余晓毅,常炜,胡丽华,张雷,路民旭.海底管道腐蚀产物对缓蚀剂效率的影响[J].表面技术,2016,45(5):62-66.
YU Xiao-yi,CHANG Wei,HU Li-hua,ZHANG Lei,LU Min-xu.Influence of Corrosion Scales on the Corrosion Inhibitor Efficiency in Submarine Pipelines[J].Surface Technology,2016,45(5):62-66
海底管道腐蚀产物对缓蚀剂效率的影响
Influence of Corrosion Scales on the Corrosion Inhibitor Efficiency in Submarine Pipelines
投稿时间:2016-01-11  修订日期:2016-05-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.05.009
中文关键词:  腐蚀产物  缓蚀剂  海底管道  缓蚀剂效率  CO2腐蚀  碳钢
英文关键词:corrosion scales  corrosion inhibitor  submarine pipeline  inhibition efficiency  CO2 corrosion  carbon steel
基金项目:
作者单位
余晓毅 中海油研究总院,北京 100026 
常炜 中海油研究总院,北京 100026 
胡丽华 中海油研究总院,北京 100026 
张雷 北京科技大学,北京 100083 
路民旭 北京科技大学,北京 100083 
AuthorInstitution
YU Xiao-yi CNOOC Research Institute, Beijing 100026, China 
CHANG Wei CNOOC Research Institute, Beijing 100026, China 
HU Li-hua CNOOC Research Institute, Beijing 100026, China 
ZHANG Lei University of Science and Technology Beijing, Beijing 100083, China 
LU Min-xu University of Science and Technology Beijing, Beijing 100083, China 
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中文摘要:
      目的 研究海底管道中的腐蚀产物对缓蚀剂效率的影响,对海底管道运行过程中缓蚀剂的使用提出建议。 方法 采用高温高压反应釜模拟现场作业条件进行 CO2 腐蚀实验,采用失重法测定海底管道钢试片的全面腐蚀速率,采用扫描电子显微镜观测试片微观表面形貌,实验评价已发生腐蚀试片和清除腐蚀产物试片的全面腐蚀速率和缓蚀剂效率。 结果 在经过 CO2预腐蚀并覆盖腐蚀产物膜后,高效缓蚀剂 H 的缓蚀效率为 75%,低于直接作用于裸钢时的缓蚀效率 90%。清除腐蚀产物后,缓蚀剂 H 的效率为 80%,比未清除前的缓蚀效率有所提高,低于常用的缓蚀剂效率设计值 85%,且试片的全面腐蚀速率有所降低。 结论 在海底管道投产后,应避免初期缓蚀剂加注不当或不足发生的 CO2腐蚀,如果通过铁离子含量检测等方法已检测发生比较严重的 CO2 腐蚀,应及时采取清管和后续预膜措施,必要时应及时调整缓蚀剂加注剂量或缓蚀剂类型。
英文摘要:
      Objective To study the influence of corrosion scales on the corrosion inhibitor efficiency in submarine pipelines, and to give suggestions for the usage of corrosion inhibitors during the operation of submarine pipelines. Methods With a high-temperature and high-pressure reaction vessel simulating the operation condition on site, the corrosion rates of submarine pipeline steel coupons were measured using weight loss method, and the micro-morphology of the test specimen was observed via scanning electron microscopy. The general corrosion rate and inhibition efficiency on both the eroded specimens and the specimens that were eroded but the corrosion scales were erased, were evaluated according to the test results. Results When the test specimen was pre-eroded by CO2 and covered by corrosion-scales, the inhibition efficiency of the high-efficiency corrosion inhibitor H was 75%, which was lower than its inhibition efficiency on the bare steel, i.e. 90%. After corrosion scales were removed, the inhibition efficiency of inhibitor H was 80%, which was higher than the inhibition efficiency on un-cleaned eroded specimen, but still lower than the inhibition efficiency on the bare steel, and also lower than the common design value of inhibition efficiency, i.e. 85%. After corrosion scales were removed, the general corrosion rate of test specimens decreased. Conclusion After submarine pipelines were applied, the CO2 corrosion caused by the incorrect or insufficient usage of corrosion inhibitors should be avoided. If significant CO2 corrosion was detected by testing iron ion content, the measures of pigging and pre-filming should be taken, and the type and amount of corrosion inhibitors should be adjusted.
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