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| EFFECT OF MAGNETIC FIELD AND DICHROMATE ONANODIC POLARIZATION BEHAVIOR OF IRON IN SULFURIC ACID |
| Zhanpeng Lv;Delun Huang;Wu Yang |
| 上海材料研究所 |
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Abstract The effects of magnetic field and dichromate ion wi th different concentrations on anodic polarization behavior of iron in 0.5 mol/L sulfuric acid were studied by means of potentiodynamic polarization measuremen ts.Results showed that less than or equal to 0.02 mol/L dichromate did not chang e the configuration of the anodic polarization curve; anodic polarization curve s showed drastic change of the slope for E-i curve when dichromate concentra tion was more than or equal to 0.05 mol/L, and such drastic slope changing occurred at more negative potential and low current density when dichromate concentration increased.Current densities would decrease, remain unchanged ,and increase in t he presence of magnetic field in certain potential ranges, and such magnetic fi eld effect was closely related to the contribution of the cathodic and anodic re actions and the type of rate controlling steps for each reaction. Magnetic fie ld could accelerate the mass transfer process at electrode/solution interface, t hus obviously increase the current density at the slope drastic changing section of the anodic polarization, even eliminate such a section.Magnetic field could induce new current oscillation, change the pattern of the pre-existing current oscillation, or even eliminate current oscillation.Activation-passivation transi tion occurred at more noble potential and higher current density in the presence of magnetic field than that in the absence of magnetic field.The model of polar ization curve with magnetic field was derived based on taking into account of th e possible active dissolution,film formation and film dissolution reactions in a nodic process, the effect of cathodic reactions, and the effect of magnetic fiel d on mass transfer processes in cathodic and anodic reactions.The model develope d here matched well with the experimental results that magnetic field resulted i n different effects on current densities in different potential ranges.
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Received: 10 December 1999
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Corresponding Authors:
Zhanpeng Lv
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