How to Select Galvanized Wire for Marine Aquaculture Cages Under Heavy Salt Spray to Achieve 2-Year Service Life
Release time:
2026-07-31
Marine aquaculture areas feature high chloride ion concentration, alternating wet and dry conditions, which cause severe corrosion. Ordinary galvanized wire often rusts and fractures within 6–8 months.
Marine aquaculture areas feature high chloride ion concentration, alternating wet and dry conditions, which cause severe corrosion. Ordinary galvanized wire often rusts and fractures within 6–8 months.
Core Selection Standard
- Base Material: Constant temperature annealed low carbon steel wire. Avoid simple annealed wire with high internal stress.
- Coating Type: Only hot-dip galvanized wire. Electro-galvanized wire is prohibited. Minimum zinc coating weight: ≥300g/㎡. Choose matte thick coating instead of bright thin galvanized wire.
- Post-treatment: Trivalent chromium passivation + silane sealing is mandatory. Sealing fills micro-pores of zinc layer and blocks chloride penetration, extending service life greatly.
- Premium alternative: Hot-dip Galfan wire (5% Al-Zn alloy coating), better anti-corrosion performance in seawater.
Construction Tips
- Avoid repeated sharp bending to prevent coating cracks.
- Prevent direct contact between galvanized wire and copper/stainless steel to avoid galvanic corrosion.
- Regularly clean marine organisms attached to cages.
Summary
Only matching substrate, galvanizing process and complete passivation & sealing can guarantee stable 2-year service life in seawater environment.
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