TW202129074A - Surface treatment method for magnesium alloy object and structure thereof making the surface have a metallic luster texture, thereby achieving the anti-corrosion effect - Google Patents

Abstract

The invention provides a surface treatment method for a magnesium alloy object, including: providing a magnesium alloy object; performing a pretreatment on the magnesium alloy object, and performing a micro arc oxidation (MAO) treatment on the surface of the magnesium alloy object to generate a MAO layer; sputtering at least one metal layer or at least one non-metal layer on the surface of the MAO layer, wherein with the surface roughness of the MAO layer, a light source projected on the metal layer or non-metal layer sputtered on the surface of the MAO layer has different reflection angles; and spraying a coating on the metal layer or non-metal layer to make the surface have a metallic luster texture, thereby achieving the anti-corrosion effect. The invention further provides a surface structure of a magnesium alloy object.

Description

Surface treatment method and structure of magnesium alloy object

The invention relates to a surface treatment method and structure of a magnesium alloy object.

The casing/housing of the electronic device may include a plurality of structural elements. For example, a notebook computer may include a display, a main body, etc. The display further includes an upper cover and a display main body, and the main body may include a keyboard cover and a bottom structure. The aforementioned body or cover may include various suitable materials.

The shell/shell of electronic equipment, such as the shell of a portable electronic device, has a very large opportunity and frequent contact with other objects (such as desktop, hand, ground, magnesium alloy objects, etc.), resulting in shell/shell deformation . As the shell/shell wears or paints off or the protective layer is damaged due to collision or friction of the shell/shell, the metal objects of the shell/shell body are rusted and cannot be protected, and the aesthetic effect of attracting consumers is lost visually.

The outer casing is made of a magnesium alloy product with a metallic feel, but the metallic magnesium alloy is generally electroplated on the surface of the magnesium alloy by electroplating. However, the magnesium in the magnesium alloy is very metallized, and it is generally not easy to handle the electroplating process on the surface of the magnesium alloy. Therefore, the surface of the magnesium alloy must be passivated first, and the manufacturing process is more complicated.

The purpose of the present invention is to make the surface of the magnesium alloy object have a metallic luster texture and achieve the anti-corrosion function.

The present invention provides a first embodiment of a surface treatment method for magnesium alloy objects, including Provide a magnesium alloy object; perform a pretreatment on the magnesium alloy object, perform a micro-arc oxidation treatment (MAO) on the surface of the magnesium alloy object to generate a micro-arc oxidation layer; perform sputtering on the surface of the micro-arc oxidation layer at least A metal layer or at least one non-metal layer, using the surface roughness of the micro-arc oxidation layer to make a light source projected on the metal layer or non-metal layer sputtered on the surface of the micro-arc oxidation layer with different reflection angles; and A coating is sprayed on the metal layer or non-metal layer to make the surface have a metallic luster texture and achieve the anti-corrosion function.

The micro-arc oxidation layer can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide or titanium metal oxynitride or silicon oxide.

The light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxide layer has different reflection angles of 0-180 degrees.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a transparent or matte coating.

The first embodiment of the present invention further provides a surface structure of a magnesium alloy object, which includes a substrate on which a micro-arc oxidation layer is formed. The micro-arc oxidation layer has a rough surface on the micro-arc oxidation layer. At least one metal layer or at least one non-metal layer is provided, and a coating is provided on the metal layer or the non-metal layer.

The micro-arc oxidation layer can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide, titanium metal oxynitride, or silicon oxide.

The light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxide layer has different reflection angles of 0-180 degrees.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a clear coating or a matte coating.

The second embodiment of the present invention provides a magnesium alloy object surface treatment method, which includes: providing a magnesium alloy object; performing a pretreatment on the magnesium alloy object; performing a micro-arc oxidation treatment on the surface of the magnesium alloy object to generate a micro Arc oxidation layer: A paint layer is generated by electrophoresis coating (ED) treatment or chemical solution immersion or spray paint as the sealing layer of the micro arc oxidation layer, and at the same time, using the appearance characteristics of the paint layer, at least sputtering on the paint layer A metal layer or at least one non-metal layer; and spraying a coating on the at least one metal layer or at least one non-metal layer.

The micro-arc oxidation layer can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide or titanium metal oxynitride or silicon oxide.

The light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxide layer has different reflection angles of 0-180 degrees.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a transparent or matte coating.

