Sacrificial anodes must meet strict electrochemical metrics to guarantee long-term asset safety.
The targeted purity and alloy balance ensure the anode remains active and passivation-free throughout its service life. Performance data for the alloy includes:
For bolt-on 620 anodes, the mounting surface on the vessel must be cleaned down to bare metal. Remove all paint, rust, and scale from the mounting studs to achieve a resistance reading of less than 0.1 ohms.
Coat exposed steel tabs with marine epoxy, leaving the zinc body completely bare. Critical Safety Warnings
Typically rated between 90% and 95% in high-salinity seawater. Primary Applications zinc anode 620 datasheet
| Standard | Equivalent Code | | :--- | :--- | | | Type 620 (Frame) | | DNV-RP-B401 | ZHS (Zinc Hull Small) | | ISO 15589-2 | Zn-Alloy A |
Ideal for repairing or touching up existing inorganic zinc coatings. 5. Safety and Handling
Zinc anodes are favored for their stable and predictable performance.
Understanding the Zinc Anode 620: Specifications, Applications, and Datasheet Guide Remove all paint, rust, and scale from the
Iron (Fe) is the most destructive impurity in a zinc anode. If iron levels exceed 0.005%, the anode forms a dense, tightly adherent passive layer of zinc hydroxide on its surface. This layer increases internal resistance, stops the sacrificial current flow, and renders the anode useless. The inclusion of aluminum and cadmium ensures that the corrosion crust remains loose and flakes away, exposing fresh zinc over time. 2. Electrochemical Characteristics
: Ideal for structures in saltwater or brackish water where aluminum or magnesium might over-protect.
Standard Marine (MIL-DTL-18001K) vs. High-Purity Soil/Freshwater Grade (ASTM B418 Type II).
The "620" typically denotes the net weight (0.62 kg or 1.37 lbs) of zinc, though some industrial suppliers use the code for a 620 cu. cm volume. The most common commercial variant used in North America and Europe is the : Primary Applications | Standard | Equivalent Code |
The contact resistance between the anode core and the protected structure must be less than 0.01 Ohms.
: Designed for offshore structures, marine and port facilities, petrochemical plants, pipelines, and bridges.
Welded areas and damaged sections must be thoroughly cleaned and power-tooled to or better before applying Zincanode 620 5. Application Instructions Zincanode 620