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The given work is focused on initial stages of corrosion fatigue andmodel of surface fatigue crack nucleation as result of corrosion deformationinteractions is proposed. As result the criterion of surface corrosion fatigue cracknucleation that relates the number of loading cycles N, for crack initiation, maximumcorrosion current per loading cycle Icorr , constants of electrochemical dissolution ofmetal surface and the characteristic stress ss is derived. On the base of this criterionthe expression for prediction of the number of loading cycles N, for surface corrosionfatigue crack initiation is received and which was verified by experimental data forconsidered electrochemical testing conditions.