TW201346072A - Method for manufacturing a metallic substrate with skidproof leather-like surface - Google Patents

Abstract

A method for manufacturing a metallic substrate with skidproof leather-like surface includes steps as followed. A metallic substrate is provided. A first pretreatment is executed to clean the metallic substrate. A surface of the metallic substrate is etched with etching solution and use a corrosive inhibiter to alleviate etching. A second pretreatment is applied on the surface of the metallic substrate, such as acid pickling and chemical polishing. An anodic treatment is performed on the metallic substrate to form an oxide layer with micro cells. The surface of the metallic substrate is activated and dyed. The micro cells are sealed with sealing agent. Finally, the surface of the metallic substrate is cleaned with dedusting agent.

Description

Metal workpiece manufacturing method with slippery leather texture surface

The invention relates to a method for manufacturing a metal workpiece with a slip-resistant leather texture surface, in particular to a metal surface processing technology for forming a slip-resistant leather touch on a surface of a metal workpiece.

Metal surface treatment technology usually refers to the modification or beautification of the metal surface after the metal has been initially processed, and further changes the material properties of the metal surface by chemical or machining. Or metal surface finishing.

More and more electronic metal casings or metal parts are treated through metal surfaces to fully utilize or enhance the characteristics and value of the products, such as plating, anodizing, coating, etc. Technology to achieve a variety of purposes.

For electronic products with short product cycles, metal casings play a key role, and manufacturers are constantly innovating in order to attract users' attention in the shortest possible time. However, the surface of the metal casing processed by the metal surface is generally biased to be smooth, and the user may feel slippery when gripping. The inventors are aware that the above problems can be improved, and it is painstakingly researched and used in conjunction with the theory. A method of manufacturing a metal workpiece having a slip-resistant leather textured surface.

The technical problem to be solved by the present invention is to provide a metal workpiece manufacturing method with a slip-resistant leather texture surface, which forms a fine particle structure on the surface of the metal workpiece to change the situation that the surface of the general metal workpiece is too smooth, and provides the user with touch. It has a touch of slippery leather.

In order to solve the above technical problem, according to one aspect of the present invention, a method for manufacturing a metal workpiece having a slip-resistant leather texture surface is provided, comprising the steps of: providing a metal workpiece; and first pre-treating to clean the surface of the metal workpiece; Etching the surface of the metal workpiece with an etchant and using a corrosion inhibitor to moderate the etching degree; treating the surface of the metal workpiece a second time; anodizing the surface of the metal workpiece to form an oxide film having micropores; and activating the metal The workpiece is subjected to an anodized surface; the surface of the metal workpiece is dyed; the micropores formed on the surface of the metal workpiece are sealed with a sealing agent; and the surface of the metal workpiece is cleaned with an ash removing agent.

According to an embodiment of the invention, the step of pre-treating the metal workpiece for the first time comprises the sub-step of degreasing and water washing the surface of the metal workpiece.

According to an embodiment of the invention, wherein the second pre-treating the surface of the metal workpiece comprises: pickling and chemically polishing the surface of the metal workpiece to produce an atomizing effect.

The invention has the following beneficial effects: the texture formed by the etching is more similar to the irregular concave-grain structure of the leather surface, and the anode structure is further processed after the anode structure is further processed to form a fine particle structure touch.

In order to further understand the technology, method and effect of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the present invention. The drawings and the annexed drawings are intended to be illustrative and not to limit the invention.

Please refer to FIG. 1 , which is a schematic diagram of a manufacturing process of a metal workpiece having a slip-resistant leather textured surface according to the present invention. First, the method of manufacturing a metal workpiece having a slip-resistant leather textured surface of the present invention provides a metal workpiece. In this embodiment, the metal shell of the electronic product is taken as an example. In order to cooperate with the subsequent related steps, the suitable metal material is an aluminum alloy metal workpiece, preferably according to the Aluminium Association (Aluminium Association) number, the aluminum alloy 6000 series and the 5000 series. , 5000 refers to aluminum-magnesium alloy, and 6000 refers to aluminum-magnesium-bismuth alloy.

