The Corrosion Behavior of Ni3(Si,Nb) Alloys in Boiling 70 wt.% Sulfuric Acid

Corrosion-resistant Ni 3 (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 different Ni 3 (Si,Nb) alloys were measured in boiling 70 wt.% sulfuric acid and a three-stage c...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2016-02, Vol.25 (2), p.510-517
Main Authors: Hsu, Jen-Hsien, Larson, Christopher M., Newkirk, Joseph W., Brow, Richard K., Zhang, San-Hong
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Quality Control
Reliability
Safety and Risk
Tribology
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Summary:Corrosion-resistant Ni 3 (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 different Ni 3 (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(Ni 3 Si) eutectic constituent of the alloy microstructure was selectively attacked by acid and, when present, is detrimental to corrosion resistance. The G-phase (Ni 16 Si 17 Nb 6 ) is more passive than the β-matrix and seems to contribute to a lower steady-state corrosion rate.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-016-1883-0