Journal
SURFACE & COATINGS TECHNOLOGY
Volume 374, Issue -, Pages 1015-1023Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2019.06.079
Keywords
Al alloys; Zinc oxide; Plasma electrolytic oxidation; Corrosion resistance
Funding
- Soft Science Research Project of Guangdong Province [2017B030301013]
- New Energy Materials Genome Preparation & Test Key -Laboratory Project ofShenzhen [ZDSYS201707281026184]
- Shenzhen Science and Technology Research Grants [JCYJ20170306165240649, JCYJ20170818150601930]
- Hong Kong Innovation and Technology Fund (ITF) [ITS/452/17FP (CityU 9440179)]
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Aluminum alloys are widely used in the aerospace and transportation industries, but the corrosion resistance is insufficient in long-term service especially in the high salinity environment. A ceramic coating composed of ZnO nanoparticles is demonstrated to significantly improve the corrosion resistance of the Al alloys. Owing to the similar chemical activity of Zn and Al, ZnO particles fuse into Al2O3 in the micro-arc during plasma electrolytic oxidation (PEO) rendering the coating compactness. The formation mechanism of the PEO coating is investigated and discussed. The corrosion current of the ZnO modified PEO coating is 4 orders of magnitude less than that of the LY12 substrate. Immersion tests performed in 3.5 wt% sodium chloride show that incorporation of ZnO prevents destruction and dissolution of the PEO coating in the high salinity environment.
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