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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。
Thorium-based molten salt reactor (TMSR), one of the fourth generation reactor models, is inherently safe and prevents nuclear proliferation. Due to the use of molten salt as a coolant and moderator, the structure of the molten salt reactor Materials to have good compatibility with fluoride salts at high temperatures, so the material properties also have more demanding requirements. At present, as the TMSR structural material, Ni-based alloy has little effect on the corrosion resistance of fluoride salt. Therefore, in this study, surface coating technology was used to obtain a protective layer on the surface of Ni-based alloy to improve the fluoride corrosion resistance of the material. Electro-chemical method was used to deposit a pure nickel protective layer on the nickel-base alloy substrate. The analytical methods such as scanning electron microscopy (SEM) and backscattered electron diffraction (EBSD) were used to study the effects of the plating solution system and electrodeposition time Effect of coating performance. The results showed that the coatings obtained in the nickel sulfamate bath system outperformed the watt liquid system and the coating thickness increased with deposition time. At the same time, the corrosion resistance of the coating was studied. The results show that the coating has no obvious corrosion after 400 h at 700 ℃. Therefore, the surface coating technology can improve the fluoride corrosion resistance of the TMSR structural material.