Metal workpieces can be machined according to the required shape. In some cases, it is also possible to sandblast the metal workpiece first. These shaped portions are conventional techniques and will not be described in detail in the present invention. The steps, possible parameters, and preferred parameters of the metal surface processing utilized by the present invention are separately described below.

Since the aluminum alloy workpiece is subjected to mechanical forming, some grease or dirt is usually left. First, the surface of the aluminum alloy workpiece needs to be cleaned first to suit the subsequent steps. In the present embodiment, as shown in Fig. 1, the degreasing of step P1 is included to remove grease or dirt adhering to the surface of the metal workpiece. This step can be considered as the first pretreatment step.

The degreasing performance parameter may be carried out using a degreasing agent having a concentration of 1 to 50% at a temperature of 10 to 90 degrees Celsius. The concentration of the degreaser depends on the application of the metal workpiece. In this embodiment, the metal shell of the electronic product is taken as an example, and the preferred parameter is 3-5% degreasing agent, and the temperature is about 50 degrees (Note: the temperature unit of the present invention is Celsius).

After degreasing, at least one water washing is needed to wash away the residual degreasing agent. The washing process may be one to five, the temperature may be 5-95 degrees, preferably the temperature is about 25 degrees, and the number of times may be two. In the subsequent steps, water washing is required to wash away the chemical solution remaining after the previous step, and the parameters are as described above, and will not be described later for the water washing.

Following the etching of step S2, the surface of the metal workpiece is etched with a chemical, including etching the surface of the metal workpiece with an etchant, and using a corrosion inhibitor (which may also be referred to as a corrosion inhibitor) to slow the etching rate. The present invention etches the metal workpiece prior to the anodizing process, particularly with a corrosion inhibitor, whereby the surface of the metal workpiece can be textured as a leather, as shown in Figures 2 and 2A. 2 shows a schematic cross-sectional view of a metal workpiece 100 including a base layer 101 and a skin layer 102. 2A is an enlarged view of a portion A of FIG. 2, FIG. 2A is a comparison with FIG. 3, and FIG. 2A shows the surface of the etched metal workpiece to which no corrosion inhibitor is added. FIG. 3 shows that the surface layer 103 of the present invention is etched with a corrosion inhibitor to form the uneven structure 104. This figure is only a schematic representation, and in fact, after etching, a slightly curved, irregular relief structure, similar to the texture structure, will be produced.

In this embodiment, the etchant is a solution containing at least one transition metal salt. For example, the etchant may be a solution selected from one or more of iron, copper and nickel metal salts, such as ferric chloride, copper sulfate, nickel sulfate, and the concentration of the solution may be 0.1-10 g/ L. The corrosion inhibitor may be a long-chain surfactant. The corrosion inhibitor may be a mixture of cationic, anionic and nonionic long-chain surfactants, and the concentration may be 1-500 PPM (part per million, million). One of the points).

The preferred parameters for etching in this embodiment are that the etchant comprises 3.2 g/L of ferric chloride (FeCl ₃ ) and 0.6 g/L of copper sulfate (CuSO ₄ ), and the corrosion inhibitor is 50 PPM of dodecyl group. Sodium benzoate at a temperature of 40 ± 5 degrees Celsius. The etching time is 1-15 minutes, which can be determined depending on the degree to which the metal workpiece needs to be etched. The chemical reaction of the copper sulfate solution and the aluminum alloy workpiece after etching is expressed as: 3Cu ⁺² +2Al→3Cu+2Al ⁺³ .

After the etching, a second pre-treatment step P2, which is mainly based on chemical polishing, is performed, that is, the surface of the metal workpiece is chemically polished to produce an atomization effect, or simply throwing. The pre-processing step P2 includes a first pickling of the metal workpiece in step P21, a chemical polishing of the metal workpiece in step P22, and a second pickling of the metal workpiece in step P23. Each step includes at least one water washing process, and the water washing process may be one to five, preferably two.

The pickling can be carried out using an acidic solution of 1-50 ml/L at a temperature of 10-90 °C; the preferred parameter for pickling in this example is a 20 ml/L nitric acid solution at a temperature of about 25 degrees.

