Effects of Cr3+ on the corrosion of SiC in LiF–NaF–KF molten salt

• DOI: 10.1016/j.corsci.2016.10.026
• Publication Date: 2016-10-25T02:00:41Z
• Authors: Wandong Xue; Xinmei Yang; Jie Qiu; Huajian Liu; Bin Zhao; Huihao Xia; Xingtai Zhou; Ping Huai; Hongtao Liu; Jianqiang Wang
• Keywords: Carbon fibers

Abstract Effects of Cr3+ on the corrosion of SiC in LiF–NaF–KF molten salt were investigated. Results reveal that Cr3+ can drive the corrosion of SiC. Thickness of the corroded region induced by Cr3+ is greater than 12 μm for 400 h, while the corroded region induced by pure salt is ∼2.5 μm. Corrosion induced by Cr3+ should be attributed to the reactions of Cr3+ with SiC. Cr3+ reacts with SiC to form Cr3C2, Cr7C3, and graphitic carbon in the corroded region of SiC, which results in the dissolution of element Si from SiC into the salt.