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

Zhao Qing Lin, Hui Jun Yu (), Si Yu He, Yi Ning He and Chuan Zhong Chen ()
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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

Surface Review and Letters (SRL), 2014, vol. 21, issue 02, 1-6

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.

Keywords: Micro-arc oxidation; KOH; aluminum alloy; CH3COONa–Na2WO4electrolyte (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X14500267

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