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Anodizing

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Ryosuke O. Suzuki – 1st expert on this subject based on the ideXlab platform

  • Advanced hard anodic alumina coatings via etidronic acid Anodizing
    Surface & Coatings Technology, 2017
    Co-Authors: Tatsuya Kikuchi, Shungo Natsui, Akimasa Takenaga, Ryosuke O. Suzuki

    Abstract:

    Abstract Advanced hard anodic alumina coatings measuring Hv = 610–769 on the Vickers hardness scale were obtained on an aluminum surface via aluminum Anodizing using a new electrolyte, etidronic acid. The ordered porous alumina was fabricated by two-step etidronic acid Anodizing at 260 V under self-ordering conditions, and pore-widening was carried out to control the porosity of the porous alumina. The Vickers hardness of the ordered porous alumina increased with decreasing diameter of the pores and porosity. Aluminum specimens were also anodized by the constant-current method under various concentrations, temperatures, and current densities. The Vickers hardness increased with decreasing concentration and temperature because chemical dissolution of the anodic oxide during Anodizing was suppressed. A hard porous alumina measuring Hv = 610 was obtained by Anodizing in a 0.05 M etidronic acid solution at 278 K and 5 Am − 2 . Subsequent thermal treatment caused the dehydration and corresponding hardening of the porous alumina, and a higher porous alumina hardness of Hv = 769 was successfully achieved by thermal treatment at 873 K for 12 h.

  • Superhydrophilic and superhydrophobic aluminum alloys fabricated via pyrophosphoric acid Anodizing and fluorinated SAM modification
    Journal of Alloys and Compounds, 2017
    Co-Authors: Ryunosuke Kondo, Daiki Nakajima, Tatsuya Kikuchi, Shungo Natsui, Ryosuke O. Suzuki

    Abstract:

    The fabrication of superhydrophilic and superhydrophobic aluminum alloys was achieved by pyrophosphoric acid Anodizing and SAM (self-assembled monolayer) modification. The Anodizing of three kinds of aluminum alloys, including 3004, 1N30, and 8021, in a concentrated pyrophosphoric acid solution resulted in the formation of numerous anodic alumina nanofibers. In addition, insoluble intermetallic compounds contained in the alloy matrix were exposed to the surface with increasing Anodizing time, and nanofiber-tangled intermetallic particles also formed on the surface during Anodizing. These anodized aluminum alloys exhibited a superhydrophilic behavior measuring less than 4° in the contact angle, and this superhydrophilicity was maintained via the long-term Anodizing process. The nanofiber-covered aluminum alloys were immersed in fluorinated phosphonic acid SAM/ethanol solutions, thereby modifying SAMs on the anodic alumina nanofibers. The contact angle of the SAM-modified aluminum alloys increased with the immersion time and temperature of the SAM solution, and the surface was drastically shifted to superhydrophobicity, measuring more than 150°, from superhydrophilicity. However, exceeding 10 min in the Anodizing process caused the contact angle to decrease and the gradual disappearance of hydrophobicity due to the formation of many hydrophilic intermetallic particles on the surface. The short-term pyrophosphoric acid Anodizing and subsequent SAM modification are useful for the formation of various superhydrophilic and superhydrophobic aluminum alloys.

  • Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing
    Electrochimica Acta, 2016
    Co-Authors: Shunta Akiya, Shungo Natsui, Tatsuya Kikuchi, Norihito Sakaguchi, Ryosuke O. Suzuki

    Abstract:

    Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical Anodizing in a new electrolyte, phosphonic acid (H3PO3). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and Anodizing time. Phosphonic acid Anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and Anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid Anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO32-anions originated from the electrolyte were incorporated into the porous oxide during Anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO32-anions, and a thin inner layer without anions was constructed via phosphonic acid Anodizing.

Tatsuya Kikuchi – 2nd expert on this subject based on the ideXlab platform

  • Advanced hard anodic alumina coatings via etidronic acid Anodizing
    Surface & Coatings Technology, 2017
    Co-Authors: Tatsuya Kikuchi, Shungo Natsui, Akimasa Takenaga, Ryosuke O. Suzuki

    Abstract:

    Abstract Advanced hard anodic alumina coatings measuring Hv = 610–769 on the Vickers hardness scale were obtained on an aluminum surface via aluminum Anodizing using a new electrolyte, etidronic acid. The ordered porous alumina was fabricated by two-step etidronic acid Anodizing at 260 V under self-ordering conditions, and pore-widening was carried out to control the porosity of the porous alumina. The Vickers hardness of the ordered porous alumina increased with decreasing diameter of the pores and porosity. Aluminum specimens were also anodized by the constant-current method under various concentrations, temperatures, and current densities. The Vickers hardness increased with decreasing concentration and temperature because chemical dissolution of the anodic oxide during Anodizing was suppressed. A hard porous alumina measuring Hv = 610 was obtained by Anodizing in a 0.05 M etidronic acid solution at 278 K and 5 Am − 2 . Subsequent thermal treatment caused the dehydration and corresponding hardening of the porous alumina, and a higher porous alumina hardness of Hv = 769 was successfully achieved by thermal treatment at 873 K for 12 h.

