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Photocathodic Protection of Cobalt Doped ZnO Nanorod Arrays for 316 Stainless Steel and Q235 Carbon Steel in 3.5 wt.% NaCl Solution

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School of Materials Science and Engineering, Tongji University, No. 4800 Caoan Road, Shanghai 201804, China
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College of Chemical Engineering, Qingdao University of Science & Technology, No.53 Zhengzhou Rd, Qingdao 266042, China
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School of Chemical Engineering and Technology, Sun Yat-Sen University Zhuhai Campus, Tangjiawan, Zhuhai 519082, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(12), 803; https://doi.org/10.3390/coatings9120803
Received: 28 October 2019 / Revised: 12 November 2019 / Accepted: 22 November 2019 / Published: 1 December 2019
(This article belongs to the Section Thin Films)
In this work, cobalt-doped ZnO nanorod arrays with anticorrosion function were successfully prepared on fluorine-doped tin oxide (FTO) substrates by a simple aqueous solution method. The XRD patterns and the energy-dispersive X-ray spectroscopy (EDX) analysis indicate the doped Co2+ were successfully incorporated into the ZnO crystal lattice. The photocurrent density and open circuit potential (OCP) results indicate the photocathodic protection performance for 316 stainless steel (316 SS) and Q235 carbon steel in a 3.5 wt.% NaCl solution under a Xe lamp with a power of 300 W was enhanced with the increase of cobalt concentration, and the photoanode with a 15% Co/Zn ratio had the optimal photocathodic protection effect. The mechanism of enhancement may be result from the narrowed band gap, the lower recombination rate of the photogenerated electron-hole pairs, the intermediate impurity level, and the split of the hypo-outer shell of cobalt ions. View Full-Text
Keywords: cobalt; ZnO; photocathodic protection; corrosion protection cobalt; ZnO; photocathodic protection; corrosion protection
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Zhang, X.; Chen, G.; Li, W.; Wu, D. Photocathodic Protection of Cobalt Doped ZnO Nanorod Arrays for 316 Stainless Steel and Q235 Carbon Steel in 3.5 wt.% NaCl Solution. Coatings 2019, 9, 803.

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