工程科学学报，第41卷，第5期：625-632,2019年5月 Chinese Joural of Engineering,Vol.41,No.5:625-632,May 2019 D0L:10.13374/j.issn2095-9389.2019.05.009:htp:/journals.usth.edu.cm 高温高压环境下不同浓度KBr溶液对13Cr不锈钢的 腐蚀行为影响 朱金阳)☒，郑子易2)，许立宁2)，路民旭2) 1)北京科技大学国家材料服役安全科学中心，北京1000832)北京科技大学新材料技术研究院，北京100083 ☒通信作者，E-mail:zhujinyang(@usth.cdu.cn 摘要油气工业中溴盐完井液的使用极易导致油套管腐蚀失效的发生，尤其是局部腐蚀风险。针对这一问题，采用高温高 压腐蚀模拟试验、扫描电镜观察与分析、电化学测试等试验研究方法，研究了高温高压环境下不同浓度溴盐溶液对普通13C 和超级13Cr两种典型油套管材腐蚀行为的影啊.结果表明：从平均腐蚀速率来看，两种13C管材在三种浓度溴盐溶液中均 表现出较好的耐蚀性能，属于轻度或中度腐蚀，但从局部腐蚀速率来看，两种材料均达到严重或极严重腐蚀：随着溴盐浓度的 提高，普通13C的自腐蚀电位和点蚀电位均明显负移，对应材料的平均腐蚀速率和局部腐蚀速率均明显上升，而超级13Cr仅 点蚀电位明显负移，自腐蚀电位则相对稳定，对应其平均腐蚀速率变化幅度较小，局部腐蚀速率则明显上升，这说明相比普通 13Cr,超级13C对溴盐溶液具有更强的整体耐受能力，但局部腐蚀敏感性仍然较高：激光共聚焦(LSCM)三维表征结果表明， 在高质量浓度溴盐溶液(1.40g·cm3)中，不论是普通13Cr还是超级13Cr都有明显的点蚀倾向，这主要与溶液中高浓度的侵 蚀性阴离子Br"有关，相比于普通13Cr,超级13C的点蚀敏感性相对较低，但其点蚀风险仍不可忽视. 关键词13C油套管：溴盐完井液：高温高压：点蚀：动电位极化 分类号TG174.2 Influence of KBr concentration on corrosion behaviors of 13Cr stainless steels under high temperature and high pressure ZHU Jin-yang,ZHENG Zi-yi,XU Li-ning?,LU Min-xu) 1)National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China 2)Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:zhujinyang@ustb.edu.cn ABSTRACT Recently,the use of bromine completion fluids in the oil and gas industry has caused numerous severe corrosion prob- lems of the oil well casing and tubing,particularly the localized corrosion failure.Bromine completion fluids,such as KBr solution,are highly corrosive to steels.Even if the stainless steel is subjected to a high concentration of bromate under high temperature and pres- sure,it can still experience severe corrosion failure risks.In this study,the influence of KBr concentrations on corrosion behaviors of plain and super 13Cr steels under high temperature and pressure was investigated by corrosion simulation,scanning electron microscopy (SEM)observation,and electrochemical measurements.The results show that both plain and super 13Cr steels exhibit good corrosion resistance in KBr solutions with various concentrations regarding average corrosion rate,which is either mild or moderate.However,the local corrosion rates of plain and super 13Cr steels are serious or extremely serious.With the increase of bromide concentration,the free corrosion and pitting potentials of plain 13Cr steel significantly decrease.Both the average and local corrosion rates increase signifi- cantly.For super 13Cr steel,the pitting potential decreases,whereas the free potential remains relatively stable.The average corrosion 收稿日期：2018-12-24 基金项目：国家自然科学基金资助项目(51871025)工程科学学报,第 41 卷,第 5 期:625鄄鄄632,2019 年 5 月 Chinese Journal of Engineering, Vol. 41, No. 5: 625鄄鄄632, May 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 05. 