【摘要】 传统的有限元阴极保护模拟分析忽略了阳极表面电流密度的变化规律和阴极电位随时间的动态变化过程。针对平潭海峡防撞浮筒腐蚀防护10 a寿命设计方案进行了有限元分析,探讨了在稳态和瞬态条件下浮筒的表面电位变化及服役寿命,验证了阳极电流密度和阴极电极电位与腐蚀速率之间的关系。结果表明:现有的阴极保护满足不了10 a寿命的防护要求,通过牺牲阳极方案调整优化,有效地降低了浮筒背脊表面电位和阳极腐蚀电流密度,提高了浮筒服役年限,服役寿命可达12 a;在阳极表面,电流密度呈现网格状扩张,棱角处电流密度最大。通过仿真分析优化了实际工程中的防护效果,为工程应用提供了理论基础。更多还原

【Abstract】 The traditional finite element simulation analysis of the cathodic protection always ignores the variation of the current density on the anode surface and the dynamic change of the cathodic potential over time. In this paper,the 10-year life design scheme for anti-collision float corrosion protection of Pingtan Strait was analyzed by finite element analysis,and the surface potential variation and service life of the float under steady state and transient conditions were explored and discussed. The relationships between anode current density,cathode electrode potential and the corrosion rate were verified. Results showed that the present cathodic protection could not meet the protection requirements for 10-year life. After sacrificing anode optimization scheme,the surface potential of float back and the corrosion current density were effectively reduced,and the service life of float was improved to 12 a. Furthermore,the current density exhibited a grid expansion on the surface of the anode,and the current density at the angle reached the maximum. Through simulation analysis,the protection effect in practical engineering was optimized,which could provide a theoretical basis for engineering application.更多还原