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The mass transfer role in corrosion processes was discussed and experimentally investigated. The effect of artificial surface roughness (channel parallel to flow with variable depths ranging from zero to 3 mm) on mass transfer rates was studied in a flow system. Various models describing the interaction between corrosion and mass transfer from rough surfaces were also discussed. The limiting current technique which involves the cathodic reduction of ferricyanide ion was used in the experimental study. The obtained results of the flow system covered Reynolds number range of 0 → 29456 and revealed a significant increase in mass transfer due to the surface roughness which reached a value up to 3 times more than the corresponding smooth surface value. A correlation in terms of Sherwood number and Reynolds number was developed for each electrode in the following form:sh=a Reb,where a and b are constants depending on the roughness height.