Electrochemical study of the corrosion of a Ni-based alloy GH3535 in molten (Li,Na,K)F at 700 degrees C
Electrochemical study of the corrosion of a Ni-based alloy GH3535 in molten (Li,Na,K)F at 700 degrees C
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镍基合金GH3535在700℃熔融(Li,Na,K)F中腐蚀的电化学研究
DOI：
10.1016/j.jfluchem.2015.06.014
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发表时间：
2015-10
影响因子：
1.9
通讯作者：
Zeng, Chaoliu
中科院分区：
文献类型：
--
作者：
Liu, Huijun;Yu, Guojun;Hou, Juan;Zeng, Chaoliu
结构材料与熔融氟化物盐的相容性是高温熔盐堆应用和发展面临的一个紧迫挑战。本文采用电化学方法研究了GH 3535合金在700 °C共晶（Li，Na，K）F熔体中的腐蚀行为。此外，添加剂CrF 3与浓度为0.09和0.18 M的合金在熔体中的腐蚀的效果也进行了研究，试图了解涉及多价过渡金属Cr离子Cr 2 +/Cr 3+的腐蚀机理。结果表明，在腐蚀电位下，合金处于主动溶解状态，其腐蚀主要是通过基体中Cr的优先溶解，产生贫Cr层和内部空洞。在Ar中引入5%H_2O明显加速了合金的腐蚀，导致形成更宽的贫Cr层，在内部空洞上形成富Cr的内部氧化物。CrF 3本身作为一种氧化剂，以加速铬的溶解，与更显着的效果观察到更高的CrF 3含量。
The compatibility of structural materials with molten fluoride salts is an immediate challenge for the application and development of molten salt reactor (MSR) operating at high temperatures. In the present presentation, the corrosion behavior of a nickel-based alloy GH3535 has been examined in an eutectic (Li,Na,K)F melt at 700 °C under Ar and Ar-5%H2O, respectively, by some electrochemical techniques. Moreover, the effect of the additive CrF3with concentrations of 0.09 and 0.18 M on the corrosion of the alloy in the melt has also been investigated in an attempt to understand the corrosion mechanism involving the multivalent transition metal Cr ions Cr2+/Cr3+. It is shown that the alloy is in active dissolution state at the corrosion potential and its corrosion occurs mainly through the preferential dissolution of Cr from the substrate, producing a Cr-depleted layer and some internal voids. The introduction of 5%H2O in Ar accelerates obviously the corrosion of the alloy, giving rise to the formation of a wider Cr-depleted layer where some Cr-rich internal oxides are formed over the internal voids. CrF3itself acts as an oxidizer to accelerate the dissolution of Cr, with a more significant effectiveness observed for a higher CrF3content.
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