Air-Impregnated Nanoporous Anodic Aluminum Oxide Layers for Enhancing the Corrosion Resistance of Aluminum

Jeong, Chanyoung; Lee, Junghoon; Sheppard, Keith; Choi, Changhwan

doi:10.1021/acs.langmuir.5b02392

Cited by 76 publications

(50 citation statements)

References 56 publications

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“…The oxide pore structures enhance the wettability of water to the surface by increasing the surface roughness, rendering the Wenzel state . In contrast, the contact angle of a water droplet on T‐AAO was 143° ± 3°, which is significantly larger than that on Al, implying the Cassie–Baxter state and air remains within the pores . The low contact angle with oil (5° ± 3°, in Figure e) but the large contact angle with water (143° ± 3°) of the T‐AAO surface indicates that the T‐AAO surface is far more wettable to oil than water, implying that the Teflon coating on the AAO surface allows not only to impregnate but also to retain the oil in the pores under an aqueous environment.…”

Section: Resultsmentioning

confidence: 95%

“…Recently, hydrophobic coatings (e.g., self‐assembled monolayers) on textured hydrophilic metallic surfaces have been shown to improve corrosion resistance, making the surfaces superhydrophobic . Such a superhydrophobic surface can create a composite interface where the voids formed by surface textures are filled with air, rendering the Cassie–Baxter wetting state .…”

Section: Introductionmentioning

confidence: 99%

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Oil‐Impregnated Nanoporous Oxide Layer for Corrosion Protection with Self‐Healing

Lee

Shin

Jiang

et al. 2017

Adv Funct Materials

Self Cite

111

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The major drawback of current passivation techniques for preventing corrosion is the lack of ability to withstand any external damages or local defects. In this study, oil‐impregnated nanoporous anodic aluminum oxide (AAO) layers are investigated to overcome such limitations and thus advance corrosion protection. By completely filling hydrophobized nanopores with oil via a solvent exchange method, a highly water‐repellent surface that prevents the penetration of corrosive media into the AAO layer and hence the corrosion of aluminum is achieved. The impregnation of oil into the hydrophobic nanoporous AAO layer enhances the corrosion resistance of an AAO layer by two and four orders of magnitude compared to that of a hydrophobic (i.e., air‐entrained) and a bare (hydrophilic) AAO, respectively. In the presence of local defects, the oil impregnated within the hydrophobic nanoporous AAO layer naturally permeates into the defects and ultimately inhibits the exposure of the aluminum surface to corrosive media. Whereas the corrosion current density of the air‐entrained hydrophobic AAO layer increases by more than 30 times after cracks, that of the oil‐impregnated AAO layer increases by no more than 4 times, showing superior anticorrosion property even after there are cracks, owing to the effective self‐healing capability.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Oil‐Impregnated Nanoporous Oxide Layer for Corrosion Protection with Self‐Healing

Lee

Shin

Jiang

et al. 2017

Adv Funct Materials

Self Cite

111

View full text Add to dashboard Cite

show abstract

“…One method is to fill the pores with solid-state oxide materials such as hydrothermal, dichromate, and nickel-salt [18,21,22]. Another solution is the coating because the hydrophobic coatings on the hydrophilic metallic surface make the surface superhydrophobic [23][24][25][26][27]. A further solution is oil impregnation.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application

Seo¹,

Jung²,

Chung

et al. 2019

Applied Sciences

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This study investigated the corrosion resistance of oil impregnated anodic aluminum oxide (AAO) surfaces of aluminum 7075 for subsea application. Although aluminum 7075 has high strength, it is scarcely used in the subsea industry because of its corrosion issue. Some treatment of aluminum 7075 is required for subsea application. In this study not only a plate shape but also a cylindrical shape were investigated because a cylindrical shape is frequently used in the subsea industry for electronic device housing. Contact angles of bare aluminum and oil impregnated AAO surfaces of aluminum 7075 were measured after a salt spray test and a pressure test. The results showed that the contact angle of bare aluminum was considerably decreased after the salt spray test, whereas the oil impregnated AAO surface presented a relatively high contact angle after the salt spray test and the pressure test. These results showed that the corrosion resistance of aluminum 7075 could be enhanced by oil impregnation on the AAO surface, and thus can be utilized in the subsea industry.

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“…Nanotitania has been regarded as the most promising semiconductor catalyst and environmentally friendly photocatalytic material, owing to its impressive photocatalysis, hydrophilicity, high electron-hole counter potential, and good physiochemical stability, low cost, non-toxicity and ready availability [19][20][21][22][23][24]. As a consequence, nanotitania has been extensively explored across various scientific disciplines [21,22,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, nanotitania can be used to seal aluminum oxide for corrosion resistance and UV-protection by virtue of the commonly-known physiochemical stability and UVshielding performance of the nanotitania [42,43]. However, it remains a great challenge to use nanotitania as a hole sealing material for AAO film [23][24][25][26][27][28][29][30][31][32][33][34] This study aims to grow a layer of nanotitania film for the purpose of sealing the holes of the AAO film on the aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Sealing Holes of an Anodic Aluminum Oxide Alloy by Nanotitania for Enhanced Corrosion Resistance

Chang¹,

Wei²,

Chen³

et al. 2017

Nano Res Appl

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This study aims to explore an effective, novel, and environmentally friendly method that overcomes the limitations and shortcomings existing in the traditional approaches for sealing holes on aluminum alloy. Herein, the holesealing treatment of an Anodic Aluminum Oxide (AAO) alloy film using two types of titanium sources with a high stability in aqueous electrolytes, that is, ammonium fluorotitanate and titanium potassium oxalate, to electrically deposit nanotitania on the film surface was investigated. The nanotitania deposited electrochemically for hole sealing has the advantages of the high physiochemical stability, low cost, and non-toxicity, which can thus readily improve the corrosion resistance of the sealed AAO in an environmentally friendly manner. Such sealed AAO can also result in a UV-shielding performance due to the commonly-known UV absorption properties of nanotitania. The hole sealing effect is also compared between the two systems involving the two types of titanium sources at different concentrations, voltages and time. The optimization of the preparation conditions is achieved by means of weight loss measurements. Potentiodynamic scan and electrochemical impedance spectroscopy results reveal that the hole-sealed sample-based on ammonium fluorotitanate shows a higher corrosion resistance as compared to the one based on titanium potassium oxalate. Significantly, the optimal conditions for the hole sealing of the aluminum alloy are evidenced to be the concentration of ammonium fluorotitanate of 0.1 mol/L, AC voltage of 3 V, and time of 900 s.

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Air-Impregnated Nanoporous Anodic Aluminum Oxide Layers for Enhancing the Corrosion Resistance of Aluminum

Cited by 76 publications

References 56 publications

Oil‐Impregnated Nanoporous Oxide Layer for Corrosion Protection with Self‐Healing

Oil‐Impregnated Nanoporous Oxide Layer for Corrosion Protection with Self‐Healing

Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application

Sealing Holes of an Anodic Aluminum Oxide Alloy by Nanotitania for Enhanced Corrosion Resistance

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