Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design
The oxidation of the metal powder during the thermal spraying process usually leads to significant deterioration of the microstructure and performance of the coating. In order to isolate the metal powder from oxygen during the spraying process, the CoNiCrAlY-Al<sub>2</sub>O<sub>3&l...
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2021
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oai:doaj.org-article:2fb358f564b24564b85d96136412c4302021-11-25T18:16:20ZCorrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design10.3390/ma142270931996-1944https://doaj.org/article/2fb358f564b24564b85d96136412c4302021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7093https://doaj.org/toc/1996-1944The oxidation of the metal powder during the thermal spraying process usually leads to significant deterioration of the microstructure and performance of the coating. In order to isolate the metal powder from oxygen during the spraying process, the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> core-shell structured powder with Al<sub>2</sub>O<sub>3</sub> as the shell was designed in this study. The influence of the core-shell structured powder on the microstructure and corrosion resistance of the HVOF coating has been studied in detail. The results show that the temperature field of the molten CoNiCrAlY powder during the spraying process is significantly changed by the Al<sub>2</sub>O<sub>3</sub> shell. The poor deformability of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> droplets leads to an increase in the porosity and unmelted particles of the coating. In addition, the significant difference is that the coating also maintains a high content of β-NiAl phase. The lower oxide content in the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> coating indicates that the core-shell structured powder significantly inhibits the oxidation of the CoNiCrAlY core powder during the spraying process. The CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> coating exhibits high corrosion potential, passive film resistance, charge transfer resistance, and low corrosion current density in 3.5 wt.% NaCl solution, indicating that the coating has excellent corrosion resistance.Wenmin GuoHonglin ZhangShan ZhaoZhibing DingBin LiuWenjuan LiHuanhuan XuHuiyuan LiuMDPI AGarticlecore-shell structured powderhigh velocity oxy-fuel spraymicrostructurecorrosionTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7093, p 7093 (2021) |
institution |
DOAJ |
collection |
DOAJ |
language |
EN |
topic |
core-shell structured powder high velocity oxy-fuel spray microstructure corrosion Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
spellingShingle |
core-shell structured powder high velocity oxy-fuel spray microstructure corrosion Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Wenmin Guo Honglin Zhang Shan Zhao Zhibing Ding Bin Liu Wenjuan Li Huanhuan Xu Huiyuan Liu Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
description |
The oxidation of the metal powder during the thermal spraying process usually leads to significant deterioration of the microstructure and performance of the coating. In order to isolate the metal powder from oxygen during the spraying process, the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> core-shell structured powder with Al<sub>2</sub>O<sub>3</sub> as the shell was designed in this study. The influence of the core-shell structured powder on the microstructure and corrosion resistance of the HVOF coating has been studied in detail. The results show that the temperature field of the molten CoNiCrAlY powder during the spraying process is significantly changed by the Al<sub>2</sub>O<sub>3</sub> shell. The poor deformability of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> droplets leads to an increase in the porosity and unmelted particles of the coating. In addition, the significant difference is that the coating also maintains a high content of β-NiAl phase. The lower oxide content in the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> coating indicates that the core-shell structured powder significantly inhibits the oxidation of the CoNiCrAlY core powder during the spraying process. The CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> coating exhibits high corrosion potential, passive film resistance, charge transfer resistance, and low corrosion current density in 3.5 wt.% NaCl solution, indicating that the coating has excellent corrosion resistance. |
format |
article |
author |
Wenmin Guo Honglin Zhang Shan Zhao Zhibing Ding Bin Liu Wenjuan Li Huanhuan Xu Huiyuan Liu |
author_facet |
Wenmin Guo Honglin Zhang Shan Zhao Zhibing Ding Bin Liu Wenjuan Li Huanhuan Xu Huiyuan Liu |
author_sort |
Wenmin Guo |
title |
Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
title_short |
Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
title_full |
Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
title_fullStr |
Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
title_full_unstemmed |
Corrosion Behavior of the CoNiCrAlY-Al<sub>2</sub>O<sub>3</sub> Composite Coating Based on Core-Shell Structured Powder Design |
title_sort |
corrosion behavior of the conicraly-al<sub>2</sub>o<sub>3</sub> composite coating based on core-shell structured powder design |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doaj.org/article/2fb358f564b24564b85d96136412c430 |
work_keys_str_mv |
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1718411371442339840 |