Corrosion protection for steel products

Henning van Wyk, MD of Galvaspin, with finished hot dip galvanized products at the company’s Port Elizabeth plant.Galvaspin, based in Port Elizabeth in the Eastern Cape, has been in business for 16 years, providing corrosion control products and services to the building industry. 

Where steel is used in construction, corrosion control has to be applied, sometimes for aesthetics but, essentially, to prevent weaknesses developing in the structure or product over time. 

Galvaspin provides hot dip galvanizing and thermal metal spraying services. 

Hot dip galvanizing is the process of applying a thin coating of zinc by immersing the steel product in a bath composed primarily of molten zinc. This is an efficient way to protect steel because even if the surface is scratched, the zinc still protects the underlying layer. 

The Galvaspin galvanizing kettle has the capacity to galvanize steelwork up to 2.4m in width and single items up to 5.8m in length, by double end dipping. The company also has a centrifuge plant, the only one of its kind in the Eastern Cape, which enables it to offer its galvanizing services for bolts, chains and small components such as washers, castings, reinforcement rods and fixings. 

Thermal metal spraying involves cover-spraying items with a molten metal application which includes a zinc or aluminium alloy. This process is suitable for large structural elements and other items that cannot be hot dip galvanized. Items to be sprayed are first processed in an abrasive blasting facility, to create a surface profile to which the molten zinc or aluminium will adhere. In most cases a further protective duplex coating system is then applied. This coating system is specifically engineered to protect and prolong the life of the substrate and can also be used to add a finishing colour to the steelwork. 

Henning van Wyk, managing director of Galvaspin, says product quality is essential in the company’s operations and all its work is carried out to SABS SANS 121: 2000 specifications. Galvaspin is SABS-approved and is a member of the Hot Dip Galvanizers Association of Southern Africa and the International Thermal Spray Association.

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