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Chemical properties and anode requirements of magnesium alloy sacrificial anodes

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Industry dynamics

Corporate news

Release time:

2023-02-14 16:03

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【Summary Description】Anode requirements: 1, the potential is negative enough, but should not be too negative, so as to avoid hydrogen evolution reaction in the cathode region; 2. The polarizability of the anode should be small, and the current output of the potential pole should be stable; 3. The capacitance of anode material should be large; 4, must have high current efficiency;
Performance Standard type Mg-mn type remarks
Density g/cm³

1.77

1.74

  
Open circuit potential V

-1.55

-1.70

 Relative CSE
Theoretical capacitance A.h/kg

2210

2200

  
Theoretical current efficiency %

55

50

 In seawater, 3mA/cm² Under condition
Actual current efficiency %

≥50

40

 In soil, 0.03mA/cm² Under condition
Actual capacitance A.h/kg

1110

880

  

Anode requirement

1, the potential is negative enough, but should not be too negative, so as to avoid hydrogen evolution reaction in the cathode region;

2. The polarizability of the anode should be small, and the current output of the potential pole should be stable;

3. The capacitance of anode material should be large;

4, must have high current efficiency;

5, uniform dissolution. Easy to fall off;

6, the material price is low, the source is sufficient.

7, the corrosion products should be non-toxic and harmless, do not pollute the environment, no hazard.

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