TW201518036A - Surface treatment method of metal product - Google Patents

Abstract

A surface treatment method of metal product is provided. The metal product is made of material mainly comprising aluminum. The metal product comprises a convex face. The surface treatment method comprises steps of: implementing rough polishing treatment for the metal product surface to form a first process surface; implementing fine polishing treatment for the first process surface of the metal product located at the partial region of the convex face to form a second process surface; forming a patterned blocking layer on the second process surface; implementing chemical polishing treatment for the metal product surface to uniform the surface roughness of portions of the first process surface and the second process surface that are not covered by the patterned blocking layer; and removing the patterned blocking layer, and the metal product surface having a mirror area corresponding to the patterned blocking layer and a non-mirror area outside the mirror area.

Description

Surface treatment method for metal products

The present invention relates to a surface treatment method, and more particularly to a surface treatment method for a metal article having a convex surface.

Generally, when the surface of the metal product is mirror-polished, the surface polishing using the dry cloth wheel can only remove the pits on the surface of the metal product and the deep processing lines, and will form fine lines on the surface, so the wet plane is needed later. The polishing machine removes the polishing fine lines formed on the surface of the metal product after polishing through the dry cloth wheel, so that the surface of the metal product is mirror-finished.

Referring to FIG. 1 , a conventional planar polishing machine 9 mainly has a rotating platform 91 , a polishing pad 92 detachably fixed to the rotating platform 91 , and a clamping method for clamping a metal product 1 . With 93. The polishing process is to drive the metal article 1 to press the polishing pad 92 by the clamping jig 93, so that the metal product 1 is sunk on the polishing pad 92 and the surface contacts the polishing pad 92; then the rotating platform 91 is driven to rotate to soften the polishing pad. The pad 92 rubs the surface of the metal article 1 to polish the surface into a mirror surface.

However, the above-described planar polishing machine 9 is applied to the surface polishing treatment of the metal article 1 having a convex surface, which is caused by the fact that when the metal article 1 having a convex surface is pressed down to the flat polishing pad 92, The contact area of the surface of the metal product 1 with the polishing pad 92 is limited.

Therefore, if a mirror pattern is to be formed on the surface of the metal product 1 which is convex, the mirror polishing process on the surface of the metal product 1 needs to be improved to solve the above-mentioned process limitation of the plane polishing machine 9 for the non-planar surface of the polishing surface. Subsequent problems caused by incomplete surface polishing, such as the surface of the metal product 1 after polishing through the plane polishing machine 9 and the polishing without the surface polishing machine 9 have obvious boundaries due to different roughness, in order to metal products 1 The surface forms a pair of mirror areas (not shown) which should be mirror-patterned and a non-specular area (not shown) outside the mirror area, the mirror area having a different surface roughness than the non-specular area.

Accordingly, it is an object of the present invention to provide a surface treatment method for an improved metal article.

Therefore, the surface treatment method of the metal product of the present invention, the metal product, for example, may be made of an aluminum-based material, and the metal product has a convex surface, and the surface treatment method comprises the following steps: performing the surface of the metal product a rough polishing process to form a first processed surface; a portion of the first processed surface of the metal article is polished in a portion of the convex portion to form a second processed surface; and a patterned barrier layer is formed on the second processed surface Performing a chemical polishing treatment on the surface of the metal product such that the first processed surface and the second processed surface are not masked by the patterned barrier layer The surface roughness of the portion is uniformized; and the patterned barrier layer is removed, the surface of the metal article having a pair of mirror regions to be patterned barrier layers and non-specular regions outside the mirror regions.

The effect of the present invention is to form a non-mirror region located on the surface of the metal surface and the mirror surface outside the mirror surface via the steps of the surface treatment method described above to complete the fabrication of the mirror pattern (the mirror region). And wherein the surface roughness of the portion of the second processing surface located in the non-specular area and the first processing surface is homogenized by chemical polishing to remove the difference in roughness between the first processing surface and the second processing surface The obvious boundary is to solve the subsequent problems caused by the incomplete surface mirror polishing of the aluminum product.

