The variation of both separation and reattachment points is investigated numerically on the back-ward facing step flow. The effect of bubble agitation delays these points in comparison with those of single phase flow. The increment of turbulent shear stress due to the effect cause to the delayment of the points that were made by the adverse pressure gradient from the concave shape. Flow Accelerated Corrosion (FAC) is determined by two parameters - mass transfer coefficient, the characteristics of corrosion. The flow around separation or reattachement produces the strong turbulent kinetic energy and dissipation rate, so that occurs to the abrupt thickness variation of boundary layer. These charateristics affect the rate and the generation point of FAC and change the mass transfer coefficient.
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