What challenges do steel bridges face from corrosion?

Steel bridges are exposed to some of the most aggressive environmental conditions in the world. Constant moisture, temperature fluctuations, airborne pollutants, de-icing salts and UV radiation gradually degrade protective coatings. Over time, this leads to coating breakdown, bare steel exposure and therefore accelerated corrosion.

Once corrosion begins, it compromises both the structural integrity and the visual appearance of the steel bridges. Steel corrosion left untreated, can result in costly structural repairs, traffic disruption and shortened asset lifespan. For asset owners and local authorities, proactive corrosion treatment for steel bridges is essential to maintain safety, compliance and long-term value.

Why is corrosion treatment critical for extending steel bridge’s lifespan?

Corrosion does not only affect surface appearance; it directly impacts the load-bearing capability of steel structures. As corrosion progresses, steel loses cross-sectional thickness, thereby increasing stress on remaining material and raising the risk of fatigue failure.

An effective corrosion treatment system halts deterioration, protects exposed steel and restores confidence in the structure’s long-term performance. By investing in high-performance protective coatings, bridge owners can significantly extend service life, reduce maintenance cycles and moreover avoid unplanned closures or major refurbishment costs.

The Steel Bridge Corrosion Challenge!

This steel bridge had experienced significant weathering over many years in service. The original protective coating system had broken down in multiple areas, exposing the steel substrate to moisture and oxygen. These vulnerable zones showed early signs of corrosion, particularly in areas subject to standing water, condensation and UV exposure.

The bridge required a comprehensive corrosion treatment solution that would not only restore protection but also deliver a UV-stable finish capable of maintaining colour, performance, and durability in harsh outdoor conditions.

What corrosion treatment solution did Resimac SA provide?

Resimac specified a complete anti-corrosion coating system designed specifically for steel bridge refurbishment. The solution combined surface-tolerant primer technology with a long-term UV-stable topcoat, ensuring both performance and aesthetics.

The system included:

• Thorough cleaning and abrasion of all steel surfaces to remove loose and friable coatings.
• Targeted priming of vulnerable areas using 506 Aluprime.
• A full protective system consisting of two coats of 506 Aluprime and two coats of 508 UVPU applied to all surfaces.

This approach ensured comprehensive protection across the entire structure, even in areas where ideal surface preparation was challenging.

How was the Resimac SA steel bridge corrosion treatment applied?

The refurbishment was carried out by a Resimac Approved Contractor, ensuring correct application and adherence to specifications. All steel surfaces were cleaned and mechanically abraded to remove failing coatings and create a sound edge for recoating.

Following surface preparation, a primer coat of 506 Aluprime was applied to areas most susceptible to accelerated corrosion. Once primed, the full coating system was installed across the bridge, building up a durable, multi-layer protective barrier.

To guarantee quality and compliance, all application work was monitored and inspected by a qualified NACE III coatings inspector, providing assurance that the highest industry standards were met throughout the project.

What is 506 Aluprime and why was it used in this steel bridge corrosion protection solution?

506 Aluprime is a two-component, solvent-based, thin-film epoxy primer designed for manual and mechanically prepared steel surfaces. Its surface-tolerant formulation makes it ideal for refurbishment projects where perfect surface preparation may not always be achievable.

Key benefits of 506 Aluprime include:

• Long-term corrosion protection in C1–C5 corrosive environments.
• Excellent adhesion to steel, even in damp or condensation-prone conditions.
• Low-temperature cure down to 5°C, ideal for UK climates.
• Compatibility with acrylic and polyurethane topcoats.
• Application by brush, roller, or spray.

For steel bridges, 506 Aluprime provides a reliable foundation that arrests corrosion and prepares the surface for long-lasting UV-stable topcoats.

What is 508 UVPU and what role does it play in this steel bridge corrosion protection solution?

508 UVPU is a two-component, solvent-based polyurethane coating designed to deliver a durable, UV-stable finish on steel and concrete structures. When used as part of a Resimac anti-corrosion system, it provides 25 years or more of protection.

Key features of 508 UVPU include:

• Excellent resistance to UV degradation and colour fade.
• A smooth, aesthetically pleasing finish.
• Availability in a wide range of BS and RAL colours.
• Strong resistance to weathering and environmental exposure.
• Suitability for brush, roller, or spray application.

For this steel bridge, 508 UVPU ensured that the refurbished structure would retain both its protective performance and visual appearance throughout its service life.

What products are used in steel bridge corrosion refurbishment?

The corrosion treatment system specified for this project included:

• 506 Aluprime: thin-film, surface-tolerant epoxy primer.
• 508 UVPU: UV-stable polyurethane topcoat.

Together, these products formed a robust, long-term protective system suitable for demanding infrastructure environments such as road and rail bridges.

What were the results and long-term benefits of the Resimac SA corrosion protection solution?

The completed refurbishment restored the steel bridge’s protective coating system, delivering long-lasting resistance to corrosion, moisture ingress and environmental wear. The UV-stable finish ensured that the bridge maintained its specified colour and appearance, even under prolonged exposure to sunlight and harsh weather.

Key benefits included:

• Extended service life of the steel structure.
• Reduced need for frequent maintenance and repainting
• Lower whole-life costs and minimal disruption
• Improved visual appearance and asset value
• Compliance with technical and aesthetic infrastructure requirements

By preventing further deterioration, the project avoided costly structural repairs and helped safeguard the bridge for decades to come.

Why choose Resimac for corrosion treatment of steel bridges?

Resimac delivers proven, high-performance corrosion protection systems designed specifically for infrastructure assets. With advanced coating technologies, approved contractor networks, moreover rigorous inspection standards, Resimac SA provides confidence that steel bridges are protected long term against corrosion, weathering and UV degradation.

For asset owners seeking reliable, durable and cost-effective corrosion treatment solutions, Resimac SA sets the standard for steel bridge protection.

Sustainability Through Durability.

Protecting assets is not just about cost control, it is also about reducing environmental waste. Each time a pump housing or pipeline is repaired rather than replaced, the carbon footprint of your operation decreases.
Resimac’s ceramic epoxy systems contribute to sustainable maintenance practices, reducing the frequency of component replacement and conserving valuable resources.

By extending asset life, you’re also extending environmental responsibility, proof that industrial performance and sustainability can coexist.

Partnering with Resimac SA.

With decades of expertise in polymer engineering, Resimac SA does not just supply coatings, we deliver complete solutions. From on-site evaluations to product selection and application guidance, our team works alongside engineers to ensure that every project achieves the best possible outcome.

We believe in protecting your assets, improving your efficiency, and building a more sustainable future. Ceramic epoxy is not just a coating; it is investment in operational resilience. By combining ceramic hardness with polymer flexibility, Resimac SA’s range of repair and protection systems delivers unmatched performance in abrasion, erosion and corrosion control.

When downtime isn’t an option, choose Resimac SA; your expert partner in industrial asset protection and repair.