Back to results
US 12,486,578 B2Granted
Process for improving characteristics of galvanized surfaces
AssigneeBorcelik Celik San. Tic. A. S.
InventorsDerya Tabak, Aydin Ersoy, Mehmet Gul, Mehmet Koroglu
Life of this patent
Estimating the term…
Abstract
A method of surface treatments that provide additional characteristics to the surfaces of galvanized steel materials is provided. A chromate-free coating material is applied after texturing on the surface of the galvanizing steel material and obtaining the roughness values. The resulting galvanized steel material provides a stainless-steel alternative sheet materials with high corrosion resistance and anti-fingerprint characteristics.
Claims20
A method of surface treatment for galvanized sheet materials to provide a stainless-steel appearance, comprising the following steps:
- applying a skin pass mill (SPM) process to a galvanized steel sheet material with textured SPM rollers having a crown of 0.02 mm to 0.08 mm, producing a desired roughness of between 2.90 μm Ra to 5 μm Ra on the galvanized steel sheet material;
- applying a coating material that stabilizes the texture surface of the galvanized steel sheet material that reaches the desired roughness,
- wherein the coating material comprises chromium nitrate, chromium phosphate, methanol, ethanol, and nitric acid;
- and wherein the coating material does not comprise chromate.
1 more element
Dependencies are inferred from the claim text.