Influence of Nano-Cr2O3 on Corrosion Resistance of Epoxy Coatings

doi:10.11901/1005.3093.2014.427

Chinese Journal of Materials Research

2014, Vol. 28

Issue (12): 934-941 DOI: 10.11901/1005.3093.2014.427

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Influence of Nano-Cr₂O₃ on Corrosion Resistance of Epoxy Coatings

Wei SUN¹,Guilai YIN²,Fuchun LIU^1,^**(

),Nan TANG²,Enhou HAN¹,Junbiao WAN²,Jingwei DENG²

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. State Grid Jiangxi Electric Power Research Institute, Nanchang 330096

Cite this article:

Wei SUN,Guilai YIN,Fuchun LIU,Nan TANG,Enhou HAN,Junbiao WAN,Jingwei DENG. Influence of Nano-Cr₂O₃ on Corrosion Resistance of Epoxy Coatings. Chinese Journal of Materials Research, 2014, 28(12): 934-941.

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Abstract

Spherical Cr₂O₃ nanoparticles of 10-20 nm in diameter were prepared by combustion method. Then the effect of Cr₂O₃ particles addition on the corrosion resistance of epoxy coatings applied on hot-dip galvanized steel sheet was investigated by electrochemical impedance spectroscopy (EIS) and salt-spray tests. The results show that the addition of Cr₂O₃ particles can significantly enhance the corrosion resistance of epoxy coatings, because the addition of Cr₂O₃ particles results in decreasing the porosity and increasing the physical shielding function of the coatings. And Cr³⁺ may react with Zn²⁺ and OH^- in the corrosive medium, produce insoluble ZnCr₂O₄ barrier film.

Key words: materials failure and protection nanoparticles epoxy coating power transmission and electric transmission and transformation equipment anticorrosive materials

Received: 18 August 2014

Fund: *Supported by State Grid Practical Project No.521820130014.

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	Wei SUN
	Guilai YIN
	Fuchun LIU
	Nan TANG
	Enhou HAN
	Junbiao WAN
	Jingwei DENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.427 OR https://www.cjmr.org/EN/Y2014/V28/I12/934

Fig.1 XRD spectrum of Cr₂O₃ particles

Fig.2 TEM image of Cr₂O₃particles

Fig.3 Coated panels after salt spray tests for 2000 h, (a) Z₀, (b) Z₁, (c) Z₃, (d) Z₅

Fig.4 SEM images of the scribe sections of coated panels after 2000 h salt spray tests, (a) Z₀, (b) Z₁, (c) Z₃, (d) Z₅

Fig.5 EDX diagrams of the scribe sections of coated panels after salt spray tests (a) Z₀, (b) Z₁, (c) Z₃, (d) Z₅

Fig.6 Bode plots for the different content of Nano-Cr₂O₃coatings affter different immersing times in3.5%NaCl solution, (a) Z_0, (b) Z₁ (c) Z₃, (d) Z₅

Fig.7 EEC models for the coatings at different immersion stages, (a) equivalent circuit for the intact coating has one time constant, (b) equivalent circuit for the coating have two-time constant

Fig.8 Changes of the coating resistance and capacitance during immersion

Fig.9 Change of water absorption of the coatings with immersion time

Fig.11 XRD spectrum of the interface of coating and hot dip galvanizing

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