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Abstract The components of the potential difference between two SCEs dipped respectively into the bulk solution and the occluded anolyte, and those between the cathode and the anode in localized corrosion cell have been analyzed. A group of quantitative relationships among them are deduced. Then they are verified experimentally by a simulating cell of iron in 10~(-3)N NaCl solution at room temperature. The resuits Show that, the first potential difference mentioned above are mainly composed of the ohmic drop and the diffusion potential difference between the bulk solution and the anolyte in the cell. Once the steady diffusion region between two solutions sets up, the value of the diffusion potential, difference would tend to a constant, while the ohmic drop changes with the electrode potential of the cathode. The final stable value will not change with the internal resistance of the corrosion cell. But for the latter potential difference mentioned above, it also contains third component, i. e., the difference of the electrode potentials between cathode and anode vs. SCEs. On the basis of the results and the polarization measurements, the relationships between the electrode potentials of occluded anode, corresponding to its zero current potential, passivation potential or immunity potential, and the electrode potentials of local cathode could be quantitatively established.
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Received: 25 April 1984
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Cite this article:
Du Yuanlong(Institute of Metallic Corrosion and Protection; Academia Sinica). A STUDY OF THE COMPONENTS OF THE POTENTIAL DIFFERENCE BETWEEN THE CATHODE AND THE OCCLUDED ANODE IN LOCALIZED CORROSION SYSTEM. J Chin Soc Corr Pro, 1984, 4(2): 108-118.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1984/V4/I2/108
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