OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 1 2023 Fig. 5. Microhardness of specimens printed from C65500 and with the addition of aluminum filament. Printing modes 1 (1), 2 (2) and 3 (3). Specimens after annealing (4), deformation and subsequent annealing (5). Specimens with the addition of 10 wt.% Al (6), 10 wt.% Al–5Si (7) and 10 wt.% Al–12Si (8) manufactured and pre-deformed specimens leads to a decrease in the value of the corrosion potential. The corrosion current for this group of specimens does not change significantly (from 5.5 to 5.74 μA). The potentiodynamic polarization curves for the second group of specimens printed with the addition of an aluminum filament are shown in Figure 6, b. By its nature, it is similar to those of the as-printed silicon bronze specimens (Fig. 6, a). An exception is a specimen printed with the addition of Al-12Si alloy. In this case, no surface passivation area is observed, and anodic dissolution begins immediately. For these specimens the corrosion potential ranges from -193 mV to -251 mV, which is generally close in magnitude to that of as-printed silicon, bronze (Table 2). The value of the corrosion current for the specimen C65500 + 10 wt.% Al-5Si is the smallest, and for samples C65500 + 10 wt.% Al and C65500 + 0 wt.% Al-12Si is the largest among those considered in this work. a b Fig. 6. Polarization curves for specimens printed from C65500 (a) and with the addition of aluminum filament (b)
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