Steel is one of the most versatile and durable materials in construction — but in marine and coastal environments, it faces some of the harshest conditions possible. Salt spray, high humidity, UV exposure, and abrasion can all accelerate corrosion, reducing a structure’s strength and lifespan if not properly managed.

At Hewaswater Engineering, we work extensively with clients in the marine and coastal sectors, helping them design, fabricate, and protect steel structures built to last.

Why Marine Environments Are Tough on Steel

Seawater and salt-laden air are highly corrosive. They penetrate coatings, attack welds, and cause galvanic corrosion when dissimilar metals come into contact. Add to that the effects of wind, UV radiation, and constant moisture, and you have one of the most challenging environments for steel performance.

Designing for Durability

To stand up to these conditions, every detail matters — from material choice to how joints are designed.

• Materials: Marine-grade stainless steels, weathering steels, or coated mild steels are commonly used depending on exposure level.
• Design detailing: Avoiding water traps, allowing for proper drainage, and using sacrificial layers can dramatically reduce corrosion risk.
• Protection systems: In submerged or tidal applications, sacrificial anodes or cathodic protection can also help extend service life.

Surface Treatments & Coatings

Effective surface preparation and coating are essential for long-term protection. At our Cornwall facility, we provide shot blasting and industrial painting to the required marine standards.

Our process includes:

• Shot blasting to remove contaminants and create an ideal surface profile.
• Application of high-performance primers, epoxies, and topcoats designed for marine environments.
• Maintenance and touch-up coatings to extend service intervals.

Inspection, Maintenance & Lifecycle Planning

Even the best coatings need maintenance. Regular inspection and cleaning can spot early signs of corrosion before they spread. Depending on exposure, mid-life refurbishment may be required — such as repainting or replacing affected sections — to maintain full protection.

Case in Point: Coastal Fabrication Expertise

Hewaswater Engineering has supplied fabricated steelwork for coastal and marine projects across the South West, including walkways, jetties, and harbour structures. Each project requires tailored coating systems and fabrication techniques to handle long-term exposure to salt and weather. Our experience ensures steelwork performs reliably, year after year.

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Advice for Clients Specifying Marine Steelwork

To achieve lasting results:

• Specify coatings and materials suited to the environmental class.
• Factor in maintenance access during design.
• Involve your fabricator early to ensure practical detailing and protection strategies.

Conclusion: Built to Withstand the Elements

Marine environments demand more from steel — but with the right materials, design, and protection, performance and longevity are achievable.

At Hewaswater Engineering, our expertise in marine and coastal steel fabrication ensures every project is engineered and protected for life in the harshest environments.

If you’re planning a coastal project, contact our team to discuss the best steelwork solutions for your site.