Electrochemical behavior of Mg-Al-Zn-In alloy as anode materials in 3.5 wt.% NaCl solution

New insights on the influence of low frequency pulsed current on the characteristics of PEO coatings formed on AZ31B

“…The inductive loops at low frequencies are normally related to dissolution of the metal in a corrosion system, also this phenomena is attributed to the relaxation of adsorbed species, such as Mg 2+ or MgOH + [62,63]. The capacitive loop observed at high frequencies is related to the charge transfer resistance in parallel combination with the relaxation of the electrical double-layer; while the capacitive loop at low frequencies is relate to corrosion product formation [4].…”

“…This indicates that those coatings are permeable to the electrolyte, while the protective capacity of the 2DC coating was improved during the test, and the rate of electrolyte permeation was dependent on the coating type. In order to make a convenient analysis of the impedance results, it was considered that the diameter of the first capacitive loop, observed at high frequencies, could be related to the charge transfer resistance of the substrate and the evolution of that loop was due to the formation of corrosion products on the metal/electrolyte interface during the immersion time [62,64]. Some authors have indicated that is common in some magnesium alloys to observe an increase in the capacitive loop with immersion time associated with the diminishing or vanishing of the inductive loop suggesting an improvement of the protection of the surface by the corrosion products [65].…”

Effects of microstructure evolution on discharge properties of AZ31 alloy as anode for seawater battery

“…Moreover, research conducted on magnesium alloys as anode materials for the seawater battery is attributed to its excellent discharge performance, that is, more negative electrode potential (i.e., −2.37 V [vs. saturated calomel electrode (SCE)]) and lower density (i.e., 1.74 g/cm 3 ) compared to aluminum and zinc, having a high theoretical specific capacity (i.e., 2.2 A•h/g) and, therefore, high specific energy density (i.e., 6.8 kW•h/kg). [4][5][6][7] Nevertheless, polarization caused by corrosion products adhering to the surface, severe self-corrosion, and low utilization performance of magnesium alloys remains to be solved. [8][9][10] Doping with alloying elements, such as Al, Li, Hg, Pb, Ga, Sn, In, Ce, and so on, is an effective way to improve the discharge performance of magnesium alloys.…”

“…[8][9][10] Doping with alloying elements, such as Al, Li, Hg, Pb, Ga, Sn, In, Ce, and so on, is an effective way to improve the discharge performance of magnesium alloys. [6,[10][11][12][13][14] Although Mg-Al-Pb and Mg-Hg-Ga alloys reveal excellent discharge activity and utilization efficiency, Pb, Hg, and Ga can be very harmful to the environment. [4,15,16] Mg-Li anodes can be a promising candidate for seawater battery anodes.…”

The electrochemical behavior of Mg–9Al–0.5Zn, Mg–9Al–0.7Zn, and Mg–9Al–1.0Zn in a NaCl solution

“…However, because pure Mg as the anode material naturally causes self‐discharge reactions and lag effects, it has the following disadvantages: (1) low‐current efficiency, (2) weak‐corrosion resistance, and (3) long‐occurrence time . Considering that the corrosion process is controlled by the pitting corrosion rate, these problems can be solved by doping other elements (such as zinc, aluminum, and manganese) into the magnesium alloys …”