用电位分布数学模型评价罐底阴极保护效果

地面金属储罐底极阴极保护技术中关键问题之一是判断罐底，特别是罐底中心的保护效果，目前缺少经济和简便的测量罐底保护电位的方法，电位分布数学模型为研究罐底保护提供了一种解决途径。根据稳流电场理论推导并试验验证了罐底阴极保护电位分布的数学模型，发现罐底保护电位和距罐底中心比率距离成类似立方抛物线方程形式。根据这个模型讨论罐底电位分布规律，提出罐周电位检测及一点法、二点法、多点法等电位检测技术用于评价阳极

Judgment of Cathodic Protection Effectiveness on Tank Bottom by Potential Distribution Modeling

One of the key problems in cathodic protection of tank bottoms is the judgment of protection effectiveness on whole tank bottoms,especially the protection effectiveness of bottom's center. For lack of simple and economical methods to measure the bottom's potential,the potential distribution modeling is an important approach to the study the bottom's protection. According to the theory of stable current electrical field, the mathematical modeling of potential distribution on bottoms had been already derived and confirmed by author's lab. It was found that the protection potential was a function of the ratio distance in. form of cubic parabolic-like curve. In present paper the measurement of protection potential and the judgment of protection effectiveness were proposed, namely,in one-point method, two-points method, multi-points method and circumference-potential method and so on. These methods could be used to evaluate the effect of anodic field and to predict the potential of bottom's center easily without needs of full gauge PVC measurement tube buried under tank bottom. It was shown by some examples' analysis that the accuracy of these methods could fit into the request of daily inspection.