pH值对碳钢在高含硫油田水中腐蚀行为的影响  

Effects of pH on Corrosion Behavior of Carbon Steel in Oilfield Water with High Sulphide

作　　者：吴新民[1] 邵秀丽[1] 薛晨[2] 张彩霞[3] 方芳 

机构地区：[1]西安石油大学,西安710065 [2]延长油田股份有限公司安全环保质监部,延安716000 [3]兰州城市学院,兰州730070 [4]旭光中学,芜湖238321

出　　处：《中国腐蚀与防护学报》2013年第2期159-163,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：陕西省自然科学基金项目(2001JY001);陕西省教育厅专项科研计划项目(2010JK783);陕西省科学技术研究发展计划项目(2011K17-03-11)资助

摘　　要：采用电化学测试方法和动态腐蚀失重实验并结合扫描电镜和能谱分析，研究不同pH值下J55钢在高含硫油田水中的腐蚀行为。结果表明，随着溶液pH值升高，J55钢阴极去极化作用减弱，腐蚀速率下降。当pH值在5．6—7．2时，腐蚀产物主要是疏松且易脱落的粗晶粒四方硫铁矿FeS1-x,无法在碳钢表面形成保护膜，形成大量腐蚀坑，使碳钢表面腐蚀较严重；当pH值在8．7～11．0时，腐蚀产物主要是氧化铁，在碳钢表面形成了致密的保护膜，阳极有明显的钝化现象，碳钢表面腐蚀轻微。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 （FeSl.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.

关 键 词：油田水 高含硫 腐蚀 极化曲线 

分 类 号：TG172[金属学及工艺—金属表面处理]