Unexpected accelerated corrosion of Cr in Ni-xW-6Cr alloy with W content increasing

• DOI: 10.1016/j.corsci.2021.109761
• Publication Date: 2021-08-12T14:51:05Z
• Authors: Shulin Liu; Xiang-Xi Ye; Shuai Yan; Xiaodong Wang; Bin Leng; Xingtai Zhou
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The influence of W content upon corrosion of Ni-xW-6Cr alloys in molten FLiNaK salts at 850 °C was examined. The results indicate a significantly greater depletion of Cr and W from Ni-xW-6Cr alloys with higher W contents in the molten FLiNaK salt, which mainly results from the increasing activities of W and Cr in the alloy with the W content increasing. The high concentrations of oxygen, Ni and Fe impurities further accelerate the corrosion of W and Cr from the alloy by providing more corrosion vacancies as diffusion paths in the alloy's near surface area.