Oxidation and Electrochemical Behavior of Monolayer-Graphene-Coated Copper in Simulated Primary Water

doi:10.1007/s40195-015-0365-y

Abstract

Abstract:

In high-temperature and high-pressure water, traditional anticorrosion approaches are not suitable to be used to protect structural materials from oxidation and corrosion. In this study, monolayer graphene was explored as a barrier to protect the materials from degradation. The oxidation and corrosion rate of the monolayer-graphene-coated copper is much lower than that of the bare copper, suggesting that the monolayer graphene can effectively protect the copper from oxidation and corrosion in the simulated primary water of pressurized water reactors.

Key words: Monolayer graphene, Oxidation behavior, Electrochemical behavior, Simulated primary water

Hong-Liang Ming, Si-Yan Wang, Zhi-Ming Zhang, Jian-Qiu Wang†, En-Hou Han, Wei Ke. Oxidation and Electrochemical Behavior of Monolayer-Graphene-Coated Copper in Simulated Primary Water[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(1): 89-93.

Figures/Tables 7

Fig.1 SEM image of the G/Cu sample a, Raman spectrum of the graphene on the G/Cu sample b and SEM image of Cu sample c

Fig.2 SEM images of the Cu sample a and the G/Cu sample b after immersion. c and d are higher magnification SEM images of a and b, respectively

Fig.3 Raman spectrum of the monolayer graphene on the G/Cu sample after immersion

Fig.4 Polarization curves a and impedance plots b for the Cu and G/Cu samples in the simulated primary water of PWR

Fig.5 Electrical equivalent circuit used to simulate the impedance data of Cu and G/Cu

Table 1 Values of different parameters associated with the electrical equivalent circuit

Sample	R_sol (Ω cm²)	Q_f (F/cm²)	n	R_f (Ω cm²)	C_dl (F/cm²)	R_c (Ω cm²)	Chi-squared
Cu	4736	2.17×10^-6	0.63	799	1.08×10^-6	4.06×10⁵	2.44×10^-4
G/Cu	4623	1.61×10^-6	0.61	773.4	1.87×10^-6	1.67×10⁶	6.29×10^-4

Fig.6 Schematic diagrams used to explain why the graphene can protect Cu in simulated primary water: a bare Cu, b G/Cu

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