METHOD FOR PRODUCING A SHEET STEEL PRODUCT PROTECTED AGAINST CORROSION

摘要

The invention relates to a cost-saving production of steel sheets protected against corrosion and exhibiting good use-related properties for determined applications. For this purpose, the inventive method for producing a sheet steel product protected against corrosion consists in electrolytically applying a coating zinc-containing layer to the sheet steel product, if necessary, in mechanically and/or chemically cleaning said product, in immediately applying a second magnesium-based coating layer to the cleaned coating zinc-containing layer by vapour-phase deposition and, after applying said second layer, in subsequently heat-treating the coated sheet steel product at a normal atmosphere and a processing temperature ranging from 320 to 335 °C in such a way that a diffusion or convection layer is formed between the coating zinc-containing and magnesium-based layers.