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| Effect of Oxide Scales on Initial Corrosion Behavior of SPHC Hot Rolled Steel in Tropical Marine Atmosphere |
DENG Junhao1,HU Jiezhen1,DENG Peichang2,WANG Gui1( ),WU Jingquan1,WANG Kun1 |
1. School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China
2. School of Chemistry and Environment, Guangdong Ocean University, Zhanjiang 524088, China |
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Abstract The effect of the existed oxide scales on the initial corrosion behavior of SPHC hot rolled steels was assessed via field exposure in tropical marine atmosphere with features of high temperature, humidity, salinity and strong irradiation in a test site at Zhanjiang district for 15, 30, 90 and 180 d. After exposure test, the steel samples were then characterized by means of XRD and SEM with EDS, while their polarization curves were also measured in 3.5% (mass fraction) NaCl solution by Autolab. The results show that the existed oxide scales on the rolled steel consist mainly of Fe3O4, which can obviously slow down the initial corrosive rate of the steel. As the corrosion progresses, the oxide scales will gradually transform into the rust layers and corrosion products are constantly generated, the corrosion behavior of the steel samples with and without the existed oxide scales tend gradually to be consistent, and the difference of their corrosion rates turn to be small. In sum, the existed oxide scales can slow down the initial corrosion rate of the rolled steel without changing the composition of corrosion products at all.
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Received: 26 November 2018
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| Fund: Supported by National Natural Science Foundation of China(51801033) |
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Corresponding Authors:
Gui WANG
E-mail: wanggui@163.com;wanggdou@163.com
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