X80管线钢内壁旋杯喷涂涂层厚度均匀性研究

Study on the Uniformity of Coating Thickness Sprayed by Rotating Cup on the Inner of X80 Pipeline Steel

石油天然气多采用管道进行输送,管道内壁的腐蚀是其主要失效形式,对管道内壁添加涂层可以提高管道耐腐蚀性能。对X80管线钢内壁高速旋杯离心喷涂开展工艺实验,研究了喷涂关键参数包括旋杯转速、行进速度、旋杯外径、喷涂压力对涂层平均厚度及涂层均匀性的影响规律和原因。而后对喷涂工艺参数进行系统性优化,得到最佳的工艺参数组合。实验结果表明,涂层平均厚度主要由旋杯转速、喷涂压力、行进速度以及旋杯外径决定,涂层的均匀性主要由旋杯转速以及喷涂压力决定。当旋杯转速为25000r/min、喷涂压力为0.2MPa、行进速度为0.9m/min、旋杯外径为32mm时,涂层均匀性最佳,涂层的平均厚度为450.3μm,涂层厚度标准差值为3.3μm。

Oil and gas are mostly transported by pipeline,and the corrosion of pipeline inner wall is the main form of failure.Add-ing coating on pipeline inner wall can improve the corrosion resistance of the pipeline.The centrifugal spraying process of X80 pipeline steel inner wall with high-speed rotating cup was carried out.The influence of the key parameters including rotating speed,traveling speed,diameter of rotating cup and feeding pressure on the average thickness and uniformity of coating was stud-ied.Then the spray process parameters were optimized systematically to get the best combination of process parameters.The experi-mental results show that the average thickness of the coating was mainly determined by the rotating speed,feeding pressure,trav-eling speed and outer diameter of the rotating cup.And the uniformity of the coating is mainly determined by the rotating speed and feeding pressure of the rotating cup.When the speed of the rotating cup is 25000r/min,the spraying pressure is 0.2MPa,the moving speed is 0.9m/min,and the outer diameter of the rotating cup is 32mm,the average thickness of the coating is 450.3µm,and the standard difference of the coating thickness is 3.3,the coating with the best uniformity is obtained.The average thickness of the coating is 450.3µm,and the standard deviation of the coating thickness is 3.3µm.