Introduction to Tank Anti-Corrosion 11kg Magnesium Sacrificial Anode and Pre-packaged 22kg Magnesium Anode Polarization Test Coupon for Pipelines:

11kg Magnesium Sacrificial Anode

• Basic Characteristics: Primarily made of magnesium alloy material, featuring high electrochemical activity, excellent corrosion resistance, ease of processing and installation, and environmental friendliness.
• Working Principle: Based on the galvanic cell principle, magnesium has a more negative potential than the protected tank metal. In an electrolyte environment, the magnesium anode preferentially loses electrons and undergoes oxidation, releasing electrons that flow to the tank, enriching the tank surface with electrons and placing it in a cathodic state, thereby inhibiting the tank's corrosion reaction.
• Application Scope:
  • Tank Anti-Corrosion: Can be used for external wall anti-corrosion of various tanks, such as oil tanks and gas tanks, ensuring the tanks are not corroded in harsh environments.
  • Buried Pipeline Anti-Corrosion: Suitable for buried pipelines like oil and gas transmission lines, providing long-term and effective cathodic protection through proper installation.
  • Steel Structure Anti-Corrosion: Also applicable for anti-corrosion protection of other steel structures, forming a cathodic protection zone to inhibit corrosion reactions.
• Installation Key Points:
  • Installation Location: Should be installed in areas with good electrolyte flow, easy access, and minimal mechanical damage. The bottom or sides of the tank are ideal, with electrical connection to the tank via cables.
  • Installation Steps: Clean impurities from the anode surface; excavate to determine the burial location and trench size; place the anode in the trench and wrap it with backfill material; connect the anode lead cable to the shared anode cable, ensuring a secure connection; fix the anode using bolts and nuts; backfill the soil and water to saturate the magnesium anode.

22kg Magnesium Anode Polarization Test Coupon

• Function: Used to evaluate the effectiveness of the pipeline cathodic protection system. By connecting to the pipeline, it polarizes under the influence of the cathodic protection current. Its potential changes reflect the polarization state of the pipeline, thereby determining whether the cathodic protection meets requirements and effectively inhibits pipeline corrosion.
• Components:
  • Magnesium Alloy Anode: Made of magnesium-aluminum-zinc alloy or magnesium-manganese alloy, providing sufficient driving voltage for the pipeline.
  • Cable: Typically specifications like VV-10㎜2, used to connect the magnesium alloy anode to the pipeline, ensuring smooth electron transmission.
  • Backfill Material: Composed of gypsum powder, bentonite, etc., wrapped around the magnesium alloy anode to reduce contact resistance, maintain moisture, stabilize anode output current, and extend service life.
  • Cotton Cloth Bag and Plastic Woven Bag: Used to encapsulate the anode and backfill material, preventing moisture and impurities from entering and protecting the performance of the anode and backfill.
• Usage Precautions:
  • Polarization Time: Influenced by factors such as pipeline energization potential, soil permeability, moisture content, and burial depth of the test coupon. The time required for full polarization varies significantly, ranging from minutes to days. It is generally recommended to install the test coupon permanently rather than temporarily.
  • Off-Potential Measurement: After the test coupon is fully polarized, disconnect it from the pipeline and measure the coupon-to-earth potential within 0.1-0.3 seconds to obtain the off-potential.
  • Placement Location: For pipelines protected by sacrificial anodes, the test coupon should be buried midway between two sacrificial anodes or outside the anode voltage field (more than 10m away from the anode, with the connecting wire having a certain cross-sectional area).