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EFFECT OFKOHON MICRO-ARC OXIDATION COATINGS OF 2A12 ALUMINUM ALLOYS INCH3COONa–Na2WO4ELECTROLYTE

Author

Listed:
  • ZHAO QING LIN

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China)

  • HUI JUN YU

    (Key Laboratory of High-Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, School of Mechanical Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China)

  • SI YU HE

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China)

  • YI NING HE

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China)

  • CHUAN ZHONG CHEN

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China)

Abstract

The ceramic coatings were prepared on 2A12 alloy by micro-arc oxidation inCH3COONa–Na2WO4electrolyte system with different concentration ofKOHadded. The effects ofKOHin this electrolyte on micromorphology, phase compositions, adhesion and corrosion resistance of the coatings were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), scratch test and electrochemistry workstation. The results show thatKOHhas a significant influence on the surface morphology, which can make the surface smoother. The adhesion of the coating becomes stronger with the increase ofKOHin the electrolyte. The corrosion resistance of the coated specimen increases a lot compared with that of the substrate. And the lowest corrosion current density(Icorr)of the coating prepared in the electrolyte withKOHis about three orders of magnitude lower than that of the substrate.

Suggested Citation

  • Zhao Qing Lin & Hui Jun Yu & Si Yu He & Yi Ning He & Chuan Zhong Chen, 2014. "EFFECT OFKOHON MICRO-ARC OXIDATION COATINGS OF 2A12 ALUMINUM ALLOYS INCH3COONa–Na2WO4ELECTROLYTE," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 21(02), pages 1-6.
    • Handle: RePEc:wsi:srlxxx:v:21:y:2014:i:02:n:s0218625x14500267
    DOI: 10.1142/S0218625X14500267
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