In this paper, chemical environment of Fe/0.5 mol·dm^-^3 H~2SO~4 system was designed according to the potentiostatic current oscillatios mechanism based on the temporal formation of Fe(OH)~2 and Fe~3O~4 films. The formation of Fe(OH)~2 and Fe~3O~4 films were promoted or inhibited through changing the pH and Fe^2^+ concentration in the interface of Fe/electrolyte. Thus the environment was created in that the current oscillations were observed. The results provide support to the potentiostatic current oscillations mechanism of Fe/0.5 mol·dm^-^3 H~2SO~4 system based on the temporal formation of Fe(OH)~2 and Fe~3O~4 films.

Key words: SULFURIC ACID, IRON