Cargando…

Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating

Nanocomposite reinforced polyurethane (PU) coatings have been prepared by an ultrasonication method with polydopamine-wrapped carbon nanotubes (PDA@CNTs) as the nanofiller. The influence of the PDA@CNTs enhanced PU coating on the corrosion resistance and adhesion strength to Al-alloy was investigate...

Descripción completa

Detalles Bibliográficos
Autores principales: Cai, Guangyi, Hou, Jian, Jiang, Dan, Dong, Zehua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9081770/
https://www.ncbi.nlm.nih.gov/pubmed/35540283
http://dx.doi.org/10.1039/c8ra03267j
_version_ 1784703064300584960
author Cai, Guangyi
Hou, Jian
Jiang, Dan
Dong, Zehua
author_facet Cai, Guangyi
Hou, Jian
Jiang, Dan
Dong, Zehua
author_sort Cai, Guangyi
collection PubMed
description Nanocomposite reinforced polyurethane (PU) coatings have been prepared by an ultrasonication method with polydopamine-wrapped carbon nanotubes (PDA@CNTs) as the nanofiller. The influence of the PDA@CNTs enhanced PU coating on the corrosion resistance and adhesion strength to Al-alloy was investigated by electrochemical impedance spectroscopy and the pull-off test during cyclic ageing tests, including the salt spraying test, UV irradiation and solution immersion. A comparison of the pristine PU against CNTs modified PU coatings revealed that the higher CNTs loading (2.0 wt%) increased the heterogeneity and porosity of PU, which could deteriorate the corrosion barrier of PU due to the poor dispersity, even though it also increased the adhesion strength of PU. In contrast, the PDA wrapped CNTs could improve the dispersibility of the CNTs in the PU matrix thanks to the greater compatibility of PDA with PU compared to CNTs. Further experiments indicated that increasing the PDA@CNTs loading could improve the adhesion strength, but and also increase the corrosion resistance of the PU coating to 10(7) Ω cm(2) even after 7 cycles of ageing tests. Morphological observations indicated that the PDA@CNTs could increase the compactness and decrease the defects of PU, preventing the initiation and propagation of micro-defects in the PU coating during long-term ageing tests.
format Online
Article
Text
id pubmed-9081770
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher The Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-90817702022-05-09 Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating Cai, Guangyi Hou, Jian Jiang, Dan Dong, Zehua RSC Adv Chemistry Nanocomposite reinforced polyurethane (PU) coatings have been prepared by an ultrasonication method with polydopamine-wrapped carbon nanotubes (PDA@CNTs) as the nanofiller. The influence of the PDA@CNTs enhanced PU coating on the corrosion resistance and adhesion strength to Al-alloy was investigated by electrochemical impedance spectroscopy and the pull-off test during cyclic ageing tests, including the salt spraying test, UV irradiation and solution immersion. A comparison of the pristine PU against CNTs modified PU coatings revealed that the higher CNTs loading (2.0 wt%) increased the heterogeneity and porosity of PU, which could deteriorate the corrosion barrier of PU due to the poor dispersity, even though it also increased the adhesion strength of PU. In contrast, the PDA wrapped CNTs could improve the dispersibility of the CNTs in the PU matrix thanks to the greater compatibility of PDA with PU compared to CNTs. Further experiments indicated that increasing the PDA@CNTs loading could improve the adhesion strength, but and also increase the corrosion resistance of the PU coating to 10(7) Ω cm(2) even after 7 cycles of ageing tests. Morphological observations indicated that the PDA@CNTs could increase the compactness and decrease the defects of PU, preventing the initiation and propagation of micro-defects in the PU coating during long-term ageing tests. The Royal Society of Chemistry 2018-06-29 /pmc/articles/PMC9081770/ /pubmed/35540283 http://dx.doi.org/10.1039/c8ra03267j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Cai, Guangyi
Hou, Jian
Jiang, Dan
Dong, Zehua
Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title_full Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title_fullStr Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title_full_unstemmed Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title_short Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
title_sort polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9081770/
https://www.ncbi.nlm.nih.gov/pubmed/35540283
http://dx.doi.org/10.1039/c8ra03267j
work_keys_str_mv AT caiguangyi polydopaminewrappedcarbonnanotubestoimprovethecorrosionbarrierofpolyurethanecoating
AT houjian polydopaminewrappedcarbonnanotubestoimprovethecorrosionbarrierofpolyurethanecoating
AT jiangdan polydopaminewrappedcarbonnanotubestoimprovethecorrosionbarrierofpolyurethanecoating
AT dongzehua polydopaminewrappedcarbonnanotubestoimprovethecorrosionbarrierofpolyurethanecoating