The chemical polishing may be 1-85% of one or more acidic solutions, such as phosphoric acid, sulfuric acid, etc., and the temperature is 10-90 degrees; the preferred parameter of the embodiment is 85% phosphoric acid solution, the temperature is about 90-93 degrees, and the time is 1-10 seconds. In particular, in order to cooperate with the present invention, it is possible to produce a textured surface having a slip-resistant leather, and the gloss of the polishing is recommended to be less than 6.

Next, the surface of the metal workpiece is anodized in step S3, that is, the surface of the metal workpiece is anodized to form a microporous oxide film. The parameters that are feasible for the anode treatment of the present invention are as shown in Table 1 below.

Table 1. Parameter range of the anode treatment (step S3) of the present invention

After testing according to the present invention, preferred parameters for the anodic treatment include immersion in a sulfuric acid solution having a concentration of 20 wt% to 25 wt%, a temperature of 15 to 25 degrees Celsius, and a current density of 1.4 amps (A) per square meter (dm ² ). The processing time is at least 30 minutes. The temperature of the water washing is preferably about 25 degrees, and the number of times is two.

After the anode treatment, the step of step S4 is followed to activate the surface of the metal workpiece through the anodization to enhance the dyeing effect; the activator can fully activate the surface of the metal workpiece to facilitate subsequent surface treatment. The activation parameter can be an acidic solution of 1-50 ml/L, a temperature of 5-95 degrees, and a time of 5-90 minutes. Then wash 1-5 lanes. The preferred parameters of this embodiment are 20 ml/L nitric acid at a temperature of about 25 degrees, followed by two water washes at a temperature of 25 degrees. The function of the activation is to remove the ash impurities formed by the anodization to improve the overall dyeability.

After activation, in step S5, the surface of the metal workpiece is dyed. This step utilizes a general commercial aluminum alloy dye at a temperature of 5 to 50 degrees and a treatment time of 0.1 to 10 minutes. The preferred parameters are recommended to be 40 degrees Celsius and 1-6 minutes. Then, two water washings were carried out at a temperature of about 25 degrees.

In order to enhance the structural anti-staining property of the oxide film, the present invention performs the sealing process of step S6, and the surface micropores of the metal workpiece are sealed by a sealing agent, and the sealing operation mode after the anode treatment is generally used. Commercial nickel acetate sealing agent. The sealing hole of the present invention is a commercial nickel acetate sealing agent 1-15 g/L, the temperature is 5-95 degrees, and the time is 5-90 minutes. The above-mentioned commercial nickel acetate sealing agent refers to a sealing agent mainly composed of nickel acetate.

The preferred parameters for the above sealing are that the aluminum alloy workpiece is immersed in a commercial nickel acetate sealing agent having a concentration of 7 g/L at a temperature of 90 ± 5 degrees Celsius for 30 minutes.

Finally, the present invention is a ash removing process, step S7, to remove the ash content attached to the surface of the aluminum alloy workpiece, usually by using an acidic solution as an ash removing agent to clean the metal workpiece, and then washing the metal workpiece. The ash removal process parameter of the present invention may be an acidic solution of 1-50 ml/L and a temperature of 5 to 95 degrees. After that, 1-5 lanes of water are washed, and the temperature can be 5-95 degrees.

The present invention is suitable for the housing characteristics of an electronic product, wherein the ash removal process is preferably performed by using nitric acid having a concentration of 20 ml/L as a ash removing agent at a temperature of about 25 degrees. It is then washed at least two times with water at a temperature of about 25 degrees.

Referring to FIG. 4, the present invention provides an aluminum alloy workpiece having a slip-resistant leather textured surface through the method for manufacturing a metal workpiece having a slip-resistant leather textured surface of the present invention. The surface of the etched metal workpiece is formed into a concave-convex structure 104, and then subjected to subsequent steps such as chemical polishing, pickling, and anodic treatment, and a finer particle structure 105 is formed on the basis of the uneven structure 104 of FIG. The etch is combined with the surface of the particulate structure 105 after the anodization, and has a feeling of slipping leather texture when touched, giving the user an illusion of leather texture.

The grain formed by the etching is more similar to the irregular concave-grain structure of the leather surface, and the anode structure is further processed by the anodic structure to form a fine particle structure touch. Unlike the surface that is simply sandblasted, the surface after sandblasting is a circular pothole or an angular pothole, and the resulting high and low roughness is also different from the degree of detail after the etching and anode treatment of the present invention.

