熔鹽反應器(MSR)是第四代核反應器的一種，利用氟化鹽的高溫融熔態作為一次迴路的冷卻劑。因為操作溫度高於傳統的沸水式(BWR)和壓水式(PWR)反應器，因此用於熔鹽反應器中的結構材料勢必將面臨由高操作溫度和氟化融熔鹽的強腐蝕性所帶來的挑戰。
為了調查合金在熔鹽中的腐蝕機制，並分析其作為熔鹽反應器中結構材料的適用性，我們挑選Hastelloy-N和Hastelloy-B3此兩種鎳基超合金放入氟化融熔鹽中進行高溫腐蝕實驗，本實驗用的氟化鹽為氟化鋰、氟化鈉和氟化鉀構成的三元共晶鹽，FLiNaK(LiF-NaF-KF:46.5-11.5-42%)。
腐蝕實驗在625合金作成的壓力鍋中進行，壓力為常壓，並通以氬氣使得實驗環境為惰性環境。之後分別在700°C利用含水量3.19wt%的熔鹽進行100、200、500和1000小時的靜態腐蝕以及含水量1.91wt%的熔鹽中進行100和200小時的靜態腐蝕實驗。
實驗顯示試片之腐蝕質量損失在後期會漸趨平緩跟試片表面成分分布有關，意即實驗後期在試片表面能夠被腐蝕之元素已逐漸減少。腐蝕速率會被固體擴散機制所影響，熔鹽含水量與腐蝕質量損失有正相關的關係。低含水量的熔鹽腐蝕試片其晶界腐蝕寬度較窄，pitting也相對較小。腐蝕型態一開始是沿著晶界以及twin boundary的沿晶腐蝕，但會逐漸偏向均勻腐蝕。本實驗觀察到在Hastelloy-B3中Mo會被熔鹽腐蝕，而在Hastelloy-N中Cr會被熔鹽腐蝕，用於此種環境的Hastelloy-N以及Hastelloy-B3在後期會因為合金表面不再fresh而使得腐蝕量減少，若再佐以更精密的除水技術以及更低的熔鹽含水量，則可望用於未來熔鹽式反應器之結構材料。

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