日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 780-786

Formation of Poly(2-vinylpyridine) Films on Zn by Galvanostatic Electropolymerization

Hiroaki Nakano1, Yuki Kuwahara1,, Satoshi Oue1, Shigeo Kobayashi2, Hisaaki Fukushima1 and Jeong-Mo Yoon3

1Department of Materials Science & Engineering, Kyushu University, Fukuoka 812-8581
2Department of Applied Chemistry and Biochemistry, Kyushu Sangyo University, Fukuoka 813-8503
3School of Advanced, Materials Engineering, College of Engineering, Chonbuk National University, Chonju 561-756, Korea

Abstract:

Poly(2-vinylpyridine) films were deposited on Zn substrate by electropolymerization using galvanostatic technique at 30°C in pH 5 aqueous solution containing methanol. Films were also formed by employing cyclic voltammetry and potentiostatic techniques; these were compared with those formed using galvanostatic electrolysis. The thickness of films formed by galvanostatic electrolysis increased in proportion to the amount of charge passed during electropolymerization but decreased with increasing current density because of increased hydrogen evolution. The FT-IR spectra and the color of the films suggested that the structure of poly(2-vinylpyridine) films changed from the non-branched to the branched chain type with the higher current densities. The anodic current density for Zn dissolution in 3%NaCl solution was significantly decreased by coating with poly(2-vinylpyridine) films. After electropolymerization at 50 A⋅m-2, the anodic reaction was most inhibited, showing excellent corrosion resistance. Although the electrochemical techniques employed for the film preparation had no influence on the thickness or the structure of films, the films formed by galvanostatic electrolysis contained the fewest cracks and gave the best corrosion resistance.


(Received 2005/4/8)

Keywords:

electropolymerization, 2-vinylpyridine, Zinc, galvanostatic electrolysis, cyclic voltammetry


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