ISO 12944 C5: очень высокая коррозионная нагрузка
Усиленные защитные системы для тяжелых промышленных и морских атмосферных условий.
Applicable Standards
Environment Definition
ISO 12944 C5 represents very high atmospheric corrosivity. It is used for severe coastal and marine atmospheres, aggressive industrial areas, and high-humidity environments where corrosion pressure is significantly higher than normal urban exposure.
Typical examples include coastal infrastructure, port steelwork, chemical plant structures, pulp and paper mills, offshore-adjacent facilities, and exposed industrial assets with demanding maintenance requirements.
Coating Selection Logic
C5 systems need careful technical review rather than a generic product recommendation. The system normally relies on excellent surface preparation, zinc-rich or inorganic zinc primer options, high-build epoxy barrier coats, and a durable exterior topcoat.
If the steel is exposed to immersion, tidal splash, buried service, or concentrated chemicals, evaluate CX or a dedicated immersion/chemical-resistance system.
Starting System Pattern
| Layer | Typical role | Notes |
|---|---|---|
| Surface preparation | Abrasive blasting with tight cleanliness control | Confirm Sa grade, profile, edge preparation, dust, oil, and salt contamination limits. |
| Primer | Inorganic zinc, epoxy zinc-rich, or approved high-performance primer | Confirm zinc content claims and compatibility with the next coat. |
| Intermediate | High-build epoxy MIO or other barrier layer | Often the main contributor to protective film build. |
| Topcoat | Fluorocarbon, aliphatic polyurethane, polysiloxane, or specialty topcoat | Select according to UV, color retention, chemical atmosphere, and maintenance plan. |
Technical Review Points
- Confirm whether the environment is marine atmosphere, industrial atmosphere, or a mixed coastal/industrial case.
- Define expected durability and inspection interval before choosing film build.
- Review edge retention, welds, bolts, and field repair details.
- Confirm current Qilu Paints TDS/SDS and destination-market documentation before specification.
Related Qilu Paints Products
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