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How a centrifuge galvanising facility works

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article image Korvest’s centrifuge galvanising process is ideally suited for small cast products

Korvest Galvanisers offers the services of their centrifuge galvanising facility for all small and complex steel components.

Often referred to as spin galvanising, the centrifuge galvanising process offers comprehensive corrosion protection treatment of small or intricate steel components by mechanically spinning them during the galvanising process. Particularly useful for threaded components or products such as clips, hinges or bolts that need to slot together, the process involves galvanising pre-treated steel components in spinning baskets that are rotated at a high speed after withdrawal from the molten zinc, preventing excess zinc from settling on the surface of the component, thereby maintaining a clean, even surface.

Similar to hot dip galvanising in terms of the chemical preparation and actual process, centrifuge galvanising starts with a caustic and acid treatment to remove any organics and oxides, followed by cleansing and the addition of a zinc ammonium chloride layer to the products using a hot flux treatment.

When the actual hot dipping takes place, a specific number of products are loaded in specific patterns into the centrifuge spinning basket, allowing for adequate movement of molten zinc around products during the spinning process. This ensures only the necessary amount of zinc remains on the products.

The Korvest Galvanisers Spin Plant is fully automated, and precisely controlled ensuring consistent processing times and conditions for long runs of similar products. Korvest’s ceramic lined kettle holds 95Tn of molten zinc, offering a thermal buffer should it be needed for heavier products.

Ideally suited for small cast products, the galvanising process has stringent quality checks in place with careful monitoring of the final coating thickness and coverage of products being galvanised. Centrifuge galvanised steel carries a dull matte but even appearance.

Korvest’s centrifuge galvanising process is completed to meet AS4680:2006.

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