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Anodizing Aluminum and Its Alloys in Etidronic Acid to Enhance Their Corrosion Resistance in a Sodium Chloride Solution

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Title: Anodizing Aluminum and Its Alloys in Etidronic Acid to Enhance Their Corrosion Resistance in a Sodium Chloride Solution
Authors: Kikuchi, Tatsuya Browse this author →KAKEN DB
Suzuki, Yusuke Browse this author
Iwai, Mana Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Keywords: Aluminum
Corrosion-resistant film
NaCl solution
Issue Date: 9-Jan-2020
Publisher: The Electrochemical Society
Journal Title: Journal of the electrochemical society
Volume: 167
Issue: 12
Start Page: 121502
Publisher DOI: 10.1149/1945-7111/abaa6b
Abstract: The formation behaviors of the anodic oxide film that forms on various commercially available aluminum plates were investigated by galvanostatic anodizing in etidronic acid, and their corrosion resistances were examined in a 3.5 wt% NaCl solution. High-purity aluminum and A1050, A5052, and A7075 aluminum alloys were galvanostatically anodized in an etidronic acid solution. An amorphous porous oxide film formed on the pure aluminum, the A1050 alloy, and the A5052 alloy, whereas a plasma electrolytic oxidation (PEO) film formed on the A7075 alloy. The nanopores formed in the porous oxide film could be sealed with hydroxides by immersion in boiling water. Corrosion-resistant pure aluminum with a measured corrosion current density ofi(corr)= 10(-9)Am(-2)could be formed by anodizing and subsequent pore-sealing. Although the corrosion current increased due to the presence of alloying elements in the matrix, the fabrication of the corrosion-resistant A1050 and A5052 alloys withi(corr)= 10(-6)Am(-2)could also be achieved by anodizing. Alternately, the corrosion resistance of the A7075 alloy covered with the PEO film was measured to bei(corr)= 10(-4)Am(-2), which is not as small as thei(corr)of the A1050 and A5052 alloys due to its open microporous structure.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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