Industrial Painting | Cape Galvanising Consolidated (Pty) Ltd

By: Cape Galvanising Consolidated  11-11-2011
Keywords: Corrosion Resistance, Salt Spray

Industrial painting can be applied to various structures that can be abrasively cleaned in our blasting cabin (size 5m x 5m x 30m long).  Painting is only done on a SA2½ or SA3 blast cleaned surface.  It is essential to blast before painting, because the removal of all rust and mill scale is of paramount importance in providing a long-term corrosion resistance system.

Various paint systems may be used, including inorganic and organic zinc rich primers and zinc phosphates, epoxies, epoxy tars, alkyds, acrylics, vinyl, enamels and polyurethanes.

Painting is done under cover to ensure that the blasted surface does not rust prior to painting.  Blasted surfaces can begin rusting or become contaminated within 4 hours, even when they are under cover. Outside, the clean steel starts to rust immediately, especially if humidity levels are high.

The overall quality of painting under cover is far greater due to less interference from the wind, dust, rain, salt spray and general contamination from the environment.  This ensures that the specified thickness is achieved within the required time span and that the paint cures without accumulation of dirt and dust in the coating.

Site painting should never be carried out if the surface can be contaminated prior to applying the final coat.  Final coats should be applied in the factory and touch-ups done on the site.

Keywords: Corrosion Resistance, Salt Spray

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