A kind of hot-dip galvanizing anticorrosion composite coating structure of cable bridge

By employing a composite coating structure on the cable tray, consisting of a sandblasted substrate layer, a hot-dip galvanized layer, a chromium-free passivation layer, an epoxy zinc-rich primer layer, an epoxy micaceous iron oxide intermediate paint layer, and a fluorocarbon topcoat layer, the problem of short service life of cable trays in highly corrosive environments is solved, achieving highly efficient corrosion resistance.

CN224411667UActive Publication Date: 2026-06-26GUANGDONG YANDIAN ELECTRIC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG YANDIAN ELECTRIC TECH CO LTD
Filing Date
2025-05-09
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Cable trays have a short service life in highly corrosive environments, and traditional anti-corrosion methods suffer from problems such as insufficient interlayer bonding, poor coating compatibility, and environmental issues.

Method used

It adopts a composite coating structure from the inside out, including a sandblasted substrate layer, a hot-dip galvanized layer, a chromium-free passivation layer, an epoxy zinc-rich primer layer, an epoxy micaceous iron oxide intermediate paint layer, and a fluorocarbon topcoat layer, which improves corrosion resistance through electrochemical protection, physical shielding, and interface strengthening.

Benefits of technology

It significantly extends the corrosion protection life of cable trays to more than 25 years, improves salt spray resistance by 300%, and provides active and passive protection through multi-layer synergistic effects.

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Abstract

The utility model relates to the technical field of coating and provide a kind of hot-dip galvanizing anticorrosion composite coating structure of cable bridge, including following layer structure from inside to outside sequentially combined: cable bridge substrate layer after sandblasting treatment;Hot-dip galvanizing layer is covered in substrate layer surface, and its thickness is ≥85 μm;Formed in the surface of hot-dip galvanizing layer chromium-free passivation layer;Epoxy zinc-rich primer layer is coated on chromium-free passivation layer, and its dry film thickness is 60-80 μm;Epoxy micaceous iron oxide intermediate paint layer is covered in epoxy zinc-rich primer layer, and its dry film thickness is 100-120 μm;Fluorocarbon finish layer is set to the outer surface of epoxy micaceous iron oxide intermediate paint layer, and its dry film thickness is 40-50 μm.The utility model reaches active anticorrosion efficacy by electrochemical protection (zinc plating layer+zinc-rich paint);Passive barrier efficacy is reached by physical shielding (cloud iron paint+fluorocarbon finish);Interface strengthening (sandblasting+passivation) is passed through to promote interlayer combination.
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