激光熔覆层在生物质电站环境下的高温腐蚀行为研究

杨二娟, 杨兰, 王彩侠, 王艳松, 李勇, 刘福广, 刘刚

doi:10.16577/j.issn.1001-1560.2024.0239

材料保护 >

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

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

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激光熔覆层在生物质电站环境下的高温腐蚀行为研究

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¹西安热工研究院有限公司； ²西安益通热工技术服务有限责任公司

杨二娟(1983-)，博士，高工，研究方向为电站关键部件焊接修复与表面防护技术，E-mail:yangerjuan＠tpri.com.cn

收稿日期: 2024-02-27

修回日期: 2024-03-27

录用日期: 2024-03-28

网络出版日期: 2024-12-22

基金资助

中国华能集团科技项目(HNKJ21-H77)；陕西省重点研发计划(2023-YBGY-360)

收起

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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摘要

与煤炭、天然气等燃料相比，生物质发热值低，含有更多种类且浓度更高的腐蚀性介质，燃烧后产生大量含氯、硫腐蚀气氛及其金属熔盐，导致生物质焚烧余热锅炉受热面高温腐蚀问题严重。现有在管材表面堆焊镍基耐腐蚀合金的技术尽管可显著提高管道服役寿命，但存在工作效率低、不适合现场施工、管道热变形等诸多问题。对此，采用常规激光熔覆、高速激光熔覆2 种工艺在TP347H 耐热钢表面制备了Inconel 625 耐高温腐蚀涂层，对比研究了TP347H 耐热钢熔覆Inconel 625 合金涂层前后的长期高温腐蚀特性。采用扫描电镜(SEM)表征了制备态和500 h 高温含氯腐蚀后的覆层显微组织；采用增重法定量评价了覆层前后TP347H 耐热钢的耐腐蚀性能。结果表明:优化工艺参数条件下常规激光熔覆、高速激光熔覆制备覆层组织致密，2 种覆层与基材结合强度分别为362.4 MPa 和217.3 MPa，覆层稀释率分别为5.4%和0.9%。腐蚀增重结果表明，550 ℃模拟腐蚀条件下，激光熔覆、高速激光熔覆Inconel 625 合金覆层的腐蚀速率分别约为TP347H 耐热钢基材的17%和8%。 650 ℃模拟腐蚀条件下，激光熔覆、高速激光熔覆Inconel 625 合金覆层的腐蚀速率分别约为TP347H 耐热钢基材的11%和7%。

关键词： 生物质电站; 高温腐蚀; 高速激光熔覆; 激光熔覆; Inconel 625 覆层

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杨二娟, 杨兰, 王彩侠, 王艳松, 李勇, 刘福广, 刘刚 . 激光熔覆层在生物质电站环境下的高温腐蚀行为研究[J]. 材料保护, 2024 , 57(10) : 182 -189 . DOI: 10.16577/j.issn.1001-1560.2024.0239

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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