【摘要】 采用热分解法和sol-gel法制备了Ru-Ti-Ir-Ta/Ti四元金属氧化物钛阳极,采用XRD对比不同阳极涂层的相组织结构,通过SEM观察不同阳极失效前后的显微形貌,讨论了不同阳极的强化失效特点。结果表明,两种方法制备的阳极涂层相成分都以(Ir,Ta)O2和(Ti,Ru)O2金红石固溶体相为主,热分解法制备的涂层中还存有单质金属钌。阳极涂层表面的显微形貌有明显不同,热分解法制备的阳极失效前可见明显的"泥裂状"裂纹,表面有金属Ru晶粒析出;Sol-gel法制备的钛阳极呈碎石状,表面有相对微细、均布的裂纹。两种钛阳极失效特点也不相同,热分解样品失效后的表面可见腐蚀坑,涂层剥落,其失效的主要原因是溶蚀剥落型复合失效;Sol-gel样品失效后的表面仍保留绝大部分涂层,钛阳极的失效是由钝化失效所致。更多还原

【Abstract】 Ru-Ti-Ir-Ta/Ti titanium anodes were prepared by thermal decomposition and sol-gel.The phase tissue structures of coatings prepared by both methods were compared by means of XRD.The micro-morphologies before and after failure of both coatings were observed by SEM.The failure features were discussed.The coatings prepared by the two techniques were mainly rutile-type solid solution(Ir,Ta)O2 and(Ti,Ru)O2-based phases.Metallic Ru was found in the coating prepared by thermal decomposition.The morphologies of both coatings were different.The former was distinctly dry cracked-mud like with metal Ru depositing and distributing on the surface of the titanium anode whereas the latter was detritus-like with narrower and even cracks.The failure features of both anodes were also different.The corrosion hole could be seen with coating segments peeled from the surface of the failured anode.Dissolving corrosion and desquamating were the main disabled factors of the anode prepared by thermal decomposition.Deactivation was the main failure factor of the anode prepared by sol-gel for most of the coating remained on the surface of the failured anode.更多还原