Long-term corrosion behavior of CVD SiC in 360°C water and 400°C steam

腐蚀 溶解 高压灭菌器 材料科学 冶金 水蒸气 氧化物 包层(金属加工) 氧气 化学 有机化学 物理化学
作者
Jeong-Yong Park,Il-Hyun Kim,Yang‐Il Jung,Hyung‐Il Kim,Dong-Jun Park,Weon-Ju Kim
出处
期刊:Journal of Nuclear Materials [Elsevier BV]
卷期号:443 (1-3): 603-607 被引量:55
标识
DOI:10.1016/j.jnucmat.2013.07.058
摘要

Long-term corrosion tests were performed using chemical vapor deposition (CVD) SiC specimens in 360 °C water and 400 °C steam to evaluate the corrosion behavior of SiC cladding under normal operation conditions. The CVD SiC specimens exhibited weight loss caused by dissolution in both 360 °C water and 400 °C steam. For the corrosion test in 360 °C water the dissolution rate was much higher in the static autoclave, where the dissolved oxygen content was higher, than in the loops, where the dissolved oxygen content was maintained at approximately 5 ppb. The grain boundaries of the SiC dissolved preferentially during the early stage of corrosion, and the grains became thinner and detached from the surface, thereby leading to an acceleration of the weight loss. The pre-oxide was not able to protect the SiC from dissolving in water, even though it was effective, to a certain extent, at mitigating the dissolution of the SiC. In the corrosion test in 400 °C steam, the weight loss was significant from the early stage of corrosion. No acceleration in the corrosion rate was observed in 400 °C steam for up to 135 days, and the weight loss at 90 days was similar to that obtained from the 360 °C water autoclave test.
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