Zinc alloy sacrificial anode

Introduction:Zinc alloy sacrificial anode main component ‘zinc’, chemical symbol is Zn, atomic number is 30, atomic weight is 65.38. a light grey excessive metal, density is 7.14g/cm3, melting point is 419.5 ℃. Zinc alloy sacrificial anode is mostly used in soil environment with soil resistivity less than 20 ohm-m or seawater environment. The electrode potential is -1.10 VCSE, and the driving voltage is 0.25 V. Intergranular corrosion occurs when the temperature is higher than 49°C, and the electrode potential of zinc anode becomes positive when it is higher than 54°C. It reverses the polarity with steel and becomes cathode to be protected, while steel becomes anode to be corroded. Therefore, zinc anode is generally used in the environment where the temperature is lower than 49℃. Zinc anodes must use backfill.

Main performance:Zinc alloy sacrificial anode has very high electrochemical performance, large power generation per unit weight of anode material, about 2/3 times of magnesium anode. In seawater and other media containing chloride ions, the performance is good, and the self-regulation ability of the issued current is strong. Zinc anode compared to magnesium anode is not enough to drive the potential is a little difference, but the reaction of zinc anode is more uniform, high current efficiency, self-soluble good, long protection life, up to 20 ~ 30 years, generally does not occur ‘over-protection’ phenomenon. It is because of these advantages that zinc anode can play a role in many fields. Zinc anode can be used in soil and seawater, such as buried in the underground water pipeline zinc anode is a good choice, the cathodic protection of the outer wall of the gate and the ship also mostly choose zinc anode.

Scope of application

Zinc alloy sacrificial anode is a sacrificial anode for cathodic protection of metal components in electrolytes such as seawater, fresh seawater, soil, etc., where the temperature is lower than 50℃ and the resistivity is less than 15Ω-m, including the sacrificial anode for cathodic protection of steel structures of ships, harbour facilities, ballast water tanks, mechanical equipment, ocean engineering, drilling platforms, buried metal pipelines, storage tanks, seawater cooling systems and so on. This method is usually applied to prevent the corrosion of ship hulls, etc. by installing a certain amount of zinc blocks at the stern of the ship and in the part of the ship's hull below the waterline.

Ribbon zinc anode construction site