Materials corrosion in molten LiF-NaF-KF eutectic salt under different reduction-oxidation conditions
Materials corrosion in molten LiF-NaF-KF eutectic salt under different reduction-oxidation conditions
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发表时间：
2012-07
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通讯作者：
M. Anderson;K. Sridharan;Chaur-Jeng Wang;T. Allen
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作者：
M. Anderson;K. Sridharan;Chaur-Jeng Wang;T. Allen
熔融氟化物盐如 FLiNaK（LiF-NaF-KF：46.5-11.5-42 mol%）已被建议用作二级反应堆冷却剂、将高温工艺热量从核反应堆转移到化工厂的介质，以及用于集中太阳能热能存储。在熔融氟化物盐中，钝化氧化物膜化学不稳定，腐蚀主要是由合金元素热力学驱动溶解到熔盐环境中引起的。将两种合金，哈氏合金{sup R} N 和 316L 不锈钢在 316L 不锈钢坩埚中在氩气保护下在 850 摄氏度下暴露于熔融 FLiNaK 盐中 1000 小时。 C. 一些坩埚中存在石墨，目的是研究相关反应器材料组合的腐蚀行为。此外，通过在系统中添加锆来测试通过改变氧化还原态来减少合金腐蚀的技术。 316L 不锈钢的腐蚀主要是通过表面铬的损耗而发生的，这种效应因石墨的存在而增强。哈氏合金{sup R} N 通过对 316L 不锈钢坩埚产生的腐蚀产物进行电化学电镀而导致重量增加。在存在锆的情况下，两种合金都通过镀锆而增加了重量，从而形成了金属间层。 （作者）« 少
Molten fluoride salts such as FLiNaK (LiF-NaF-KF: 46.5-11.5-42 mol %) have been proposed for use as secondary reactor coolants, media for transfer of high temperature process heat from nuclear reactors to chemical plants, and for concentrated solar power thermal energy storage. In molten fluoride salts, passive oxide films are chemically unstable, and corrosion is driven largely by the thermodynamically driven dissolution of alloying elements into the molten salt environment. Two alloys, Hastelloy{sup R} N and 316L stainless steel were exposed to molten FLiNaK salt in a 316L stainless steel crucible under argon cover gas for 1000 hours at 850 deg. C. Graphite was present in some of the crucibles with the goal of studying corrosion behavior of relevant reactor material combinations. In addition, a technique to reduce alloy corrosion through modification of the reduction-oxidation state was tested by the inclusion of zirconium to the system. Corrosion of 316L stainless steel was noted to occur primarily through surface depletion of chromium, an effect that was enhanced by the presence of graphite. Hastelloy{sup R} N experienced weight gain through electrochemical plating of corrosion products derived from the 316L stainless steel crucible. In the presence of zirconium, both alloys gained weight through platingmore » of zirconium and as a result formed intermetallic layers. (authors)« less