Abstract
Anodic 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.
About the authors
Hideaki Takahashi graduated with a doctoral course in applied chemistry from the Graduate School of Engineering, Hokkaido University, in 1973. He worked for the Faculty of Engineering, Hokkaido University between 1973 and 2008 and Asahikawa National College of Technology between 2008 and 2014. He has been the Director of Nippon Chemi-Con Corporation since 2014. His research topic is Al surface science and technology based on anodizing.
Makoto Chiba graduated with a doctoral course in molecular chemistry from the Graduate School of Engineering, Hokkaido University in 2004. He has worked for the Department of Materials Chemistry, National Institute of Technology, Asahikawa College since 2004. His research topic is the corrosion science of Al and its alloys as well as iron and steels.
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