| Property | Zinc Anode 620 | Aluminum Anode (Al/Zn/In) | Magnesium Anode | |------------------------|------------------------|----------------------------|-----------------------| | (A·hr/kg) | 780 | 2,500 | 1,200 | | Driving Voltage | 0.25V (Low) | 0.30V (Moderate) | 0.70V (High) | | Best For | Seawater, Warm water | Seawater, Mud (Cost effective) | Soil, Fresh water | | Weight for 620 size | 6.2 kg | 2.4 kg (Same volume) | 1.8 kg (Same volume) |
In the world of cathodic protection (CP), few components are as vital or as misunderstood as the sacrificial zinc anode. Among the standard shapes and sizes, the (often referred to as the “620 profile” or “620 brace”) is a workhorse for the marine, offshore, and underground storage industries. If you are looking for the definitive zinc anode 620 datasheet , this guide provides full technical specifications, electrochemical performance data, and installation criteria. 1. What is the "Zinc Anode 620"? The term "620" typically denotes a Hull or Brace Anode weighing approximately 6.2 kg (13.66 lbs) or measuring roughly 620 mm in length depending on the manufacturer's code. However, the industry standard for the “620” profile most commonly refers to a trapezoidal or rectangular bar anode used predominantly on ship hulls, heat exchangers, and water box applications. zinc anode 620 datasheet
The Aluminum and Cadmium act as activators to ensure a uniform, film-free corrosion surface, guaranteeing a driving voltage of approximately 0.25V relative to steel. 3. Electrochemical Performance Data (The Critical Datasheet Metrics) This is the core of the zinc anode 620 datasheet . Do not purchase an anode without these values. | Property | Zinc Anode 620 | Aluminum
Technical Data Sheet (TDS) – MIL-DTL-18001 & ASTM B418 Compliant However, the industry standard for the “620” profile
| Element | Percentage (%) – MIL/ASTM Standard | |--------------------|-------------------------------------| | Zinc (Zn) | 99.86% Minimum | | Aluminum (Al) | 0.10% – 0.50% | | Cadmium (Cd) | 0.025% – 0.070% | | Iron (Fe) | 0.003% Max | | Lead (Pb) | 0.003% Max | | Copper (Cu) | 0.002% Max |