PHOTOGENERATED CATHODE PROTECTION PROPERTIES OF Zn-Co-TiO2 NANOCOMPOSITE COATINGS

J Chin Soc Corr Pro

2012, Vol. 32

Issue (4): 327-332 DOI:

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PHOTOGENERATED CATHODE PROTECTION PROPERTIES OF Zn-Co-TiO₂ NANOCOMPOSITE COATINGS

WAN Binghua^1,2, FEI Jingyin¹, FENG Guangyong², ZHANG Wuhua¹, WANG Shaolan¹

1. Department of Applied Chemistry, College of Science, Northwestern Polytechnical University, Xi'an 710072
2. Tianjin Aerospace Precision Products Co., Ltd, Tianjin 300300

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Abstract Zn-Co-TiO₂ nanocomposite coatings were prepared by electrodeposition technique on mild steel. SEM, EDS and XRD examinations revealed that 12.63% TiO₂ nanoparticles were uniformly dispersed in the nanocomposite coating and refined the crystalline size, consequently, the corrosion resistance of Zn-Co alloy coatings was further improved. The photogenerated cathode protection properties of Zn-Co-TiO₂ nanocomposite coating were investigated by monitoring the electrode potential under ultraviolet (UV) illuminated conditions, The results showed the electrode potentials of Zn-Co-TiO₂ nanocomposite coating negatively shifted under UV illuminated, which indicated that Zn-Co-TiO₂ nanocomposite coating had photogenerated cathode protection properties; When the UV light was turned off, the electrode potentials shifted to the positive direction but were still lower than the initial electrode potential before UV illuminated; it was also found that the oxidation at 400℃ for 6 h could further improve the photogenerated cathode protection properties and the reason for this is attributed to photogeneated cathode protection properties of ZnO layer generated on the surface and its synergy with TiO₂.

Key words: photogenerated cathode protection Zn-Co alloy coating TiO₂ electrodeposition corrosion resistance

Received: 20 June 2011

ZTFLH:

TG174.41

Corresponding Authors: WAN Binghua E-mail: wanbinghua2009@163.com

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WAN Binghua, FEI Jingyin, FENG Guangyong, ZHANG Wuhua, WANG Shaolan. PHOTOGENERATED CATHODE PROTECTION PROPERTIES OF Zn-Co-TiO₂ NANOCOMPOSITE COATINGS. J Chin Soc Corr Pro, 2012, 32(4): 327-332.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I4/327

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