为提升油田开发用油管的使用服役性能,以Φ73×5.51 mm J55油管为基体,运用自蔓延高温合成技术(SHS)在Al+Fe2O3基本铝热体系中(B组分)添加质量分数为4％Nb2O5、8％ZrO2、13％CrO3、5％SiO2为新型SHS材料体系,制备了新型陶瓷内衬耐磨涂层油管(A组分).运用SEM、EDS、XRD、FTIR等分析手段测试了耐酸性腐蚀、结合强度、弯曲强度和压溃强度等性能,对比分析结果表明:A组分制备的陶瓷内衬层的耐腐蚀性、弯曲强度、结合强度及压溃强度均优于B.其中,A组分涂层和B组分涂层1200 h的流动腐蚀失重率分别为0.42％、0.54％,性能均优于J55油管基体.A组分制备的陶瓷内衬油管弯曲强度比B组分提升了 15.9％.基于滑脱位置观测,确定了 Fe-Fe界面部分冶金结合力与Fe-Al2O3界面机械结合力强弱的转换温度约为200℃,低温时机械结合力大于冶金结合力,高温时机械结合力小于冶金结合力.
Mechanical and corrosion resistance analysis of self-propagating high-temperature synthetic ceramic lined oil pipes
In order to improve the service performance of oil pipeline for oilfield development,this paper takes Φ73×5.51 mm J55 oil pipeline as the substrate,and uses self-spreading high-temperature synthesis technology(SHS)to add 4wt％Nb2O5,8wt％ZrO2,13wt％CrO3,and 5wt％SiO2 to the basic aluminum thermal system of Al+Fe2O3(B component)as a new type of SHS material system,and prepares a new type of ceramic lined wear-resistant coated oil pipe(A component).Using SEM analysis,EDS analysis,XRD analysis,FTIR analysis and other analytical means to test the acid corrosion resistance,bonding strength,bending strength and crush strength and other properties,comparative analysis results show that:the corrosion resistance,bending strength,bonding strength and crushing strength of the ceramic lining layer prepared by component A are better than that of component B.The flow corrosion weight loss rate of component A coating and component B coating at 1200 h is 0.42％and 0.54％,respectively,which is better than that of J55 tubing substrate,and the bending strength of ceramic lined tubing prepared by component A is 15.9％higher than that of component B.Based on the observation of the slip position,the transition temperature between the strength of partial metallurgical bonding at the Fe-Fe interface and the mechanical bonding at the Fe-Al2O3 interface was determined to be about 200℃,with the mechanical bonding strength being greater than the metallurgical bonding strength at low temperatures,and the mechanical bonding strength being less than the metallurgical bonding strength at high temperatures.Both the bond strength and the crush strength properties of the ceramic lining layer showed a significant decreasing trend with increasing temperature.
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