After the metal casing of the general electronic product is subjected to surface processing, the surface thereof is smooth, and the feeling of some users when touching may cause a slippery feeling. Through the manufacturing method of the present invention, the metal workpiece having the slip-resistant leather texture surface can be formed into a fine particle structure on the metal surface, and the texture formed by the etching is like the touch feeling with the texture of the slip-resistant leather. Provides some anti-slip features when holding electronic products.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100. . . Metal workpiece

101. . . Grassroots

102. . . surface layer

103. . . Surface detail structure

104. . . Post-etched relief structure

105. . . Anode treated particle structure

Fig. 1 is a schematic view showing the manufacturing process of a metal workpiece having a slip-resistant leather texture surface according to the present invention.

2 is a schematic view showing the structure of a metal workpiece of the present invention.

2A is an enlarged schematic view of a portion A of FIG. 2.

Fig. 3 is a structural schematic view showing the surface of a metal workpiece produced by the manufacturing method of the present invention etched and enlarged.

Fig. 4 is an enlarged schematic view showing the structure of the surface of the metal workpiece produced by the manufacturing method of the present invention.

The representative map in this case is a flowchart, so there is no component symbol.

Claims (13)

A method for manufacturing a metal workpiece having a slip-resistant leather textured surface, comprising the steps of: providing a metal workpiece; first pre-treating to clean the surface of the metal workpiece; etching the surface of the metal workpiece with an etchant, and using a corrosion inhibitor to Reducing the degree of etching; treating the surface of the metal workpiece a second time; anodizing the surface of the metal workpiece to form an oxide film having microvoids; activating the surface of the metal workpiece through the anodization; dyeing the surface of the metal workpiece; The holes process the micropores formed on the surface of the metal workpiece; and the ash is removed to clean the finished surface of the metal workpiece. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the step of pre-treating the metal workpiece for the first time comprises the sub-step of degreasing and water washing the surface of the metal workpiece. The method for producing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the etchant is a solution containing at least one transition metal salt, and the corrosion inhibitor is a long-chain surfactant. The method for producing a metal workpiece having a slip-resistant leather texture surface according to claim 3, wherein the etchant is a solution of at least one metal salt selected from the group consisting of iron, copper and nickel metal salts; The corrosion inhibitor is a long-chain surfactant selected from at least one of the following: cationic, anionic, and nonionic long-chain surfactants. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 3, wherein the metal workpiece is an aluminum alloy workpiece, and the etchant comprises 3.2 g/L of ferric chloride and 0.6 g/L. Copper sulfate, the corrosion inhibitor is 50 PPM of sodium dodecyl benzene hydride, and the temperature is 40 ± 5 degrees Celsius. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the second pre-treating the surface of the metal workpiece comprises: pickling and chemically polishing the surface of the metal workpiece to produce an atomization effect. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 6, wherein the pickling step preferably has a nitric acid solution of 5 ml/L and a temperature of 25 degrees. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 6, wherein the surface of the metal workpiece is chemically polished to have a parameter of 85% phosphoric acid, a temperature of 90-93 degrees, and a time of 1-10. second. The method for producing a metal workpiece having a slip-resistant leather texture surface according to claim 8, wherein the chemical polishing has a gloss of less than 6. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the step of anodizing comprises immersing in a sulfuric acid solution having a concentration of 20 wt% to 25 wt%, and the temperature is 15 to 25 degrees Celsius. The current density is 1.4 amps per square meter and the treatment time is at least 30 minutes. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the activating the metal workpiece comprises immersing in a 20 ml/L nitric acid solution at a temperature of 25 ± 5 degrees Celsius. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the sealing step comprises immersing the aluminum alloy workpiece in a 7 g/L nickel acetate sealing agent at a temperature of 90 ° C. ±5 degrees, time is 30 minutes. The method for manufacturing a metal workpiece having a slip-resistant leather texture surface according to claim 1, wherein the ash removing step comprises treating with a 20 ml/L nitric acid solution at a temperature of 25 ± 5 degrees Celsius.