Journal
CHEMICAL PHYSICS LETTERS
Volume 722, Issue -, Pages 1-5Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2019.02.030
Keywords
Electrogalvanized steel; Photo-electrochemical corrosion; ZnO; Photo-generated cathodic protection; Nano-electrodeposition
Funding
- National Natural Science Foundation of China [51804132]
- Fundamental Research Funds for the Central Universities [21618324]
- Guangdong Province Science and Technology Plan [2017B090903005]
- National Key R&D Program of China [2017YFB0305100]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2018DX03]
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The anticorrosion property of electrogalvanized steel mainly depends on the physical barrier of zinc's oxides or corrosion products to aggressive environments, which has reached a consensus for a long time. In this work, we demonstrated that the corrosion products (mainly ZnO) not only played a role of barrier layer in resisting seawater corrosion, but also provided an additional 30% of photo-generated cathodic protection for zinc coating under sunlight illumination according to the Stern-Geary resistance results. Then, we further elevated this sunlight-induced protection efficiency to approximately 100% by electrodeposition of nanocrystalline zinc, and analysed its improvement mechanism.
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