  • Superhydrophilic and superhydrophobic aluminum alloys fabricated via pyrophosphoric acid Anodizing and fluorinated SAM modification
    Journal of Alloys and Compounds, 2017
    Co-Authors: Ryunosuke Kondo, Daiki Nakajima, Tatsuya Kikuchi, Shungo Natsui, Ryosuke O. Suzuki

    Abstract:

    The fabrication of superhydrophilic and superhydrophobic aluminum alloys was achieved by pyrophosphoric acid Anodizing and SAM (self-assembled monolayer) modification. The Anodizing of three kinds of aluminum alloys, including 3004, 1N30, and 8021, in a concentrated pyrophosphoric acid solution resulted in the formation of numerous anodic alumina nanofibers. In addition, insoluble intermetallic compounds contained in the alloy matrix were exposed to the surface with increasing Anodizing time, and nanofiber-tangled intermetallic particles also formed on the surface during Anodizing. These anodized aluminum alloys exhibited a superhydrophilic behavior measuring less than 4° in the contact angle, and this superhydrophilicity was maintained via the long-term Anodizing process. The nanofiber-covered aluminum alloys were immersed in fluorinated phosphonic acid SAM/ethanol solutions, thereby modifying SAMs on the anodic alumina nanofibers. The contact angle of the SAM-modified aluminum alloys increased with the immersion time and temperature of the SAM solution, and the surface was drastically shifted to superhydrophobicity, measuring more than 150°, from superhydrophilicity. However, exceeding 10 min in the Anodizing process caused the contact angle to decrease and the gradual disappearance of hydrophobicity due to the formation of many hydrophilic intermetallic particles on the surface. The short-term pyrophosphoric acid Anodizing and subsequent SAM modification are useful for the formation of various superhydrophilic and superhydrophobic aluminum alloys.

  • Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing
    Electrochimica Acta, 2016
    Co-Authors: Shunta Akiya, Shungo Natsui, Tatsuya Kikuchi, Norihito Sakaguchi, Ryosuke O. Suzuki

    Abstract:

    Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical Anodizing in a new electrolyte, phosphonic acid (H3PO3). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and Anodizing time. Phosphonic acid Anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and Anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid Anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO32-anions originated from the electrolyte were incorporated into the porous oxide during Anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO32-anions, and a thin inner layer without anions was constructed via phosphonic acid Anodizing.

Shungo Natsui – 3rd expert on this subject based on the ideXlab platform

  • Advanced hard anodic alumina coatings via etidronic acid Anodizing
    Surface & Coatings Technology, 2017
    Co-Authors: Tatsuya Kikuchi, Shungo Natsui, Akimasa Takenaga, Ryosuke O. Suzuki

    Abstract:

    Abstract Advanced hard anodic alumina coatings measuring Hv = 610–769 on the Vickers hardness scale were obtained on an aluminum surface via aluminum Anodizing using a new electrolyte, etidronic acid. The ordered porous alumina was fabricated by two-step etidronic acid Anodizing at 260 V under self-ordering conditions, and pore-widening was carried out to control the porosity of the porous alumina. The Vickers hardness of the ordered porous alumina increased with decreasing diameter of the pores and porosity. Aluminum specimens were also anodized by the constant-current method under various concentrations, temperatures, and current densities. The Vickers hardness increased with decreasing concentration and temperature because chemical dissolution of the anodic oxide during Anodizing was suppressed. A hard porous alumina measuring Hv = 610 was obtained by Anodizing in a 0.05 M etidronic acid solution at 278 K and 5 Am − 2 . Subsequent thermal treatment caused the dehydration and corresponding hardening of the porous alumina, and a higher porous alumina hardness of Hv = 769 was successfully achieved by thermal treatment at 873 K for 12 h.

  • Superhydrophilic and superhydrophobic aluminum alloys fabricated via pyrophosphoric acid Anodizing and fluorinated SAM modification
    Journal of Alloys and Compounds, 2017
    Co-Authors: Ryunosuke Kondo, Daiki Nakajima, Tatsuya Kikuchi, Shungo Natsui, Ryosuke O. Suzuki

    Abstract:

    The fabrication of superhydrophilic and superhydrophobic aluminum alloys was achieved by pyrophosphoric acid Anodizing and SAM (self-assembled monolayer) modification. The Anodizing of three kinds of aluminum alloys, including 3004, 1N30, and 8021, in a concentrated pyrophosphoric acid solution resulted in the formation of numerous anodic alumina nanofibers. In addition, insoluble intermetallic compounds contained in the alloy matrix were exposed to the surface with increasing Anodizing time, and nanofiber-tangled intermetallic particles also formed on the surface during Anodizing. These anodized aluminum alloys exhibited a superhydrophilic behavior measuring less than 4° in the contact angle, and this superhydrophilicity was maintained via the long-term Anodizing process. The nanofiber-covered aluminum alloys were immersed in fluorinated phosphonic acid SAM/ethanol solutions, thereby modifying SAMs on the anodic alumina nanofibers. The contact angle of the SAM-modified aluminum alloys increased with the immersion time and temperature of the SAM solution, and the surface was drastically shifted to superhydrophobicity, measuring more than 150°, from superhydrophilicity. However, exceeding 10 min in the Anodizing process caused the contact angle to decrease and the gradual disappearance of hydrophobicity due to the formation of many hydrophilic intermetallic particles on the surface. The short-term pyrophosphoric acid Anodizing and subsequent SAM modification are useful for the formation of various superhydrophilic and superhydrophobic aluminum alloys.

  • Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing
    Electrochimica Acta, 2016
    Co-Authors: Shunta Akiya, Shungo Natsui, Tatsuya Kikuchi, Norihito Sakaguchi, Ryosuke O. Suzuki

    Abstract:

    Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical Anodizing in a new electrolyte, phosphonic acid (H3PO3). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and Anodizing time. Phosphonic acid Anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and Anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid Anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO32-anions originated from the electrolyte were incorporated into the porous oxide during Anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO32-anions, and a thin inner layer without anions was constructed via phosphonic acid Anodizing.