Long-term under-deposit pitting corrosion of carbon steel pipes
Long-term under-deposit pitting corrosion of carbon steel pipes
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DOI：
10.1016/j.oceaneng.2017.02.010
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发表时间：
2017-03
影响因子：
5
通讯作者：
Xiang-dong Wang;R. Melchers
中科院分区：
文献类型：
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作者：
Xiang-dong Wang;R. Melchers
在海上石油工业中，一些用于提高采油油藏产量的钢制注水管道在6点钟位置发生了严重的通道腐蚀。对现场观察的检查表明，沉积物下腐蚀（UDC）和微生物影响腐蚀（MIC）可能与这种现象有关。描述了长期的实验室实验，以区分沉积物，MIC和硝酸盐添加的存在对通道腐蚀形成的相对贡献。半管钢试件在不同的模拟试验环境中暴露365天。对点蚀形貌和点蚀深度的分析表明，MIC和沉积下腐蚀的协同作用导致了严重的局部腐蚀。硝酸盐的加入引起了最严重的局部腐蚀。极值分布检验表明，Gumbel函数不适合描述1年暴露的所有坑深数据。研究结果对工业实践中的腐蚀管理具有指导意义。
Some steel water injection pipelines used to increase the yield from oil production reservoirs in the offshore oil industry have experienced severe channelling corrosion at the 6 o′clock position. The examination of field observations suggests both under-deposit corrosion (UDC) and microbiologically influenced corrosion (MIC) are likely to be associated with the phenomenon. Long-term laboratory experiments are described to distinguish the relative contributions of the presence of deposits, MIC and nitrate addition to the formation of channelling corrosion. Half-pipe steel specimens were exposed to different simulated test environments up to 365 days. The analysis of pitting morphology and pitting depth shows the synergistic effect of MIC and under-deposit corrosion led to severe localized corrosion. Nitrate addition caused most severe localized corrosion. Extreme value distribution examination shows Gumbel function is not appropriate to describe all the pit depth data for 1 year exposure. The results have implications for the corrosion management in industrial practice.