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AZ91D鑄造鎂合金交流脈沖雙極微弧電沉積陶瓷膜

Microarc Electrodeposition of Ceramic Coatings on Double Electrodes of AZ91D Magnesium Alloy by AC Pulse Method

  • 摘要: 利用交流脈沖方法在AZ91D鑄造鎂合金表面成功實現陰、陽極微弧電沉積陶瓷膜,并使用SEM和XRD等手段對陶瓷膜的厚度、組織形貌、成分、結構和耐蝕性作了相應研究分析.結果表明,應用交流脈沖方法不僅能夠在AZ91D鑄造鎂合金上實現陰、陽雙極微弧電沉積陶瓷膜,同時在陰、陽極陶瓷膜中電沉積有稀土元素Ce.通過比較動電位掃描極化曲線和交流阻抗分析發現陰、陽極微弧氧化處理后AZ91D鎂合金的耐蝕性得到顯著提高.

     

    Abstract: It was carried out successfully to microarc electrodeposit ceramic coatings on the anode and cathode of AZ91D magnesium cast alloy with AC pulse method. The thicknesses, morphologies, composition and micro-structures of the coatings were studied by scanning electron microscopy (SEM) and X ray diffraction (XRD). Rare earth element as Ce can deposit in the anode and cathode ceramic coatings on AZ91D cast alloy besides that both electrodes have formed the same characteristic ceramic coatings. By comparing the electrochemical impendence spectroscopies (EIS) and potentiodynamic scanning polarization curves of the anode and cathode coatings, it was found that microarc oxidation (MAO) coatings on the anode and cathode of AZ91D have better corrosion resistance than that of bare AZ91D magnesium cast alloy.

     

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