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. 2022 Aug 2;14(15):3144.
doi: 10.3390/polym14153144.

Corrosion Resistance and Thermal Conductivity Enhancement of Reduced Graphene Oxide-BaSO4-Epoxy Composites

Tung-Yuan Yung  1 , Wen-Fang Lu  1 , Kun-Chao Tsai  1 , Jeng-Shiung Chen  2 , Kwan-Nang Pang  3 , Yu-Chih Tzeng  4 , Hsin-Ming Cheng  5 , Po-Tuan Chen  6
Affiliations

Corrosion Resistance and Thermal Conductivity Enhancement of Reduced Graphene Oxide-BaSO4-Epoxy Composites

Tung-Yuan Yung et al. Polymers (Basel). .

Abstract

The results of studies on the corrosion protectiveness and thermal conductivity of reduced graphene oxide-BaSO4 epoxy composites are reported here. A commercial epoxy resin and reduced graphene oxide (rGO) were blended with a hardening reagent and then mixed with prepared BaSO4-epoxy resin (B-epoxy). The reduced graphene oxide-BaSO4-epoxy composite (rGO-B-epoxy) paste was used to coat the surfaces of Al 7205 alloy and the corrosion and thermal properties were investigated. A corrosion test in a 3.5 wt% synthetic sea water solution showed that the composite coating containing BaSO4 had the best corrosion resistance. Moreover, the rGO-B-epoxy composite showed better protection against corrosion than the epoxy alone. The rGO-B-epoxy composite with 5 wt% BaSO4 had an in-plane coefficient of thermal conductivity of approximately 165.0 W/m K, and the in-plane thermal diffusivity was 71.38 mm2/s. In standard thermal conductivity tests, all three samples had values below 40 W/m K. The rGO-B-epoxy composites showed good surface corrosion protection and in-plane thermal conductivity.

Keywords: composite; corrosion resistance; epoxy; graphene; thermal conductivity.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) In-plane holder for measurement of surface thermal diffusivity and conductivity (from Netsch website) and (b) electrochemical test apparatus using in this study (sample as working electrode).
Figure 2
Figure 2
Characterizations of reduced graphene oxide (rGO) produced via (a) TGA, (b) Raman spectra with 532 nm laser excitation, (c) FTIR, (d) XRD, (e) XPS, (f) SEM, (g) TEM, and (h) AFM.
Figure 3
Figure 3
TEM/EDS analysis results for B–epoxy matrix. (a) secondary-electron image, (b) Ba elements mapping, (c) oxygen element mapping, (d) sulfur element mapping.
Figure 4
Figure 4
Electron images of 5 wt% rGO–B–epxoy. (a) secondary-electron image, (b) Ba elements mapping, (c) oxygen element mapping, (d) sulfur element mapping.
Figure 5
Figure 5
TEM and select area electron diffraction (SEAD) images of 2 wt% and 5 wt% rGO–B–epoxy composites. (a) 2 wt% rGO–B–epoxy in 2000 magnification, (b) 2 wt% rGO–B–epoxy in 10,000 magnification, (c) SEAD pattern for 2 wt% rGO–B–epoxy, (d) 5 wt% rGO–B–epoxy in 2000 magnification, (e) 5 wt% rGO–B–epoxy in 10,000 magnification, (f) SEAD pattern for 5 wt% rGO–B–epoxy.
Figure 6
Figure 6
XRD results for B–epoxy and rGO–B–epoxy composites.
Figure 7
Figure 7
(a) TAFEL plot and (b) OCP for rGO–B–epoxy and B–epoxy. (black for B–epoxy; green for 2 wt% rGO–B–epoxy, and purple for 5 wt% rGO–B–epoxy).
Figure 8
Figure 8
TGA results for epoxy-based composite coatings (left) and IDPT method by Doyle (right).
See this image and copyright information in PMC

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