Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin
This study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM),...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-01-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/1/89 |
| _version_ | 1797542342526238720 |
|---|---|
| author | Wei Yuan Qian Hu Jiao Zhang Feng Huang Jing Liu |
| author_facet | Wei Yuan Qian Hu Jiao Zhang Feng Huang Jing Liu |
| author_sort | Wei Yuan |
| collection | DOAJ |
| description | This study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle tests. The ODA-GO composite materials were added to SMER coatings by physical mixing. FE-SEM, water absorption, and contact angle tests were used to evaluate the physical properties of the ODA-GO/SMER coatings, while salt spray, electrochemical impedance spectroscopy (EIS), and scanning Kelvin probe (SKP) methods were used to test the anticorrosive performance of ODA-GO/SMER composite coatings on Q235 steel substrates. It was found that ODA was successfully grafted onto the surfaces of GO. The resulting ODA-GO material exhibited good hydrophobicity and dispersion in SMER coatings. The anticorrosive properties of the ODA-GO/SMER coatings were significantly improved due to the increased interfacial adhesion between the nanosheets and SMER, lengthening of the corrosive solution diffusion path, and increased cathodic peeling resistance. The 1 wt.% ODA-GO/SMER coating provided the best corrosion resistance than SMER coatings with other amounts of ODA-GO (including no addition). After immersion in 3.5 wt.% NaCl solution for 28 days, the low-frequency end impedance value of the 1 wt.% ODA-GO/SMER coating remained high, at 6.2 × 10<sup>8</sup> Ω·cm<sup>2</sup>. |
| first_indexed | 2024-03-10T13:29:15Z |
| format | Article |
| id | doaj.art-a218074b5b01469aa56d7817f3e1e4b8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:29:15Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-a218074b5b01469aa56d7817f3e1e4b82023-11-21T08:20:17ZengMDPI AGMetals2075-47012021-01-011118910.3390/met11010089Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy ResinWei Yuan0Qian Hu1Jiao Zhang2Feng Huang3Jing Liu4State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThis study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle tests. The ODA-GO composite materials were added to SMER coatings by physical mixing. FE-SEM, water absorption, and contact angle tests were used to evaluate the physical properties of the ODA-GO/SMER coatings, while salt spray, electrochemical impedance spectroscopy (EIS), and scanning Kelvin probe (SKP) methods were used to test the anticorrosive performance of ODA-GO/SMER composite coatings on Q235 steel substrates. It was found that ODA was successfully grafted onto the surfaces of GO. The resulting ODA-GO material exhibited good hydrophobicity and dispersion in SMER coatings. The anticorrosive properties of the ODA-GO/SMER coatings were significantly improved due to the increased interfacial adhesion between the nanosheets and SMER, lengthening of the corrosive solution diffusion path, and increased cathodic peeling resistance. The 1 wt.% ODA-GO/SMER coating provided the best corrosion resistance than SMER coatings with other amounts of ODA-GO (including no addition). After immersion in 3.5 wt.% NaCl solution for 28 days, the low-frequency end impedance value of the 1 wt.% ODA-GO/SMER coating remained high, at 6.2 × 10<sup>8</sup> Ω·cm<sup>2</sup>.https://www.mdpi.com/2075-4701/11/1/89graphene oxideoctadecylaminesilicone-modified epoxy resinscanning Kelvin probeelectrochemical impedance spectroscopy |
| spellingShingle | Wei Yuan Qian Hu Jiao Zhang Feng Huang Jing Liu Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin Metals graphene oxide octadecylamine silicone-modified epoxy resin scanning Kelvin probe electrochemical impedance spectroscopy |
| title | Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin |
| title_full | Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin |
| title_fullStr | Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin |
| title_full_unstemmed | Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin |
| title_short | Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin |
| title_sort | hydrophobic modification of graphene oxide and its effect on the corrosion resistance of silicone modified epoxy resin |
| topic | graphene oxide octadecylamine silicone-modified epoxy resin scanning Kelvin probe electrochemical impedance spectroscopy |
| url | https://www.mdpi.com/2075-4701/11/1/89 |
| work_keys_str_mv | AT weiyuan hydrophobicmodificationofgrapheneoxideanditseffectonthecorrosionresistanceofsiliconemodifiedepoxyresin AT qianhu hydrophobicmodificationofgrapheneoxideanditseffectonthecorrosionresistanceofsiliconemodifiedepoxyresin AT jiaozhang hydrophobicmodificationofgrapheneoxideanditseffectonthecorrosionresistanceofsiliconemodifiedepoxyresin AT fenghuang hydrophobicmodificationofgrapheneoxideanditseffectonthecorrosionresistanceofsiliconemodifiedepoxyresin AT jingliu hydrophobicmodificationofgrapheneoxideanditseffectonthecorrosionresistanceofsiliconemodifiedepoxyresin |