Abstract
Experiments were conducted by US Bureau of Mines researchers with iron-aluminum alloys (5–25wt.%Al) in 1 N H 2SO 4 to determine the amount of charge required to repassivate their surfaces following scratching with a diamond indenter, to gain a better understanding of how wear and corrosion interact. This understanding is aimed at reducing the corrosion and wear of materials. Solutions saturated with air were used at ambient temperature. Formation of the passive films was studied by measuring the current transient resulting from stepping from the open circuit corrosion potential to the passive region of +1.175 V(NHE). The repassivation kinetics were studied by measuring the current transient caused by scratching a rotating disc electrode with a diamond indenter while holding at the passivation potential. Comparison of the charge density required to form or repair the passive film was made for the potential step and scratching experiments. The amount of charge required to repassivate the film was determined as a function of indenter load, shape, velocity and aluminum content.
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