Study On Numerical Simulation Application Of Sacrificial Anode Cathodic Protection Of Shipwreck

The discovery of the ruins of the shipwreck has once again unveiled the tragic history of the Sino-Japanese War of Sino-Japanese War.In order to preserve this precious historical memory and encourage future generations to work hard,reasonable measures need to be taken to protect the ruins of the shipwreck of the Jing-yuan ship and prevent secondary damage to the ruins due to seawater corrosion.In the protection of metal shipwrecks in the past,most of the sacrificial anode cathodic protection of the ruins were carried out by empirical estimation methods.Due to the insufficient amount and installation position of the sacrificial anode,the sacrificial anode was consumed in a short time,so it is urgently needed A more scientific method to design a cathodic protection system.This paper uses COMSOL Multiphysics software to design and research the sacrificial anode cathodic protection system of the Jing-yuan shipwreck site,and provide a scientific basis for the protection of the shipwreck.(1)Select the appropriate protection current density according to the surface state of the long-distance ship and the surrounding environment,and calculate the area of the protected substrate through the simulation software,and use the formula to calculate that the shipwreck hull and components are protected by the two sacrificial anode materials of zinc alloy and aluminum alloy.The number of sacrificial anodes.Obtain the electrical conductivity of artificial seawater and the electrochemical parameters of the sunken base material,zinc alloy,and aluminum alloy sacrificial anode through a conductivity meter,electrochemical workstation,etc.,and use the test results as the parameter values for simulation calculations.(2)After simulation calculation,when the number of zinc alloy sacrificial anodes is 28-40 pieces,the surface potential of the sunken ship hull meets the standard protection potential range requirements,and the hull does not corrode at this time;when the number of aluminum alloy sacrificial anodes is 12-14 pieces,the hull surface potential distribution meets the protection requirements.The surface potential of the ship hull under the protection of 14 aluminum alloy sacrificial anodes is measured by the scaled model method,and the difference is small with the simulated calculation value,which verifies the feasibility of the numerical simulation calculation.In the simulation of shipwreck components,15 and 16 zinc alloy sacrificial anodes meet the requirements,while aluminum alloy sacrificial anodes are not suitable for component protection.(3)Considering the complexity of the marine environment,the life of the sacrificial anode needs to be as long as possible,so the sunken ship is protected by a combination of coating and sacrificial anode.Simulation results show that this method can effectively extend the life of the sacrificial anode.(4)A simulation study on the factors that may affect the sacrificial anode protection of a sunken ship has been carried out.The results show that the sunken ship needs fewer sacrificial anodes in the sea mud electrolyte than in the seawater;as the temperature rises,the conductivity of the seawater becomes larger,and the shipwreck hull When the surface potential value of the wreck moves in the negative direction,the protection effect becomes better;when there is stray current around the sunken ship,it will inhibit the sacrificial anode protection system.