2的熔融氯化鹽對金屬傳熱管道和儲(chǔ)熱容器腐蝕后在其表面形成MgO，MgO對管道耐腐蝕性能影響尚不清楚。通過對比碳鋼和3種Fe-Cr-Ni合金在固態(tài)（345 ℃）和熔融NaCl-MgCl2（445和545 ℃）中的腐蝕行為，分析了MgO對4種試樣在不同溫度下的腐蝕行為機(jī)理。結(jié)果表明，在固態(tài)NaCl-MgCl2中，碳鋼表面MgO殼致密且連續(xù)，可以保護(hù)試樣免受腐蝕。在熔融NaCl-MgCl2中，4種試樣表面也生成了致密的MgO殼，但它因熱應(yīng)力作用而開裂和剝落，熔融鹽沿著氧化膜裂紋滲入MgO/基體界面，發(fā)生化學(xué)-電化學(xué)聯(lián)合腐蝕反應(yīng)，不能保護(hù)試樣免受該熔鹽腐蝕。;Molten chloride salt is a candidate heat transfer medium (HTM) for the next generation high temperature concentrating solar power (CSP). A corrosion product MgO will be formed on metal surface in the molten chloride containing MgCl2. Based on the corrosion behavior comparison of a carbon steel and three kinds of Fe-Cr-Ni alloys in solid (345 °C) and molten state NaCl-MgCl2 (445 and 545 °C), the effects of MgO on corrosion resistance of the four kinds of samples were discussed. Results show that in solid eutectic NaCl-MgCl2 at 345 °C, the MgO layer is dense and complete on the carbon steel surface, which can protect the specimen from corrosion. In the molten salt, a dense MgO layer is also formed on the four kinds of sample surface, but the molten salt penetrates the MgO/matrix interface along cracks of the oxide layer due to the peeling off of MgO layer under thermal stress, which cannot protect specimen from corrosion. The corrosion mechanism is the chemical-electrochemistry reactions."/>