钛合金在高温盐酸中腐蚀行为研究  

Study on Corrosive Behavior of Titanium Alloy in High Temperature Hydrochloric Acid

作　　者：何石磊 骆鸿[3] 董超 苑清英 王涛 李远征[1,2] 王旭 胡绍东[2] 刘和平 HE Shilei;LUO Hong;DONG Chao;YUAN Qingying;WANG Tao;LI Yuanzheng;WANG Xu;HU Shaodong;LIU Heping(Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008,Shaanxi,China;Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Institute for Advanced Materials and Technology of the University of Science and Technology Beijing,Beijing 100083,China;Xi’an OCTG Company of BSG Group,Xi’an 710000,China)

机构地区：[1]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [2]宝鸡石油钢管有限责任公司,陕西宝鸡721008 [3]北京科技大学新材料技术研究院,北京100083 [4]宝鸡钢管西安石油专用管公司,西安710000

出　　处：《焊管》2021年第9期1-6,共6页Welded Pipe and Tube

基　　金：中国石油科技创新基金研究项目“高强度、低密度、抗腐蚀钛合金油井管设计和服役研究”(项目编号2019D-5007-0308)。

摘　　要：针对钛合金油管在高温还原性酸盐酸环境中适用性,分别开展了160℃不同浓度盐酸、不同温度的20%盐酸+有机酸、不同温度酸化用胶凝酸的三种不同环境下的失重试验,利用SEM、EDS等工具分析了腐蚀形貌和腐蚀产物,研究了钛合金油管在高温还原性酸盐酸环境中腐蚀/性能及适用性。结果显示,在160℃高温的7%~20%HCl溶液、90~160℃的20%HCl+5%C2H4O2溶液及酸化用胶凝酸鲜酸中,随着盐酸浓度的增加、试验温度的升高,腐蚀速率不断增大,甚至管材发生溶解;添加适当比例的Na2MoO4类缓蚀剂,可在120℃及以下温度的20%HCl+5%C2H4O2溶液、酸化用胶凝酸鲜酸溶液中有效降低钛合金管材腐蚀速率,可实现腐蚀速率降低98%以上,而160℃下未能有效起保护作用。因此,建议今后研发适应钛合金120℃以上温度的新型高温抗酸化缓蚀剂。In terms of the applicability of titanium alloy tubing in high-temperature hydrochloric acid environments,the weight loss experiment in different concentrations of hydrochloric acid at 160℃,20%hydrochloric acid with organic acid under different temperatures and gelling acids for acidification at different temperatures were carried out.The corrosion morphology and products of titanium alloy tubing were analyzed to study the corrosion performance and applicability in high-temperature reducing hydrochloric acid environments by Scanning Electron Microscope(SEM),Energy Dispersive Spectroscopy(EDS)etc.The results show that in 7%~20%HCl solution at 160℃,20%HCl+5%C2H4O2 solution at 90~160℃and fresh acid of gelling acid for acidification,the corrosion rate increases with the increase of hydrochloric acid concentration and test temperature,and even dissolution occurs.By adding corrosion inhibitor,the tests result show that adding appropriate proportion of Na2MoO4 type corrosion inhibitor can effectively reduce the corrosion rate of titanium alloy tubing in 20%HCl+5%C2H4O2 solution at 120℃and below and under gelling acid for acidification.The corrosion rate can be reduced by more than 98%,but the protection is not effective at 160℃.Therefore,it is recommended to develop a new type of high-temperature anti-acidification corrosion inhibitor suitable for titanium alloys above 120℃.

关 键 词：钛合金油管 缓蚀剂 胶凝酸 腐蚀速率 

分 类 号：TG172.6[金属学及工艺—金属表面处理]