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Hot Corrosion Behavior of SiO2-Al2O3-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl
Li, Wen-Bo; Liu, Lan-Lan; Yang, Ying-Fei; Zhu, Sheng-Long; Wang, Fu-Hui
2019-05-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:5Pages:599-606
AbstractType I hot corrosion behavior of SiO2-Al2O3-glass composite coating based on Ti-47Al-2Cr-2Nb substrate was investigated in the mixture salt of 25wt%NaCl+75wt%Na2SO4 at 850 degrees C. The results showed that there was a bidirectional ion exchange between composite coating and the film of mixed salts, and the sodium ion in the molten salts penetrated into the glass matrix of composite coating, while the potassium ion in the glass matrix dissolved into the molten salts. A decrease in hot corrosion rate was achieved for the coated alloy in comparison with the bared substrate due to the composite coating acting as a diffusion barrier to sulfur and chlorine and preventing the molten salts from diffusing to the coating/alloy interface during the hot corrosion exposure. Additionally, the composite coating decreased the oxygen partial pressure at the coating/alloy interface and promoted the selective oxidation of Al to form a protective Al2O3 layer.
KeywordCorrosion Composite coating Ti-47Al-2Cr-2Nb alloy Diffusion
Indexed BySCI
Language英语
WOS IDWOS:000463780700007
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81138
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, Wen-Bo,Liu, Lan-Lan,Yang, Ying-Fei,et al. Hot Corrosion Behavior of SiO2-Al2O3-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(5):599-606.
APA Li, Wen-Bo,Liu, Lan-Lan,Yang, Ying-Fei,Zhu, Sheng-Long,&Wang, Fu-Hui.(2019).Hot Corrosion Behavior of SiO2-Al2O3-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(5),599-606.
MLA Li, Wen-Bo,et al."Hot Corrosion Behavior of SiO2-Al2O3-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.5(2019):599-606.
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