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《Electronic Components and Materials》 2010-01
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Mechanism of inhibitor on electrochemical enlarging the diameter of tunnels on Al foil for high voltage anode

WANG Zhishen,HE Yedong(Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technology,Beijing 100083,China)  
The effect of polymeric corrosion inhibitor polystyrene sulfonic acid(PSSA) on electrochemical enlarging the diameter of tunnels on Al foil in 3%(mass fraction) HNO3 at 70℃ was studied.It is proved that,after adding PSSA into nitric acid solution,the thickness reduction,mass loss rate and tunnel-mergers of Al foil are all improved significantly and the capacitance formed at 520 V is increased by 23%.SEM images indicate that the morphologies of tunnel pits are transformed from the shape like as a cone to a baseball bat after adding PSSA.Furthermore,the anodic polarized curves demonstrate that the potential at the surface of Al-foil is increased,but the potential inside the surface of tunnel pits is changed slightly,which means that PSSA enhances the electrochemical reaction resistance on the surface of Al foil and at the mouth of tunnels,so that electric current distributes mainly inside the tunnel pits,and accelerates enlarging where diameter.
【Fund】: 北京地区高等学校新材料学科群建设资助项目
【CateGory Index】: O646.6
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