摘要
研究溶液电导率对ZM5镁合金微弧氧化膜层结构和性能的影响.使用涂层测厚仪、粗糙度检测仪、维氏硬度仪、游标卡尺、天平、维氏硬度仪、SEM、EDS、XRD、电化学工作站分别对膜层厚度、粗糙度、外延生长率、致密度、显微硬度、微观形貌、元素组成和分布、晶相结构和电化学性能进行测试分析.结果表明,随着溶液电导率的增加,膜层厚度、粗糙度、外延生长率、显微硬度逐渐增加,外观和致密度无明显变化,微观形貌中放电微孔数量逐渐增加,晶相结构中MgO、MgF2和 K2MgF4的含量没有明显差别,Mg和0含量基本保持稳定,F元素的含量随导电率增加下降明显.膜层的耐蚀性随溶液电导率增加而增大,电导率为30 ms/cm时,耐蚀性最强.
Abstract
Study the effect of solution conductivity on the structure and properties of micro arc oxidation coatings on ZM5 magnesium alloy.Using a coating thickness gauge,roughness tester,vickers hardness tester,vernier caliper,balance,vickers hardness tester,SEM,EDS,XRD,and electrochemical workstation,the film thickness,roughness,epitaxial growth rate,density,microhardness,microstructure,element composition and distribution,crystal structure,and electrochemical performance were tested and analyzed.The results showed that as the conductivity of the solution increased,the thickness,roughness,epitaxial growth rate,and microhardness of the film layer gradually increased,and there was no significant change in appearance and density.The number of discharge micropores in the microstructure gradually increased,and there was no significant difference in the content of MgO,MgF2,and K2MgF4 in the crystalline structure.The content of Mg and 0 remained stable,and the content of F element decreased significantly with the increase of conductivity.The corrosion resistance of the membrane layer increases with the increase of solution conductivity.When the conductivity is 30ms/cm,the corrosion resistance is the strongest.
维普
万方数据