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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 4: 784 - 788

DOI: https://doi.org/10.3724/SP.J.1077.2008.00784

Research Paper

Electrochemical Impedance Spectroscopy of PEO Coating on Aluminum Alloy in NaCl Solution

  • GUAN Yong-Jun ,
  • XIA Yuan
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  • 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100084, China;
    2. State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, China

Received date: 2007-09-19

  Revised date: 2007-11-09

  Online published: 2008-07-20

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Abstract

Various Plasma Electrolytic Oxidation (PEO) ceramic coatings were prepared on LY12 aluminum alloy by adjusting the concentration of sodium silicate solution. Optical microscope (OM), XRD and EIS were used to study their morphology, composition and anti corrosion behavior in NaCl solution. Increasing concentration of sodium silicate leads to the increase of the total coating thickness while too high and too low concentration lead to the decrease of inner dense layer. The main composition of PEO coatings prepared in 20, 40 and above 60g/L concentration solution are correspondingly alumina, alumina with mullite, and amorphous phase. The
corrosion resistance is determined by the inner dense layer. Increasing the thickness of inner dense layer can improve the anti-corrosion performance. PEO coating’s corrosion resistance in acidic, alkaline and neutral NaCl solution is proved and the corrosion mechanism involved is also discussed.

Key words： plasma electrolytic oxidation; ceramic coating; electrochemical impedance spectroscopy; corrosion mechanism

Cite this article

GUAN Yong-Jun , XIA Yuan . Electrochemical Impedance Spectroscopy of PEO Coating on Aluminum Alloy in NaCl Solution
[J]. Journal of Inorganic Materials, 2008 , 23(4) : 784 -788 . DOI: 10.3724/SP.J.1077.2008.00784

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