采用两种不含氢氟酸或氟化物的溶液(i过氧化氢和硫酸,ii过氧化氢和氢氧化钠)对比研究钛合金阳极氧化膜的退除行为.采用扫描电镜和拉曼光谱分析氧化膜退除前后的形貌和结构,采用原子力显微镜表征样品表面三维形貌和粗糙度.结果表明:氧化膜均能被这两种溶液退除,但溶液i退除后表面会有残余氧化物.两种退膜方法均明显受钛合金基体微观结构的影响,条状α相和β相较易受溶液i影响,而等轴a相更易被溶液ii溶解.溶液ii退除后的表面明显比溶液i退除后的表面平整.相对于i,溶液ii更环保,效果更好.
Two methods for stripping of anodic oxide films formed on titanium alloys Ti-6.5Al-1Mo-1V-2Zr without hydrofluoric acid or fluoride were studied:i using hydrogen peroxide with sulfuric acid and ii using hydrogen peroxide with sodium hydroxide.The morphologies and microstructures of the oxide films before and after stripping were compared by SEM and Raman spectroscopy.The surface topography and roughness of the samples were detected by AFM.The results show that the oxide films can be stripped both by the two methods and the stripping process is affected by the microstructure of the matrix material obviously.β or platelet α phases are more affected by the solution i while globular α phase is preferentially dissolved by the solution ii.The surface stripped by solution ii is flatter than that by solution i.Compared to solution i,solution ii presents better environmental friendly result and lower cost.
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