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Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum

A low infrared emissivity coating was prepared using graphene surface-modified flaky aluminum complex powders (rGO-FAl) as fillers. The flaky aluminum powders were coated with graphene through chemical bonding. Compared with pure flaky aluminum, the Vis-NIR diffuse reflectance of rGO-FAl complex pow...

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Autores principales: He, Lihua, Zhao, Yan, Xing, Liying, Liu, Pinggui, Zhang, Youwei, Wang, Zhiyong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163430/
https://www.ncbi.nlm.nih.gov/pubmed/30135376
http://dx.doi.org/10.3390/ma11091502
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author He, Lihua
Zhao, Yan
Xing, Liying
Liu, Pinggui
Zhang, Youwei
Wang, Zhiyong
author_facet He, Lihua
Zhao, Yan
Xing, Liying
Liu, Pinggui
Zhang, Youwei
Wang, Zhiyong
author_sort He, Lihua
collection PubMed
description A low infrared emissivity coating was prepared using graphene surface-modified flaky aluminum complex powders (rGO-FAl) as fillers. The flaky aluminum powders were coated with graphene through chemical bonding. Compared with pure flaky aluminum, the Vis-NIR diffuse reflectance of rGO-FAl complex powders was significantly decreased, which was beneficial to the low glossiness of the coating. After the modification, the glossiness at 60° of the coating with 40% (mass fraction) pigments decreased from 12.8 to 6.7, while the coating maintained low infrared emissivity (0.238~0.247) at a spectral range of 8–14 μm. In the electrochemical impedance spectroscopy (EIS) measurement, at the lowest frequency, the impedance of the Al-rGO test plate was at least two orders of magnitude greater than that of the control Al test plate, and the graphene layer significantly increased the bandwidth of the maximum phase angle, which indicates a good protective effect of the ultra-thin graphene layer on metal in a corrosive environment. The coating with 40% rGO-FAl complex powders can maintain its appearance after 500 h of salt spray corrosion testing. In contrast, the color of the coating with the original aluminum powders changed after only 300 h.
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spelling pubmed-61634302018-10-12 Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum He, Lihua Zhao, Yan Xing, Liying Liu, Pinggui Zhang, Youwei Wang, Zhiyong Materials (Basel) Article A low infrared emissivity coating was prepared using graphene surface-modified flaky aluminum complex powders (rGO-FAl) as fillers. The flaky aluminum powders were coated with graphene through chemical bonding. Compared with pure flaky aluminum, the Vis-NIR diffuse reflectance of rGO-FAl complex powders was significantly decreased, which was beneficial to the low glossiness of the coating. After the modification, the glossiness at 60° of the coating with 40% (mass fraction) pigments decreased from 12.8 to 6.7, while the coating maintained low infrared emissivity (0.238~0.247) at a spectral range of 8–14 μm. In the electrochemical impedance spectroscopy (EIS) measurement, at the lowest frequency, the impedance of the Al-rGO test plate was at least two orders of magnitude greater than that of the control Al test plate, and the graphene layer significantly increased the bandwidth of the maximum phase angle, which indicates a good protective effect of the ultra-thin graphene layer on metal in a corrosive environment. The coating with 40% rGO-FAl complex powders can maintain its appearance after 500 h of salt spray corrosion testing. In contrast, the color of the coating with the original aluminum powders changed after only 300 h. MDPI 2018-08-22 /pmc/articles/PMC6163430/ /pubmed/30135376 http://dx.doi.org/10.3390/ma11091502 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
He, Lihua
Zhao, Yan
Xing, Liying
Liu, Pinggui
Zhang, Youwei
Wang, Zhiyong
Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title_full Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title_fullStr Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title_full_unstemmed Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title_short Low Infrared Emissivity Coating Based on Graphene Surface-Modified Flaky Aluminum
title_sort low infrared emissivity coating based on graphene surface-modified flaky aluminum
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163430/
https://www.ncbi.nlm.nih.gov/pubmed/30135376
http://dx.doi.org/10.3390/ma11091502
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