Article
The Corrosion Behavior of Ni₃(Si,Nb) Alloys in Boiling 70 wt.% Sulfuric Acid
Journal of Materials Engineering and Performance
Abstract
Corrosion-resistant Ni3(Si,Nb) alloys are promising materials of construction for hydrogen-production systems based on the sulfur-iodine thermochemical cycle. In this work, the corrosion rates of three differentNi3(Si,Nb) alloys were measured in boiling 70 wt.% sulfuric acid and a three-stage corrosion mechanism was identified, based on the composition and morphology of surface scale that developed. The α(Ni) +β(Ni3Si) eutectic constituent of the alloy microstructure was selectively attacked by acid and, when present, is detrimental to corrosion resistance. The G-phase (Ni16Si17Nb6) is more passive than the β-matrix and seems to contribute to a lower steady-state corrosion rate.
Department(s)
Materials Science and Engineering
Keywords and Phrases
- Corrosion,
- Corrosion Rate,
- Corrosion Resistance,
- Hydrogen Production,
- Iodine,
- Nickel,
- Silicon,
- Sulfur,
- Sulfuric Acid,
- Alloy Microstructure,
- Corrosion Mechanisms,
- Hydrogen Production Systems,
- Materials of Constructions,
- Morphology of Surfaces,
- Ni-Si Alloy,
- Sulfur-Iodine Cycles,
- Thermochemical Cycles,
- Silicon Alloys,
- Ni-Si Alloys,
- Sulfur-Iodine Cycle
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2016 Springer Verlag, All rights reserved.
Publication Date
2-1-2016
Publication Date
01 Feb 2016
Disciplines
Citation Information
Jen-Hsien Hsu, Christopher M. Larson, Joseph William Newkirk, Richard K. Brow, et al.. "The Corrosion Behavior of Ni₃(Si,Nb) Alloys in Boiling 70 wt.% Sulfuric Acid" Journal of Materials Engineering and Performance Vol. 25 Iss. 2 (2016) p. 510 - 517 ISSN: 1059-9495 Available at: http://works.bepress.com/richard-brow/171/