ANODIC BEHAVIOUR OF SINTERED POWDER IRON IN SULFURIC ACID SOLUTIONS
The anodic behaviour of sintered powder iron with porosity of 16-17 and 22-23% in 0.5 M H <sub>2</sub>SO <sub>4</sub>, 0.25 M H <sub>2</sub>SO <sub>4</sub>, and 0.25 M H <sub>2</sub>SO <sub>4</sub> + 0.25 M Na <sub>2</sub>SO <sub>4</sub> solutions was studied by potentiodynamic polarization measurements and chronoamperometry. Effects of the porosity of sintered specimens, sulfuric acid concentration, and potential sweep rate on the anodic behaviour of porous iron are described. Current oscillations in the transition range between active and passive state of the metal are discussed.