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| The Study on the Underscales Localized Corrosion Behavior of Carbon Steel in Neutral Solution |
| 华中科技大学化学系；南阳理工学院生物与化学工程学院 |
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Abstract An occluded corrosion cavity (OCC) cell which could simulate the auto-catalyzing process of localized corrosion was designed to study the under scales corrosion behavior of carbon steel in neutral NaCl solution in this paper. Electrochemical impedance spectroscopy (EIS) and linear polarization curves measurements were employed to study the variation of electrochemical behavior within the occluded anode. The result showed that the auto-catalyzing acidification process inside the OCC is exacerbated by corrosion products layer. A galvanic current produced obviously between the occluded anode and bulk cathode, the solution inside the OCC become more acid and the Cl- is centralized, occluded anode kept up activation dissolution, while the bulk cathode outside the OCC was partly or fully protected. The active dissolution in occluded anode is controlled by an irreversible charge transfer process at metal/oxide film interface. The charge transfer resistance and linear polarization resistance decrease with the short-circuited time continually. The occluded anode dissolution reaction was developed persistently by the occluded effect and become easier along with the short-circuited time continually.
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Received: 22 December 2006
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