Hot-dip coating has been practically employed in manufacturing zinc alloy coated steel sheets. However, it is difficult to coat aluminum alloy on a bulky steel substrate without sufficient preheating, because a rapidly solidified layer containing gas babbles is formed on a substrate surface. A variety of iron-aluminides are also formed at the interface of a steel and aluminum hot-dip coating system, which is the main difficulty in joining of steel with aluminum. Ultrasonic vibration was applied to a steel substrate during hot-dip coating of aluminum alloy to control a rapidly solidified layer and a brittle reaction layer. Hot dipping of columnar steel substrates into molten aluminum alloy (Al-2.7 mass fraction Si-4.6 mass fraction Sn) was carried out through the use of a Langevin oscillator with resonant frequency of 19.5 kHz. The application of ultrasonic vibration is quite effective to control a rapidly solidified layer and a surface oxide layer from a substrate surface by the sonocapillary effect based on a cavitation phenomenon, so that the intimate contact is achieved at the beginning of hot-dip coating. The application of ultrasonic vibration to hot-dipping is effective to control a reaction layer with less than 5μm in thickness. An impact test exhibits that the good adhesive strength is approved in hot-dipped aluminum coatings with a thin reaction layer of approximately 5μm.
参考文献
| [1] | F A Davis;T S Eyre .[J].Tribology International,1994,27:171. |
| [2] | M Gui;S B Kang;J M Lee .[J].Wear,2000,240:186. |
| [3] | T Desaki .[J].Journal of Japanese Society of Tribologists,2004,49:781. |
| [4] | Y Okamoto .[J].Journal of Japanese Society of Tribologists,2004,49:827. |
| [5] | Y Tsunekawa;M Okumiya;Y Furukawa;Y Genma .[J].Journal of JFS,1999,71:691. |
| [6] | S H Hwang;J H Song;Y S Kim .[J].Material Science and Engineering,2005,A390:437. |
| [7] | S Kobayashi;T Yakou .[J].Material Science and Engineering,2002,A338:44. |
| [8] | H Nakanishi;Y Tsunekawa;N Mohri;M Okumiya I Niimi .[J].Japanese Journal of Institute of Light Metals,1993,43:14. |
| [9] | Y Genma;Y Tsunekawa;M Okumiya;N Mohri.[J].Materials Transactions-Japan Institute of Metals,1997:38232. |
| [10] | A Inada;M Sakamoto .[J].JIDOSHA-GIJUTSU,1987,41:1575. |
| [11] | S P Gupta .[J].Materials Characterization,2003,49:269. |
| [12] | S P Gupta .[J].Materials Characterization,2003,49:293. |
| [13] | S Tamura;T Sato;Y Tsunekawa;M Okumiya Y Furukawa .[J].Journal of JFS,2005,77:752. |
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