How to Protect Metal Structures in Coastal Areas Like the Maresme

Living near the sea offers many advantages, but it also creates significant challenges for any metal element installed outdoors. If you live in the Maresme area or along the Barcelona coastline, you have probably seen how time affects railings, gates, pergolas, doors and other metal structures.

The main cause is salt air. In this article, we explain what it is, why it accelerates corrosion, and what solutions are available to ensure your metal structures last for many years.

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Salt Air: Why the Sea Accelerates Corrosion

Salt air is a combination of moisture and salt particles carried by the wind and deposited on surfaces. These particles contain sodium chloride, which acts as a catalyst for oxidation.

As a result, a metal structure that could remain in excellent condition for decades indoors may begin to show signs of rust after only a few years if it has not been properly protected.

This does not mean that iron and steel are unsuitable for coastal environments. On the contrary, they are highly durable and versatile materials. The key lies in the design, treatment and maintenance of each structure.

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Factors That Affect the Durability of a Metal Structure

Distance from the Sea

A house located 50 meters from the beach is exposed to much harsher conditions than one located several kilometers inland.

Orientation and Exposure

Structures facing the sea receive more wind and salt particles, increasing the risk of corrosion.

Type of Finish

The protective coating system plays a critical role in long-term durability.

Structural Design

Poor drainage, enclosed corners and areas where water accumulates can become corrosion hotspots.

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Protective Finishes That Make a Real Difference

Hot-Dip Galvanizing

One of the most effective solutions for outdoor structures permanently exposed to the elements.

The steel is immersed in molten zinc, creating a uniform protective layer that covers welds and hard-to-reach areas.

Recommended for:

• Metal pergolas
• Fences and enclosures
• Outdoor railings
• Large steel structures

Anti-Rust Primer and Powder Coating

A common solution for gates, railings and decorative metalwork where appearance is also important.

Epoxy Paint for Maintenance

Ideal for restoring existing structures and extending their service life.

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Maintenance: Small Actions That Make a Big Difference

• Clean surfaces regularly to remove salt deposits.
• Inspect welds, screws and joints.
• Apply protective products when needed.
• Repair rust spots as soon as they appear.
• Prevent standing water.

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Signs That a Structure Needs Inspection

• Visible rust.
• Peeling or blistering paint.
• Loss of rigidity.
• Changes in appearance or stability.

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Metal Performs Excellent Near the Sea When Properly Protected

With good design, appropriate anti-corrosion treatments and basic maintenance, metal structures can remain in excellent condition for many years, even just a few meters from the shoreline.

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Protecting Metal Structures in the Maresme, Barcelona and Vallès

At Solbot Ferros, based in Vilassar de Mar, we design, manufacture and maintain metal structures specifically adapted to coastal environments.

If you already have a metal structure exposed to salt air, or you are planning to install a new one, we can help you choose the most durable and suitable solution.