Numerical simulation study on influence of corrosion defects on cathodic protection effect for tank connections
Tank connections were constantly exposed to corrosive environments,which can easily lead to the formation of corro-sion defects.Corrosion defects were difficult to detect and continued to expand in depth,resulting in pipe leakage accidents,thus posing significant potential risks.The influence of surface corrosion defects on the cathodic protection effect for tank connections was studied by numerical simulation.The boundary conditions such as potential and current density required for simulation were obtained by measuring the polarization curve.Then,local current density and potential changes at different corrosion defects on the surface of connections were simulated by ABAQUSCAE.The results displayed the impact of cathodic protection inside the corrosion defect was related to the shape,size,and depth of the defect.The uneven distribution of cathodic protection potential and current density made it impossible to provide complete and effective protection for areas with corrosion defects at the connec-tions.The cathodic protection current was partially shielded at the corrosion defect,especially at the bottom of the defect.With the increase of defect depth or the decrease of defect width,the cathodic protection potential at the bottom of the defect became positive,the current density intensified,and the shielding effect of the defect on cathodic protection was enhanced,leading to a poorer cathodic protection result.A more negative cathodic protection potential helped to improve the cathodic protection effect of the corrosion defect area at connections.The results can provide reference for the evaluation of cathodic protection effect of tank connections.
tank connectionscorrosion defectscathodic protectionnumerical simulationresidual life
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维普
