US 12,486,578 B2
Process for improving characteristics of galvanized surfaces
Derya Tabak, Bursa (TR); Aydin Ersoy, Bursa (HU); Mehmet Gul, Bursa (TR); and Mehmet Koroglu, Bursa (TR)
Assigned to BORCELIK CELIK SAN. TIC. A. S., Bursa (TR)
Appl. No. 18/028,766
Filed by BORCELIK CELIK SAN. TIC. A. S., Bursa (TR)
PCT Filed Apr. 8, 2021, PCT No. PCT/TR2021/050326
§ 371(c)(1), (2) Date Mar. 28, 2023,
PCT Pub. No. WO2022/081107, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 2020/16196 (TR), filed on Oct. 12, 2020.
Prior Publication US 2023/0332294 A1, Oct. 19, 2023
Int. Cl. C23C 22/30 (2006.01); C23C 2/26 (2006.01); C23C 2/40 (2006.01); C23C 22/10 (2006.01)
CPC C23C 22/10 (2013.01) [C23C 2/26 (2013.01); C23C 2222/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.