High Corrosion Resistant Ni-Based Glassy Alloys in Boiling Nitric Acid Solutions

C. L. Qin; K. Asami; H. Kimura; W. Zhang; D. V. Louzguine; A. Inoue

doi:10.2320/matertrans.ME200814

C. L. Qin, K. Asami, H. Kimura, W. Zhang, D. V. Louzguine, A. Inoue

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Keywords: glassy alloys, corrosion resistance, nitric acid, polarization curves, X-ray photoelectron spectroscopy (XPS) analysis

JOURNAL FREE ACCESS

2009 Volume 50 Issue 6 Pages 1304-1307

DOI https://doi.org/10.2320/matertrans.ME200814

View "Advance Publication" version (May 20, 2009).

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Abstract

The Ni₅₇Nb₁₉Zr₁₉Ta₅ glassy alloy possesses high corrosion resistance in severe environments, i.e. boiling 6 N HNO₃ and 6 N HNO₃ + 5 g/l Cr⁶⁺ solutions. In both solutions, the corrosion resistance of the Ni₅₇Nb₁₉Zr₁₉Ta₅ alloy is much better than that of NAR-310Nb stainless steel which is developed as nitric acid corrosion resistant stainless steel. XPS analysis reveals that the high corrosion resistance of the Ni-based glassy alloys is due to the formation of the highly protective passive film composed exclusively of Nb⁵⁺ and Ta⁵⁺ cations after immersion in the solution without Cr⁶⁺ ions, and Nb⁵⁺, Ta⁵⁺ and Cr³⁺ cations after immersion in the solution with Cr⁶⁺ ions.

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