Improvement in corrosion resistance of WE43 magnesium alloy by the electrophoretic formation of a ZnO surface coating

  • J. E. QuEmail author
  • M. Ascencio
  • L. M. Jiang
  • S. Omanovic
  • L. X. YangEmail author


A highly active Mg alloy, WE43, was electrophoretically coated by ZnO nanoparticles followed by heat treatment with the aim of decreasing its initial corrosion resistance for possible applications as biodegradable body implants. The investigation of the corrosion behavior of the coated WE43 surface was performed by electrochemical impedance spectroscopy in a phosphate-buffered saline solution (PBS). It was found that the highest corrosion protection resistance was achieved when the coating was formed at a cell voltage of 3 V during a 210 min deposition time. The corrosion protection efficiency of this coating was excellent, above 99.9% during a 6 h of immersion in PBS. The coating was found to be polycrystalline with a preferential growth direction along the c-axis, and the outer layer was composed of complex compounds containing oxides, carbonates, and hydroxides of Zn and Mg. The deposited ZnO nanoparticles were observed to be fused to an integral coating by heat treatment and thus provided excellent physical barrier against transport of corrosion species.


WE43 magnesium alloy Electrophoretic deposition ZnO nanoparticles Corrosion Coatings 



The authors would like to acknowledge the financial support from China Scholarship Council (201208420627), from State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology (Grant No. 2019-021), from the National Science and Engineering Research Council of Canada, and from Opening Project of Engineering Research Center of Nano-Geo Materials of Ministry of Education of China University of Geosciences (NGM2018KF015).


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Copyright information

© American Coatings Association 2019

Authors and Affiliations

  1. 1.Key Laboratory of Green Preparation and Application for Functional Materials, Ministry of EducationHubei UniversityWuhanPeople’s Republic of China
  2. 2.Department of Chemical EngineeringMcGill UniversityMontrealCanada
  3. 3.School of Material Science and EngineeringNanchang Hangkong UniversityNanchangPeople’s Republic of China
  4. 4.Faculty of Materials Science and ChemistryChina University of GeosciencesWuhanPeople’s Republic of China

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