Abstract The corrosion behaviours of Fe-Cr-Al alloy in four types of molten eutectic salts-chlorinated salt, carbonate salt, mixture of carbonate salt and MgO and nitrate salt-have been investigated in this paper. The experimental temperatures were chosen to be near the melting points of various eutectic salts and the longest holding time was sustained to 30 days in the isothermal experiments. The microstructures of the samples before and after corrosion tests were detected by X-ray diffraction and scanning electron microscope techniques. The research indicates, among the three eutectic salts, the corrosion of Fe-Cr-Al alloys in the molten chlorinated eutectic salt is the strongest with the thickness of corrosion scales between 40 and 180 μm. The corrosion in molten carbonate eutectic salt is relatively moderate, and the corrosive thickness is between 2 and 8 μm. For the molten nitrate eutectic salt, no obvious corrosion with special morphology was observed. The corrosion strength of the four eutectic salts should be in the order of chlorine eutectic salt > (carbonate eutectic salt + MgO) > carbonate eutectic salt > nitrate eutectic salt.

中文翻译：

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铁铬铝钢在各种共晶盐熔点附近的腐蚀行为

摘要 本文研究了Fe-Cr-Al合金在氯化盐、碳酸盐、碳酸盐与MgO和硝酸盐的混合物四种熔融共晶盐中的腐蚀行为。选择实验温度接近各种共晶盐的熔点，并且在等温实验中最长保持时间持续到 30 天。通过X射线衍射和扫描电子显微镜技术检测腐蚀试验前后试样的显微组织。研究表明，在三种共晶盐中，Fe-Cr-Al合金在熔融氯化共晶盐中的腐蚀最强，腐蚀鳞片厚度在40～180μm之间。在熔融碳酸盐共晶盐中的腐蚀相对温和，腐蚀厚度在2-8μm之间。对于熔融硝酸盐共晶盐，没有观察到明显的具有特殊形貌的腐蚀。四种共晶盐的腐蚀强度应为氯共晶盐>（碳酸盐共晶盐+MgO）>碳酸盐共晶盐>硝酸盐共晶盐。