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| Research on Corrosion Behavior of Low Alloy Steel Under the Natural Seawater Wet-Dry Alternate Condition |
| Received:March 22, 2014 Revised:April 09, 2014 |
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| DOI：10.7643/issn.1672-9242.2014.03.004 |
| KeyWord:low alloy steel corrosion wet-dry ratio natural seawater |
| Author | Institution |
| WANG Kui |
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China;Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao , China |
| ZHANG Hui-xia |
Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao , China |
| GUO Wei-min |
Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao , China |
| FU Yu-dong |
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
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| Abstract: |
| Objective To calculate the average corrosion rate of samples with different wet-dry ratios, and to compare with the corrosion behavior under full immersion condition. Methods Open circuit potential, polarization resistance and electrochemical impedance of the samples in seawater were measured after various wet-dry cycles using electrochemical measurement method, and the effects of wet-dry ratio on the electrochemical properties of low alloy steel were analyzed. 3-D video microscopy was used to observe the corrosion morphology of samples with different wet-dry ratios, and X-Ray Diffraction was applied to analyze the composition of the rust-layer. Results The results showed that the corrosion rate of low alloy steel was increased by an order of magnitude, the free corrosion potential had a positive shift of 150 mV, and the polarization resistance was increased by two orders of magnitude under the wet-dry alternating condition comparing with that under full immersion in seawater. With the increase of the wet-dry ratio, the corrosion rate declined, and the free corrosion potential had no obvious change. Moreover, the polarization resistance increased at the early test stage, while there was no obvious change at the later stage. Conclusion Observation of corrosion morphology and rust-layer composition showed that the corrosion products under full immersion condition were mainly composed of FeOOH, while the amount of Fe3O4 was higher under dry-wet alternating condition. |
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