009; http: / / journals. ustb. edu. cn 高温高压环境下不同浓度 KBr 溶液对 13Cr 不锈钢的 腐蚀行为影响 朱金阳1)苣 , 郑子易2) , 许立宁2) , 路民旭2) 1) 北京科技大学国家材料服役安全科学中心, 北京 100083 2) 北京科技大学新材料技术研究院, 北京 100083 苣通信作者, E鄄mail: zhujinyang@ ustb. edu. cn 摘 要 油气工业中溴盐完井液的使用极易导致油套管腐蚀失效的发生,尤其是局部腐蚀风险. 针对这一问题,采用高温高 压腐蚀模拟试验、扫描电镜观察与分析、电化学测试等试验研究方法,研究了高温高压环境下不同浓度溴盐溶液对普通 13Cr 和超级 13Cr 两种典型油套管材腐蚀行为的影响. 结果表明:从平均腐蚀速率来看,两种 13Cr 管材在三种浓度溴盐溶液中均 表现出较好的耐蚀性能,属于轻度或中度腐蚀,但从局部腐蚀速率来看,两种材料均达到严重或极严重腐蚀;随着溴盐浓度的 提高,普通 13Cr 的自腐蚀电位和点蚀电位均明显负移,对应材料的平均腐蚀速率和局部腐蚀速率均明显上升,而超级 13Cr 仅 点蚀电位明显负移,自腐蚀电位则相对稳定,对应其平均腐蚀速率变化幅度较小,局部腐蚀速率则明显上升,这说明相比普通 13Cr,超级 13Cr 对溴盐溶液具有更强的整体耐受能力,但局部腐蚀敏感性仍然较高;激光共聚焦(LSCM)三维表征结果表明, 在高质量浓度溴盐溶液(1郾 40 g·cm - 3 )中,不论是普通 13Cr 还是超级 13Cr 都有明显的点蚀倾向,这主要与溶液中高浓度的侵 蚀性阴离子 Br - 有关,相比于普通 13Cr,超级 13Cr 的点蚀敏感性相对较低,但其点蚀风险仍不可忽视. 关键词 13Cr 油套管; 溴盐完井液; 高温高压; 点蚀; 动电位极化 分类号 TG174郾 2 收稿日期: 2018鄄鄄12鄄鄄24 基金项目: 国家自然科学基金资助项目(51871025) Influence of KBr concentration on corrosion behaviors of 13Cr stainless steels under high temperature and high pressure ZHU Jin鄄yang 1)苣 , ZHENG Zi鄄yi 2) , XU Li鄄ning 2) , LU Min鄄xu 2) 1) National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China 2) Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 苣Corresponding author, E鄄mail: zhujinyang@ ustb. edu. cn ABSTRACT Recently, the use of bromine completion fluids in the oil and gas industry has caused numerous severe corrosion prob鄄 lems of the oil well casing and tubing, particularly the localized corrosion failure. Bromine completion fluids, such as KBr solution, are highly corrosive to steels. Even if the stainless steel is subjected to a high concentration of bromate under high temperature and pres鄄 sure, it can still experience severe corrosion failure risks. In this study, the influence of KBr concentrations on corrosion behaviors of plain and super 13Cr steels under high temperature and pressure was investigated by corrosion simulation, scanning electron microscopy (SEM) observation, and electrochemical measurements. The results show that both plain and super 13Cr steels exhibit good corrosion resistance in KBr solutions with various concentrations regarding average corrosion rate, which is either mild or moderate. However, the local corrosion rates of plain and super 13Cr steels are serious or extremely serious. With the increase of bromide concentration, the free corrosion and pitting potentials of plain 13Cr steel significantly decrease. Both the average and local corrosion rates increase signifi鄄 cantly. For super 13Cr steel, the pitting potential decreases, whereas the free potential remains relatively stable. The average corrosion