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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Autores principales: Wenmin Guo, Honglin Zhang, Shan Zhao, Zhibing Ding, Bin Liu, Wenjuan Li, Huanhuan Xu, Huiyuan Liu
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Lenguaje:EN
Publicado: MDPI AG 2021
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spelling 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
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AT honglinzhang corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT shanzhao corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT zhibingding corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT binliu corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT wenjuanli corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT huanhuanxu corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
AT huiyuanliu corrosionbehavioroftheconicralyalsub2subosub3subcompositecoatingbasedoncoreshellstructuredpowderdesign
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