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| Effects of pH on Corrosion Behavior of Carbon Steelin Oilfield Water with High Sulphide |
| WU Xinmin1, SHAO Xiuli1, XUE Chen2, ZHANG Caixia3, FANG Fang4 |
1. Xi'an Shiyou University, Xi'an 710065, China;
2. Safety Environment Quality Supervision Department, Yanchang Oilfield Company, Yan’an 716000, China;
3. Lanzhou City College, Lanzhou 730070, China；
4. Xuguang Middle School, Wuhu 238321, China |
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Abstract The corrosion behavior of J55 carbon steel in oilfield water with high sulphide at different pH values was investigated by electrochemical measurement and dynamic corrosion mass loss method. The corrosion scales were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The results showed that depolarization in cathode of the J55 carbon steel weakened and corrosion rate decreased as pH increased. When the pH was 5.6~7.2, the corrosion scale, which was mainly composed of mackinawite (FeS1-x) with coarse grains was loose and brittle. It fell off easily and was non-protective, leading to the serious corrosion on the carbon steel surface. When the pH was 8.7~11.0, strongly protective corrosion scale which was composed of iron oxide formed on the carbon steel surface and obvious passivation was found in the anode, leading to the slight corrosion on carbon steel surface.
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