Simulation Of Metal Soil Corrosion Behavior And Product Layer Based On Cellular Automata

Buried pipelines are widely used in industry and life,and metal soil corrosion of buried pipelines is a major influencing factor leading to pipeline leakage.Therefore,the study of the corrosion resistance of metals in the soil environment is conducive to safeguarding industrial production and residential life.At present,metal soil corrosion research methods are mainly experimental and numerical simulation.Numerical simulation compared to conventional experimental research method,it has the advantages of short experimental cycle,less consumables and so on.At present in the metal soil corrosion numerical simulation methods,the principle of meta-cellular automata and soil corrosion mechanism is more consistent,the unique randomness and connectivity of meta-cellular automata can be the soil corrosion of each influencing factor in the simulation of diffusion and electrochemical reactions evolved.First of all,research to master the metal soil corrosion process and electrochemical reaction mechanism,according to the corrosion mechanism to the soil matrix as a porous transport medium,set water,oxygen,oxygenated water and other cells,with diffusion probability P_dto control the diffusion transfer of various types of cells in each solution,with corrosion dissolution probability P_w control the metal matrix and each electrochemical reactant cells to produce reactions to generate intermediate corrosion products,and control the control of intermediate corrosion products The generation of layering.Second,The two-dimensional meta-cellular automata model of metal soil corrosion constructed in this paper successfully simulates the layering of corrosion products in the metal soil corrosion process,and the corrosion rate changes with changing water content,which is consistent with the metal soil corrosion mechanism.Based on the successful construction of a two-dimensional meta-cellular automata model for metal soil corrosion,the research and development of a three-dimensional meta-cellular automata model for metal soil corrosion has been extended.In the 3D model simulation results,the metal soil corrosion evolution process can be observed simultaneously from two positions,namely the cut surface and the plane,and the simulation results finally show the actual metal soil corrosion evolution process.In the three-dimensional level,the diffusion probability P_d controls the movement of each reaction cell and plays a major role in controlling the corrosion depth,while the corrosion dissolution probability P_w controls the contact reaction of each reactant and plays a major role in controlling the corrosion area.In the three-dimensional metal soil corrosion cellular automata model,the diffusion probability and corrosion dissolution probability can be controlled to simulate the corrosion evolution in various soil environments.A three-dimensional metal soil corrosion cellular automaton model with salt ions(Cl^-and SO₄^2-)was added to investigate the corrosion model affected by Cl^-and s SO₄^2-to simulate the change in corrosion rate of metal soil under two different ion contents.The results show that corrosion rates are salt ion-dependent;with the increase of Cl^-content,the corrosion depth of the metal increases more obviously and the corrosion rate increases first and then decreases;similar to Cl^-,the amount of SO₄^2-affects the corrosion rate.Simulation results are consistent with the actual corrosion results.Using the metacellular automata method,a variety of metacell types are introduced,diffusion probability and corrosion dissolution probability control parameters are set,and the model construction for corrosion product layer evolution is demonstrated from two-dimensional to three-dimensional levels,establishing a relatively more complete and realistic metacellular automata model for metal soil corrosion,proposing new ideas for the study of metal soil corrosion and new solutions for the corrosion protection of buried pipelines.