【摘要】：作為第四代反應堆堆型之一的釷基熔鹽堆(TMSR,thorium molten salt reactor)具有固有安全性和防止核擴散等特點,由于使用熔鹽做冷卻劑和慢化劑,熔鹽堆結構材料要具備高溫下與氟鹽良好的相容性,因此對材料性能也有更加苛刻的要求。目前作為TMSR結構材料的鎳基合金對抗氟鹽腐蝕的效果不明顯,因此本研究采用了表面涂層技術在鎳基合金表面獲得一層防護層,以提高材料的耐氟鹽腐蝕能力。通過電化學方法在鎳基合金基體上沉積得到一層純鎳防護層,采用掃描電子顯微鏡(SEM)和背散射電子衍射(EBSD)等分析測試手段,研究了鍍液體系、電沉積時間等對涂層性能的影響。研究發(fā)現(xiàn),在氨基磺酸鎳鍍液體系中得到的涂層性能優(yōu)于瓦特液體系,涂層厚度隨沉積時間延長不斷增大。同時對涂層的耐腐蝕性能進行了研究,研究結果表明涂層在700℃氟鹽中400 h后未發(fā)生明顯的腐蝕,因此利用表面涂層技術能夠提高TMSR結構材料的耐氟鹽腐蝕性能。
[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，

本文編號：2480904