管线是输送原油和天然气的主要手段,总希望一旦敷设,能使用数十年以上,因而防蚀就成了最主要的问题。传统的方法是在管外涂沥青或煤焦油,虽然价廉,效果却不好。美国研究出管外涂环氧树脂法,收到 Pipeline is the main means of transporting crude oil and natural gas, always hope once laying, can be used for more than a decade, so corrosion has become the most important issue. The traditional method is to apply bitumen or coal tar outside the tube, although inexpensive, the effect is not good. The United States developed a tube coated with epoxy resin method, received