Effect of two-step anodizing on corrosion and adhesion resistance of A5052 aluminum alloy

In order to fabricate multi-materials such as joining between aluminum alloy and engineering plastics for the purpose of lightening the weight of automobiles, this study investigated surface treatments to improve the adhesion and corrosion resistance of A5052 aluminum alloy. The two-step anodizing p...

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Bibliographic Details
Published inJournal of Japan Institute of Light Metals Vol. 74; no. 8; pp. 346 - 351
Main Authors HINO, Makoto, SUGITA, Shoei, KUWANO, Ryoichi, NAGATA, Norihito, YAMASHITA, Michiru, KANADANI, Teruto
Format Journal Article
LanguageJapanese
English
Published Tokyo The Japan Institute of Light Metals 15.08.2024
Japan Science and Technology Agency
Subjects
A5052 aluminum alloy
Acid resistance
Adhesion
Aluminum base alloys
Anodizing
Corrosion effects
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
joining different materials
Phosphoric acid
Sulfuric acid
Surface treatment
Weight reduction
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Summary:In order to fabricate multi-materials such as joining between aluminum alloy and engineering plastics for the purpose of lightening the weight of automobiles, this study investigated surface treatments to improve the adhesion and corrosion resistance of A5052 aluminum alloy. The two-step anodizing process of phosphoric acid anodizing ＋ sulfuric acid formed a two-layer film with a phosphoric acid treated film on the upper layer and a sulfuric acid treated film on the lower layer. In this two-layer coating, the sulfuric acid-treated film on the lower layer improves the corrosion resistance, and the phosphoric acid-treated film on the upper layer improves adhesion, showing excellent adhesion and corrosion resistance.
ISSN:0451-5994
0368-5306
1880-8018
2186-618X
DOI:10.2464/jilm.74.346