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Yanling Tian - One of the best experts on this subject based on the ideXlab platform.
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fabrication of super hydrophobic nickel film on copper substrate with improved corrosion inhibition by Electrodeposition Process
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Zhen Yang, Yanling TianAbstract:Abstract Inspired by the famous “lotus effect”, we have fabricated the super-hydrophobic surfaces with nickel film on copper substrates using a one-step Electrodeposition method. By adjusting Processing time, water contact angle of as-prepared surfaces can reach as high as 160.3 ± 1.5° with small rolling angle of 3.0 ± 0.5°, showing excellent super-hydrophobicity. After the deposition of nickel coating, the pristine copper surfaces became much rough with packed cauliflower-/thorn-like clusters. This unique surface texture contributed to trapping large amount of air and forming the air cushion underneath the water droplet, which can prevent the liquids contacting the copper substrate. The examination of surface chemical compositions implied that the deposited super-hydrophobic coating consisted of nickel crystals and nickel myristate. In this research, the formation mechanism of the electrodeposited super-hydrophobicity was extensively explained based on the analyses of surface texture and surface chemistry. Moreover, the corrosion resistance of the as-fabricated super-hydrophobic surface was estimated by the potentiodynamic polarization tests as well as the electrochemical impedance spectroscopy (EIS) measurements. The results demonstrate that the super-hydrophobic nickel coating showed excellent corrosion inhibition in simulated seawater solution. The existence of the super-hydrophobic coating could be regarded as a barrier and thus provide a perfect air-liquid interface that inhibits the penetration of the corrosive ions. This facile and effective method of Electrodeposition Process offers a promising approach for mass production of super-hydrophobic surfaces on various metals.
Na Xu - One of the best experts on this subject based on the ideXlab platform.
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corrosion performance of superhydrophobic nickel stearate nickel hydroxide thin films on aluminum alloy by a simple one step Electrodeposition Process
Surface & Coatings Technology, 2016Co-Authors: Na Xu, Dilip K Sarkar, Xgrant Chen, W P TongAbstract:Superhydrophobic thin films are fabricated on chemically cleaned aluminum alloy substrates by a one-step Electrodeposition Process in the ethanolic solution containing Ni2 + ions and stearic acid (SA) under applied DC voltage. Morphological features observed by scanning electron microscopy (SEM), indicate that the thin films are composed of cauliflower-like structures with micro-nano scale particles. The chemical compositions of these films are characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), which indicate that these films consist of low energy nickel stearate (Ni(SA)2). A schematic model of the Electrodeposition Process of Ni(SA)2 is also presented. Wetting analysis demonstrates that the surface of the film is superhydrophobic with a water contact angle (CA) of 160 ± 1° with contact angle hysteresis (CAH) of 2.1 ± 1°, which is obtained under optimum Electrodeposition conditions based on a 0.4 molar ratio of Ni2 +/SA solution. The corrosion resistance properties calculated from the Tafel curve of superhydrophobic surfaces prepared in this solution are 280 times larger than the chemically cleaned aluminum alloy substrate. Furthermore, electrochemical impedance spectroscopy (EIS) analysis demonstrates that the charge transfer resistance is 1.63 × 107 Ω·cm2 for superhydrophobic films (Ni2 +/SA = 0.4) compared to that of chemically cleaned aluminum alloy substrates (1.56 × 103 Ω·cm2). Therefore, the superhydrophobic film of Ni(SA)2 on the chemically cleaned aluminum alloy substrate improves the corrosion resistance performance of aluminum substrates in corrosive environments.
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Corrosion performance of superhydrophobic nickel stearate/nickel hydroxide thin films on aluminum alloy by a simple one-step Electrodeposition Process
Surface & Coatings Technology, 2016Co-Authors: Na Xu, Dilip K Sarkar, Xgrant Chen, W P TongAbstract:Superhydrophobic thin films are fabricated on chemically cleaned aluminum alloy substrates by a one-step Electrodeposition Process in the ethanolic solution containing Ni2 + ions and stearic acid (SA) under applied DC voltage. Morphological features observed by scanning electron microscopy (SEM), indicate that the thin films are composed of cauliflower-like structures with micro-nano scale particles. The chemical compositions of these films are characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), which indicate that these films consist of low energy nickel stearate (Ni(SA)2). A schematic model of the Electrodeposition Process of Ni(SA)2 is also presented. Wetting analysis demonstrates that the surface of the film is superhydrophobic with a water contact angle (CA) of 160 ± 1° with contact angle hysteresis (CAH) of 2.1 ± 1°, which is obtained under optimum Electrodeposition conditions based on a 0.4 molar ratio of Ni2 +/SA solution. The corrosion resistance properties calculated from the Tafel curve of superhydrophobic surfaces prepared in this solution are 280 times larger than the chemically cleaned aluminum alloy substrate. Furthermore, electrochemical impedance spectroscopy (EIS) analysis demonstrates that the charge transfer resistance is 1.63 × 107 Ω·cm2 for superhydrophobic films (Ni2 +/SA = 0.4) compared to that of chemically cleaned aluminum alloy substrates (1.56 × 103 Ω·cm2). Therefore, the superhydrophobic film of Ni(SA)2 on the chemically cleaned aluminum alloy substrate improves the corrosion resistance performance of aluminum substrates in corrosive environments.
