Michihisa Fukumoto1, Tsuyosi Yokota1, Motoi Hara1 and Toshio Narita2
1Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502
A Ni aluminide layer containing Zr was formed on a Ni specimen by a synchronous electrodeposition of Al and Zr using molten-salt bath. Al and Zr were hardly electrodeposited and an electrodeposited layer was not formed when the simultaneous electrodeposition of Al and Zr was tried using molten NaCl-KCl containing 3.5 mol%AlF3 and 3.5 mol%ZrF4. On the other hand, the electrodeposited layer consisting of Ni2Al3 layer as an inner layer and NiAl3 layer as an outer layer, in which ZrAl3 particles were formed at the surface region, was formed when the simultaneous electrodeposition of Al and Zr was carried out using the molten NaCl-KCl containing 3.5 mol%AlF3 and 0.05 mol%ZrF4. The cyclic oxidation resistance of the Ni covered by the Ni aluminide containing Zr was evaluated in air at 1423 K. The specimen covered with the Ni aluminide containing the ZrAl3 particles, which was formed using the melt containing 3.5 mol%AlF3 and 0.05 mol%ZrF4, showed a high cyclic-oxidation resistance. On this specimen after the oxidation test, an adhesive scale having a spiked shape, which consisted of Al2O3, was formed.
synchronous electrodeposition, molten salt, zirconium, aluminum, cyclic oxidation, nickel aluminide, coating
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