Magnesium alloy sacrificial anode magnesium alloy anode potential negative energy per unit mass occurrence of large, 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" for buried metal pipes commonly used magnesium alloy sacrificial anode mainly in the following sizes: Type Specification Specification / mm Weight Weight / kg MGAZ-8 (75 +95) × 75 × 700 8 MGAZ-11 (90 +110) × 88 × 700 11 MGAZ- 14 (100 +120) × 102 × 700 14 MGAZ-22 (130 × 150) × 125 × 700 22 several typical chemical composition of magnesium alloy anode: Grades Al Zn Mn Fe (Max) Cu (Max) Ni (Max ) Si (Max) Ca (Max) Others (Max) Mg MGAZ63B 5.3 ~ 6.7 2.5 ~ 3.5 0.15 ~ 0.60 0.003 0.01 0.001 0.08 - 0.30 Balance MGAZ31B 2.5 ~ 3.5 0.60 ~ 1.4 0.20 ~ 1.0 0.003 0.01, 0.001 0.08 0.04 0.30 remainder amount MGM 1C ≤ 0.01 - 0.50, ~ 1.3 0.01 0.01 0.001 0.05 - 0.30 margin magnesium alloy anode electrochemical performance: grades OCP -V.Cu/CuSO4 Closed-circuit potential -V.Cu/CuSO4 Actual capacity / (Ah / kg) current efficiency /% MGAZ63B 1.57 ~ 1.67 1.52 ~ 1.57 ≥ 1210 ≥ 55 MGAZ31B 1.57 ~ 1.67 1.47 ~ 1.57 ≥ 1210 ≥ 55 MGM1C 1.77 ~ 1.82 1.64 ~ 1.69 ≥ 1100 ≥ 50