镍钨合金镀层对QT-900油管耐CO_2腐蚀的影响  

Effect of Ni-W Alloy Coating on the Corrosion Resistance of QT-900 Coiled Tubing

作　　者：孙福洋 赵国仙[1] 郭清超[2] 李丹平[3] 

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]河北工业大学材料科学与工程学院,天津300131 [3]西安摩尔石油工程实验室有限公司,西安710065

出　　处：《表面技术》2014年第6期6-10,15,共6页Surface Technology

基　　金：国家自然科学基金资助项目(51271146)~~

摘　　要：目的对镍钨合金镀层在连续油管上的应用进行初步探索。方法通过直流电沉积法,在QT-900连续油管表面沉积镍钨合金层。模拟某油田腐蚀环境,通过高温高压腐蚀实验,采用金相显微镜、SEM和EDS等分析手段,对比镀镍钨合金连续油管和普通连续油管的耐蚀性能,研究在CO2介质中镍钨合金镀层对油管耐蚀性的影响。结果镍钨合金镀层中主要含Ni和W元素,Fe和Mn元素含量较少,镀层平均厚度在55μm左右。在温度60℃,CO2分压1.07 MPa,拉应力439 MPa的条件下,镍钨合金镀层的平均腐蚀速率为0.0160 mm/a,约为普通连续油管的1/40,属于轻度腐蚀。结论镍钨合金镀层具有良好的耐CO2腐蚀性能。Objective To preliminarily explore the application of Ni-W alloy coating in QT-900 coiled tubing. Methods Ni-W alloy coating was deposited on the surface of QT-900 coiled tubing by DC electrodeposition. An oilfield corrosion environment was simulated by high temperature and high pressure corrosion tests. The effect of Ni-W alloy coating on coiled tubing was studied by comparing the corrosion resistance of Ni-W alloy coating and coiled tubing using analysis methods such as microscopy, SEM and EDS. The effect of Ni-W alloy coating on the corrosion resistance of oil tubing in CO2 medium was studied. Results Ni-W alloy coating mainly consisted of Ni and W elements, and the Fe and Mn contents were low. The average thickness of the coating was 55μm. The uniform corrosion rate of Ni-W alloy coating was 0. 0160 mm/a at 60℃ with a CO2 partial pressure of 1.07 MPa and a tensile stress of 439 MPa, which was 1/40 of that of the ordinary coiled tubing. The corrosion rate belonged to slight corrosion, Conclusion Ni-W alloy coating had a good resistance to CO： corrosion.

关 键 词：镍钨合金镀层 QT-900连续油管 耐蚀性 

分 类 号：TG172.8[金属学及工艺—金属表面处理] TQ153.2[金属学及工艺—金属学]