Surface modification of a zinc-based metal coating in a hot-dip coating process
AssigneeThyssenKrupp Steel Europe AG
InventorsFabian Junge, Burak William Centinkaya
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Abstract
A striplike or sheetlike steel substrate is hot-dip-coated with a metallic coating based on zinc and has a modified surface. A method includes producing a semifinished product with modified surface. The method includes at least regionally modifying the surface of a coated, skin-pass-rolled, oiled and cleaned metallic steel substrate by an atmospheric-pressure plasma treatment of surface regions with oxygen, air, forming gas or a mixture of two or more of these gases as process gas.
Claims14
A striplike or sheetlike steel substrate hot-dip-coated with a metallic coating based on zinc, with an at least regionally plasma-treated modified surface, which in a surface-located atomic monolayer has surface modifications in the form of round, zinc-rich local fused regions having funnellike depressions in the form of impact craters formed by impact of energetic particles due to kinetic energy and having a diameter of 30-300 μm, wherein the surface modifications comprise a minimum number of 20 surface modifications per mm2.
A striplike or sheetlike steel substrate hot-dip-coated with a metallic coating based on zinc, which in the surface topography has surface modifications having funnellike depressions in the form of impact craters formed by impact of energetic particles due to kinetic energy and having a diameter of 0.2-30 μm as determined via SEM micrograph, wherein the surface modifications comprise local fused regions including a minimum number of 20 surface modifications per mm2.
Dependencies are inferred from the claim text.