鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
論文
溶融Zn-0.2Al浴に浸漬したFe-Si合金におけるFe2Al5相の形成
高田 尚記 早野 邦尚鈴木 飛鳥小橋 眞
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2019 年 105 巻 7 号 p. 701-708

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We have characterized η-Fe2Al5 phase layers formed on Fe-Si binary alloys (pure Fe, Fe-0.2Si and Fe-1Si (wt%)) hot-dipped in a Zn-0.2Al (wt%) alloy melt at 460ºC for various times ranging from 2 to 3600 s. The Al addition in the Zn melt suppressed the interfacial reaction between liquid Zn and α-Fe phase with Si in solution. At an early stage of dipping (less than 10 s), Fe dissolution into the Zn-0.2Al alloy melt occurs more significantly on the α-Fe phase with higher Si content. The thickness of Fe2Al5 phase layer becomes slightly larger on α-Fe phase with higher Si content. These indicates that solute Si in α-Fe phase could enhance the Fe dissolution providing the driving force for the formation of η phase in liquid Zn alloy, resulting in the enhanced formation of η phase layer. The thicker η phase layer formed on Fe-Si alloy sheets would play a role of diffusion barrier, resulting in the suppression of subsequent interfacial reactions even after 3600 s in dipping.

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