Aluminum sacrificial anodes are mostly used for cathodic protection of metal structures in seawater environments or bottom plates in crude oil storage tanks, and cannot be used in soil environments with low chloride ion content (for indium-containing anodes, the chloride ion content is greater than 1000 ppm; mercury-containing anodes are 10000 ppm). The electrode potential is -1.05V CSE. When the temperature is higher than 49℃, the capacitance decreases with the temperature. You can refer to the formula: Z=2500-27 (T-20), (T anode working temperature ℃). In salt water, the current capacity may be reduced to half. The aluminum sacrificial anode is directly fixed on the protected structure without filler.