首页|原位自生MgO对氯化物熔盐腐蚀性的影响

原位自生MgO对氯化物熔盐腐蚀性的影响

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熔融氯化物盐是优异的传热流体和热能储存介质,在太阳能发电领域具有广泛的应用价值.但在实际工作环境下,熔融氯化物盐对金属管道(Inconel 625合金)有较强的腐蚀性,Inconel 625焊丝通常作为修补材料在太阳能管道修补上使用.为了解决熔融氯化物盐对Inconel 625熔敷金属的强腐蚀性问题,采用MAG焊堆焊出Inconel 625熔敷金属,探究在KCl-MgCl2熔盐中加入纳米级MgO颗粒与MgCl2·6H2O原位自生MgO对KCl-MgCl2盐腐蚀性的影响.结果表明:Inconel 625熔敷金属在KCl-MgCl2、KCl-MgCl2+5%MgO和KC1-MgCl2+5%MgCl2·6H2O(质量分数)中经过72h的腐蚀后,试样的质量损失分别为0.00714、0.00512和0.00308 g·cm-2.Inconel 625熔敷金属在原位自生MgO熔盐中的腐蚀速率同比降低56.86%和39.85%.熔盐中加入纳米MgO颗粒虽然能够缓解氯化物熔盐的腐蚀性,但熔盐发生团聚或沉降现象,导致MgO和MgCr2O4保护壳层分布不均匀;在熔盐中添加MgCl2·6H2O使其原位生成MgO,生成的MgO和MgCr2O4保护壳层更加均匀,能够阻碍腐蚀性介质侵蚀,是降低氯化物熔盐腐蚀性的有效方法.
Effect of In-situ Self-Generated MgO on Corrosion Resistance of KCl-MgCl2 Molten Salt
Molten chloride salt is excellent candidature for third-generation solar energy storage media due to its good energy storage advantages and low price.However,in the actual working environment,molten chloride salt has strong corrosion to metal pipes(Inconel 625 alloy).Inconel 625 welding wire is usually used as a repair material for solar pipeline.In order to solve the problem of strong corrosion of molten chloride salt to Inconel 625 cladding metal,Inconel 625 cladding metal was welded by MAG welding,and the effect of nano-MgO particles and MgCl2·6H2O in-situ self-generated MgO on the corrosion of KCl-MgCl2 molten salt was investigated.The results show that after 72 h of corrosion in KCl-MgCl2,KCl-MgCl2+5wt% MgO and KCl-MgCl2+5wt%MgCl2·6H2O,the mass loss of Inconel 625 cladding metal is 0.00714,0.00512,and 0.00308 g·cm-2,respectively.The corrosion rate of Inconel 625 cladding metal in molten salt with in-situ self-generated MgO is decreased by 56.86%and 39.85%.Although the addition of nano-MgO particles in the molten salt can alleviate the corrosion of the chloride molten salt,the molten salt is agglomerated or settled,leading to a non-uniform distribution of MgO and MgCr2O4 protective shell layers.Adding MgCl2.6H2O to the molten salt can generate in-situ MgO,and the generated MgO and MgCr2O4 protective shells are more uniform,which hinder the erosion of corrosive media,so it is an effective method to reduce the corrosion of chloride molten salt.

Inconel 625 cladding metalchloride molten saltin-situ self-generated MgOcorrosion inhibition

杨太森、张桂清、戴志勇、梁学伟、王英第、苏允海

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沈阳工业大学材料科学与工程学院,辽宁沈阳 110870

Inconel 625熔敷金属 氯化物熔盐 原位自生MgO 缓蚀

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(5)
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