ABSTRACT

Cathodic protection is a well-known technique to control corrosion of buried structures, even in the presence of a grounding system. In fact, without cathodic protection, the grounded carbon steel structure is subject to galvanic corrosion due to the coupling with Cu wires or rods, being the latter more noble than carbon steel. In the present study, different scenarios have been modelled by finite element method (FEM), to study the effect of coating defects, high and low protection current densities and different soil resistivity on cathodic protection condition. The simulations highlight the paramount importance of two parameters: the definition of a minimum total protection current (pipe and grounding) to ensure a proper protection level and the soil resistivity.

摘要

阴极保护是一种众所周知的控制埋地结构腐蚀的技术，即使在存在接地系统的情况下也是如此。事实上，在没有阴极保护的情况下，接地的碳钢结构由于与铜线或铜棒的耦合而受到电偶腐蚀，后者比碳钢更贵重。在本研究中，通过有限元法（FEM）模拟了不同的场景，研究了涂层缺陷、高低保护电流密度和不同土壤电阻率对阴极保护条件的影响。模拟强调了两个参数的重要性：定义最小总保护电流（管道和接地）以确保适当的保护水平和土壤电阻率。