LI Ji,ZHAN Yingjie,TANG Liying,et al.Surface property of Incoloy 800H alloy in alkaline high-temperature and high-pressure water[J].Thermal Power Generation,2023,52(01):98-104.[doi:10.19666/j.rlfd.202205092]
Incoloy 800H合金在碱性高温高压水中的表面特性研究
- Title:
- Surface property of Incoloy 800H alloy in alkaline high-temperature and high-pressure water
- 关键词:
- Incoloy 800H合金; 高温气冷堆; 表面特性; 碱性高温高压水
- 摘要:
- 对675 ℃时效0~10 000 h的Incoloy 800H合金（800H合金）在300 ℃/10 MPa的碱性高温高压水化学环境中的腐蚀电化学行为和氧化膜显微特征进行了系统研究。通过腐蚀电化学测试、长期浸泡、扫描电镜/透射电镜观察、拉曼光谱/快速傅里叶变化分析等方法，掌握了800H合金腐蚀电化学行为、表面膜形态成分特征随时效时间的变化规律。研究结果表明：时效处理可使800H合金传热管在高温高压水中的开路电位和自腐蚀电位Ecorr小幅升高，但时效时间延长对电化学行为影响不显著；800H合金在高温高压水中呈现钝化过钝化转变，生成的氧化膜呈多层结构，最外层为弥散分布的大颗粒氧化物，组成为Fe2O3或NiFe2O4；中间层为较为致密的小尺寸氧化物，多为NiFe2O4或FeCr2O4；内层则是致密且连续的氧化物，为含Cr和少量Fe的非晶或纳米晶氧化物。800H合金在300 ℃/10 MPa的碱性高温高压水中具有较好的抗腐蚀性和表面稳定性。
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（责任编辑 邓玲惠）
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备注/Memo
李季（1985），女，博士，高级工程师，主要研究方向为火电、核电用金属材料性能，liji@tpri.com.cn。