W P Tong - One of the best experts on this subject based on the ideXlab platform.
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corrosion performance of superhydrophobic nickel stearate nickel hydroxide thin films on aluminum alloy by a simple one step Electrodeposition Process
Surface & Coatings Technology, 2016Co-Authors: Na Xu, Dilip K Sarkar, Xgrant Chen, W P TongAbstract:Superhydrophobic thin films are fabricated on chemically cleaned aluminum alloy substrates by a one-step Electrodeposition Process in the ethanolic solution containing Ni2 + ions and stearic acid (SA) under applied DC voltage. Morphological features observed by scanning electron microscopy (SEM), indicate that the thin films are composed of cauliflower-like structures with micro-nano scale particles. The chemical compositions of these films are characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), which indicate that these films consist of low energy nickel stearate (Ni(SA)2). A schematic model of the Electrodeposition Process of Ni(SA)2 is also presented. Wetting analysis demonstrates that the surface of the film is superhydrophobic with a water contact angle (CA) of 160 ± 1° with contact angle hysteresis (CAH) of 2.1 ± 1°, which is obtained under optimum Electrodeposition conditions based on a 0.4 molar ratio of Ni2 +/SA solution. The corrosion resistance properties calculated from the Tafel curve of superhydrophobic surfaces prepared in this solution are 280 times larger than the chemically cleaned aluminum alloy substrate. Furthermore, electrochemical impedance spectroscopy (EIS) analysis demonstrates that the charge transfer resistance is 1.63 × 107 Ω·cm2 for superhydrophobic films (Ni2 +/SA = 0.4) compared to that of chemically cleaned aluminum alloy substrates (1.56 × 103 Ω·cm2). Therefore, the superhydrophobic film of Ni(SA)2 on the chemically cleaned aluminum alloy substrate improves the corrosion resistance performance of aluminum substrates in corrosive environments.
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Corrosion performance of superhydrophobic nickel stearate/nickel hydroxide thin films on aluminum alloy by a simple one-step Electrodeposition Process
Surface & Coatings Technology, 2016Co-Authors: Na Xu, Dilip K Sarkar, Xgrant Chen, W P TongAbstract:Superhydrophobic thin films are fabricated on chemically cleaned aluminum alloy substrates by a one-step Electrodeposition Process in the ethanolic solution containing Ni2 + ions and stearic acid (SA) under applied DC voltage. Morphological features observed by scanning electron microscopy (SEM), indicate that the thin films are composed of cauliflower-like structures with micro-nano scale particles. The chemical compositions of these films are characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), which indicate that these films consist of low energy nickel stearate (Ni(SA)2). A schematic model of the Electrodeposition Process of Ni(SA)2 is also presented. Wetting analysis demonstrates that the surface of the film is superhydrophobic with a water contact angle (CA) of 160 ± 1° with contact angle hysteresis (CAH) of 2.1 ± 1°, which is obtained under optimum Electrodeposition conditions based on a 0.4 molar ratio of Ni2 +/SA solution. The corrosion resistance properties calculated from the Tafel curve of superhydrophobic surfaces prepared in this solution are 280 times larger than the chemically cleaned aluminum alloy substrate. Furthermore, electrochemical impedance spectroscopy (EIS) analysis demonstrates that the charge transfer resistance is 1.63 × 107 Ω·cm2 for superhydrophobic films (Ni2 +/SA = 0.4) compared to that of chemically cleaned aluminum alloy substrates (1.56 × 103 Ω·cm2). Therefore, the superhydrophobic film of Ni(SA)2 on the chemically cleaned aluminum alloy substrate improves the corrosion resistance performance of aluminum substrates in corrosive environments.
