The benefits of hot dip galvanised steel fencing | Blog | Jacksons Security Fencing

2023-03-23 17:08:00 By : Ms. Christina Zheng

Security fencing for all applications, including vertical bar, welded mesh, metal railings, sports fencing, playground fencing and GRP. 

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At Jacksons our entire resource is geared around meeting your needs from sales to design site visits manufacturing and transport so please feel free to contact us to discuss your requirements at the earliest stage of the project.

We have teams located at each of our three fencing centres and fencing managers located throughout the UK ready to respond to your enquiry.

With a vast amount of experience providing fencing for many applications, we share advice from our industry knowledge about keeping a site safe and secure, product detail and information for architects, specifiers, contractors and end-users.

It’s estimated that up to 4% of the world’s GDP is lost through corrosion each year. When installing a steel fence, rust prevention should always be a key consideration; the materials and methods used will have a major impact on the longevity of your fence.

One of the best ways of protecting against corrosion is hot-dip galvanisation: a process in which the entire fence surface is dipped into molten zinc, coating it completely. This provides a barrier protection between the metal and its surrounding environment.

Without protection, steel will rust over time due to atmospheric conditions, with the degree of corrosion depending on the environment that the product is in. Steel is made mainly from iron and the rust is an iron oxide (typically a red oxide) which is formed by the reduction and oxidation reaction of iron and oxygen, in the presence of moisture.

Galvanisation is highly effective in preserving your fence because the corrosion of zinc, which protects the base metal, is very slow. A deep scratch in the surface of the zinc will expose the underlying metal; a galvanic cell is formed at this location, around which the zinc corrodes but still protects the metal – a process known as cathodic protection. The zinc acts as an anode and provides free electrons, sacrificing its ions and keeping the less active metal underneath from rusting. A zinc coating therefore provides ‘sacrificial protection’.

Other protective methods include painting or plastic coating, but these have serious flaws if used as the only method of protection and being applied directly to the steel substrate. When damaged, these inferior coatings can fall away, making them unreliable and in need of constant maintenance.

The galvanising process has a number of stages, all by immersion, that are required to achieve the final finish:

Acid or alkaline-based proprietary products may be used and they may be heated or used at ambient temperatures.

This is done in dilute hydrochloric acid which dissolves rust and produces a chemically clean surface.

A mixture of zinc chloride and ammonium chloride in solution is the standard agent of choice. The steelwork must be dry on completion of this stage.

The final stage involves the clean metal being immersed in a special bath of molten zinc at 450°C where the zinc alloys with the iron in the steel to form zinc/iron alloy layers. These layers are the basis of the coating.

At Jacksons Fencing, polyester powder coating can be applied if required after galvanising to protect the steel from rusting which allows the steel to not peel off with the paint still stuck to it. For installations near coastal areas, a marine coating can ensure that moisture does not get through to the galvanising below, helping to protect the finished product.

Even in cases where the initial cost of galvanising is higher than alternative coatings, galvanising is always cheapest in the long term because it lasts longer and doesn’t require constant care.

Galvanising offers complete coverage, sealing the base metal and stopping corrosion for good, eliminating the need for continual maintenance. The long-term durability is achieved at relatively low environmental burden.

Galvanising provides maximum protection through a tough, abrasion-resistant coating of increased thickness.

The lifespan of a zinc coating is largely determined by its thickness.

For more information on our steel security fencing, click here.

Jacksons Fencing have a large range of related products, all complete with our 25 year guarantee. If you cannot find the item you are looking for, please do not hesitate to call our friendly sales team.

We have completed a large number of projects in various sectors, from housing, retail, leisure and education, to hospitals and healthcare, transport, utilities, and high security NPSA (previously CPNI) sites. Discover more through our portfolio of case studies.

We have an extensive library of blogs covering a wide selection of topics, whether you need a helpful guide for recognising accreditations, an understanding of different processes such as galvanisation, or specialist advice on securing a rural site against crime.

From design and manufacturing to supply and installation, we can help you with your project. If you'd like to discuss anything in this article or need information or guidance, please feel free to contact us at any stage to discuss your requirements.

© Jacksons Fencing 2023 | Stowting Common Ashford | Kent TN25 6BN | T: +44(0)1233 750393 | F: +44(0)1233 750403 security@jacksons-fencing.co.uk

© Jacksons Fencing 2023 | Stowting Common Ashford | Kent TN25 6BN | T: +44(0)1233 750393 | F: +44(0)1233 750403 security@jacksons-fencing.co.uk

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