一、引言按照上海市黄浦江上游引水工程的初步设计,几处过江的A_3钢管外壁防腐蚀涂料拟在两个品种中选择:(1)环氧涂料:702环氧富锌底漆加842云铁环氧漆;(2)氯磺化聚乙烯。这两种涂料都是近年国内新发展的品种,前者主要用于船舶,后者主要用于化工大气,它们耐土壤腐蚀的数据都还不多。为了快速评价涂层的耐腐蚀性能,腐蚀电化学测试是比较切实可行的方法。尤其是发展不久的交流阻抗技术,已在评价涂层性 I. INTRODUCTION According to the preliminary design of the Huangpu River upstream diversion project in Shanghai, several anticorrosive coatings of A_3 steel pipe wall are selected to be selected from two varieties: (1) epoxy paint: 702 epoxy zinc-rich primer plus 842 Cloud iron epoxy paint; (2) chlorosulfonated polyethylene. Both of these coatings are newly developed varieties in recent years in China. The former is mainly used in ships and the latter is mainly used in the chemical atmosphere, and their data on soil erosion resistance are scarce. In order to quickly evaluate the corrosion resistance of coatings, electrochemical corrosion testing is a more practical method. In particular, the development of AC impedance technology, has been evaluated coating