镍基合金耐氟盐腐蚀防护涂层的性能研究
发布时间：2019-05-19 17:13
【摘要】：作为第四代反应堆堆型之一的钍基熔盐堆(TMSR,thorium molten salt reactor)具有固有安全性和防止核扩散等特点,由于使用熔盐做冷却剂和慢化剂,熔盐堆结构材料要具备高温下与氟盐良好的相容性,因此对材料性能也有更加苛刻的要求。目前作为TMSR结构材料的镍基合金对抗氟盐腐蚀的效果不明显,因此本研究采用了表面涂层技术在镍基合金表面获得一层防护层,以提高材料的耐氟盐腐蚀能力。通过电化学方法在镍基合金基体上沉积得到一层纯镍防护层,采用扫描电子显微镜(SEM)和背散射电子衍射(EBSD)等分析测试手段,研究了镀液体系、电沉积时间等对涂层性能的影响。研究发现,在氨基磺酸镍镀液体系中得到的涂层性能优于瓦特液体系,涂层厚度随沉积时间延长不断增大。同时对涂层的耐腐蚀性能进行了研究,研究结果表明涂层在700℃氟盐中400 h后未发生明显的腐蚀,因此利用表面涂层技术能够提高TMSR结构材料的耐氟盐腐蚀性能。
[Abstract]:As one of the fourth generation reactor types, thorium based molten salt reactor (TMSR,thorium molten salt reactor) has the characteristics of inherent safety and preventing nuclear proliferation, because of the use of molten salt as coolant and moderator. The molten salt reactor structure material should have good compatibility with fluorine salt at high temperature, so it also has more stringent requirements for the properties of the material. At present, the effect of nickel-based alloy as TMSR structural material against fluorine corrosion is not obvious, so the surface coating technology is used to obtain a protective layer on the surface of nickel-based alloy in order to improve the corrosion resistance of fluorine salt. A pure nickel protective layer was deposited on nickel base alloy substrate by electrochemical method. The bath system was studied by scanning electron microscope (SEM) and backscattering electron diffraction (EBSD). The effect of electrodeposition time on the properties of the coating. It is found that the coating performance in nickel aminosulfonic acid plating solution system is better than that in Watt solution system, and the coating thickness increases with the prolongation of deposition time. At the same time, the corrosion resistance of the coating was studied. The results show that the corrosion resistance of the coating does not occur after 400 h in fluorine salt at 700 鈩，
本文编号：2480904
[Abstract]:As one of the fourth generation reactor types, thorium based molten salt reactor (TMSR,thorium molten salt reactor) has the characteristics of inherent safety and preventing nuclear proliferation, because of the use of molten salt as coolant and moderator. The molten salt reactor structure material should have good compatibility with fluorine salt at high temperature, so it also has more stringent requirements for the properties of the material. At present, the effect of nickel-based alloy as TMSR structural material against fluorine corrosion is not obvious, so the surface coating technology is used to obtain a protective layer on the surface of nickel-based alloy in order to improve the corrosion resistance of fluorine salt. A pure nickel protective layer was deposited on nickel base alloy substrate by electrochemical method. The bath system was studied by scanning electron microscope (SEM) and backscattering electron diffraction (EBSD). The effect of electrodeposition time on the properties of the coating. It is found that the coating performance in nickel aminosulfonic acid plating solution system is better than that in Watt solution system, and the coating thickness increases with the prolongation of deposition time. At the same time, the corrosion resistance of the coating was studied. The results show that the corrosion resistance of the coating does not occur after 400 h in fluorine salt at 700 鈩，
本文编号：2480904
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