News — zinc rich galvanize coating

Zinc Rich Paint versus Hot Dip Galvanising Written by AZoM For many years, there has been debate over the relative merits of zinc rich paint and hot dip galvanizing. There has also been debate within the paint industry about the relative merits of one type of zinc rich paint compared to another. This has generated a degree of confusion with end users of these corrosion prevention products as much of the information requires interpretation or may, in fact, be misleading. Making Valid Performance Comparisons Hot dip galvanised coatings have been widely used for nearly 150 years. The technology involved in their...

Zinc painting, commonly referred to by the misnomer cold galvanizing, is the application by brush or spray of zinc dust mixed with organic or inorganic binders. Prior to application, the steel must be cleaned by sand blasting to near white metal (SSPC-SP 10), commercial blast cleaning (SSPC-SP 6) or white metal (SSPC-SP 5). The zinc dust must be mixed with a polymeric-containing vehicle and constantly agitated during application to produce a homogenous mixture and proper adhesion.  Zinc-rich paints contain 65-95% metallic zinc in dry film, with 92-95% being common.The paints can be brushed or sprayed on to the steel. When...