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| INFLUENCE OF DIFFERENT COOLING METHODS ON CORROSION RESISTANCE OF OXIDE SCALE STRUCTURE OF HOT ROLLED STRIP |
| ZHOU Xianliang1,2, ZHU Min1, HUA Xiaozhen1,YE Zhiguo1, CUI Xia1, ZOU Aihua1 |
1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063
2. Key Laboratory of Nondestructive Test, Ministry of Education, Nanchang Hangkong University, Nanchang 330063 |
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Abstract Different structures scales were formed on the surface of SS400 hot rolled strip with different cooling methods. Corrosion behaviors of hot rolled strip with different oxide scales were investigated in sodium bisulfite solution by SEM, EDS, XRD, accelerated cyclic wet-dry immersion corrosion test, polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that three kinds of oxide scales prepared by different cooling methods mainly consisted of Fe3O4, as well as a spot of Fe2O3 and Fe. The content of Fe3O4 increased with cooling rate reducing, but FeO was not detected. Oxide scale prepared by furnace cooling on the strip consisted of the outer Fe2O3 layer and the inner Fe3O4+Fe layer, and its thickness was more thick and homogeneous than the rest scales. Oxide scale prepared by jar cooling was homogeneous, but that prepared by air cooling had a lot of defects. Corrosion resistance of strip prepared by furnace cooling was best in 0.01 mol/L sodium bisulfite solution, but that of strip prepared by air cooling was worst.
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Received: 10 June 2009
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