模拟海水管路的电偶效应数值仿真研究

目的 研究钛合金模拟海水管路与船体间在不同电连接方式下的电位以及腐蚀电流密度分布,明确防腐措施.方法 针对钛合金模拟海水管路与船体结构,基于有限元建立仿真模型,开展两者的电偶效应数值仿真计算,重点研究两者电连接状态、接触界面绝缘状态和所有结构体单元绝缘状态的电位和电流密度分布情况.结果 在船体钢与钛合金管路系统电连接时...

Numerical Simulation Research on Galvanic Effect of Simulating Seawater Pipeline

This paper aims to study the potential and corrosion current density distribution between the titanium alloy simulated seawater pipeline and the ship hull under different electrical connections and clarify the anti-corrosion measures. Aiming at the titanium alloy simulating seawater pipeline and hull structure, a simulation model was established based on finite element to carry out the numerical simulation calculation of the galvanic effect of the two, focusing on the electrical connection state of the titanium alloy simulating seawater pipeline and hull structure, the insulation state of the contact interface, and the potential of the insulation state of all structural units. The distribution of current density and current density play a guiding role in suppressing galvanic corrosion in actual projects. The simulation results show that when the hull steel is electrically connected to the titanium alloy pipeline system, the hull steel is in a state of accelerated corrosion, and the corrosion at the interface with the seawater pipeline is the most serious, while the seawater pipeline is in a cathodic protection state. When the seawater pipeline structure is insulated from the hull structure, both the hull and seawater pipeline appear to be self-corrosive, and there is no galvanic corrosion between the two systems. When the seawater pipeline structure is insulated from the hull structure and the seawater pipeline and the units are also insulated, each unit of the ship''s hull and pipeline seawater piping is in a self-corrosive state, and there is no galvanic corrosion between the two systems and between the seawater pipeline units. The electrical connection of titanium alloy piping and hull steel will cause galvanic corrosion of hull steel, especially at the interface between the two, where the corrosion is the most serious. The insulation treatment between dissimilar metals can prevent the occurrence of galvanic corrosion, and only needs to insulate the dissimilar metals, and there is no need to insulate the structures of the same material.