High petential magnesium alloy sacrificial anode material and its manufacturing method

[0023] Implementation mode 1:

[0024] The chemical composition of the high potential magnesium alloy sacrificial anode material (by mass percentage wt%) is: Mn0.500%, Ce1.000%, Ca0.010%, Si≤0.050%, Cu≤0.020%, Ni≤0.001%, Fe ≤0.030%, the rest is Mg.

[0025] I. Preparation, 1# magnesium ingot 88%, electrolytic manganese 4%, Mg-Ca (containing Ca20%) master alloy 5% and Mg-RE (containing Ce50%) master alloy 3% and preheating and baking; II. Put magnesium in SF 6 +CO 2 After melting under gas protection, add electrolytic manganese and NaF flux 5%/(accounting for manganese addition) at 780°C, add appropriate amount of Mg-Ca and Mg-RE master alloy for alloying treatment after holding at 760°C for 10 minutes; III .When the melt temperature is controlled at 760℃, add 1.00% of the melt weight of the magnesium sacrificial anode self-made special refining agent (calculated as the mass percentage wt%: MgCl 2 20%, KCl25%, BaCl 2 14%, MgF 2 15%, CaF 2 16%, NaF10%) for refining; IV. Let it stand for 40 minutes, and after the detected components are qualified, it is poured into a metal mold within a temperature range of 760°C to solidify and form.

[0026] The structure of this high-potential magnesium alloy sacrificial anode material is characterized by the dispersion of fine Mn phase particles within the grains of α-Mg, and the presence of Mg on the grain boundaries. 2 Ca and Mg 2 The particles and grain structure of the Ce phase are all formed by equiaxed crystals (as shown in Figure 1), the potential is 1.7 (-V), and the current efficiency is 55%.

[0027] Implementation mode 2:

[0028] The chemical composition of the high potential magnesium alloy sacrificial anode material (by mass percentage wt%) is: Mn2.000%, Ce0.100%, Ca0.500%, Si≤0.050%, Cu≤0.020%, Ni≤0.001%, Fe ≤0.030%, the rest is Mg.

[0029] I. Prepare materials, weigh 93% of 1# magnesium ingot, 2% of electrolytic manganese, 2% of Mg-Ca3% and Mg-RE master alloy and preheat and bake; II. Put magnesium in SF 6 +CO 2After melting under gas protection, add electrolytic manganese and NaF flux 10%/(manganese addition) at 800°C, add appropriate amount of Mg-Ca and Mg-RE master alloy for alloying treatment after holding at 780°C for 15 minutes; III. When the temperature of the melt is controlled at 780°C, add a special self-made refining agent for magnesium sacrificial anode of 1.50% by weight of the melt (calculated by mass percentage wt% as: MgCl 2 30%, KCl21%, BaCl 2 11%, MgF 2 10%, CaF220%, NaF8%) for refining; IV. Let it stand for 60 minutes, and after the detected composition is qualified, it is poured into a metal mold at a temperature of 740°C to solidify and form.

[0030] The structure of this high-potential magnesium alloy sacrificial anode material is characterized by the dispersion of fine Mn phase particles within the grains of α-Mg, and the presence of Mg on the grain boundaries. 2 Ca and Mg 2 The particles and grain structure of the Ce phase are all formed by equiaxed crystals (as shown in Figure 2), the potential is 1.80 (-V), and the current efficiency is 60%.

[0031] Implementation mode 3:

[0032] The chemical composition of the high potential magnesium alloy sacrificial anode material (by mass percentage wt%) is: Mn1.000%, Ce0.600%, Ca1.000%, Si≤0.050%, Cu≤0.020%, Ni≤0.001%, Fe ≤0.030%, the rest is Mg.

[0033] I. Prepare materials, weigh 97% of 1# magnesium ingot, 1% of electrolytic manganese, 1% of Mg-Ca and Mg-RE master alloy and preheat and bake; II. Put magnesium in SF 6 +CO 2 After melting under gas protection, add electrolytic manganese and NaF flux 7.5%/(addition of manganese) at 790°C, add appropriate amount of Mg-Ca and Mg-RE master alloy for alloying treatment after holding at 770°C for 12 minutes; III. When the melt temperature is controlled at 770°C, 1.25% of the melt weight is added to the self-made special refining agent for magnesium sacrificial anode (calculated by mass percentage wt%: MgCl 2 28%, KCl16%, BaCl 2 18%, MgF 2 20%, CaF 2 12%, NaF6%) for refining; IV. Let it stand for 50 minutes, and after the detected components are qualified, it is poured into a metal mold within a temperature range of 750° C. to solidify and form.

[0034] The structure of this high-potential magnesium alloy sacrificial anode material is characterized by the dispersion of fine Mn phase particles within the grains of α-Mg, and the presence of Mg on or near the grain boundaries. 2 Ca and Mg 2 The particles and grain structure of the Ce phase are all formed by equiaxed crystals (as shown in Figure 3), the potential is 1.75 (-V), and the current efficiency is 58%.