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| The Electrochemical Impedance Spectroscopy of Dacromet coating in seawater |
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| 哈尔滨工业大学（威海） |
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Abstract The evolution of electrochemical impedance spectroscopy(EIS)and open circuit potential were obtained from dacromet-coating mild steel, which were fully soaked in seawater. The EIS was analyzed by the equivalent circuitRO (RpC) (RDQ). The resistance showed the increasing with immersing time of the polarization resistance Rp, douible layer capacity C,diffusion resistance RD and the value of RD/RP. The conclusion was drawn that Zn dissolved at the beginning of corrosion process of dacromet and its sacrificial anode effects were limited by the accumulation of corrosion products,which thickened the thickness of passivation coating. The physical barrier action was the prominent anticorrosive mean afterqards.Dacromet coating failed to protect the base for pitting afier the cooperation of diffusion and dissolution overtook the barier effects.
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Received: 09 January 2006
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