I produced the magnesium alloy used to produce high-quality raw materials, anode potential negative, large capacity per unit mass occurs, is the ideal sacrificial anode material. For soil, freshwater and seawater media cathodic protection of metal structures, such as oil gas pipeline, storage tanks, hot water exchanger, condenser and so on. Features: (1) the proportion of small, more negative potentials. (2) of the iron-driven high voltage, low current efficiency. (3) especially for high resistivity media. Anode specifications: Models Weight/kg L×(A+B)×H MG-4 4±0.2 350×(95+75) ×75 MG-8 8±0.2 700×(95+75) ×75 MG-11 11±0.2 700×(110+90) ×88 MG-14 14±0.2 700×(120+100) ×102 MG-22 22±0.5 700×(150+130) ×125