预氧化对铝硅涂层耐热腐蚀性能的影响

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materiali in tehnologije Pub Date : 2023-01-25 DOI:10.17222/mit.2022.645

Haishuang Lv, Yanmei Li, Ya-Bing Li, Naiwen Fan

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引用次数: 0

摘要

在本研究中，研究了预氧化对Al-Si涂层在Na2SO4和25w /% NaCl混合物中900℃热腐蚀行为的影响。结果表明:经腐蚀120 h后，预氧化铝硅涂层中有大量β-NiAl残留，未发现明显的硫化物和氧化现象;预氧化涂层上预形成的氧化膜阻止了外部O2 -和熔盐中的S2 -、Cl -等物质直接接触涂层，降低了氧化层中TiO2的生成速率，从而形成了al2o3基氧化膜，降低了涂层表面氧化膜的生长速率。抑制了氧化层中氧化物之间热膨胀系数不同而引起的内应力引起的氧化膜开裂和剥落;因此，涂层的耐热腐蚀性能明显提高。

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EFFECTS OF PRE-OXIDATION ON HOT CORROSION RESISTANCE OF Al–Si COATINGS

In this study, effects of pre-oxidation on the hot corrosion behaviour of Al–Si coatings in a Na2SO4 and 25 w/% NaCl mixture at 900 °C were investigated. The results showed that after 120 h of corrosion, a large amount of β-NiAl residual was found with no obvious sulphides or oxidation in the pre-oxidised Al–Si coating. The pre-formed oxide film on the pre-oxidised coating prevented external O2– and species such as S2– and Cl– from the molten salts from directly contacting the coating and reduced the rate of TiO2 formation in the oxide layer, thus forming an Al2O3-based oxide film and reducing the growth rate of the oxide film on the coating surface. Cracking and peeling of the oxide film, caused by the internal stress owing to the difference in the thermal expansion coefficient between the oxides in the oxide layer, are suppressed; thus, the hot corrosion resistance of the coating is significantly improved. .

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来源期刊

Materiali in tehnologije 工程技术-材料科学：综合

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal MATERIALI IN TEHNOLOGIJE/MATERIALS AND TECHNOLOGY is a scientific journal, devoted to original papers and review scientific papers concerned with the areas of fundamental and applied science and technology. Topics of particular interest include metallic materials, inorganic materials, polymers, vacuum technique and lately nanomaterials.