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Tribological and Corrosion Properties of Coatings Produced by Plasma Electrolytic Oxidation on the ZA27 Alloy

  • Guangyin Li
  • Yifan Mao
  • Zhijian Li
  • Linlin Wang
  • Herbert DaCosta
Article

Abstract

In this paper, a continuous and dense coating was deposited on samples of the ZA27 alloy through the plasma electrolytic oxidation (PEO) process to improve its wear and corrosion performance. A nontoxic and environmentally friendly inorganic salt, Na2SiO3, is chosen as electrolytes with different concentrations. The effect of the concentration of Na2SiO3 aqueous solutions on the coating performances was investigated. The coatings with 3Al2O3·2SiO2 (mullite), Zn2SiO4 and Al2O3 (either crystal phase or with some amorphous SiO2 phases) were formed by the PEO processes. It was found that the coating thickness increased with the increase in electrolyte concentration. However, the wear and corrosion resistance performance of the coatings did not improve as the coating’s thickness increased. This was due to the fact that the coating produced with electrolytes of 10 g/L has a porous structure with large pore size. Among all the samples, coating produced by 15 g/L Na2SiO3 has the best wear and corrosion resistance, which is attributed to its continuous and dense structure with thickness of about 47 μm.

Keywords

corrosion resistance PEO coating wear resistance ZA27 

Notes

Acknowledgments

This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant No. LY17E010002.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Guangyin Li
    • 1
  • Yifan Mao
    • 2
  • Zhijian Li
    • 1
  • Linlin Wang
    • 2
  • Herbert DaCosta
    • 3
  1. 1.School of High Temperature Materials and Magnesium Resources EngineeringUniversity of Science and Technology LiaoningAnshanPeople’s Republic of China
  2. 2.College of EngineeringZhejiang Normal UniversityJinhuaPeople’s Republic of China
  3. 3.Math, Science, and Engineering DivisionIllinois Central CollegeEast PeoriaUSA

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