F Ashrafizadeh - One of the best experts on this subject based on the ideXlab platform.
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relationship between the structure and water repellency of nickel cobalt alloy coatings prepared by Electrodeposition Process
Surface & Coatings Technology, 2015Co-Authors: S Khorsand, K Raeissi, F Ashrafizadeh, M A ArenasAbstract:Abstract The combination of suitable hierarchical structure and low surface energy plays a vital role in fabricating super-hydrophobic coatings on hydrophilic metal substrates. The present study introduces a highly anti-corrosion and self-cleaning super-hydrophobic Ni–Co alloy coating fabricated by Electrodeposition Process. Based on the structures grown at various Process parameters, different morphologies including nano-cones and flower-like were obtained. The relation between surface morphologies and wettability behavior was investigated in detail. The surface of Ni–Co coatings freshly grown on copper substrate was super-hydrophilic with water contact angle below 10°. However, without further Processing, the wettability transited from super-hydrophilic nature to a super-hydrophobic one by passing time under ambient condition. The results showed that when the deposition current density falls in the range 20–30 mA cm − 2 with times longer than 600 s, the water contact angle on the Ni–Co coating was as high as 160°, and sliding angle was ultra-low (below 5°). A detailed XPS analysis indicated that this wettability transition was mainly caused by adsorption of airborne hydrocarbons onto the coating surface. The potentiodynamic polarization curves revealed that the super-hydrophobic film has considerably improved the corrosion performance of the Ni–Co alloy coating. Moreover, the super-hydrophobic surface showed a strong self-cleaning property.
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corrosion resistance and long term durability of super hydrophobic nickel film prepared by Electrodeposition Process
Applied Surface Science, 2014Co-Authors: S Khorsand, K Raeissi, F AshrafizadehAbstract:Abstract A super-hydrophobic nickel film with micro-nano structure was successfully fabricated by Electrodeposition Process. By controlling Electrodeposition parameters and considering different storage times for the coatings in air, various nickel films with different wettability were fabricated. Surface morphology of nickel films was examined by means of scanning electron microscopy (SEM). The results showed that the micro-nano nickel film was well-crystallized and exhibited pine cone-like microstructure with nano-cone arrays randomly dispersed on each micro-protrusion. The wettability of the micro-nano nickel film varied from super-hydrophilicity (water contact angle 5.3°) to super-hydrophobicity (water contact angle 155.7°) by exposing the surface in air at room temperature. The corrosion resistance of the super-hydrophobic film was estimated by electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. The potentiodynamic curves revealed that the corrosion rate of superhydrophobic surface was only 0.16% of the bare copper substrate. Moreover, EIS measurements and appropriate equivalent circuit models revealed that the corrosion resistance of nickel films considerably improved with an increase in the hydrophobicity. The superhydrophobic surface also exhibited an excellent long-term durability in neutral 3.5 wt.% NaCl solution.
Zhen Yang - One of the best experts on this subject based on the ideXlab platform.
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fabrication of super hydrophobic nickel film on copper substrate with improved corrosion inhibition by Electrodeposition Process
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Zhen Yang, Yanling TianAbstract:Abstract Inspired by the famous “lotus effect”, we have fabricated the super-hydrophobic surfaces with nickel film on copper substrates using a one-step Electrodeposition method. By adjusting Processing time, water contact angle of as-prepared surfaces can reach as high as 160.3 ± 1.5° with small rolling angle of 3.0 ± 0.5°, showing excellent super-hydrophobicity. After the deposition of nickel coating, the pristine copper surfaces became much rough with packed cauliflower-/thorn-like clusters. This unique surface texture contributed to trapping large amount of air and forming the air cushion underneath the water droplet, which can prevent the liquids contacting the copper substrate. The examination of surface chemical compositions implied that the deposited super-hydrophobic coating consisted of nickel crystals and nickel myristate. In this research, the formation mechanism of the electrodeposited super-hydrophobicity was extensively explained based on the analyses of surface texture and surface chemistry. Moreover, the corrosion resistance of the as-fabricated super-hydrophobic surface was estimated by the potentiodynamic polarization tests as well as the electrochemical impedance spectroscopy (EIS) measurements. The results demonstrate that the super-hydrophobic nickel coating showed excellent corrosion inhibition in simulated seawater solution. The existence of the super-hydrophobic coating could be regarded as a barrier and thus provide a perfect air-liquid interface that inhibits the penetration of the corrosive ions. This facile and effective method of Electrodeposition Process offers a promising approach for mass production of super-hydrophobic surfaces on various metals.