Effect of Propanol on Growth Rate of Anodic Porous Alumina in Sulfuric Acid

Asoh, Hidetaka; Kadokura, Haruka; Murohashi, Ryohei; Matsumoto, Mikimasa

doi:10.1149/1945-7111/ac80d5

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…In our preceding studies, anodization was conducted at a constant current of 100 A m −2 using sulfuric-acid-based and oxalic-acidbased electrolytes, enriched with either a monohydric (methanol, ethanol, or propanol) or a polyhydric alcohol (ethylene glycol or glycerol). [8][9][10][11][12] We observed an increase in maximum attainable film thickness with the addition of these alcohols. Similar enhancements in film properties by alcohol addition have been reported in other studies using standard electrolytes like sulfuric, oxalic, and phosphoric acids.…”

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confidence: 65%

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Asoh,

Ota,

Hagiwara

2024

J. Electrochem. Soc.

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Aluminum was anodized in a phosphoric acid solution containing glycerol. Anodization in high concentration and high temperature electrolytes typically faces challenges due to the chemical dissolution of the anodic film. However, we found that the maximum attainable film thickness could be doubled by incorporating glycerol into the electrolyte. This enhancement was more effective under conditions of high concentration and temperature than in environments with lower concentrations and temperatures.

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confidence: 65%

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Asoh,

Ota,

Hagiwara

2024

J. Electrochem. Soc.

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“…Existing experimental results suggest that the film growth rate increases with the acid concentration 34 – 37 . This is similar to our conclusion, as the growth rate is positively correlated with IDC and ion mobility.…”

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confidence: 99%

An ab initio molecular dynamics investigation of the behaviour of amorphous substances in anodic aluminium oxide under electric field

An,

Sun,

Dong

2024

Sci Rep

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In order to elucidate the diffusion behaviour of ions in alumina during the anodic alumina process, the effects of electric field strength, hydration content, and electrolyte on amorphous alumina and hydrated alumina were studied using ab initio molecular dynamics. The results show that the diffusion rate of ions in alumina increases with the increase in electric field strength, but there is an extreme value. The maximum diffusion rate of Al ions in alumina monohydrate is 21.8 μm2/ms/V, while in alumina trihydrate, it is 16.7 μm2/ms/V. The ionic diffusion rate of hydrated alumina is one to two orders of magnitude larger than that of anhydrous amorphous alumina due to the effect of the drag of H ions, which reduces the migration activation energy. Electrolytes also affect the diffusion rate of alumina through the action of H ions. The increase in H ions will not only enhance the diffusion rate of hydrated alumina but also render the hydrous compound more vulnerable to breakdown.

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Anodization of Aluminum in a Sodium Hydroxide Solution: Effect of pH on Chemical Dissolution

Asoh,

Fukumoto,

Shishido

et al. 2024

J. Electrochem. Soc.

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The chemical dissolution of anodic alumina film was investigated using the re-anodization technique. The formation of thick oxide films in an alkaline electrolyte is thought to be difficult to achieve due to the high pH value and high solubility of anodic alumina. The dissolution rate of anodic film was found to be strongly affected by the pH of the solution used for chemical dissolution; the film dissolved significantly faster in a sodium hydroxide solution having a high pH of 13.11 than in acidic solutions commonly used for anodization, such as sulfuric acid (pH 0.98) and phosphoric acid (pH 1.54). Nevertheless, the addition of glycerol to the sodium hydroxide solution effectively suppressed the chemical dissolution of the anodic film. The change in solubility of the anodic alumina film in solution was greatly affected by the change in the dissociation of the solute in solution. The results demonstrated that oxide films more than 10 μm thick were produced in an alkaline electrolyte by adding glycerol to the solution. The suppression of the chemical dissolution of alumina by the addition of alcohol has thus been shown to occur not only in acid solutions but also in alkaline solutions.

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Effect of Propanol on Growth Rate of Anodic Porous Alumina in Sulfuric Acid

Cited by 3 publications

References 36 publications

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

An ab initio molecular dynamics investigation of the behaviour of amorphous substances in anodic aluminium oxide under electric field

Anodization of Aluminum in a Sodium Hydroxide Solution: Effect of pH on Chemical Dissolution

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