Steel infrastructure in Africa faces relentless challenges from corrosion due to harsh environmental conditions. From coastal structures to industrial and mining sites, the need for durable and cost-effective solutions is critical. Zinc metal coating, also known as zinc thermal spraying, has emerged as a proven method for long-term corrosion protection. This innovative technique not only extends the lifespan of steel assets but also significantly reduces maintenance costs and lifecycle expenses.

What is zinc metal coating?

Zinc metal coating, or zinc thermal spraying, is a process where zinc wire is melted using a specialised spray gun powered by either a flame or an electric arc. The molten zinc is then sprayed onto prepared steel surfaces, creating a durable, corrosion-resistant barrier. This method is particularly effective for protecting large or complex steel components that are exposed to harsh environments.

Key benefits of zinc metal coating corrosion protection

• Durable corrosion barrier: Zinc coating forms a robust protective layer that shields steel from environmental damage.
• Sacrificial protection: Even if the coating is scratched, zinc continues to protect exposed steel through sacrificial corrosion, ensuring long-term durability.
• Versatile application: Ideal for a wide range of structures, including bridges, transmission towers, marine facilities, industrial plants, and mining infrastructure.
• Cost-effective lifecycle management: By minimising maintenance needs, zinc metal coating reduces long-term repair and replacement costs, making it a cost-effective solution.

Why zinc metal coating is essential for african steel infrastructure

Africa’s diverse and often extreme climates make steel infrastructure particularly vulnerable to corrosion. Coastal areas face high humidity and salt exposure, while industrial and mining sites are exposed to harsh chemicals and pollutants. Zinc metal coating directly addresses these challenges by providing a reliable, long-lasting solution that reduces the need for frequent maintenance and extends the lifespan of critical assets.

Expert insight on zinc metal coating

Simon Norton, Director of the International Zinc Association (Africa), emphasises the importance of zinc metal coating:
‘Zinc metal coating provides long-lasting corrosion protection for steel structures that are often difficult or costly to maintain. It is particularly valuable for infrastructure expected to deliver decades of reliable service under demanding conditions.’

When to choose zinc thermal spraying

Zinc metal coating is the ideal choice for:

• Assets requiring reduced maintenance: Minimises lifecycle costs by reducing the frequency of repairs and replacements.

• Large-scale or complex steel components: Perfect for structures with intricate designs or large surface areas.

• Coastal or industrial locations: Provides superior protection against salt, humidity, and industrial pollutants.