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王军伟,鲍泽龙,叶海花,马清,贾红光.碳钢和铁-铬-镍基合金合在相变储能材料熔融共晶氯化钠和氯化镁中腐蚀行为研究[J].稀有金属材料与工程(英文),2020,49(2):412~421.[wangjunwei,baozelong,yehaihua,maqing and jiahongguang.Corrosion Behavior of a Carbon Steel and Iron-Chromium-Nickel Alloys in Molten Eutectic Sodium Chloride and Magnesium Chloride as Phase Change Material[J].Rare Metal Materials and Engineering,2020,49(2):412~421.]
Corrosion Behavior of a Carbon Steel and Iron-Chromium-Nickel Alloys in Molten Eutectic Sodium Chloride and Magnesium Chloride as Phase Change Material
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Received:June 19, 2019  Revised:July 08, 2019
DOI:
Key words: molten chloride salt  high temperature corrosion  magnesium oxide  stainless steel  carbon steel
Foundation item:国家自然科学基金项目;青海省自然科学基金项目
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wangjunwei,baozelong,yehaihua,maqing and jiahongguang  
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Abstract:
      As a phase change material for solar energy storage at moderate- high temperature, the molten eutectic chloride salt of a sodium chloride and a magnesium chloride (NaCl-52 wt% MgCl2) is strongly corrosive to metal container and pipes. The corrosion behavior of three kinds of iron-chromium-nickel (Fe-Cr-Ni) alloys and a carbon steel in the molten eutectic salt at 520℃ were studied. Results show that the carbon steel is corroded along grain boundary for a iron atom become ferrous ion (Fe2+) and ferric ion (Fe3+). A thick and compact magnesium oxide (MgO) shell is formed on the carbon steel surface, which protects the specimen from corrosion. The MgO shell also formed on the three kinds of iron-chromium-nickel alloy surface, but the magnesium oxide shell can’t protect them from corrosion in the molten salt. Because a loose skeletal microstructure rich Ni is formed on specimen surface for the chromium element is preferentially corroded. The magnesium oxide (MgO) shell or particles peel off easily. In addition, the higher of the content of the chromium, the more serious of the corrosion As a vessel or pipe material for solar energy storage by molten chloride salt, a cheap iron-based alloy with alloy element nickel is more development prospects.