The filling material of sacrificial anode is mainly made of gypsum powder, sodium sulfate and bentonite. The commonly used filling material ratio is: gypsum powder 75%, bentonite 20%, sodium sulfate 5%.
If the anode is directly buried in the soil, the corrosion of the anode itself will be aggravated because of the difference in soil composition, and the anode consumption will be uneven. The use of filler material in soil can reduce the ground resistance of sacrificial anode, increase the current, and achieve the purpose of uniform anode consumption. In THE PACKING material containing gypsum powder, the corrosion products of anode can be loosened and the resistance is reduced, the bentonite can keep the soil moist, and sodium sulfate is the active medium. Therefore, the sacrificial anode can play the best effect in the filling material environment containing gypsum powder, sodium sulfate and bentonite.
