Use the Sacrificial Point Anode node to model sphere-shaped dissolving metal electrodes in corrosion protection applications. The node is defined on a point in a 2D or 3D geometry, and the electrochemical reactions are defined on a virtual sphere in the geometry, located at a given radius around the point. A Sacrificial Point Anode can only be applied to points within, or adjacent to, Electrolyte domains. The node is active if Enable Cathodic Protection Features check box is enabled at the interface node.

As the metal electrode dissolves, the sphere radius decreases. In time-dependent simulations, the node solves for a capacity (SI unit: C) degree of freedom to keep track of the total amount of passed charge in each selected point. The anode radius is defined so that it equals Initial radius (m) at the Initial capacity (SI unit: C), reaching the Terminal radius (m) when the capacity reaches zero.

The potential in the electronic phase and anode equilibrium potentials are used to keep track of the total amount of passed current in each selected point. The potential in the electronic phase can be defined by a Fixed electric potential, a Floating potential, an External short or a Connection point electric potential. The floating potential allows to specify the total current flowing through all edges selected by the node. The External short allows to connect two electrodes over an external connector with a given bulk resistance.