钢管3PE外防腐多层聚烯烃涂敷新工艺介绍

A Newly Approach of 3PE Pipe Coating-multi-layer Polyolefin Coating

介绍了常规的钢管3PE外防腐工艺及其优缺点及目前国内外为提高钢管3PE外防腐质量所采取的有效措施。重点介绍了一种由环氧粉末喷涂、胶粘剂粉末喷涂、聚烯烃粉末喷涂和聚烯烃挤出缠绕组成的多层聚烯烃涂敷新工艺。该方法能减少钢管焊道上的涂层减薄,并能消除焊顶、焊脚处出现的空穴,显著减小涂层内的残余应力,从而提高3PE钢管外防腐质量。

This paper presents a detailed introduetion about the advantages and disadvantages of conventional 3PE external coating, and the effective measures which are taken by manufactured at home and the abroad to improve 3PE external coating quality. A newly coating approach consisting of epoxy powder spraying, adhesive powder spraying, and polyolefin powder spraying as well as extruded polyolefin wrapping was introduced. This newly coating approach can avoid the weld coating thickness reducing thin,eliminate cavities appeared on the top and foot of welding, and significantly reduce residual stresses in the coating,so it can remarkably improve 3PE external coating quality.