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

CAO Junjia, YU Haicun, GAO Yunteng, LI Haixiao, LI Yafeng, XU Shipeng, LA Peiqing

doi:10.16577/j.issn.1001-1560.2024.0274

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

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

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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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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CAO Junjia, YU Haicun, GAO Yunteng, LI Haixiao, LI Yafeng, XU Shipeng, LA Peiqing . Study on the Effects of Aluminum and Chromium on the Corrosion Resistance of Hot-Rolled Incoloy 800H Alloy in Molten Carbonate Salts[J]. Materials Protection, 2024 , 57(12) : 96 -106 . DOI: 10.16577/j.issn.1001-1560.2024.0274

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