日本金属学会誌

J. Japan Inst. Metals, Vol. 36, No. 2 (1972),
pp. 139-143

Anodic Behavior of Fe-Ti Alloys

Kyuya Nagasaki1, Shiro Haruyama1, Teruo Miyashita2 and Satoru Asawa3

1Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology, Tokyo
2Graduate School, Tokyo Institute of Technology, Tokyo. Present address: Nippon Light Metal Research Laboratory Ltd., Shizuoka Prefecture
3Graduate School, Tokyo Institute of Technology, Tokyo

Abstract:

The anodic behavior of Fe-Ti alloys (0.2 ∼ 7.5Ti wt%) was investigated in acidic (pH 3.50) and alkaline (pH 8.40) solutions by using an electronic potentiostat. The results are summarized as follows: (1) The potentiostatic transient current of the alloys decreased in reverse proportion to time in the passive region. (2) In α single phase alloys the Flade potential observed in the acidic solution shifted to the noble direction with increasing Ti content. As to α + TiFe2 alloys, however, they remained constant regardless of Ti content. Therefore it was concluded that the Flade potential of Fe-Ti alloys was controlled by the α matrix. (3) The anodic current in the passive range decreased with increasing Ti content in the acidic solution, while it increased in borate-boric acid solution. (4) Transpassive dissolution was observed at about 1100 mV (vs. S.C.E.). Especially in α + TiFe2 alloys, a sharp current increase was observed, due to a combined effect of the transpassive dissolution of the α matrix and the fall-off of TiFe2.


(Received 1971/10/15)

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