OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 3 2024 (Fe, Cu, Al) is observed at electric potentials that are beyond the passive state region (from E1 = -1.20 V to E2 = -0.05 V). In the positive region of the potentials (from +0.0 V to +1.2 V), all specimens, including CuAl9Mn2, exhibit a sharp increase in the current density due to the following (possible) anodic processes [18, 19]: Al → Al3+ + 3e- (1) Al3+ + 3OH- → Al(OH) 3 (2) Cu → Cu+ + e-, Cu+ → Cu2+ + e- (3) Cu + Cl- → CuCl + e-, 2CuCl + H 2O → Cu2O + 2H + + 2Cl- (4) CuCl + Cl- → CuCl 2 -→ Cu2+ + 2Cl- + e- (5) 2Cu+ + H 2O → Cu2O + 2H + (6) Ta b l e 1 Mechanical properties obtained by microhardness measuring and static uniaxial tensile tests Specimen Mechanical characteristics σ0.2, MPa σu, MPa ε, % HV, GPa CuAl9Mn2 148±25 440±101 62 1.4 ± 0.17 ER 321 300±42 610±136 35 1.63 ± 0.09 CuAl9Mn2 – 10% ER 321 296±43 640±145 28 1.46 ± 0.19 CuAl9Mn2 – 25% ER 321 321±49 635±130 25 1.75 ± 0.09 CuAl9Mn2 – 50% ER 321 610±97 813±183 12 2.33 ± 0.1 CuAl9Mn2 – 75% ER 321 370±55 652±145 33 2.16 ± 0.12 Fig. 3. Cyclic voltammograms (20 mV/s) of specimens obtained in 3.5 wt. % NaCl solution. The black arrows indicate peaks of the current density in the cathode branch corresponding to the copper reduction reaction
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