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The effect of the microstructure on the corrosion behavior of N5 superalloy in a molten (Li,Na,K)F eutectic salt

机译：微观结构对熔融（Li，Na，K）F共晶盐中N5超合金腐蚀行为的影响

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摘要

The corrosion of structural materials in molten fluorides, influenced by the microstructure of the structural materials, is considered to be a great challenge for the development of molten salt reactors using fluorides as fuel carriers or coolants. In this paper, the corrosion behavior of the monocrystal and polycrystal N5 superalloy in molten (Li,Na,K)F eutectic salt at 700 degrees C is investigated. The results indicate that the mass loss of the polycrystal is much higher than that of the monocrystal after immersion in molten (Li,Na,K)F for 100 h. The corrosion of the monocrystal and the polycrystal N5 superalloys occurs mainly through the preferential dissolution of Cr and Al, which leads to an Al/Cr-depleted layer and some internal voids. Furthermore, the corrosion rate of the polycrystal N5 superalloy is obviously accelerated by the existence of grain boundaries, which results in a mass loss of about 16.995 mg cm(-2) and a Al/Cr-depleted layer of around 175 mu m, compared to 11.373 mg cm(-2) and 125 mu m, respectively, for the monocrystal N5 superalloy.
机译：受熔融氟化氟的结构材料的腐蚀，受到结构材料的微观结构的影响，被认为是使用氟化物作为燃料载体或冷却剂的熔融盐反应器发育的巨大挑战。本文研究了700℃下熔融（Li，Na，K）F共晶盐中的单晶和多晶N5超合金的腐蚀行为。结果表明，多晶体的质量损失远高于熔融（Li，Na，K）F的熔融（Li，Na，K）F溶液100小时后的单晶。单晶体和多晶N5高温合金的腐蚀主要通过Cr和Al的优先溶解，这导致Al / Cr耗尽层和一些内部空隙。此外，通过存在晶界的存在明显加速了多晶N5高温合金的腐蚀速率，这导致大约16.995mg cm（-2）的质量损失和约175亩的Al / Cr耗尽层。比较对于单晶N5高温合金，分别为11.373mg cm（-2）和125μm。

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  • 来源
    《RSC Advances》 |2015年第41期|共6页
  • 作者

    Wang Yan Li; Wang Qian; Liu Hui Jun; Zeng Chao Liu;

  • 作者单位

    Chinese Acad Sci Inst Met Res Lab Corros &

    Protect Shenyang 110016 Peoples R China;

    Chinese Acad Sci Inst Met Res Lab Corros &

    Protect Shenyang 110016 Peoples R China;

    Chinese Acad Sci Inst Met Res Lab Corros &

    Protect Shenyang 110016 Peoples R China;

    Chinese Acad Sci Inst Met Res Lab Corros &

    Protect Shenyang 110016 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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