At BS Fixings, we’re passionate about providing top-quality fixing and fastening solutions, and a significant part of our expertise lies in our range of galvanised steel products. As specialists in the DIY and construction sector, particularly stainless steel, we’re excited to share our knowledge about galvanisation. In this blog, we’ll explore the galvanising process, its benefits, and why it’s a smart choice for anyone in the DIY and construction industry.

What is Steel Galvanising?

Steel galvanising is a process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanising, where steel parts are submerged in a bath of molten zinc.

The Hot-Dip Process: Step-by-Step

  1. Surface Preparation – the steel is thoroughly cleaned to remove all impurities. This can involve degreasing, pickling, and fluxing.
  2. Dipping – the clean steel is then immersed in a bath of molten zinc at around 450° The zinc reacts with the steel to form a tightly bonded alloy coating.
  3. Finishing – after removal from the zinc bath, the steel is cooled, either by air or quenching in water. This causes a reaction, forming zinc oxide, which then reacts with carbon dioxide to create zinc carbonate, the final protective coating. Hot-dip galvanisation is economical and can be used on various steel shapes.
  4. Inspection – finally, the galvanised steel is inspected for thickness, appearance, and adherence to international standards.

Other Galvanisation Processes

Galvannealing

This process combines hot-dip galvanising and annealing. Steel is first hot-dipped, then heated to allow the zinc coating to alloy with the steel, resulting in a matte grey finish. Galvannealed steel is weldable and offers an excellent surface for paint adhesion.

Pre-Galvanising

Similar to hot-dip galvanising, this process is done at the initial production stage. It involves rolling the metal through a cleaning agent, then through a molten zinc bath, and immediately recoiling it. This method allows for rapid, large-scale galvanisation with a uniform coating.

Electrogalvanising

Unlike other methods, electrogalvanising does not involve immersing the steel in molten zinc. Instead, an electric current is applied to an electrolyte solution containing zinc ions, which are then deposited onto the positively charged steel. This process is typically performed at the early production stages.

Advantages of Galvanised Steel

galvanised steel wall studs galvanised fixings galvanised car brake disc

From construction beams to fencing, and automotive parts to outdoor furniture, galvanised steel is versatile and reliable. Its application in the construction industry is particularly significant, offering a combination of strength and protection that is unmatched.         

  • Longevity – galvanised steel has an incredibly long life expectancy, often exceeding 50 years in rural environments and 20-25 years in severe urban and coastal exposure.
  • Toughness – the galvanised layer offers robust protection against physical damage.
  • Complete Coverage – every part of the steel is coated – inside and out, including sharp edges and hard-to-reach crevices.
  • Easy Inspection – the nature of the process makes it easy to inspect for coating thickness and continuity.
  • Cost-effective – despite its durability, galvanising is a surprisingly cost-effective method for protecting steel. Hot dip galvanising proves to be more economical over time due to its longevity and reduced maintenance requirements.

Why Choose Galvanised Steel for Construction and DIY Projects?

Here at BS Fixings, we stock hundreds of steel products, including galvanised variants. From wall ties and wire to banding and nails, our range of galvanised products will enable you to carry out your tasks successfully, and here’s why:

  • Resistance to Corrosion – galvanised steel stands up exceptionally well against environmental elements, including moisture and pollutants, significantly reducing the risk of rust.
  • Enhanced Durability – it’s an ideal choice for outdoor or high-moisture environments, where longevity and strength are key.
  • Maintenance-free – steel requires little to no maintenance as the galvanised coating creates a permanent bond, preventing shrinkage and cracking. This therefore saves you time and money in the long run.
  • Sustainability – galvanised steel is environmentally friendly. It’s 100% recyclable and does not lose any of its properties during the recycling process.
  • Aesthetic Appeal – galvanised steel has a sleek, modern look that is increasingly popular in contemporary architecture and design. The hot dip galvanisation process creates a smooth surface that is free from defects like black spots and rust stains, improving its look whilst also offering complete protection to the steel underneath.       

Choosing the Right Galvanised Product

Whether you’re looking for fasteners for a specific project or need guidance on the best galvanised solution, our team is here to help. We pride ourselves on our expertise and our commitment to quality in every product we sell, so please don’t hesitate to get in touch if you require further assistance.

Understanding the importance of galvanised steel is crucial for anyone involved in construction or DIY projects. Its combination of durability, cost-effectiveness, and environmental friendliness makes it an excellent choice for a wide range of applications.

We hope this guide has been informative and helpful. For more information about our galvanised steel products or to discuss your specific needs, please browse our website or contact our expert team. Call us on 03330 117818 or email info@bsfixings.co.uk and we will be happy to help!