Materials Transactions Online

Materials Transactions, Vol.46 No.04 (2005) pp.858-862
© 2005 The Japan Institute of Metals

Effect of Tantalum on Corrosion Resistance of Ni--Nb(--Ta)--Ti--Zr Glassy Alloys at High Temperature

Chunling Qin1, Wei Zhang, Hiromichi Nakata2, Hisamichi Kimura, Katsuhiko Asami and Akihisa Inoue

Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
1Japan Science and Technology Agency, Sendai 980-8577, Japan
2Toyota Motor Corporation, Aichi 471-8571, Japan

Ni60Nb20-xTaxTi15Zr5 (x=0, 5, 15 and 20 at%) glassy alloys with high thermal stability and high corrosion resistance have been synthesized by the melt spinning technique. The substitution of tantalum for a portion of niobium in the Ni60Nb20Ti15Zr5 glassy alloy causes a significant increase in the supercooled liquid region (Δ Tx=Tx-Tg) from 52 K at 0 at% Ta to 67 K at 20 at% Ta accompanied by an increase in Tg and Tx. The glassy alloys are spontaneously passivated in a wide passive region and at low passive current densities of the order of 10-2 A⋅m-2 in pH 2 H2SO4 and pH 2 H2SO4 + 500 ppm NaCl solutions at a high temperature of 353 K. On the other hand, in pH 2 H2SO4 + 500 ppm NaF solution at 353 K, the alloys without Ta and with 5 at% Ta suffer general corrosion, while the passive current densities decrease by about two orders of magnitude with the addition of 15--20 at% Ta to the Ni--Nb--Ti--Zr glassy alloy. It indicates that the effect of the addition of tantalum is more pronounced for improving the corrosion resistance in fluoride containing solutions than the other two types of solutions.

(Received 2004/12/16; Accepted 2005/2/18; Published 2005/4/15)

Keywords: nickel-based glassy alloy, supercooled liquid region, thermal stability, polarization curve, high temperature

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