SYMPOSIA PAPER Published: 01 January 2000
STP14320S

Fundamental Study on the Corrosion Mechanism of Zr-0.2Fe, Zr-0.2Cr, and Zr-0.1Fe-0.1Cr Alloys

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Corrosion and hydrogen pickup properties were investigated on sheet materials of pure Zr, Zr-0.2 wt%Fe, Zr-0.2 wt%Cr, and Zr-0.1 wt%Fe-0.1 wt%Cr which were given an intermediate anneal of 853 K or 1003 K, and a final anneal at 853 K. To clarify the substantial effects of iron and chromium, impurities were minimized by using crystal bar zirconium and pure alloy additions.

Corrosion results in 633 K water showed that Zr had the lowest corrosion resistance and that Zr-0.1Fe-0.1Cr alloy heat treated at 1003 K had the highest. The alloys heat-treated at 1003 K showed higher corrosion resistance that those treated at 853 K for each composition except the Zr-0.2Fe alloy. Zr-0.2Fe alloys had higher hydrogen pickup ratios (80%) than those of Zr-0.2Cr and Zr-0.1Fe-0.1Cr alloys (10 to 20%).

TEM and HR-SEM examination of oxide cross sections was also performed. Zr-0.1Fe-0.1Cr alloy formed columnar oxide grains with few fine cracks, while Zr and Zr-0.2Cr alloys had fine-equiaxed grains. Zr-0.2Fe alloys formed columnar oxide grains and included many lateral cracks.

The corrosion mechanism of the alloys was associated with the electrochemical characteristics of the precipitates in this study.

Author Information

Murai, T
Central Research Institute, Mitsubishi Materials Corporation, Saitama, Japan
Isobe, T
Central Research Institute, Mitsubishi Materials Corporation, Saitama, Japan
Takizawa, Y
Central Research Institute, Mitsubishi Materials Corporation, Saitama, Japan
Mae, Y
Central Research Institute, Mitsubishi Materials Corporation, Saitama, Japan
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Details
Developed by Committee: B10
Pages: 623–640
DOI: 10.1520/STP14320S
ISBN-EB: 978-0-8031-5416-2
ISBN-13: 978-0-8031-2499-8