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| ACCELERATION RATIOS AND DYNAMIC CORRELATION EXPERIMENTS ON THE CORROSION LOSS OF Q235 STEEL IN SEASHORE SOIL |
| NIE Xianghui1,2, LI Xiaogang3, LI Yunlong1,2, LI Jike1,2, ZHANG Hongbo1,2
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1. Tubular Goods Research Institute, China National Petroleum Corporation, Xi'an 710065
2. Beijing Longshine Oil Tubular Technology Co.Ltd., Beijing 100101
3. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083 |
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Abstract Accelerative corrosion experiments were conducted on Q235 carbon steel in seashore salt soil in order to determine acceleration ratios and dynamic correlation coefficients. The experimentation utilized constant temperature and water content, various temperatures, and different water contents to calculate mass loss of steel samples in the lab; also, samples were put in the ground one meter deep, so as to perform addition analysis in the field. The results indicated that the acceleration ratio increased when the temperature increased; in addition, at the same temperature, the acceleration ratio was largest when the water content was 10%, then progressively lessened for the 10 %~30 % water content; for the 20 % and 30 % moisture levels, the values flattened and reached a minimum. For a constant temperature, the dynamic correlation was lower for low water content accelerative experiments, and higher for moderate and high water contents. At 50℃, the correlation coefficients were higher than those at 70℃. For these experiments, 70℃ and 20 % water content, achieved optimal results of the acceleration ratio and correlation coefficients.
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Received: 23 March 2010
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Corresponding Authors:
NIE Xianghui
E-mail: niexh3597@sina.com
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