Record number :
1000261
Title of article :
Electrochemical synthesis of polyaniline on mild steel in acetonitrile–LiClO4 and corrosion performance
Author/Authors :
T. Tu¨ken*، نويسنده , , A.T. O¨ zy?lmaz، نويسنده , , B. Yaz?c?، نويسنده , , M. Erbil، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
14
From page :
292
To page :
305
Abstract :
Polyaniline film could not be obtained on mild steel by direct electrooxidation of aniline in LiClO4 containing acetonitrile medium (ACN–LiClO4), because sufficient passivity of the surface could not be provided. This non-passivated metal undergoes intense dissolution, in potential region at which the monomer oxidation happens and this event prevents the formation of stable polymer film on the surface. Therefore, the electrode surface was coated with very thin polyaniline (PANi), polypyrrole (PPy) primer coatings, in monomer containing aqueous oxalic acid solution, and then the synthesis of top PANi film was achieved in aniline containing ACN–LiClO4 successfully. The corrosion behavior of PANi/PANi and PPy/PANi coated MS samples were investigated in 3.5% NaCl solution, properly. For this aim, anodic polarization curves and open circuit potential–time (Eocp–t) variation and electrochemical impedance spectroscopy (EIS) techniques were used. It was shown that PPy/PANi coating could provide much better protection for longer periods than PANi/PANi coating against the corrosion of MS. This behavior was explained with better barrier property of PPy/PANi. After 240 h of immersion time in corrosive test solution, the protection efficiency value was 97.0%, for PPy/PANi coated electrode
Keywords :
Mild steel , Corrosion , Polyaniline , Polypyrrole
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
2004
Link To Document :
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