1. Technical Field
The present disclosure generally relates to methods for anodizing and dyeing metallic articles.
2. Description of Related Art
Metallic articles, such as articles made of aluminum/aluminum alloy, magnesium/magnesium alloy, and titanium/titanium alloy, are usually applied with an anodizing treatment, such that anodization layers are formed on the surfaces of the metallic articles to protect the metallic articles. To provide a color to the metallic articles to appear more colorful, after the anodizing treatment, the metallic articles may be applied with a dyeing treatment or a painting treatment. However, the color of the metallic article obtained may be in only one color, and also cannot produce a gradual color change or color gradient appearance.
Therefore, there is room for improvement within the art.
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numerals are used throughout the drawings to refer to the same or like elements of an embodiment.
Referring also to
In step S101, the workpiece 100 is applied with one or more pre-anodizing treatments, for smoothing and texturing the decorated surface 10, and/or removing grease residues or a native oxide layer on the decorated surface 10. The one or more pre-anodizing treatments may include one or more of polishing, texturing, degreasing, alkaline etching, and desmutting. A degreasing solution used for performing degreasing of the grease residues is a weak alkaline solution, such as sodium pyrophosphate solution. An alkaline etching solution used for alkaline etching is a strong alkaline solution, such as a sodium hydroxide solution. A desmutting solution used for desmutting is a strong acid solution. Examples of polishing may include chemical polishing or mechanical polishing. Examples of texturing may include sandblasting or wiredrawing.
In step S102, the workpiece 100 is anodized by an anodizing treatment, such that an anodization layer 20 is formed on the decorated surface 10. The anodization layer 20 is porous having a plurality of holes 30 therein. The holes 30 have a substantially uniform depth (referring to
In step S103, the workpiece 100 is sealed by a first sealing treatment in a first sealing solution 200. During the first sealing treatment, a contacting time (duration) of the anodization layer 20 and the first sealing solution 200 gradually changes along a predetermined direction, such that the depth of the holes 30 gradually changes along the predetermined direction after the first sealing treatment. In the illustrated embodiment, referring to
In step S104, the workpiece 100 is colored by a dyeing treatment. In the dyeing treatment, a coloring agent enters into the holes 30 to dye the decorated layer 10. Because the depth of the holes 30 decreases gradually along the predetermined direction, an amount of the coloring agent entering into the holes 30 thereby decreases gradually along the predetermined direction. Thus, the anodization layer 20 is colored with a gradual changing color or color gradient.
In step S105, the workpiece 100 is sealed by a second sealing treatment in a second sealing solution (not shown). In the second sealing treatment, the workpiece 100 is immersed into the second sealing solution to seal the holes 30, such that the anodization layer 20 has a good wear resistance.
In step S106, the workpiece 100 is dried by heating.
In other embodiments, if the workpiece 100 is cleaned or a texturing effect is not needed, step S101 can be omitted. Step S105 can be omitted if a required wear resistance of the workpiece is low. Step S106 can be omitted if desired, and the workpiece can be air dried instead.
The contacting time of the anodization layer 20 and the first sealing solution 200 changes gradually along the predetermined direction, such that the depth of the holes 30 after the first sealing treatment changes gradually along the predetermined direction, and the amount of the coloring agent 40 entering into the holes 30 during the dyeing treatment thereby changes gradually along the predetermined direction. Thus, the anodization layer 20 after the dyeing treatment has a gradual changing color or color gradient. The above-described method for anodizing and dyeing a metallic article is easy to control, and thus is suitable for mass production.
Depending on the embodiment, some of the steps being described may be removed or eliminated, while other steps may be added, and the sequence of steps may be changed. It is also to be understood that the description and the claims drawn to a method may include some indication in reference to certain steps. However, the indication used is only to be viewed for identification purposes and not as a suggestion as to an order for the steps.
It is to be understood, however, that even through numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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201210077768 | Mar 2012 | CN | national |
Number | Name | Date | Kind |
---|---|---|---|
4130466 | Kramer | Dec 1978 | A |
4756771 | Brodalla | Jul 1988 | A |
5250173 | Jozefowicz | Oct 1993 | A |
5820740 | Le | Oct 1998 | A |
20070028402 | Matsuoka | Feb 2007 | A1 |
20120015172 | Gao | Jan 2012 | A1 |
20130224406 | Chang | Aug 2013 | A1 |
20130248373 | Shen | Sep 2013 | A1 |
Number | Date | Country | |
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20130248372 A1 | Sep 2013 | US |