What Causes Corrosion in Solar Mounting Structures? Prevention Tips You Need to Know

Corrosion of solar mounting systems is a major concern for both residential and commercial PV installations. If left untreated, it can severely impact the structural integrity and efficiency of solar power plants. This article explores the main causes of corrosion and effective strategies to prevent it, ensuring long-term stability and safety.

What Is a Solar Mounting System?

A système de montage solaire (also known as a racking system) is the structural framework that holds solar panels in place. These racks ensure panels are set at the right angle et orientation to optimize sunlight capture. They are used in various settings:

• Ground-mounted solar farms
• Agricultural fields
• Rooftops (metal, tile, flat)
• Carports and parking areas

👉 Explore our Système de montage solaire au sol for utility-scale solutions.

Why Do Solar Mounting Frames Rust?

Age-Related Material Degradation

Over time, exposure to rain, snow, UV rays, and temperature shifts can deteriorate metal surfaces, especially if maintenance is neglected.Installation in Coastal or Salt-Affected Zones

Areas near the sea face salt corrosion. The salt particles in the air and rain aggressively degrade unprotected steel structures.

Example from Japan: Many coastal PV systems in Japan experience accelerated wear due to high salt concentration in the air, especially in regions like Okinawa or Chiba.

Galvanic Corrosion Between Dissimilar Metals

When two different metals (like aluminum and stainless steel) come into contact with moisture, one metal becomes anode and corrodes faster.

Improper Ground or Foundation Preparation

If a structure is built on soil with high acidity or without anti-corrosion insulation, the metal may rust from the bottom up.

Five Proven Ways to Prevent Rust on Mounting Systems

Use Compatible Metals

Avoid mixing metals that react with each other. Stick with the same metal or use non-conductive spacers to prevent galvanic corrosion.

👉 Compatible components like our Stainless Steel Solar Panel Grounding Clips help maintain electrical isolation.

Choose Rust-Resistant Materials

Use materials with natural or treated corrosion resistance, such as anodized aluminum or hot-dip galvanized steel.

• Example: Our C - Montage au sol en acier - Fondation en pieux vissés features corrosion-treated surfaces ideal for challenging environments.

Apply Protective Coatings

Anti-rust coatings or zinc-rich primers significantly slow down the oxidation process.

Avoid Installing in High-Salinity Areas

Where possible, avoid placing systems in heavy salt-damage regions unless using specialized anti-corrosion structures.Regular Inspections and Maintenance

Partner with a provider that offers scheduled inspections to detect early signs of corrosion or wear.

Consequences of Unchecked Corrosion

• Structural failure under wind or snow load
• Panel misalignment, leading to energy loss
• Increased maintenance costs or full system replacement
• Electrical hazards from weakened grounding paths

Recommended Rust-Resistant Products

To safeguard your investment, choose mounting systems with built-in anti-corrosion features. Here are a few examples:

• 🧱 Aluminum Ground Mount – Screw Pile Foundation
• 🧩 HDPE Plastic Solar Ballast Mounting System
• 🛠️ Hot Dip Galvanized C-shaped Steel Support Bracket

Final Thoughts

By understanding why solar racking structures rust and taking steps to prevent it, you can significantly extend the life of your solar PV system. Smart material choices, regular maintenance, and expert guidance are key.

For durable, corrosion-resistant solar mounting solutions, choose Firstsolar — your reliable global supplier.