Effect of Nano-CeO2 on Anticorrosion Performance for Polyurethane Coating

doi:10.11902/1005.4537.2016.147

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (5): 411-420 DOI: 10.11902/1005.4537.2016.147

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Effect of Nano-CeO₂ on Anticorrosion Performance for Polyurethane Coating

Guangyi CAI¹,Haowei WANG²,Weihang ZHAO¹,Zehua DONG¹(

)

1 Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 AVIC Special Vehicle Research Institute, Jingmen 448000, China

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Abstract

Salt spray test and immersion test for two accelerated weathering tests were carried out to research the effects of nano-CeO₂ as a pigment to the corrosion resistance of polyurethane coating. According to EIS, ATR-FTIR, SEM and AFM characterized and analyzed the performance and micromorphology change of coating. The results show that as a pigment nano-CeO₂ could decrease the rate of resistance reduction of polyurethane coating. When the concentration of adding nano-CeO₂ was less than 0.5%(mass fraction), the EIS impedance spectrum dropped rapidly with acceleration time elapsed due to the electrolyte and H₂O penetration into coating quickly and nano-CeO₂ hydrolysis. While the corrosion resistance get markedly changed and maintained high impedance for a long time of the coating with additive 1.0% nano-CeO₂. This phenomenon may be due to CeO₂ hydrolysis in coating micro crack, reduced the pore channel, and Ce(III, IV) migrated to the Al alloy/coating interface, inhibiting the corrosion of active site, thus decreasing the attenuation process of impedance. At the later stage of salt spray test, CeO₂ further hydrolysis leaded to Ce ions dissolution erosion, which caused micro cracks expansion again and coating impedance reducing quickly. When the addition of nano-CeO₂excessed 1.0% would weaken the adhesion of coating on aluminum alloy matrix. Long time immersion test showed that 1.0% of nano-CeO₂ could achieve balance of Ce ions dissolution and migration, and increased the anticorrosion performance of PU coating.

Key words: coating nano-CeO₂ EIS anticorrosion performance AFM

Received: 08 September 2016

Fund: Supported by National Natural Science Foundation of China (51371087)

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	Guangyi CAI
	Haowei WANG
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Cite this article:

Guangyi CAI,Haowei WANG,Weihang ZHAO,Zehua DONG. Effect of Nano-CeO₂ on Anticorrosion Performance for Polyurethane Coating. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 411-420.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.147 OR https://www.jcscp.org/EN/Y2017/V37/I5/411

Fig.1 EIS of the polyurethane coatings with different contents of CeO₂ nanoparticles in 3.5%NaCl solution

Fig.2 Variations of the resistance and capacitance of the modified polyurethane coatings with the adding concentration of nano-CeO₂ (a) and equivalent circuit models of coatings (b)

Fig.3 Nyquist plots of the polyurethane coatings with 0% (a), 0.125% (b), 0.25% (c), 0.5% (d), 1.0% (e) and 2.0% (f) nano-CeO₂ after immersion in 3.5%NaCl solution for different time

Fig.4 Equivalent circuit models of the coatings at early stage (a), middle stage (b) and later stage (c)

Fig.5 Variations of |Z_{0.01 Hz}| of the different coatings with immersion time in 3.5%NaCl solution

Fig.6 Nyquist plots of the coatings with 0% (a), 0.125% (b), 0.25% (c), 0.5% (d), 1.0% (e) and 2.0% (f) nano-CeO₂ after salt spray test for different time

Fig.7 Variations of |Z_{0.01 Hz}| for the different coatings during salt spray test

Fig.8 FT-IR spectra of the coatings with 0% (a), 0.125% (b), 0.25% (c), 0.5% (d), 1.0% (e) and 2.0% (f) nano-CeO₂

Fig.9 Schematic diagrams of inhibitive mechanism of CeO₂ in polyurethane coating

Fig.10 AFM phase images of the polyurethane coating (a) and coatings containing 0.125% (b), 0.25% (c), 0.5% (d), 1.0% (e) and 2.0% (f) nano-CeO₂

Fig.11 Surface roughness of phase (a) and height (b) chan-ges of the different coatings after SST and immersion test

Fig.12 Optical images of the scratched coatings after spray test for 120 h with 0% (a), 0.125% (b), 0.25%(c), 0.5% (d), 1.0% (e) and 2.0% (f) nano-CeO₂

Fig.13 SEM images of the polyurethane coatings with 0% (a, c) and 1.0% nano-CeO₂ (b, d) before (a, b) and after (c, d) 158 h immersion test, respectively

Fig.14 EDS analysis results of the polyurethane coating with 1.0% nano-CeO₂ after immersion for 1 h (a) and 158 h (b)

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