1‧‧‧Metal products

10‧‧‧ convex face

11‧‧‧First processing surface

12‧‧‧Second processing surface

13‧‧‧Mirror area

130‧‧‧ holes

131‧‧‧pattern mirror face

132‧‧‧ text mirror face

133‧‧‧Oxide film layer

14‧‧‧Non-mirror area

2‧‧‧patterned barrier

21‧‧‧The Department of Patterns

22‧‧‧Text Department

3‧‧‧Block

4‧‧‧Colored layer

5‧‧‧Protective layer

9‧‧‧Plane polishing machine

91‧‧‧Rotating platform

92‧‧‧ Polished cushion

921‧‧‧Sag

93‧‧‧Clamping fixture

Other features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings, wherein: FIG. 1 is a schematic diagram illustrating a conventional planar polishing machine for a metal article having a convex surface. Mirror surface polishing treatment; FIG. 2 is a perspective view showing a surface of the metal product according to a preferred embodiment of the present invention, the surface of the metal product is formed into a first processing surface by rough polishing; FIG. 3 is a perspective view illustrating The metal article is formed into a second processed surface by a fine polishing process; FIG. 4 is a schematic view showing the first preferred embodiment for finely polishing the metal article using a flat polishing machine having a thick polishing pad. FIG. 5 is a schematic view showing the flat polishing machine used in the first preferred embodiment, after a soft pad is disposed between the polishing pad and the rotating platform, and then the metal product is finely polished; 6 is a perspective view showing a patterned barrier layer formed on the second processing surface; FIG. 7 is a perspective view illustrating the metal polishing process to remove the first processed surface and the second processing Figure 8 is a perspective view showing the surface finish of the metal product; Figure 9 is a perspective view showing the removal of the patterned barrier layer on the surface of the metal article to make the metal article The surface has a mirrored area and a non-specular area; FIG. 10 is a schematic cross-sectional view showing the formation of a barrier layer on the non-specular area of the metal article; FIG. 11 is a schematic cross-sectional view showing the anodization of the metal article. The surface of the metal product is not formed by the group of barrier layers to form an oxide film layer; FIG. 12 is a schematic cross-sectional view showing that a filling is formed on the oxide film layer. The holes colored oxide film layer; FIG. 13 is a cross-sectional schematic view illustrating a protective layer formed on the coloring layer; FIG. 14 is a schematic view and a sectional view, shows that the barrier metal layer to complete the article Removal.

For a preferred embodiment of the surface treatment method of the metal product of the present invention, please refer to FIG. 2, the metal product 1 may be pure aluminum, aluminum alloy, or metal such as magnesium, barium, copper, manganese, iron, zinc, tin or The metal product 1 has a convex portion 10, such as an outer casing of an electronic product made of an alloy. The surface treatment method sequentially comprises the steps of: rough polishing the surface of the metal product 1 to remove the pits or processing lines on the surface of the metal product 1 to form a first processing surface 11. In the preferred embodiment, a cloth polishing machine (not shown) is used to perform rough polishing on the surface of the metal product 1 by using a cloth wheel polishing machine for polishing the surface of the metal product. The industry is well known, so it will not be repeated here.

Referring to Figures 3, 4 and 5, the portion of the first machined surface 11 of the metal article 1 located in the convex portion 10 is further subjected to a fine polishing process to form a mirror-finished second machined surface 12. The second processing surface 12 is a region in which the surface of the convex portion 10 of the metal product 1 extends downward from the top, and the surface roughness of the second processed surface 12 is less than 0.02 μm. In the preferred embodiment, a flat polishing machine 9 is used to perform a fine polishing treatment on the surface of the convex portion 10 of the metal product 1. Referring to FIG. 4, the plane polishing machine 9 mainly has a rotating platform 91, a polishing pad 92 detachably fixed to the rotating platform 91, and a clamping jig 93 for holding the metal product 1. The fine polishing treatment is to drive the metal product 1 to press the polishing pad 92 by the clamping jig 93, so that the convex portion 10 of the metal product 1 is partially sunk on the polishing pad 92, and is polished. The cushion 92 is depressed by the metal product 1 to form a depressed portion 921 contacting the surface of the convex portion 10 of the metal product 1; then the rotation of the rotating platform 91 is driven to drive the polishing pad 92 to rub the surface of the convex portion 10 of the metal product 1 to be soft. The area of the pad 92 is such that a second machined surface 12 is formed. Since the contact area of the surface of the convex portion 10 of the metal article 1 with the polishing pad 92 is limited by the thickness of the polishing pad 92, the thickness of the polishing pad is increased by increasing the thickness of the polishing pad 92 (see Fig. 4). Good is greater than 1mm. Or before the polishing pad 92 is driven to rub the surface of the convex portion 10 of the metal article 1, a soft pad 94 is disposed between the polishing pad 92 and the rotating platform 91 (see FIG. 5) to increase the depression of the polishing pad 92. The downward extension depth of the portion 921 increases the contact area of the surface of the convex portion 10 of the metal product 1 with the polishing pad 92, that is, increases the area of the second processing surface 12. Since the polishing parameter condition of the mirror surface of the surface of the metal product by the surface polishing machine 9 is known to those skilled in the art, it will not be repeated here.

