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Processes 2020, 8, 1362 13 of 17 Processes 2020, 8, x FOR PEER REVIEW 13 of 17 Figure 10. Metallographic microscope images of (a) Mg,(b) Mg–8%Al, and (c) Mg–8%Al–0.4%Bi soaked Figure 10. Metallographic microscope images of (a) Mg,(b) Mg–8%Al, and (c) Mg–8%Al–0.4%Bi in 3.5% NaCl solution for 12 h; (d) Mg, (e) Mg–8%Al, and (f) Mg–8%Al–0.4%Bi soaked in 3.5% NaCl soaked in 3.5% NaCl solution for 12h; (d) Mg, (e) Mg–8%Al, and (f) Mg–8%Al–0.4%Bi soaked in 3.5% NaCl solution for 24h. solution for 24 h. 4. Discussion 4. Discussion The mechanism diagram of the pure Mg and Mg–8%Al–0.4%Bi alloy discharge process and the The mechanism diagram of the pure Mg and Mg–8%Al–0.4%Bi alloy discharge process and the cross-section of corrosion products are depicted in Figure 11. Song [46] found that during the discharge cross-section of corrosion products are depicted in Figure 11. Song [46] found that during the prodciescshsaorfgme pargoncesisuomf managdnmesaiugmneasniudmmalglonyesi,uamparolltoeycst,ivaepfirolmtecotifvMe fgil(mOHof)Migs(fOoHrm)2eids fonrmtheedaonode 2 surtfhaecea.noBdeecasursfeacteh.eBpecroautescetitvhe plaryoetercitsivleoolasyeerinisthloeopsereisnetnhceeporfescenrctaeinoficoenrsta(isnuicohnsas(suCclh- eatsc.C) l-and canentco.)tpanedelcoaffnnqouticpkeleyl,othffeqpurioctkelyct,itvheepperroftoercmtivaencpeeroffotrhmeafinlcme oisf tphoeofrilamndisthpeoodrisacnhdartghepdeisrcfhoarmrgaence performance is reduced, as shown in Figure 11a. However, it can be clearly seen from Figure 6 that is reduced, as shown in Figure 11a. However, it can be clearly seen from Figure 6 that the surface of −2 −2 the surface of the pure Mg is corroded very seriously after discharging in 120 mA cm , while the the pure Mg is corroded very seriously after discharging in 120 mA cm , while the surface of the surface of the Mg–8%Al–0.4%Bi alloy is very flat and shows good corrosion resistance, which means Mg–8%Al–0.4%Bi alloy is very flat and shows good corrosion resistance, which means the protection the protection of the film formed by the Mg–Al–Bi alloy is greater than that of the Mg(OH)2 film of the film formed by the Mg–Al–Bi alloy is greater than that of the Mg(OH)2 film formed by pure Mg formed by pure Mg in discharge. It can be seen from Figure 6 that after the addition of Al and Bi, the in discharge. It can be seen from Figure 6 that after the addition of Al and Bi, the corrosion resistance corrosion resistance of the alloy becomes better and the alloy surface film becomes thin. This may be of the alloy becomes better and the alloy surface film becomes thin. This may be because Bi has a because Bi has a high hydrogen evolution overpotential. In general, the higher the hydrogen high hydrogen evolution overpotential. In general, the higher the hydrogen evolution overpotential, evolution overpotential, the greater the resistance of the hydrogen evolution reaction, thereby the greater the resistance of the hydrogen evolution reaction, thereby slowing down self-corrosion. slowing down self-corrosion. At the same time, the Mg17Al12 and BiOCl produced in the discharge At the same time, the Mg Al and BiOCl produced in the discharge process peel off the Mg(OH) 17 12 2 process peel off the Mg(OH)2 film, which improved the discharge performance of the anode, as film, which improved the discharge performance of the anode, as shown in Figure 11b. shown in Figure 11b.PDF Image | Alloy Anode for Seawater Batteries and Related Mechanisms
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