Zinc Anode 620 Datasheet
Zinc anodes are the unsung heroes of marine and industrial protection. When searching for a 620 datasheet, you are likely looking for a high-capacity, bolt-on sacrificial anode designed for hulls, ballast tanks, or large steel structures.
Below is a comprehensive technical breakdown of the specifications, applications, and installation guidelines for a standard 620-series zinc anode. ⚓ Zinc Anode 620 Technical Specifications
The "620" designation typically refers to a specific weight or size class in the marine industry, often weighing approximately 10–12 lbs (4.5–5.5 kg) depending on the specific manufacturer (e.g., Martyr, Camp, or Tecnoseal). Physical Dimensions (Standard) Length: 12 inches (305 mm) Width: 3 inches (76 mm) Thickness: 1.25 inches (32 mm) Bolt Centers: 6 inches (152 mm) — Common for "620" series Weight: ~11.5 lbs (Zinc alloy) Chemical Composition
To meet MIL-A-18001K (the gold standard for zinc anodes), the alloy must adhere to these strict percentages: Zinc (Zn): Remainder (approx. 99.3%) Aluminum (Al): 0.10% – 0.50% Cadmium (Cd): 0.025% – 0.07% Iron (Fe): 0.005% Max Lead (Pb): 0.006% Max Copper (Cu): 0.005% Max ⚡ Performance Characteristics
The 620 anode works via Galvanic Corrosion. It possesses a lower (more negative) electrochemical potential than the steel it protects.
Open Circuit Potential: -1.05 Volts (relative to Ag/AgCl reference electrode).
Electrochemical Capacity: 780 Amp-hours per kilogram (Ah/kg). Consumption Rate: Approx. 11 kg (24 lbs) per Amp-year. Density: 7.13 g/cm³. 🛠️ Key Applications zinc anode 620 datasheet
The 620 series is a "medium-heavy" anode, making it ideal for: Commercial Hulls: Tugs, barges, and fishing vessels. Ballast Tanks: Protecting internal steel from salt water.
Piers and Pilings: Mitigating corrosion on submerged infrastructure. Heat Exchangers: Large-scale industrial cooling systems. 📝 Installation & Maintenance Best Practices
To ensure your 620 anode provides maximum protection, follow these rules: Electrical Continuity
Never Paint Anodes: Paint insulates the zinc, rendering it useless.
Metal-to-Metal Contact: Ensure the mounting studs are wire-brushed and clean before bolting. Replacement Schedule
The 50% Rule: Replace the anode once it has consumed 50% of its original mass. Zinc anodes are the unsung heroes of marine
Active Monitoring: If an anode looks brand new after six months in salt water, it is likely not working due to poor electrical contact. Environmental Suitability Salt Water: Excellent (Zinc is the industry standard).
Brackish Water: Good (Aluminum may be preferred for low-salinity).
Fresh Water: Poor (Zinc can form a "crust" of oxide that stops the current; use Magnesium instead). If you'd like, I can help you:
Compare prices for 620 anodes from different marine suppliers.
Find the exact CAD drawings for a specific brand's 620 model.
Calculate how many anodes you need based on your vessel's surface area. Below is a datasheet breakdown for the most
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Below is a datasheet breakdown for the most likely candidate: the Energizer Industrial 620 (EN95) Zinc Battery, along with technical details on Zinc Anode composition in general.
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.
| 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.
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