日本金属学会誌

J. Japan Inst. Metals, Vol. 64, No. 3 (2000),
pp. 195-201

Chemical Corrosion Resistance Coating on Aluminum Substrates by the Sol--Gel Process

Shinji Hirai1, Kazuyoshi Shimakage1, Mikio Kondo2, Tomiyoshi Kanai2 and Kenji Wada3

1Department of Materials Science and Engineering, Faculty of Engineering, Muroran Institute of Technology, Muroran 050--8585
2Showa Aluminum Co., Oyama Works, Oyama 323--0811

3National Institute for Research in Inorganic Materials, Tsukuba 305--0044

Abstract:

To improve the corrosion resistance to salt, acid and strongly alkaline attack, a sol--gel film using zirconium tetra--n--butoxide as a starting material has been coated directly on the surface of aluminum substrates via repeating one or twice dip--coating process. The heat treatment at 573 K or the UV--irradiation at ambient temperature was performed for forming dense coating films after the dipping--withdrawing of aluminum substrate into the sol. Zirconium oxide films were prepared on aluminum surface by these sol--gel processes. The coating films formed on the smooth aluminum substrates under UV--irradiation indicated excellent corrosion resistance for salt, acid and alkaline attack tests. For example, the surface area of the coating film corroded for 3600 ks in salt attack test decreased in the order of sol--gel coating film°.


(Received August 30, 1999, In Final Form January 12, 2000)

Keywords:

zirconium oxide, aluminum substrate, sol--gel process, ultraviolet irradiation, corrosion resistance, salt, acid and alkaline attack tests, water--avid surface


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