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金属学报  2003 

不锈钢及镍基合金在亚临界水环境中的腐蚀

, PP. 649-654

Keywords: 超临界水氧化,不锈钢,镍基合金

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Abstract:

研究了两种不锈钢和两种镍基合金在模拟超临界水法快速降解废旧塑料制品环境中的耐腐蚀性,采用SEM观察表面腐蚀形貌.实验结果表明,4种材料在320℃去离子纯水和0.1mol/L的NaCl介质溶液中,经过96h暴露实验,均匀腐蚀增重率由高到底的顺序均分别为304L,AL6XN,Inconel718,Alloy671.Cl-离子的出现显著加剧304L和AL6XN的均匀腐蚀,且导致轻微点蚀;对两种镍基合金的均匀腐蚀影响较轻,但导致Inconel718发生明显点蚀,而Alloy671材料表现出良好的耐蚀性,用EDXS和XPS分析,发现Inconel718发生严重的Ni选择性溶解腐蚀,Alloy671表面的Cr2O3对材料起到了良好的保护作用.Alloy671可用作高压釜反应器的制造材料.

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