Zinc Anode 620 Datasheet » ❲Legit❳

| Standard | Equivalent Code | | :--- | :--- | | MIL-DTL-18001 | Type 620 (Frame) | | DNV-RP-B401 | ZHS (Zinc Hull Small) | | ISO 15589-2 | Zn-Alloy A |

The Zinc Anode Type 620 is a precision-engineered sacrificial anode designed primarily for cathodic protection in saltwater and brackish environments. Adhering to military specification MIL-DTL-18001L (or commercial equivalents), the Type 620 is most commonly recognized as a hull-mounted or side-frame anode for vessels ranging from tugboats to offshore supply vessels.

This datasheet provides engineers and maintenance crews with the exact electro-chemical properties, dimensional data, and installation requirements for the 620-series anode.

Formula: Life (Years) = (Weight (kg) × Capacity (A·h/kg)) / (Current (A) × 8760 h/yr) zinc anode 620 datasheet

Scenario (6.8 kg hull anode):

If you are writing a technical paper on the material properties of a Zinc Anode used in batteries or galvanization, here is the general technical data regarding high-purity zinc anodes (often used in electroplating or advanced Zn-air/Flow batteries).

To ensure active potential and prevent passivation, the Type 620 alloy must contain specific trace elements. Impurities like iron and copper are strictly limited to prevent the formation of a passive oxide film. | Standard | Equivalent Code | | :---

| Element | Composition (%) | Function | | :--- | :--- | :--- | | Zinc (Zn) | 99.9% Min | Base metal (Active) | | Aluminum (Al) | 0.1 – 0.5% | Ensures uniform corrosion | | Cadmium (Cd) | 0.025 – 0.07% | Activates the anode | | Iron (Fe) | 0.005% Max | Prevents passivation | | Lead (Pb) | 0.006% Max | Prevents galvanic reversal |

Note: Do not use “Pure” (unalloyed) zinc in seawater. Without Aluminum and Cadmium, the anode will coat in zinc oxide and stop working.

  • Follow applicable marine/cathodic protection standards and local regulations.

    • The performance of a zinc anode is entirely dependent on its purity. Impurities (iron, copper, lead) cause passivation, where the anode stops working. The Zinc Anode 620 must meet strict limits: Formula: Life (Years) = (Weight (kg) × Capacity

    | 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 |

    Why this matters: 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.