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| Corrosion Behavior of Q235 Steel by Outdoor Exposure and under Shelter in Atmosphere of Hainan Coastal |
WANG Honglun1, YANG Hua1, CAI Hui1, LI Bowen2( ) |
1.Xichang Satellite Launch Center, Xichang 615000, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract The corrosion behavior of Q235 steel was studied by outdoor exposure and under the shelter of an awning respectively in the same atmosphere at one test site located at the coastal of Hainan island in the South China Sea by means of mass loss method, electrochemical test methods, macro-morphology, cross-sectional micro-morphology, and X-ray diffractometer (XRD) etc. The results showed that the color of corrosion products on the surface of Q235 steel by outdoor and under the shelter all gradually darkens with time, and however the darkening rate for the steel under the shelter was faster than that by outdoor exposure. The corrosion products gradually changed from FeOOH to Fe2O3 and Fe3O4.The transformation trend of the steel by outdoor exposure was slower than that under the shelter. As a result, a thick corrosion product with many cracks and pores may emerge, therefore its protectiveness for the substrate might be deteriorated, so that the corrosion rate of the steel was rose. The mass loss analysis showed that the corrosion rate for the steel by outdoor exposure was much higher than that under the shelter, and the annual average mass loss rate of the former was about 2 times of that the later. The results of electrochemical test show that the Rp of the steel by outdoor exposure is less than that under the shelter, which indicates that the corrosion tendency of the steel by outdoor exposure is greater than that under the shelter. The main reason is that the air humidity is relatively low, the sunlight is sufficient, the salt concentration is higher, and the residual salt concentration on the surface of the steel is also higher by the outdoor exposure, which leads to the deterioration of the corrosion condition.
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Received: 15 September 2022
32134.14.1005.4537.2022.286
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Corresponding Authors:
LI Bowen, E-mail: bwli@imr.ac.cn
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