针对Inconel 600和Inconel 690合金在高温高压水环境中生成的腐蚀氧化膜,提出了扩散路径分析模型,阐明了氧化膜微观结构及其形成机理.基于氧化膜成分、合金成分、以及环境因素,构建了Inconel 600及Inconel 690合金的Ni-Cr-H2O三元相图.Inconel 600合金高温高压水腐蚀的扩散路径表明,其氧化膜由内层Cr2O3与外层FeCr2O4尖晶石构成.通过Inconel 690合金高温高压水腐蚀的扩散路径分析可知,氧化膜由单一的Cr2O3构成.扩散路径分析结果表明,在Inconel 600氧化膜中,O2-比Cr3+具有更高的扩散速率,而在Inconel 690氧化膜中,O2一的迁移率较低,所受阻力较大,从而使得Inconel600和Inconel 690合金氧化膜呈现出不同的微观结构.
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