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介绍了高速公路护栏杆和锥形电杆用涂塑钢管的优点及涂塑工艺。提出：涂覆前的预处理先进行化学除油，再进行酸洗去锈，最后进行磷化处理；采用流动槽涂覆法生产；由于锥形路灯电杆上细下粗，因而涂覆前因在等温加热的基础上用重熔枪适当烘烤锥形杆的细径部位，这样就可达到涂层厚度均匀。通过与其它涂覆法比较，流动槽涂覆法生产周期短，涂层厚，使用寿命长，无污染，值得推广应用。
The advantages of plastic coated steel pipe for highway guard rail and conical pole are introduced. It is proposed that the pre-coating pretreatment should be carried out first by chemical degreasing, pickling and then rust removal, and finally phosphating; the production by the flow tank coating method; since the tapered street lamp poles are thin and rough before coating Due to the isothermal heating on the basis of the remelting gun appropriate bake taper rod diameter parts, so that you can achieve uniform coating thickness. Compared with other coating methods, the flow cell coating method has the advantages of short production cycle, thick coating, long service life and no pollution, which is worthy of promotion and application.