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| Effect of Soaking Time on Electrochemical Corrosion Behavior of Two Kinds of Coatings |
| Received:October 13, 2015 Revised:April 15, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2016.02.001 |
| KeyWord:coating soaking corrosion resistance polarization curve |
| Author | Institution |
| GUO Jing |
The Second Production Plant， Daqing Oilfield Co.， Ltd.， Daqing ， China |
| JIANG Feng-song |
The Second Oil Construction Company， Daqing Oilfield Engineering Construction Co.， Daqing ， China |
| CAI Rui |
CNPC Key Laboratory for Oil Tubular Goods Engineering， Xi′ an ， China |
| ZHANG Juan-tao |
CNPC Key Laboratory for Oil Tubular Goods Engineering， Xi′ an ， China |
| LIN Guan-fa |
CNPC Key Laboratory for Oil Tubular Goods Engineering， Xi′ an ， China |
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| Abstract: |
| Objective To analyze the effect of soaking time on electrochemical corrosion behavior of two kinds of coatings. Methods The electrochemical method and SEM were used to obtain the polarization curves and surface morphologies of the two coatings in 3.5% NaCl solution with the saturation of CO2 gas during the test at different soaking time. Results The results showed that the corrosion potential Ecorr of the same kind of coating decreased and its current density increased with the soaking time under the same condition. The corrosion potential Ecorr of coating A was higher than that of the coating B and the current density was lower than that of the coating B with the same soaking time, which showed that the corrosion resistance of the coating A was significantly superior to that of the coating B. Conclusion When the soaking time of the coating was short (≤72 h), there was a single capacitive arc with absorbing oxygen process in EIS, but when the soaking time was long (≥120 h), there were two capacitive arcs with hydrogen evolution process in EIS, which showed that the corrosion resistance of the coating decreased in the latter case. |
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