复合型扫描微pH电极及其在局部腐蚀中的应用  

Fabrication of Composite Scanning Micro pH Electrode and Its Application in Localized Corrosion

作　　者：邵敏华[1] 黄若双[1] 胡融刚[1] 林昌健[1] 

机构地区：[1]厦门大学化学系材料科学与工程系,固体表面物理化学国家重点实验室,厦门361005

出　　处：《物理化学学报》2002年第10期934-937,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(59871043)资助项目

摘　　要：研制了一种新型的微米级复合型扫描叫探针.该探针具有体积小、响应速度快、稳定性好和制作方便等优点,能很好地满足微区 PH快速测定的要求 应用复合型扫描微pH电极技术研究了Al/Cu合金在0.01mol·L-1NaCl溶液中开路状态下局部腐蚀发生的早期过程.A novel composite scanning micro pH electrode was fabricated. The IrOx-pH electrode produced in a carbonate melt exhibited high stability, a fast potential response and ideal Nernstian response. The slope of the electrode at 15℃ was 56. 8 mV/pH, which was very close to the theoretical value. The 90% potential response time for a pH change from 1. 75 to 13. 90 was less than 0. 5 s. The composite scanning micro pH electrode is a promising apparatus for detecting the pH distribution on metal/solution interface. pH image on the surface of Al/Cu galvanic couple showed that both the anodic and cathodic areas could be sensed well. Localized corrosion took place on the interface of Al/Cu couple. The localized corrosion developed with time and pH value around the pitting decreased gradually.

关 键 词：复合型扫描微pH电极 局部腐蚀 铝合金 IrOx-pH电极 金属/溶液界面 微区pH 测量 

分 类 号：TG172[金属学及工艺—金属表面处理]