摘要
油田开发过程中,高矿化度的采出水对管线设备腐蚀严重。非晶Ni-W镀层具有良好的耐蚀性,在管道连接件表面电镀非晶Ni-W镀层,可以提高连接件的耐蚀性能。通过浸泡法和电化学方法研究了非晶Ni-W镀层及L245钢在含硫NaCl溶液中的腐蚀行为。采用扫描电镜(SEM)、能谱(EDS)、X射线衍射仪(XRD)分析了Ni-W镀层与L245钢表面形貌、成分和结构,并通过电化学测试对比分析非晶Ni-W镀层与L245钢的腐蚀原理。结果表明:硫离子会加速基体L245钢的腐蚀,非晶Ni-W镀层可以有效提高L245钢在含硫NaCl溶液中的耐蚀性能;硫离子浓度为0.0010 mol/L时,非晶Ni-W镀层表面形成钝化膜,使腐蚀减缓;硫离子浓度为0.0050 mol/L时,Cl^(-)和S^(2-)协同作用,在非晶Ni-W镀层表面发生点蚀。
During the development of oilfield,the produced water with high salinity is seriously corroded to pipeline equipment.Owing to the good corrosion resistance,amorphous Ni-W coating applied on the surface of the pipeline connector can improve the anti-corrosion performance of connector.In this work,the corrosion behaviors of amorphous Ni-W coating and L245 steel in sulfur-containing NaCl solution were studied through immersion and electrochemical methods.Additionally,the surface morphology,composition,and structure of Ni-W coating and L245 steel were analyzed by scanning electron microscope(SEM),energy spectrum(EDS)and X-ray diffractometer(XRD),and the corrosion principles of amorphous Ni-W coating and L245 steel were studied through electrochemical tests.Results showed that sulfide ions would accelerate the corrosion of the L245 steel,and the amorphous Ni-W coating could effectively improve the corrosion resistance of L245 steel in the sulfur-containing NaCl solution.When the sulfide ion concentration was 0.0010 mol/L,a passivation film formed on the surface of amorphous Ni-W coating,which slowed down the corrosion.When the sulfide ion concentration was 0.0050 mol/L,Cl^(-) and S^(2-) could work together,resulting in a pitting corrosion on the surface of the amorphous Ni-W coating.
作者
曹卜元
李荣
任尚远
王苗
曹家豪
CAO Bo-yuan;LI Rong;REN Shang-yuan;WANG Miao;CAO Jia-hao(Western BaoDe Technologies Co.,Ltd.,Xi'an 710201,China;School of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065,China)
出处
《材料保护》
CAS
CSCD
2022年第6期18-27,33,共11页
Materials Protection
