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DOI:
钛工业进展:2020,37(5):27-30
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钛焊管表面黑斑成因分析及控制
Analysis and Control of Black Spots on the Surface of Titanium Welded Tube
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中文摘要: 在钛焊管的生产过程中,部分钛焊管表面出现了形状不规则的黑斑,不仅降低了成材率,而且增加了生产成本。为找出黑斑形成原因,采用扫描电镜及能谱仪、拉曼光谱仪、金相显微镜对黑斑区域进行了表征和分析。结果表明:黑斑区域碳含量较高,且拉曼图谱有锐利的D峰和G峰,为表面附着的碳化物。结合生产过程认为,黑斑是由于生产线运动部件处的润滑脂混入乳化液后,被乳化液带到钛焊管表面,在高温退火时碳化形成的。通过控制运动部件的润滑脂用量、增加清理溢出润滑脂的频率、给乳化液设置过滤装置和增大清洗水的压力等措施,有效解决了钛焊管表面的黑斑问题。
中文关键词: 钛焊管  黑斑  碳化物  润滑脂
Abstract:In the manufacturing process of titanium welded tube,irregular black spots appeared on the surface of some titanium welded tube,which not only reduced the yield,but also increased the production cost. In order to find out the cause of black spot formation,the black spot area was characterized and analyzed by SEM,EDS,Raman spectrometer and metallographic microscope. The results show that the carbon content in the black spot is high,and there are sharp D & G peaks in the Raman spectrum,which are carbides attached to the surface. Combined with the manufacturing process,it is considered that the black spot is caused by the grease mixed with the emulsion at the moving parts of the production line,which is carried to the surface of the titanium welded tube by the emulsion and carbonized during high temperature annealing. By controlling the amount of grease used in the moving parts,increasing the frequency of cleaning the spilled grease,setting up a filtering device for emulsion and increasing the pressure of cleaning water,the black spot problem on the surface of titanium welded tube is effectively solved.
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