在 NiCrAl 涂层中添加硅对熔融硝酸盐腐蚀的影响

IF 2.6 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals Pub Date : 2024-08-08 DOI:10.3390/met14080902
Thamrongsin Siripongsakul, Patchaporn Kettrakul, Noparat Kanjanaprayut, Piyorose Promdirek
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引用次数: 0

摘要

聚光太阳能发电(CSP)系统中使用的材料因其储能效率高而备受关注。在 CSP 系统中,熔盐既可用作储热介质,也可用作传热液体。在熔盐中,容器和管道中使用的钢合金极易受到热腐蚀。为了保护钢合金,使用涂层是延长合金寿命的绝佳策略。NiCrAl 涂层非常适合高温环境。本研究的目的是调查 AISI304 镍铬铝加硅涂层在熔盐中的腐蚀行为。使用高速氧气燃料(HVOF)技术沉积了添加和未添加 Si 的 NiCrAl 涂层。腐蚀试验是在 400-600 °C、含 0.5% NaCl 的改良太阳盐中进行的。重量法评估了浸泡试验的重量变化。在 400 °C 时,由于氧化反应和熔盐渗透,重量增加了。在 600 ℃ 时,腐蚀反应占主导地位,表观氧化作用减弱;但检测到了氧化产物氧化镍和硅酸铝钠。添加硅有助于形成保护性氧化物硅酸铝钠,从而抑制熔盐氧化反应和熔盐渗透。
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Effect of Si Addition in NiCrAl Coating on Corrosion in Molten Nitrate Salt
The materials used in concentrating solar power (CSP) systems are becoming of interest because of the high energy efficiency of energy storage. Molten salts can be used as both heat-storage media and heat-transfer fluid in a CSP system. In molten salts, steel alloys used in vessels and pipelines are highly vulnerable to hot corrosion. To protect steel alloys, applying a coating is an excellent strategy to extend the life of the alloy. NiCrAl coatings are well-suited for high-temperature environments. The purpose of this study was to investigate the corrosion behavior of NiCrAl with Si addition coatings on AISI304 in molten salt. NiCrAl coatings with and without Si addition were deposited using the high-velocity oxygen fuel (HVOF) technique. The corrosion test was performed using an immersion test in modified solar salt with 0.5% NaCl at 400–600 °C. Gravimetric methods evaluate the weight change for immersion tests. At 400 °C, an increased amount of weight gain due to the oxidation reaction and molten salt infiltration was observed. At 600 °C, the corrosion reaction was more dominant, and apparent oxidation was decreased; however, oxidation products NiO and sodium aluminum silicate were detected. Si addition supports the formation of the protective oxide sodium aluminum silicate, which inhibits molten salt oxidation reaction and molten salt infiltration.
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来源期刊
Metals
Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING
CiteScore
4.90
自引率
13.80%
发文量
1832
审稿时长
1.5 months
期刊介绍: Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.
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