| 三元混合氯化盐NaCl-KCl-MgCl2对合金的腐蚀特性实验研究 |
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| 作者姓名： | 赵峥峥 王遥 刘斌 魏高升 |
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| 作者单位： | 1. 百吉瑞(天津)新能源有限公司, 天津市 空港经济区 300300;2. 电站设备状态监测与控制教育部重点实验室(华北电力大学), 北京市 昌平区 102206 |
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| 基金项目： | 国家重点研发计划项目(2017YFB061804) |
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| 摘 要： | 熔盐是目前太阳能热电站中应用最广泛的储热蓄热材料。为满足太阳能热发电系统对于熔盐的储热需求，该文将304、316L、321、310S不锈钢置于550℃的三元混合氯化盐NaCl-KCl-MgCl2（7：1：2）体系中，开展混合熔盐的腐蚀特性实验研究，并探讨其中的腐蚀机理。研究结果表明，在三元混合氯化盐NaCl-KCl-MgCl2（7：1：2）体系中，310S表现出较好的耐腐蚀性能，304的耐腐蚀性较差。MoO3、NiO、TiO2氧化物的生成可提高316L、310S、321不锈钢的耐腐蚀性能；混合氯化盐在高温下生成的Cl2是不锈钢腐蚀的重要原因，外部空气中的O2和H2O会进入熔盐侧与合金发生反应，加剧腐蚀。
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| 关 键 词： | 太阳能 熔盐 氯化盐 腐蚀 不锈钢 |
| 收稿时间： | 2018-10-12 |
Experimental Study on Corrosion Characteristics of Ternary Mixed Chloride Salt NaCl-KCl-MgCl2 |
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| Authors: | Zhengzheng ZHAO Yao WANG Bin LIU Gaosheng WEI |
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| Affiliation: | 1. Bai Ji Rui(Tianjin) New Energy Co., Ltd., Konggang Economic Zone, Tianjin 300300, China;2. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education(North China Electric Power University), Changping District, Beijing 102206, China |
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| Abstract: | Molten salt is the most widely used heat storage material in solar thermal power stations currently. In order to meet the heat storage requirements of the solar thermal power generation system for molten salt, four stainless steels of 304, 316L, 321 and 310S were placed in the ternary mixed chlorinated salt NaCl-KCl-MgCl2(7:1:2) system at 550℃ to study corrosion characteristics and explore corrosion mechanisms. The research results indicate that 310S shows good corrosion resistance and 304 shows poor corrosion resistance in the NaCl-KCl-MgCl2 (7:1:2) system of ternary mixed chlorinated salts. The formation of MoO3, NiO and TiO2 oxides can improve the corrosion resistance of 316L, 310S and 321. The Cl2 produced by mixed chloride salts at high temperature is an important cause of corrosion of stainless steel, O2 and H2O in the outside air will infiltrate into the molten salt and react with the alloy to accelerate the corrosion. |
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| Keywords: | solar energy molten salt chloride corrosion stainless steel |
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