Study on the High-Temperature Corrosion Behavior of Laser Cladding Coatings in Biomass Power Plant Environments

YANG Erjuan, YANG Lan, WANG Caixia, WANG Yansong, LI Yong, LIU Fuguang, LIU Gang

doi:10.16577/j.issn.1001-1560.2024.0239

Materials Protection >

2024 , Vol. 57 >Issue 10: 182 - 189

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0239

Study on the High-Temperature Corrosion Behavior of Laser Cladding Coatings in Biomass Power Plant Environments

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(1.Xi’an Thermal Power Research Institute Co.， Ltd.， Xi’an 710054， China；2.Xi’an Yitong Thermal Technical Service Co.， Ltd.， Xi’an 710032， China)

YANG Erjuan(1983-)，Ph.D.， Senior Engineer， Research Focus: Welding Repair and Surface Protection Technology for Key Components of Power Station，E-mail:yangerjuan＠tpri.com.cn

Received date: 2024-02-27

Revised date: 2024-03-27

Accepted date: 2024-03-28

Online published: 2024-12-22

Supported by

Science and Technology Project of China Huaneng Group Co.，Ltd.(HNKJ21-H77)；Key Research and Development Program of Shaanxi Province (2023-YBGY-360)

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Abstract

Compared to fuels such as coal and natural gas， biomass has a lower heating value and contains a greater variety and higher concentration of corrosive media.The combustion of biomass produces a significant amount of corrosive atmospheres containing chlorine and sulfur， as well as metallic molten salts， which leads to severe high-temperature corrosion issues on the heating surfaces of biomass waste heat boilers.Although the existing technology of overlaying nickel-based corrosion-resistant alloys on the surface of pipes can significantly enhance the service life of pipelines， it suffers from numerous drawbacks， including low operational efficiency， unsuitability for on-site construction， and thermal deformation of the pipes.Inconel 625 high-temperature corrosion-resistant coatings were prepared on the surface of TP347H heat-resistant steel using two processes: conventional laser cladding and high-speed laser cladding.A comparative study was conducted on the long-term high-temperature corrosion characteristics of TP347H heat-resistant steel before and after cladding with Inconel 625 alloy.The microstructure of the coatings was characterized using scanning electron microscopy (SEM) after preparation and after 500 hours of high-temperature chloride corrosion.The corrosion resistance of TP347H heat-resistant steel was quantitatively evaluated using the weight gain method before and after coating.Results showed that under optimized process parameters， the coatings produced by both conventional and high-speed laser cladding exhibited dense microstructures， with bond strengths of 362.4 MPa and 217.3 MPa， respectively， and dilution rates of 5.4%and 0.9%.The weight gain results from corrosion tests showed that，under simulated corrosion conditions at 550 ℃，the corrosion rates of the Inconel 625 alloy coatings from laser cladding and high-speed laser cladding were approximately 17% and 8% of that of the TP347H heat-resistant steel substrate， respectively.Under simulated corrosion conditions at 650℃， the corrosion rates of the coatings were approximately 11%and 7%of that of the TP347H heat-resistant steel substrate， respectively.

Key words： biomass power station; high temperature corrosion; high speed laser cladding; laser cladding; inconel 625 coating

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YANG Erjuan, YANG Lan, WANG Caixia, WANG Yansong, LI Yong, LIU Fuguang, LIU Gang . Study on the High-Temperature Corrosion Behavior of Laser Cladding Coatings in Biomass Power Plant Environments[J]. Materials Protection, 2024 , 57(10) : 182 -189 . DOI: 10.16577/j.issn.1001-1560.2024.0239

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