CAJ | 학술논문

在由15 g/L Na2 SiO3、12 g/L NaAlO2、3 g/L Na2 B4 O7、5 mL/L C3 H8 O3、5 g/L C6 H5 Na3 O7及1～4 g/L NaOH组成的硅铝复合电解液中，利用微弧氧化技术在AZ91D镁合金基体上制备了一系列陶瓷膜层．利用扫描电镜、膜层测厚仪分别研究了陶瓷膜层的微观结构及厚度；采用全浸泡实验和交流阻抗实验测试了膜层在3.5％NaCl溶液中的耐蚀性能．结果表明：随着NaOH含量的增加，微弧氧化过程中的起弧电压和终止电压均呈线性下降；膜层的耐蚀性随着NaOH含量的增加先提高后降低，膜厚的变化趋势与其耐蚀性的变化趋势基本一致；NaOH含量的变化主要影响膜层内部致密层的耐蚀性能；当NaOH含量为2 g/L时，膜层最厚，膜层较致密，因而具有较好的耐蚀性能．
재유15 g/L Na2 SiO3、12 g/L NaAlO2、3 g/L Na2 B4 O7、5 mL/L C3 H8 O3、5 g/L C6 H5 Na3 O7급1～4 g/L NaOH조성적규려복합전해액중，이용미호양화기술재AZ91D미합금기체상제비료일계렬도자막층．이용소묘전경、막층측후의분별연구료도자막층적미관결구급후도；채용전침포실험화교류조항실험측시료막층재3.5％NaCl용액중적내식성능．결과표명：수착NaOH함량적증가，미호양화과정중적기호전압화종지전압균정선성하강；막층적내식성수착NaOH함량적증가선제고후강저，막후적변화추세여기내식성적변화추세기본일치；NaOH함량적변화주요영향막층내부치밀층적내식성능；당NaOH함량위2 g/L시，막층최후，막층교치밀，인이구유교호적내식성능．
Ceramic coatings were obtained on AZ91D magnesium alloy by microarc oxidation in a silicate-alumi-nate based composite electrolyte containing 15 g/L Na2 SiO3 , 12 g/L NaAlO2 , 3 g/L Na2 B4 O7 , 5 mL/L C3 H8 O3 , 5 g/L C6 H5 Na3 O7 and 1~4 g/L NaOH.The morphology and thickness of ceramic coatings were exam-ined by scanning electron microscopy ( SEM ) and layer thickness meter .The corrosion resistance of ceramic coatings in a 3.5%NaCl neutral solution was evaluated by immersion test and electrochemical impedance spec-troscopy ( EIS) .The results show that striking voltage and final voltage during the MAO process decrease gradu-ally as the concentration of NaOH increases .With the increasing of NaOH concentration in the electrolyte , the corrosion resistance of coating increases first and then decreases gradually .The variation trend of coating thick-ness is the same as that of corrosion resistance .The concentration of NaOH in the electrolyte mainly affects the corrosion resistance of the inner dense layer .The coating obtained in the electrolyte containing 2 g/L NaOH ex-hibits a better corrosion resistance due to the relatively compact microstructure and thick coating .