Investigation of Hot Corrosion of (Al，Mn)3Ti-2V Intermetallics

Acta Metall Sin

2004, Vol. 40

Issue (2): 185-190 DOI:

Research Articles

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Investigation of Hot Corrosion of (Al，Mn)3Ti-2V Intermetallics

JIN Guangxi; LI Jinxu; QI Huibin; QIAO Lijie; GAO Kewei; HASHIMOTO Kenki; CHU Wuyang

Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083; Japan Society for the Promotion of Science; Tokyo 102-8471; Japan

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JIN Guangxi; LI Jinxu; QI Huibin; QIAO Lijie; GAO Kewei; HASHIMOTO Kenki; CHU Wuyang. Investigation of Hot Corrosion of (Al，Mn)3Ti-2V Intermetallics. Acta Metall Sin, 2004, 40(2): 185-190 .

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Abstract Hot corrosion behaviors of (Al, Mn)3Ti-2V and TiAl in (Na, K)2SO4 melt at 900℃ and in Na2SO4+NaCl melt at 850℃ were studied respectively. The cross-sectional morphologies and profiles of elements in the scale formed on (Al, Mn)3Ti-2V show that (Al, Mn)3Ti-2V has excellent hot corrosion resistance in (Na, K)2SO4 melt. The thin scale consists of an outer protective Al2O3 layer and an inner mixture layer of Al2O3, TiO2 and TiS. When NaCl was added in the Na2SO4 salts, however, the hot corrosion resistance of the (Al, Mn)3Ti-2V becomes very poor. The scale is thicker than that in the absence of NaCl by one hundred times of magnitude at least. The scale consists of three layers: an outer layer consisting of porous MnO plus a little Al2O3+TiO2, a middle layer of porous Al2O3 plus trace amount of TiS, and an inner layer of TiO2+TiS.

Key words: hot corrosion Na2SO4

Received: 17 March 2003

ZTFLH:	TG172.62
	TG146.2

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	JIN Guangxi
	LI Jinxu
	QI Huibin
	QIAO Lijie
	GAO Kewei
	HASHIMOTO Kenki
	CHU Wuyang

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I2/185

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