Role of anodic oxide films in the corrosion of aluminum and its alloys

AbstractAnodic oxide films on aluminum are classified into two groups: porous-type anodic oxide films (PAOF) and barrier-type anodic oxide films (BAOF). The present paper is a review of the corrosion of pure aluminum (Al) and Al alloys covered with PAOF and BAOF, focusing on the role of anodic oxide films in the process of corrosion. Several topics are discussed in detail, including (a) changes in the dissolution mode of PAOF in acidic media by pore sealing, (b) hydration and dissolution of BAOF in pure water and neutral solutions containing organic and inorganic electrolytes, (c) pitting corrosion during the cathodic polarization of Al covered with PAOF and BAOF, (d) corrosion of PAOF-covered Al/Bi/Sn alloys in alcohols at 142°C, and (e) synergistic effects of Cl− and Cu2+ ions in the corrosion of PAOF-covered Al alloys in aqueous solutions.

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Infrared reflectance spectra of barrier-type anodic oxide films formed on pure aluminum

Thin Solid Films ◽

10.1016/0040-6090(70)90023-4 ◽

1970 ◽

Vol 6 (1) ◽

pp. R17-R19 ◽

Cited By ~ 18

Author(s):

T. Takamura ◽

H. Kihara-Morishita ◽

U. Moriyama

Keyword(s):

Pure Aluminum ◽

Oxide Films ◽

Anodic Oxide ◽

Reflectance Spectra ◽

Infrared Reflectance ◽

Anodic Oxide Films ◽

Barrier Type

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The Electrochemical Properties and Mechanism of Formation of Anodic Oxide Films on Mg-Al Alloys

Bulletin of the Korean Chemical Society ◽

10.5012/bkcs.2003.24.7.975 ◽

2003 ◽

Vol 24 (7) ◽

pp. 975-980 ◽

Cited By ~ 8

Keyword(s):

Electrochemical Properties ◽

Oxide Films ◽

Anodic Oxide ◽

Al Alloys ◽

Mechanism Of Formation ◽

Anodic Oxide Films

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Electrochemical Behavior of Thin Anodic Oxide Films on Zircaloy‐4: Role of the Mobile Defects

Journal of The Electrochemical Society ◽

10.1149/1.1837314 ◽

1996 ◽

Vol 143 (12) ◽

pp. 3902-3909 ◽

Cited By ~ 10

Author(s):

R. Salot ◽

F. Lefebvre‐Joud ◽

B. Baroux

Keyword(s):

Electrochemical Behavior ◽

Oxide Films ◽

Anodic Oxide ◽

Anodic Oxide Films

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Development of novel surface treatments for corrosion protection of aluminum: self-repairing coatings

Corrosion Reviews ◽

10.1515/corrrev-2017-0056 ◽

2018 ◽

Vol 36 (1) ◽

pp. 55-64 ◽

Cited By ~ 4

Author(s):

Makoto Chiba ◽

Chinami Yamada ◽

Haruka Okuyama ◽

Minori Sugiura ◽

Sven Pletincx ◽

...

Keyword(s):

Liquid Surface ◽

Oxide Films ◽

Mechanical Damage ◽

Anodic Oxide ◽

Al Alloys ◽

Organic Coatings ◽

Al Alloy ◽

Polyurethane Coating ◽

Anodic Oxide Films ◽

Inhibitor Solution

AbstractTwo types of self-repairing coatings for the protection of Al and its alloys are reviewed: (1) organic coatings with capsules containing repairing agent and (2) porous anodic oxide films with inhibitor solution stored in the pores of the oxide film. First, polyurethane microcapsules containing liquid surface-repairing agents were synthesized and polyurethane coating with the capsules was painted on Al alloy specimens. After mechanical damage to the coating, self-repairing occurred by the reaction of water vapor in the air with the repairing agents released from the capsules. Second, porous-type anodic oxide films were formed on Al alloys, and the pores of the anodic oxide films were filled with inhibitor solutions, followed by application of a covering polyurethane layer. Inhibitors released from the pores efficiently protected the Al alloy substrate from corrosion arising from induced mechanical damage.

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