You do not need to be a chemist to work with metal, but there is one concept worth understanding because it causes real damage in construction and fabrication: galvanic corrosion. When two different metals come into contact in the presence of moisture, they can create a small electrochemical reaction. In simple terms, they form a battery, and the more active metal begins to corrode faster than normal.

When this happens inside a joint, the problem can go unnoticed until fasteners begin to fail. Planning ahead and seeking advice from an industrial fastener supplier can avoid this.

Which Metal Combinations Cause Problems

Some combinations are more prone to galvanic corrosion than others. Aluminium and steel are a common example. When moisture is introduced, the aluminium tends to corrode more quickly. Copper and steel can also be a problem pair, except in that case the steel is usually the one that suffers.

The tricky part is that physical strength does not equal chemical resistance. Steel is one of the toughest structural materials used in construction, yet it is highly vulnerable to rust and galvanic attack. Copper is softer, but far more resilient in wet conditions, which is why it remains common in plumbing and marine applications.

Use Matched Metals Where Possible

The simplest way to prevent galvanic corrosion in fasteners is to pair similar metals together. Specific stainless steel bolts and products from a stainless steel fastener supplier are a straightforward example. When the metals are the same or close to each other on the galvanic scale, the reaction is greatly reduced or avoided altogether.

This is not always possible on every project, but it is the cleanest solution when the application allows it.

Barriers and Protective Coatings Can Help

When dissimilar metals must be used together, introducing a non-conductive barrier can break the electrical path that drives the reaction. Plastic washers, insulating sleeves, isolating compounds and foam tape all help keep metals separated.

Galvanised fasteners are another common solution. Galvanising adds a zinc coating over the steel, which acts as both a barrier and a sacrificial layer. In other words, the zinc corrodes first, helping protect the metal beneath.

Protective coatings are not magic, but they can make a big difference when matched to the right environment.

Moisture Control Still Matters

No moisture means no electrolyte, and without that, galvanic corrosion struggles to start. In practice, completely keeping water out is not always realistic, but thoughtful design can still reduce the risk. Sealing joints, directing drainage properly and using suitable sealants from a reputable silicone sealant supplier can all help limit long-term exposure.

At Bricon Industries, we help customers choose bolts, fasteners and materials that work together without creating hidden corrosion problems. If you are selecting products for a new job, replacing failed fixings or trying to work out what went wrong, contact our team. A quick conversation can save you a lot of trouble later.