In this paper we propose the numerical simulationof the internal Cr-plating process of bored gunbarrels, displayingcorner-shaped features. The growth of the Cr layer over amachined step is simulated by modelling the current densitydistribution under mixed activation and mass-transport control andcorrelating the local instantaneous current density to the growthrate. The problem with non linear and time-dependent boundaryconditions is solved by the FDM method in an iterative scheme.Experimental kinetic data were used to obtain an analytical formof the boundary conditions (relating local overvoltage to localcurrent density); original routines were devised in order to achieveefficient convergence with realistic cathodic kinetics.Experimental parameters from an industrial production plant wereused to model the hydrodynamic effects on the growth of thecoating. Predictions of Cr-coating growth profiles were comparedwith experiments.
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