Referring to Figure 6, a patterned barrier layer 2 is formed on the second machined surface 12 of the metal article 1. The patterned barrier layer 2 has a pattern portion 21 and a character portion 22. In detail, the patterning barrier layer 2 is formed by applying a UV light-sensitive ink to the second processing surface 12 of the metal product 1, and then performing a stepwise exposure process on the ultraviolet light-sensitive ink. The bond is interrupted by ultraviolet light, and then the developing solvent is used to remove the ultraviolet light-sensitive ink whose molecular bond is broken to form the patterned barrier layer 2. Since the conditions of the yellow light lithography process are well known to those skilled in the art, no further details are provided herein.

Referring to Figures 6 and 7, chemical polishing of the surface of the metal product 1 Light treatment to homogenize the surface roughness of the second processing surface 12 that is not patterned by the patterned barrier layer 2 and the first processing surface 11 such that the gloss of the first processing surface 11 and the second processing surface 12 are uniform There are no obvious boundaries between the 11 and 12 (see Figure 7). Since the conditions of the chemical polishing treatment are well known to those skilled in the art, they will not be described again.

Referring to Fig. 8, the surface of the metal article 1 which is not shielded by the patterned barrier layer 2 is subjected to a surface decoration treatment. In the preferred embodiment, the surface decoration treatment may be performed by sandblasting a surface of the metal product 1 that is not shielded by the patterned barrier layer 2 into a matte surface, or for the surface of the metal product 1 not being masked by the patterned barrier layer 2. The area is subjected to hairline processing to form a plurality of hairline patterns. However, the surface decoration treatment of the surface of the metal product 1 is not limited to the above-described sand blasting treatment or hairline treatment, and other surface decoration treatments may be performed according to product design requirements.

Referring to FIG. 8 and FIG. 9, the metal product 1 is immersed in an organic solvent to remove the patterned barrier layer 2, that is, the pattern portion 21 and the character portion 22 are removed, because the masked portion of the patterned barrier layer 2 is partially processed. The surface 12 has a surface average roughness of less than 0.02 μm, and the non-patterned barrier layer 2 is a chemically polished region whose surface is non-specular, so that the surface of the metal article 1 has a corresponding pattern. The mirror region 13 of the barrier layer 2 and the non-specular region 14 other than the mirror region 13 are formed. The mirror area 13 has a pattern mirror portion 131 and a mirror surface portion 132 respectively corresponding to the pattern portion 21 and the character portion 22 of the patterned barrier layer 2.

The mirror area 13 on the surface of the metal product 1 is colored. The above coloring process includes the following steps: Referring to Figure 10, a barrier layer 3 is formed on the non-specular area 14 of the surface of the metal article 1. However, the formation method of the barrier layer 3 is the same as the method of forming the patterned barrier layer 2, and therefore will not be described herein. Referring to FIG. 11, the metal article 1 is anodized so that the surface of the metal article 1 is not blocked. The covered mirror region 13 forms an oxide film layer 133 having a plurality of holes 130. Referring to FIG. 12, the metal product 1 is subjected to a dyeing process to form a coloring layer 4 filling the holes 130 on the oxide film layer 133. In detail, the dyeing process of the metal product 1 includes a printing process such as lithography, screen printing, water transfer, thermal transfer, and inkjet. When the dyeing process is performed, the contour edge of the colored layer 4 is precisely defined by the barrier layer 3, and the printing ink can be blocked from blooming outward, or when inkjet printing is used as the selection of the inkjet dots forming the contour edge, To form a colorful coloring layer 4 having a sharp contoured edge; referring to FIG. 13, the hole 130 of the oxide film layer 133 is subjected to a sealing treatment. In detail, the sealing treatment is to form a protective layer 5 to block the colored oxide film layer 133, so as to protect the ink in the hole 130 from being scratched or caused by external force, and to improve corrosion resistance and wear resistance. Light fastness and other aspects of performance. The sealing treatment includes metal salt sealing treatment, organic material sealing treatment or coating sealing treatment, for example, nickel acetate sealing at a high temperature of 80 to 100 degrees; referring to FIG. 14, the metal product 1 is immersed in an organic solvent to remove the barrier layer. 3. Since the barrier layer 3 has defined the contour of the colored layer 4, the resulting colorful colored layer 4 will have a sharp contoured edge.

