Na2CO3-induced Gas Evolution Reaction and Morphology Modulation on Magnesium Alloy during Micro-arc Oxidation

doi:10.3724/SP.J.1077.2011.00721

Abstract

Abstract: Surface morphology of the ceramic coatings can be modulated by gas evolution on anodes during micro arc oxidation (MAO) processes. A novel technique to enhance gas evolution using Na₂CO₃-containing solution was proposed. MAO ceramic coatings were fabricated on AZ31 magnesium alloy using Na₂CO₃ as a special additive in Na₃PO₄+KOH +NaF base electrolyte. The effects of Na₂CO₃ addition on the reaction of gas evolution near the anode, morphology modulation and chemical composition were investigated by using GC-MS, SEM, XRD and FTIR, respectively. The results show that both O₂and CO₂ are evolved from the anode with Na₂CO₃ addition during MAO process. MgCO₃ is found in the coating during the anodic oxidation before MAO, while only MgO is detected in the coating after MAO process. It is attributed to the decomposition of MgCO₃ to MgO and CO₂ due to local high temperature. Na₂CO₃addition has slight effect on the microstructure of the coating and MgO is the main phase no matter whether Na₂CO₃ is utilized. With the addition of Na₂CO₃ the number of larger-size pores decreases and porosity in the coatings increases.

Key words: micro-arc oxidation, gas evolution, magnesium alloy, sodium carbonate, modulation effect

CLC Number:

TG174

WANG Xiao-Bo, TIAN Xiu-Bo, GONG Chun-Zhi, YANG Shi-Qin. Na₂CO₃-induced Gas Evolution Reaction and Morphology Modulation on Magnesium Alloy during Micro-arc Oxidation[J]. Journal of Inorganic Materials, 2011, 26(7): 721-725.

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Na₂CO₃-induced Gas Evolution Reaction and Morphology Modulation on Magnesium Alloy during Micro-arc Oxidation

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