US 11,866,838 B2
Method for creating colorful pattern on metal surface
Chen-Kuei Chung, Tainan (TW); Chin-Jou Kuo, Tainan (TW); and Wei-Hsuan Lin, Tainan (TW)
Assigned to National Cheng Kung University, Tainan (TW)
Filed by NATIONAL CHENG KUNG UNIVERSITY, Tainan (TW)
Filed on May 20, 2021, as Appl. No. 17/325,519.
Prior Publication US 2022/0372645 A1, Nov. 24, 2022
Int. Cl. C25D 11/12 (2006.01); B41M 5/00 (2006.01); C25D 11/10 (2006.01); C25D 11/24 (2006.01); C25D 11/08 (2006.01)
CPC C25D 11/12 (2013.01) [B41M 5/0011 (2013.01); B41M 5/0023 (2013.01); B41M 5/0058 (2013.01); C25D 11/08 (2013.01); C25D 11/10 (2013.01); C25D 11/24 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for creating colorful patterns on a metal surface comprising the steps of:
Step one: carrying out a first anodizing process on a metal substrate to form a first anodic oxide layer on a surface of the metal substrate;
Step two: subsequent to the first anodizing process, coating, by a printing machine, a layer of a colorless ink devoid of color defining agents on the first anodic oxide layer on the surface of the metal substrate to form a colorless ink pattern mask, wherein the first anodic oxide layer is sandwiched between the metal substrate and the colorless ink pattern mask;
Step three: performing a second anodizing process to form a second anodic oxide layer on a part of the first anodic oxide layer on the metal substrate not covered with the colorless ink pattern mask;
Step four: removing the colorless ink pattern mask; and
Step five: coating a metal film on a surface of the first anodic oxide layer and a surface of the second anodic oxide layer.