2.2. Galvanic assay
The galvanic corrosion was investigated in static immersion tests,
which were carried out at 50 °C for 3 weeks, based on procedures
described in ABNT NBR 8645 standard [16]. The specimens were
prepared to a 400 grit SiC surface finish, washed in demineralized
water, rinsed in acetone, and dried in air stream. Then individual
dimensions were measured and the specimens were weighted on
analytical balance to an accuracy of ±0.1 mg. Teflon screws were used
to keep the galvanic pairs (zamak–1010 steel, zamak–420 steel,
zamak–Al–Si alloy) together. All assays were carried out in duplicate,
using 170 ml of alcoholic solution by pair. Fig. 1 shows a schematic
picture of the system used to evaluate the galvanic corrosion in this