Mathematical modeling of local corrosion element in pipelines with galvanic couple operating in soil conditions

• Main Authors: Stepova, O.V., Parashchiyenko, I.M.
• Format: Article
• Language: English
• Published: Інститут геотехнічної механіки імені М.С. Полякова НАН України 2016
• Series: Геотехнічна механіка
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/136416

Solution of the problem of modeling electrochemical corrosion in the pipeline sector with cracked insulating coating under the effect of electrolytic medium aggressive towards the pipeline metal is presented in this paper. The problem boils down to determining a stationary electrolytic field which occurs in the pipeline sector (a) in the crack when galvanic macrocouple operates with anode and (b) under the pipeline insulating coating when galvanic macrocouple operates with cathode. The advantage of this model is its ability to predict corrosion of the pipeline on time, which is important for determining the residual life of the structure. Distribution of potential electric field is determined by solving of the Laplace two-dimensional differential equation with given boundary conditions hence helping to obtain functional dependencies for calculation of current density (corrosion rate) and operating electric the acting galvanic macrocouple "crack in the metal - metal under the insulation coating"