We offer a magnesium anode potential negative charge per unit mass occurs big is the ideal sacrificial anode material. Applied to the soil, freshwater and seawater media cathodic protection of metallic structures. Magnesium alloy sacrificial anode according to national standard GB/T17731-2004 "magnesium alloy sacrificial anode" production, for pipe anode also comply SY/T0019-97 "Buried Steel Pipeline Cathodic Protection design specifications." Mainly used for high resistivity environment, the protection of the casing pipe, pipeline cathodic protection temporarily, tank and pipe network protection, anti-strong electrical interference grounding grid. Chemical composition of magnesium ribbon anode type Al Zn Mn Fe Ni Cu Si Mg Mg-I <0.010 <0.010 <0.030 <0.002 <0.001 <0.001 <0.010> 99.95 Mg-II <0.010 - 0.50-1.30 <0.03 <0.001 <0.02 - margin production specifications: cross-section (A × B) 9.5 × 19mm steel core diameter mm 3.2 Weight kg / m 0.37 Current output seawater 2.4A / m soil (5000Ω? cm) 10mA / m freshwater (15000Ω? cm) 3mA / m