高温高盐储水罐内壁极化行为及其外加电流阴保系统辅助阳极的优化分布

Polarization Behavior of Inner Wall of Storage Tank for High Temperature and High Salt Water and Optimal Distribution of Auxiliary Anodes in Its ICCP System

通过电化学测试对高温高盐储水罐的极化特性进行了研究,获得了腐蚀电流和阴极保护电流密度的规律;对外加电流阴保系统的辅助阳极进行优化设计,通过数值模拟方法计算采用不同阳极保护方案时储水罐的阴极保护电位分布,最终确定最佳方案。结果表明:储水罐的直径为15.25 m时,综合阳极最佳的数量为8支,每支阳极覆盖的角度为45°;同时随着阳极长度的增加,储水罐电位均匀性得到改善;随着储水罐尺寸的增大,其保护电流需求量增加。

The polarization characteristics of storage tank for high temperature and high salt water were studied by electrochemical testing,and the rules of corrosion current and cathodic protection current density were obtained.The design of auxiliary anodes in the impressed current cathodic protection(ICCP)system was optimized.The cathodic protection potential distributions in the storage tank with different anode protection schemes were calculated by numerical simulation,and the optimal scheme was finally determined.The results showed that when the diameter of the water storage tank was 15.25 m,the optimal number of auxiliary anodes was 8,and the covering angle of each anode was 45°.At the same time,with the increase of the anode length,the potential uniformity was improved.With the increase of the size of the water storage tank,the demand for protection current increased.