It is worth mentioning that according to product design requirements, metal can be The pattern mirror surface 131 and the mirror surface portion 132 of the mirror area 13 of the product 1 are colored in the same color or different colors. In addition, the printing process can be used to make the color of the mirror face portion 132 gradually distributed, or to color each character of the mirror face portion 132, or to control the metal product in the dyeing process. In the above, the oxide film layer 133 of different regions has different time in the dyeing tank and the color is gradually distributed. In addition, in the dyeing process, a colored layer 4 may be formed on the convex surface portion 10 of the metal product 1 of the present invention by means of inkjet printing, with the aid of a jig or a rotating tool, and the invention is not limited thereto.

In summary, the surface treatment method of the metal product of the present invention is formed on the surface of the metal product 1 via the above steps to form a mirror surface region 13 of the convex portion 10 and a non-mirror region 14 outside the mirror surface region 13 to complete the mirror pattern. (mirror region 13) is produced, and wherein the surface roughness of both the portion of the non-specular region 14 and the first processed surface 11 of the second processed surface 12 is homogenized by chemical polishing to remove the first processed surface 11 and The second processing surface 12 has obvious boundary lines due to different roughness, so as to solve the subsequent problems caused by the mirror surface polishing of the metal product 1 incapable of the whole surface. In addition, by increasing the thickness of the polishing pad 92 or providing a soft pad 94 between the polishing pad 92 and the rotating platform 91, the downward extension depth of the depressed portion 921 of the polishing pad 92 is increased, thereby increasing The polishing area of the second second processing surface 12 is such that the mirror area required for the subsequent mirror pattern is obtained, so that the object of the present invention can be achieved, and the metal product 1 treated by the surface treatment method of the above metal product can be obtained. This metal product 1 has a mirrored area 13 located on the convex portion 10 and a non-specular area 14 outside the mirrored area 13.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

1‧‧‧Metal products

10‧‧‧ convex face

13‧‧‧Mirror area

131‧‧‧pattern mirror face

132‧‧‧ text mirror face

14‧‧‧Non-mirror area

Claims (10)

A surface treatment method for a metal product, the metal product having a convex surface, the surface treatment method comprising the steps of: performing a rough polishing treatment on a surface of the metal product to form a first processing surface; and the first processing for the metal product a portion of the surface of the convex portion is subjected to a fine polishing treatment to form a second processing surface; a patterned barrier layer is formed on the second processing surface; and the surface of the metal product is chemically polished to make the first processing surface And smoothing the surface roughness of the portion of the second processing surface that is not covered by the patterned barrier layer; and removing the patterned barrier layer, the metal product surface having a pair of mirror regions to be patterned barrier layer and a A non-specular area outside the mirrored area. The surface treatment method of the metal article according to claim 1, wherein the second processing surface is a region of the metal article in which the convex surface extends downward from the top. The surface treatment method of the metal article according to claim 1, wherein the fine polishing treatment is to press the metal article down to a polishing pad, and the polishing pad is recessed to form a surface of the convex portion contacting the metal article. The depressed portion is then driven to polish the region of the raised surface of the metal article that contacts the polishing pad to form the second processed surface. The surface treatment method of the metal article according to claim 3, wherein The polishing pad has a thickness greater than 1 mm such that the second machined surface has a larger range. The surface treatment method for a metal article according to claim 3, wherein the fine polishing treatment further comprises a step of: setting a cushion to the polishing cushion before driving the polishing pad to rub the surface of the convex portion of the metal article On the contrary, one side of the metal article is used to increase the downward extension depth of the depressed portion, so that the second processed surface has a larger range. The surface treatment method for a metal article according to claim 1, further comprising the step of coloring the mirror region on the surface of the metal article. The surface treatment method of the metal article according to claim 6, wherein the coloring process comprises the steps of: forming a barrier layer on the non-specular area of the surface of the metal article; and anodizing the metal article to The mirror surface of the surface of the metal product not covered by the barrier layer forms an oxide film layer having a plurality of holes; for the metal product, a coloring layer is formed on the oxide film layer; and the holes of the oxide film layer are formed Performing a sealing process; and removing the barrier layer. The surface treatment method for a metal article according to claim 7, wherein the dyeing process is a printing process. The surface treatment method for a metal article according to claim 1, further comprising the step of performing a surface decoration treatment on the non-specular surface of the surface of the metal product, the surface decoration treatment comprising at least one of a sandblasting treatment and a hairline treatment. A metal article treated by the surface treatment method of the metal article according to claim 1, the metal article having the convex portion The mirror area and the non-specular area outside the mirror area.