Effects of NaOH Concentration on Properties of Micro Arc Coatings on Magnesium Alloys

Shu Fang Zhang; Rong Fa Zhang; Wen Kui Li; Yi Min Zhong

doi:10.4028/www.scientific.net/AMR.482-484.909

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 482-484Effects of NaOH Concentration on Properties of...

Effects of NaOH Concentration on Properties of Micro Arc Coatings on Magnesium Alloys

Abstract:

Anodic coatings were prepared by micro arc oxidation on AZ91HP in a base solution of 18 g/L Na₂SiO₃ ּ9H₂Oand 4 g/L tannic acid with 5-20 g/l NaOH. The influence of NaOH concentration on final voltage and corrosion resistance were studied. The morphologies of anodic coatings were determined by environmental scanning electron microscope (ESEM). Potentiodynamic polarization test was performed in 3.5wt.% NaCl solution to evaluate the corrosion resistance of anodic coatings. The results show that the NaOH concentration has greatly effect on the final voltage, the compositions, thickness, morphologies and corrosion resistance. The corrosion resistance of anodic coatings is the best in the base solution containing 10 g/l NaOH.

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Advanced Materials Research (Volumes 482-484)

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909-913

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https://doi.org/10.4028/www.scientific.net/AMR.482-484.909

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Online since:

February 2012

Authors:

Shu Fang Zhang, Rong Fa Zhang, Wen Kui Li, Yi Min Zhong

Keywords:

Magnesium Alloy, MAO, Naoh Concentration, Property Analysis

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