12. Corrosion protection for steel structures and equipment
1. Match the corrosion environment
Steel protection requires knowledge of humidity, salts, industrial pollution, temperature and condensation. Dry indoor housings, coastal exposed steel and immersed components face different corrosion mechanisms. A general topcoat data sheet cannot cover every condition.
Polyaspartics may act as topcoats or perform other validated functions within suitable systems. Reducing coat numbers or applying directly to metal requires evidence for the specific product and system. Results from another manufacturer or an experimental system cannot be transferred to any product carrying the same technology name.
2. Surface preparation and edge protection remain essential
Oil, mill scale, rust, soluble salts and dust can compromise protection. Prepare steel to project and system requirements, paying particular attention to film continuity and effective thickness around welds, sharp corners, cut edges and fasteners.
Flat laboratory panels are easier to coat uniformly than the backs, gaps and inaccessible areas of real components. Define preparation, application and inspection methods for these locations before work starts, rather than improvise after the main surfaces are complete.
3. Salt-spray hours cannot be directly converted into service life
Salt-spray testing helps evaluate particular protective properties, while real service can combine UV exposure, wet–dry cycling, temperature changes, damage and complex contamination. Scribing, film thickness and substrate preparation all affect interpretation.
Check the complete layer system and test conditions during procurement. Where a service-life target is specified, develop a plan combining design evidence, exposure analysis, maintenance and responsibilities. Multiplying salt-spray hours by a fixed factor is not a reliable service-life calculation.
4. Equipment refurbishment also involves downtime and assembly
Refurbishment is often constrained by space and shutdown time. Identify surfaces that can be prepared in place, parts needing removal, interfaces that must remain uncoated and the permitted timing of reassembly and operation. Rapid curing saves time only when coordinated with these steps.
Hammered or low-gloss finishes may suit equipment housings with decorative requirements. Appearance remains part of the corrosion-protection system: texture does not replace rust removal, matte appearance does not replace thickness, and decorative coating should not conceal unresolved corrosion.