the TCP and NCP conversion coatings provided an equivalent level of corrosion protection to this alloy during the 7-day NSS test. In contrast, greater differences in coating performance were observed after the 7-day TLM test. In terms of average pit depth, surface roughness, weight loss, pit area and pit density, one TCP coating outperformed the other TCP and NCP coatings. This coating bath had the highest Cr concentration (416 ppm) and the highest Zr/Cr ratio (2.1). The results demonstrate that differences in the stand-alone TCP coating performance can be observed but this depends on the nature of the accelerated degradation test used.
Ivan S. Cole - One of the best experts on this subject based on the ideXlab platform.
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A microclimate model to simulate Neutral Salt spray testing for corrosion inhibitor evaluation and functional coating development
Progress in Organic Coatings, 2017Co-Authors: F.f. Chen, Michael Breedon, Erik D. Sapper, W. D. Ganther, D. Lau, Ivan S. ColeAbstract:A microclimate exposure model was developed to simulate the Neutral Salt spray test (NSS) environment which was used to estimate the pitting corrosion inside an artificial defect of a coating system, when it is exposed to a virtual microclimate. The model uses a dynamic process to simulate Salt fog droplet formation, subsequent coalescence, and movement on a coated surface, to determine wet-dry cycles on realistic test samples. While the presented model is formulated to comply with standardised NSS tests, e.g. ASTM B117, the developed method can be tuned to simulate a variety of common cyclic environmental testing conditions, and has wide applicability for the virtual assessment of functional coatings. We will show that when validated against empirical data obtained from inhibitor and pitting studies, the developed model is able to predict the pit growth rate of an AA2024‐T3 aluminium alloy panel placed in a NSS test chamber. We will also explore the adaptation of the model to encompass the virtual assessment of functional coatings such as corrosion inhibiting coatings, and their impact on reducing pitting events and pit growth. This work demonstrates an effective approach for building models and establishing interrelationships with other corrosion models or empirical data to produce a predictive system that could ultimately lead to a rapid methodology for virtually screening new functional coatings and formulations, reducing labour costs and freeing up testing infrastructure for materials validation tasks.