铝、铬元素对热轧态Incoloy 800H合金耐碳酸熔盐腐蚀行为研究

曹峻嘉, 余海存, 高云滕, 李海啸, 李亚峰, 许世鹏, 喇培清

doi:10.16577/j.issn.1001-1560.2024.0274

材料保护 >

2024 , Vol. 57 >Issue 12: 96 - 106

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0274

工艺篇

铝、铬元素对热轧态Incoloy 800H合金耐碳酸熔盐腐蚀行为研究

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1.兰州理工大学材料科学与工程学院2.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室3.忻州综合检验检测中心山西省博士创新站4.兰州兰石集团超合金新材料有限公司5.酒泉职业技术学院甘肃省太阳能发电系统重点实验室

喇培清(1971－)，博士，教授，主要研究方向为耐高温合金材料； E-mail: pqla＠lut.edu.cn

收稿日期: 2024-04-19

修回日期: 2024-05-25

录用日期: 2024-05-30

网络出版日期: 2025-01-14

基金资助

甘肃省高校青年博士支持资助项目(2024QB-024)；甘肃省级科技计划资助(技术创新引导计划)项目(24CXGA061)；甘肃省科技重大专项资助项目(22ZD6GA008)；甘肃省高等学校产业支撑计划资助项目(GCJ2022-38)；甘肃省科技重大专项(23ZDGA010)；甘肃省太阳能发电系统重点实验室开放基金资助(2024SPKL04)

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Study on the Effects of Aluminum and Chromium on the Corrosion Resistance of Hot-Rolled Incoloy 800H Alloy in Molten Carbonate Salts

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(1.School of Materials Science and Engineering， Lanzhou University of Technology， Lanzhou 730050， China；2.State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals， Lanzhou University of Technology， Lanzhou 730050， China；3.Shanxi Province Doctoral Innovation Station， Xinzhou Comprehensive Inspection and Testing Center， Xinzhou 034000， China；4.Lanzhou Lanshi Group Superalloy New Materials Co.， Ltd.， Lanzhou 730050， China；5.Key Laboratory of Solar Power System， Gansu Province， Jiuquan Vocational and Technical College， Jiuquan 735000， China)

LA Peiqing (1972－)， Ph.D.， Research Focus: High Temperature Resistant Alloy Materials， E-mail: pqla＠lut.edu.cn

Received date: 2024-04-19

Revised date: 2024-05-25

Accepted date: 2024-05-30

Online published: 2025-01-14

Supported by

Funding of Youth Doctoral Support for Universities in Gansu Province(2024QB-024)；Gansu Provincial Science and Technology Plan Funding (Technology Innovation Guidance Program) Project(24CXGA061)；Gansu Province Science and Technology Major Special Funding Project(22ZD6GA008)； Gansu Province Higher Education Industry Support Program Funding Project(GCJ2022-38)；Funding of Major Science and Technology Projects in Gansu Province(23ZDGA010)；Foundation of Key Laboratory of Solar Power System (Grant No.2024SPKL04)

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摘要

金属合金在聚光太阳能热发电系统中会受到熔盐腐蚀，导致其寿命缩短。为了延长Incoloy 800H 合金在碳酸熔盐腐蚀中的使用寿命，采用真空感应炉熔炼制备了不同Al、Cr 含量的Incoloy 800H(800H)合金，通过XRD、SEM、TEM 等分析测试手段，探究Al、Cr 元素对800H 合金耐碳酸熔盐腐蚀的作用机制。结果表明:在650 ℃的碳酸熔盐[32.1%(质量分数，下同)Li2CO3＋33.4%Na2CO3＋34.5%K2CO3]中浸泡240 h 后，Al 含量为3%的800H合金的腐蚀速率为1 071.00 μm/a，当铬含量为2.75%时的800H 合金的腐蚀速率为359.56 μm/a，腐蚀产物主要为LiFeO2和NiO。这是由于随着Al 含量的增加，试验钢基体表面形成的Al 的氧化物钝化膜更厚更致密，从而起到良好的保护作用。 Cr 含量的降低会减少可溶性Cr 氧化物的生成，使其他保护性氧化层生成的含量增加，减少基体中Fe 元素的析出，从而提高了合金的耐腐蚀性能。

关键词： Incoloy 800H 合金; 热轧; 碳酸熔盐腐蚀; 铝元素; 铬含量

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曹峻嘉, 余海存, 高云滕, 李海啸, 李亚峰, 许世鹏, 喇培清 . 铝、铬元素对热轧态Incoloy 800H合金耐碳酸熔盐腐蚀行为研究[J]. 材料保护, 2024 , 57(12) : 96 -106 . DOI: 10.16577/j.issn.1001-1560.2024.0274

Abstract

Metal alloys are subjected to molten salt corrosion in concentrating solar thermal power systems， leading to a reduction in their lifetime.In order to extend the service life of Incoloy 800H alloy in molten carbonate salt corrosion， Incoloy 800H alloys with varying aluminum(Al) and chromium (Cr) contents were prepared by vacuum induction melting.The corrosion mechanisms of Al and Cr elements on the resistance of 800H alloy to molten carbonate salt corrosion were investigated through analysis and testing methods such as X-ray diffraction (XRD)，scanning electron microscopy (SEM) and transmission electron microscopy (TEM).Results showed that the corrosion rate of Incoloy 800H alloy with 3%(mass fraction， the same below) Al content was 1 071.00 μm/a， while that with 2.75%Cr content was 359.56 μm/a after immersion in carbonate molten salt (32.1%Li2CO3＋33.4%Na2CO3＋34.5%K2CO3) at 650 ℃for 240 h.The corrosion products were mainly LiFeO2 and NiO.This was attributed to the fact that as the Al content increased， the oxide passivation film formed on the surface of the alloy became thicker and denser， providing better protection.The reduction of Cr content led to a decrease in the generation of soluble Cr oxides， an increase in the formation of other protective oxides， and a reduction in the precipitation of Fe elements in the substrate， thus improving the alloy’s corrosion resistance.

Key words： Incoloy 800H alloys; hot rolling treatment; carbonated molten salt corrosion; aluminum element; chromium content

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