Corrosive wear in an electrolyte solution is controlled by both mechanical and electrochemical factors. The authors have found in previous papers that the latter was very significant for type 304 stainless steel under reciprocating sliding. Especially, the corrosion rate at the fresh surface formed by mechanical action, i.e., sliding, is higher than at normal surfaces, and the corrosion behavior can be estimated by the current density obtained from the potential pulse method (PPM). In this paper the authors verify the adequacy of the estimation method above for scratching and unidirectional sliding conditions. Specimens used were pure iron and type 304 steel, and a scratch indenter was an Al 2O 3 tip, which was dropped on the rotating specimen surface in 0.1 M Na 2SO 4 solution at different potentials. The result showed that the electric charge density passed through the specimen under the scratch and unidirectional sliding almost coincided with the estimated value from the PPM. Therefore, it was concluded that the current density from the PPM can be applied to the estimation of the corrosion rate at the fresh surface in corrosive wear.