Metal Fences are vulnerable to corrosion. Exposure to moisture, pollution, salt, and other environmental factors can cause them to rust over time. This not only affects aesthetics but can also lead to structural weakness if left unchecked.
It is crucial to take proactive measures to protect metal fences in the UK climate. This includes proper coatings, routine maintenance, and following best practices from the initial installation. Addressing early signs of corrosion will ensure your fence remains attractive and sturdy for years to come. Seeking guidance from professionals like fencing Aldershot can provide valuable insights and services to protect your metal fence from the challenges posed by the local climate, ensuring its longevity and durability.
Understanding Metal Corrosion
Several types of corrosion can impact metal fences. Being aware of these mechanisms will help you identify issues early on.
Types of Corrosion
- General corrosion – Uniform metal deterioration occurring over a wide surface area due to chemical reactions. This leads to rust formation and appearance degradation.
- Pitting corrosion – Localized holes or pits that penetrate the metal surface. These pits continue to grow in depth over time.
- Crevice corrosion – Corrosion occurring within narrow gaps between metal parts, often difficult to detect visually.
- Galvanic corrosion – Accelerated corrosion that occurs when two dissimilar metals are in contact in a corrosive electrolyte.
Factors Contributing to Corrosion
Multiple factors influence the rate of corrosion:
- Environmental factors – Moisture, salt, and pollution are all corrosive elements commonly present outdoors. Coastal areas tend to be especially aggressive environments.
- Poor coating or painting – Inadequate paint/coating quality, surface preparation, or application can lead to premature breakdown exposing the metal.
- Scratches and abrasions – Areas where the protective coating is compromised provide a starting point for corrosion.
- Dissimilar metals – When different metal types are in contact, galvanic corrosion can rapidly damage one of the metals.
Preventative Measures
You can minimize corrosion likelihood by starting with fundamentally sound fence design and materials.
Proper Coating and Painting
Paints and coatings provide the first line of defense. The key is proper selection and application:
- Use coating products designed for metal substrates like alkyd, epoxy, or polyurethane types. Consider zinc-rich primers where possible.
- Thoroughly clean and prepare surfaces – remove any existing rust, scale, or failed coatings via scraping, sanding, grinding etc.
- Apply 2-3 coats for sufficient dry film thickness per the manufacturer’s recommendations. Pay special attention to joints, fasteners, edges and other hard-to-reach areas.
- Perform touch up of any damage during routine inspections before corrosion takes hold. Plan full reapplication every 3-5 years.
Galvanization
Galvanized coatings offer long-term corrosion protection by providing a zinc barrier layer.
- The hot-dip galvanization process bonds zinc to the steel substrate providing decades of protection in harsh environments.
- Electroplated zinc coatings are thinner than hot-dip, providing corrosion resistance for several years.
- Galvanization is compatible with most types of iron and steel. It can be used as the sole protection measure or with supplementary painting.
Protective Sealants
Sealants provide an impervious coating preventing moisture penetration:
- Acrylic, polyurethane, and epoxy sealants are well-suited for metals – solvent-based types tend to have better longevity.
- Frequent reapplication is necessary as sealants degrade over time. Every 2-3 years is recommended depending on environment.
- Ensure sealant compatibility – some solvents can interact with certain metal surface finishes. Always test on a small hidden section first.
Routine Maintenance
Preventative maintenance is essential to achieve maximum fence lifespan. This involves proactive inspection paired with prompt action.
Inspection Practices
- Visually inspect all fence surfaces and joints twice yearly – additional monthly inspections for coastal regions.
- Learn to identify early stage corrosion such as faint discoloration, pinpoint pits, bubbles under paint etc. The quicker you address issues, the better.
- Use corrosion detection tools like wire brushes, tapping hammers, ultrasonic thickness gauges etc. where you suspect hidden issues.
Cleaning Procedures
- Remove accumulated dirt, debris and salt deposits during routine inspections using non-abrasive tools – avoid damage to protective coatings.
- Use low pressure water washing, avoiding high-pressure methods which can drive moisture into crevices initiating corrosion.
- Always clean surfaces thoroughly prior to applying new protective paint or sealant layers to ensure proper adhesion.
Frequently Asked Questions
How often should I inspect my metal fence?
- Visual inspections every 6 months are recommended for most areas – ideally during spring and fall when you prepare your property for seasonal changes.
- Increase frequency to monthly in coastal regions due to higher salt and moisture exposure.
Can I use any exterior paint on my metal fence?
- While many paints are formulated for exterior use, not all are suitable for direct metal application – the use of primers and finish coats specifically developed for galvanized steel and iron surfaces is recommended.
- High quality alkyd, acrylic and polyurethane paints from reputable manufacturers such as Rust-Oleum, Krylon, or Hammerite provide excellent and lasting protection.
Is galvanizing suitable for all metal types?
- Hot-dip galvanization properly bonds only with steel or iron – it is not recommended for aluminum, copper or certain alloys.
- For these other metals, alternative barrier protections like anodizing or metal plating must be used instead.
What should I do if I notice corrosion on my fence?
- At first signs of corrosion, thoroughly clean the area with a wire brush and spot apply a zinc-rich touch up paint. This can arrest early-stage corrosion.
- For more advanced corrosion with visible pitting and flaking, consult a professional for possible repairs, treatments or section replacement as needed.
Acting promptly is key to preventing significant spread of damage.
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