EFFECTS OF NaOH ON CHARACTERISTICS OF COATINGS ON ALUMINUM ALLOY BY MICRO-ARC OXIDIZATION

Journal of Chinese Society for Corrosion and protection

2012, Vol. 32

Issue (6): 520-524 DOI:

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EFFECTS OF NaOH ON CHARACTERISTICS OF COATINGS ON ALUMINUM ALLOY BY MICRO-ARC OXIDIZATION

WU Shijun

College of Biochemistry Engineering, Huhhot Vocational College, Huhhot 010070

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Abstract

Forming of ceramic coatings on surface of ZAlSi2Cu2Mg1 by micro-arc oxidization (MAO) in a Na₂SiO₃ electrolyte was investigated. The influences of content of NaOH on the conductivity of electrolytes, arc starting voltage, thicknesses of ceramic coatings, and morphology of coatings were analyzed respectively. Phase compositions of coatings were analyzed by XRD. The results show that while content of NaOH rises from 1.0 g/L to 3.0 g/L, the conductivity of electrolytes rises from 4.00 ms/cm to 26.28 ms/cm, and arc starting voltage decreases from 360 to 290 V. While the content of NaOH rises from 1.0 g/L to 2.5 g/L, the thickness of coatings increase gradually from 92 to 125 μm. But as the content of NaOH exceeds 2.5 g/L, the thickness and the proportion of compact layer decreases. The XRD result indicated that the coatings are composed of mullite, SiO₂, α-Al₂O₃, γ-Al₂O₃ and WO₃.

Key words: NaOH conductivity micro-arc oxidization coating (MAO)

Received: 02 May 2012

ZTFLH:

TG174.4

Corresponding Authors: WU Shijun E-mail: lcwwsj@163.com

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Cite this article:

WU Shijun. EFFECTS OF NaOH ON CHARACTERISTICS OF COATINGS ON ALUMINUM ALLOY BY MICRO-ARC OXIDIZATION. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 520-524.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I6/520

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