Effects of K2ZrF6 and EDTA-Na additives, voltage and their interactions on corrosion resistance of micro-arc oxidation coatings on magnesium alloys

Abstract

Abstract: Micro-arc oxidation (MAO) coatings were prepared on AZ91D magnesium alloys in alkaline phosphate-based electrolyte. The effects of the additives of K₂ZrF₆ and EDTA-Na, voltage, and their interactions on the coatings were studied based on orthogonal experiment. The thicknesses, morphologies and phase composition of the coatings were examined by using TT260 eddy-current coating thickness gauge, SEM and XRD, respectively. The corrosion resistance of the coatings in acidic media was evaluated by the HNO₃ spot test. The results showed that K₂ZrF₆, EDTA-Na, voltage and their interactions exhibit different effects on the thickness and corrosion resistance of MAO coatings. The effect of the loading voltage on the thickness and corrosion resistance of the coatings is significant. With the voltage increasing, the thickness and the corrosion resistance of the coatings are both improved significantly. The individual factor of K₂ZrF₆ has little effect on the coating thickness, but it exhibits a certain impact on corrosion resistance of the coatings. The individual factor of EDTA-Na has little effect on the coating thickness and corrosion resistance, While the interaction between K₂ZrF₆ and voltage is very significant, and the coatings with more excellent comprehensive properties can be obtained when a high concentration of K₂ZrF₆ and high concentration of EDTA-Na combine with high loading voltage.

Key words: magnesium alloy, micro-arc oxidation, K₂ZrF₆, EDTA-Na, interaction, corrosion resistance

CLC Number:

TG174

WANG Hao, MA Ying, WANG Zhan-ying, AN Ling-yun, LIU Yun-po. Effects of K₂ZrF₆ and EDTA-Na additives, voltage and their interactions on corrosion resistance of micro-arc oxidation coatings on magnesium alloys[J]. Journal of Lanzhou University of Technology, 2023, 49(2): 1-8.

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Effects of K₂ZrF₆ and EDTA-Na additives, voltage and their interactions on corrosion resistance of micro-arc oxidation coatings on magnesium alloys

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