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

• Qin Chunling

  Japan Science and Technology Agency

• Zhang Wei

  Institute for Materials Research, Tohoku University

• Nakata Hiromichi

  Toyota Motor Corporation

• Kimura Hisamichi

  Institute for Materials Research, Tohoku University

• Asami Katsuhiko

  Institute for Materials Research, Tohoku University

• Inoue Akihisa

  Institute for Materials Research, Tohoku University

書誌事項

タイトル別名

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

抄録

Ni₆₀Nb_20−xTa_xTi₁₅Zr₅ (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 (ΔT_x=T_x−T_g) from 52 K at 0 at% Ta to 67 K at 20 at% Ta accompanied by an increase in T_g and T_x. 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.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 46 (4), 858-862, 2005

  公益社団法人 日本金属学会

キーワード

• nickel-based glassy alloy
• supercooled liquid region
• thermal stability
• polarization curve
• high temperature

詳細情報

• CRID: 1390001204249522048
• NII論文ID: 130004452777
• NII論文ID: 10015520766
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.46.858
• COI: 1:CAS:528:DC%2BD2MXlt1yitLY%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7304468
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7304468
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/46/4/46_4_858/_pdf
• 本文言語コード: en
• データソース種別:
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