原油储罐的泄漏点多出现在储罐底部，目前常规防腐蚀措施是选用防腐蚀性能较好的涂料，提高罐底的耐硫离子腐蚀能力。针对某企业近年来储罐硫腐蚀的实际情况，对Q235钢板选取4种耐腐蚀涂料体系,对涂层钢进行了力学性能、电化学阻抗试验。利用交流阻抗法研究了涂层钢在Na2S溶液中的电化学行为，试验结果表明，所选用的3种防腐蚀涂料均优于该企业正在使用的防腐蚀涂料，力学性能较好，低频阻抗值较高，且具有阴极保护作用的涂料体系对金属基体有更好的保护作用。

Leak of oil storage tanks most appears on the bottom of the tank. In order to improve the corrosion resistance of the tank bottom in sulfur environment, selecting good anticorrosion coatings is a conventional anti-corrosion measure. In recent years, actually due to the sulfur content of crude oil being increased in some enterprises, the mechanical properties and electrochemical impedance spectroscopy of four kinds of anticorrosive coating systems were tested. The electrochemical behavior of Q235 carbon steel in Na2S solution was studied by electrochemical impedance spectroscopy. The results showed that three kinds of anti-corrosion coatings are better than the coating system that is currently being used. Coatings with better mechanical properties, higher impedance values and cathodic protection function have a better protective effect on the metal.