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Mechanical and anticorrosive properties of graphene/epoxy resin composites coating prepared by in-situ method.

Zhang Z, Zhang W, Li D, Sun Y, Wang Z, Hou C, Chen L, Cao Y, Liu Y - Int J Mol Sci (2015)

Bottom Line: The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method.The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively.The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year).

View Article: PubMed Central - PubMed

Affiliation: Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051, China. zhangY@163.com.

ABSTRACT
The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C) in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year). Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

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The Tafel plots for GNS-based epoxy resin coating with various content of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
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ijms-16-02239-f006: The Tafel plots for GNS-based epoxy resin coating with various content of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.

Mentions: The corrosion protection of Zn by a GNS-based epoxy resin coating was investigated by electrochemical impedance spectroscopy as shown in Figure 6. The corrosion potential (Ecorr), corrosion current (Icorr) and corrosion rate (Rcorr) were listed in Table 2. The Zn plate protected with GNS-based epoxy resin coating showed a lower Icorr and Rcorr than the neat epoxy resin coating, implying that the Zn plate protected with GNS-based epoxy resin coating was nobler toward electrochemical corrosion relative to the Zn plate protected with neat epoxy resin coating. For example, the GNS-based epoxy resin coating (0.7 wt %) showed a low Icorr of 0.18 μA/cm2, which is four times lower than the neat epoxy resin coating. The corresponding Rcorr of GNS-based epoxy resin coating (0.7 wt %) was ca. 0.3 mm/year, which was smaller than neat epoxy resin coating (1.3 mm/year). Although only a small proportion of PVP-rGO was incorporated into the epoxy resin matrixes, high corrosion protection was afforded. By comparison with that of epoxy resin coating containing others fillers in the previous works [28,29], the corresponding Rcorr of GNS-based epoxy resin coating was smaller. The good corrosion resistance may be attributed to the following two reasons: (1) epoxy could act as a physical barrier coating; (2) the well-dispersed graphene nanosheets embedded in epoxy matrix could prevent corrosion owing to a relatively higher aspect ratio than clay platelets, which enhances the oxygen barrier property of GNS-based epoxy resin coating [12].


Mechanical and anticorrosive properties of graphene/epoxy resin composites coating prepared by in-situ method.

Zhang Z, Zhang W, Li D, Sun Y, Wang Z, Hou C, Chen L, Cao Y, Liu Y - Int J Mol Sci (2015)

The Tafel plots for GNS-based epoxy resin coating with various content of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4307360&req=5

ijms-16-02239-f006: The Tafel plots for GNS-based epoxy resin coating with various content of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
Mentions: The corrosion protection of Zn by a GNS-based epoxy resin coating was investigated by electrochemical impedance spectroscopy as shown in Figure 6. The corrosion potential (Ecorr), corrosion current (Icorr) and corrosion rate (Rcorr) were listed in Table 2. The Zn plate protected with GNS-based epoxy resin coating showed a lower Icorr and Rcorr than the neat epoxy resin coating, implying that the Zn plate protected with GNS-based epoxy resin coating was nobler toward electrochemical corrosion relative to the Zn plate protected with neat epoxy resin coating. For example, the GNS-based epoxy resin coating (0.7 wt %) showed a low Icorr of 0.18 μA/cm2, which is four times lower than the neat epoxy resin coating. The corresponding Rcorr of GNS-based epoxy resin coating (0.7 wt %) was ca. 0.3 mm/year, which was smaller than neat epoxy resin coating (1.3 mm/year). Although only a small proportion of PVP-rGO was incorporated into the epoxy resin matrixes, high corrosion protection was afforded. By comparison with that of epoxy resin coating containing others fillers in the previous works [28,29], the corresponding Rcorr of GNS-based epoxy resin coating was smaller. The good corrosion resistance may be attributed to the following two reasons: (1) epoxy could act as a physical barrier coating; (2) the well-dispersed graphene nanosheets embedded in epoxy matrix could prevent corrosion owing to a relatively higher aspect ratio than clay platelets, which enhances the oxygen barrier property of GNS-based epoxy resin coating [12].

Bottom Line: The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method.The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively.The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year).

View Article: PubMed Central - PubMed

Affiliation: Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051, China. zhangY@163.com.

ABSTRACT
The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C) in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year). Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

Show MeSH
Related in: MedlinePlus