중방식도료의 내식성에 관한 전기화학적 평가
An Electrochemical Evaluation on the Corrosion Resistance of Heavy Anticorrosive Paint
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Abstract
An electrochemical evaluation on the corrosion resistance for heavy anticorrosive paint(DFT:25um) was carried out for 5 kinds of heavy anticorrosive paints such as high solid epoxy(HE), solvent free epoxy(SE), tar epoxy(TE), phenol epoxy(PE), and ceramic epoxy(CE). Corrosion current densities obtained by Tafel extrapolation method from anodic and cathodic polarization curves didn't correspond with the values obtained by AC impedance measurement, however, the values of polarization resistance obtained from the cyclic voltammogram showed a good tendency corresponding well with the values of AC impedance measurement. Futhermore there was a good correlation against the corrosion resistance evaluation between passivity current density of the anodic polarization curve and diffusion limiting current density of the cathodic polarization curve. And corrosion resistance increased with corrosion potential shifting to noble direction. From the results discussed above, HE and CE had a relatively good corrosion resistance than other heavy anticorrosive paints.
참고문헌 (6)
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