摘要
通过单因素试验讨论了镁合金微弧氧化电解液各组分对成膜的作用，得到电解液最佳配方：10g／L（NaP03）6，5g／LNH4F，6g／LKOH，6mL／LC3H8O3。用扫描电镜（SEM）、X射线衍射（XRD）和能谱（EDS）分析了陶瓷膜层的表面形貌、截面形貌、相组成及元素组成；采用点滴试验、交流阻抗和盐雾试验考察了陶瓷层的耐腐蚀性能。结果表明：膜层表面分布着大量均匀的放电微孔，孔径在1～3μm之间，膜层截面内层与基体过渡部分呈犬牙交错状态，结合良好；膜层由大量非晶态相及少量MgO组成，耐蚀性能优良。P与F元素的存在，证明了电解液组分较好地参与了微弧氧化反应。
The function of electrolyte components of microarc oxidation for magnesium alloy was discussed using single factor method. The optimal formula was obtained as follows： 10 g/L （NaPO3）6, 5 g/L NH4F, 6 g/L KOH, 6 mL/L C3H8O3. The surface and cross section morphology of the coating was observed by SEM. The phase structure and element distribution were analyzed by XRD and EDS. The corrosion resistance of the coating was determined by dropping test, ac impedance spectroscopy and salt-spray test. The results showed that a great deal of comparatively uniform discharge micropores with 1-3 μm diameter was distributed on the coating surface. The compact inner layer adheres well to the substrate. The coating is composed of amorphous and a small amount of MgO and has good corrosion resistance. The existence of P and F elements indicates that the electrolyte components participate in the micro-arc oxidation process.
出处
《电镀与涂饰》
CAS
CSCD
2008年第5期30-33,48,共5页
Electroplating & Finishing
基金
江西省自然科学基金[0450099]
关键词
镁合金:微弧氧化工艺
耐蚀性
magnesium alloy
micro-arc oxidation process
corrosion resistance
