三层PE覆盖层系统是近几年由美国、欧洲开发的新型防腐涂料 ,目前倍受国际管道界的重视 ,现已越来越多地应用于油、气、水金属管道的防腐工程上。这种防腐涂料以三合一的方式将三层涂料熔融为一体 ,使它补充相互的不足 ,并充分地发挥了良好的粘结力和机械保护作用 ,从而达到最佳的防腐效果。本文以三层结构的环氧树脂底漆层、聚合物中间层和聚乙烯表层为重点 ,详细地介绍了三层涂料的性能、涂敷程序、试验结果 ,以及三种涂层在各种温度条件下的优良性能 ,同时介绍了三层涂层管在复杂山区环境中的应用实例和所获得的经济效益 The three-layer PE covering system is a new type of anti-corrosion coating developed by the United States and Europe in recent years. At present, it has drawn much attention from the international pipeline industry and has been increasingly applied to the anti-corrosion engineering of oil, gas and water metal pipes. This anti-corrosion coating in three-in-one way to melt three-in-one paint, making it complement each other’s deficiencies, and give full play to the good adhesion and mechanical protection, so as to achieve the best anti-corrosion effect. In this paper, three-layer structure of the epoxy primer layer, the polymer layer and the polyethylene surface as the focus, describes in detail the three-layer coating performance, coating procedures, test results, and three coatings at various temperatures Under the conditions of the excellent performance, at the same time introduced the three-coated tube in the application of complex mountain environment and the economic benefits obtained