Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings
The effects of laser scanning speed on the microstructure, microhardness, and corrosion behavior of Ni45 coatings were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness, and electrochemical measurements. The results showed that...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2020/1438473 |
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| author | Yanxin Qiao Jie Huang Ding Huang Jian Chen Wen Liu Zhengbin Wang Zheng Zhibin |
| author_facet | Yanxin Qiao Jie Huang Ding Huang Jian Chen Wen Liu Zhengbin Wang Zheng Zhibin |
| author_sort | Yanxin Qiao |
| collection | DOAJ |
| description | The effects of laser scanning speed on the microstructure, microhardness, and corrosion behavior of Ni45 coatings were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness, and electrochemical measurements. The results showed that increasing laser scanning speed promotes the transformation from planar crystals to dendrites and refines the grains concurrently. The γ-(Ni, Fe), FeNi3, and M23(C,B)6 are identified as the primary phase composition in the Ni45 coatings regardless of the laser scanning speed. Thereinto, the formation and growth of M23(C,B)6 precipitates can be inhibited with increasing laser scanning speed due to the higher cooling rate, which affects the microhardness distribution and corrosion resistance of the coating. On the one hand, the microhardness of the whole coating presents a downtrend with increasing laser scanning speed due to the reduction of M23(C,B)6 phase. On the other hand, the corrosion resistance in 0.5 M NaCl solution is improved to some extent at higher laser scanning speed because the less precipitation of M23(C,B)6 reduces the depletion of Cr around the precipitates. In contrast, all the coatings exhibit undifferentiated but poor corrosion resistance in the highly corrosive 0.5 M NaCl + 0.5 M H2SO4 solution. |
| format | Article |
| id | doaj-art-7d68247abe444f2d8dbde70ab0207b22 |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-7d68247abe444f2d8dbde70ab0207b222025-02-03T06:43:44ZengWileyJournal of Chemistry2090-90632090-90712020-01-01202010.1155/2020/14384731438473Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 CoatingsYanxin Qiao0Jie Huang1Ding Huang2Jian Chen3Wen Liu4Zhengbin Wang5Zheng Zhibin6School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaCAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaGuangdong Key Laboratory for Technology and Application of Metal Toughening, Guangdong Institute of Materials and Processing, Guangzhou 510650, ChinaThe effects of laser scanning speed on the microstructure, microhardness, and corrosion behavior of Ni45 coatings were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness, and electrochemical measurements. The results showed that increasing laser scanning speed promotes the transformation from planar crystals to dendrites and refines the grains concurrently. The γ-(Ni, Fe), FeNi3, and M23(C,B)6 are identified as the primary phase composition in the Ni45 coatings regardless of the laser scanning speed. Thereinto, the formation and growth of M23(C,B)6 precipitates can be inhibited with increasing laser scanning speed due to the higher cooling rate, which affects the microhardness distribution and corrosion resistance of the coating. On the one hand, the microhardness of the whole coating presents a downtrend with increasing laser scanning speed due to the reduction of M23(C,B)6 phase. On the other hand, the corrosion resistance in 0.5 M NaCl solution is improved to some extent at higher laser scanning speed because the less precipitation of M23(C,B)6 reduces the depletion of Cr around the precipitates. In contrast, all the coatings exhibit undifferentiated but poor corrosion resistance in the highly corrosive 0.5 M NaCl + 0.5 M H2SO4 solution.http://dx.doi.org/10.1155/2020/1438473 |
| spellingShingle | Yanxin Qiao Jie Huang Ding Huang Jian Chen Wen Liu Zhengbin Wang Zheng Zhibin Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings Journal of Chemistry |
| title | Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings |
| title_full | Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings |
| title_fullStr | Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings |
| title_full_unstemmed | Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings |
| title_short | Effects of Laser Scanning Speed on Microstructure, Microhardness, and Corrosion Behavior of Laser Cladding Ni45 Coatings |
| title_sort | effects of laser scanning speed on microstructure microhardness and corrosion behavior of laser cladding ni45 coatings |
| url | http://dx.doi.org/10.1155/2020/1438473 |
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