Global Weak Solutions and WellPosedness of Weak Solutions for a Moving Boundary Problem for a Coupled System of DiusionReaction Equations arising in the CorrosionModeling of Concrete Part

The evolution of the corrosion interface separating the uncorroded concrete part and the corroded part of a partially wet concrete wall of a pipe under the inuence of hydrogen sulde can be modelled by a moving boundary problem for three coupled onedimensional diusion equations We show that the problem formulated via weak solutions is wellposed The function describing the position of the moving boundary belongs to W I