Wherein, the medicinal liquid of the medicinal liquid immersion method can be an aqueous silicone resin.

The second embodiment of the present invention further provides a surface structure of a magnesium alloy object, including: a substrate; a micro-arc oxidation layer is formed on the substrate, and the micro-arc oxidation layer has a rough surface; and the micro-arc oxidation layer At least one metal layer or at least one non-metal layer is sputtered; a lacquer layer is arranged on the metal layer or the non-metal layer, and a coating is arranged on the lacquer layer.

The micro-arc oxidation layer can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide, titanium metal oxynitride, or silicon oxide.

The light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxide layer has different reflection angles of 0-180 degrees.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a clear coating or a matte coating.

The advantages of the present invention are treated by micro-arc oxidation, and at least one metal layer or at least one non-metal layer and the transparent coating or matte coating are sputtered on the micro-arc oxidation layer to achieve the anti-corrosion effect.

10.20‧‧‧Surface structure of magnesium alloy objects

11、21‧‧‧Substrate

12, 22‧‧‧Micro arc oxide layer

121、221‧‧‧Rough surface

13‧‧‧Metal layer

14‧‧‧Non-metallic layer

15‧‧‧Clear coating or matt coating

23‧‧‧lacquer layer

24‧‧‧Metal layer

25‧‧‧Non-metallic layer

26‧‧‧Transparent coating or matte coating or anti-glare layer (AG layer)

S101~S105‧‧‧Step

S201~S205‧‧‧Step

Fig. 1 is a processing flowchart of the first embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure of the first embodiment of the present invention.

Fig. 3 is a processing flowchart of the second embodiment of the present invention.

Fig. 4 is a schematic diagram of the structure of the second embodiment of the present invention.

The following describes the implementation of the present invention with specific specific embodiments. Those skilled in the art can easily understand the other advantages and effects of the present invention from the contents disclosed in this specification, and can also be implemented by other different specific embodiments. Or apply.

The present invention defines some processing methods as follows:

Micro arc oxidation (MAO) :

Micro arc oxidation (MAO) is also called plasma electrolytic oxidation. MAO can generate an oxide coating layer on conductive materials such as metallic materials. "Metallic material" means pure metal, metal alloy, intermetallic or metal-containing compound, etc. The metal material may include aluminum, magnesium, titanium, and the like. MAO uses high electromotive force so that discharge can occur and the resulting plasma can modify the structure of the oxide layer.

MAO can create a small amount of electrical discharge on the surface of the metal material immersed in the electrolyte. MAO treatment can be used to form a relatively thick and mostly crystalline oxide coating. The thickness of the coating may be tens or hundreds of microns, for example, but is not limited to any specific value. For example, to meet the requirements of applications and processes, MAO coatings with larger or smaller thicknesses can be produced. The resulting micro-arc oxide coating may be dense and/or ductile and may have a relatively high hardness, especially as opposed to the oxide layer formed by anodization.

In contrast to deposition processing, MAO is a chemical conversion technology. The oxide layer formed as a result of MAO is the result of oxidation of the underlying metal material object, rather than the oxide layer deposited on the object. Compared with deposition-based treatments (such as spraying treatments), MAO coatings can have higher adhesion to the underlying metal material objects.

Electrophoresis coating (electro-coating; ED) :

Electro-eoating is a coating method that uses an external electric field to deposit the pigment suspended in the electrophoresis solution on the surface of the magnesium alloy object. Electrophoretic coating has the characteristics of water solubility, non-toxicity, easy automatic control, etc., and it has quickly been widely used in industries such as automobiles, building materials, hardware, and home appliances. The principle of electrophoretic coating is that the resin contained in the cathodic electrophoretic coating has a basic group, which is neutralized by acid to form a salt and dissolve in water. After the direct current is applied, the acid radical negative ions move to the anode, and the resin ions and the pigment particles wrapped by them move to the cathode with positive charges and are deposited on the cathode. This is the basic principle of electrophoretic coating (commonly known as paint coating). Electrophoretic coating is a very complex electrochemical reaction. It is generally believed that at least four effects of electrophoresis, electrodeposition, electrolysis, and electroosmosis occur simultaneously.

Characteristics of electrophoretic surface treatment technology: electrophoretic paint film has the advantages of fullness, uniformity, flatness and smooth coating. The hardness, adhesion, corrosion resistance, impact performance, and permeability of electrophoretic paint film are significantly better than other coating processes.

Approach

The housing structure described herein or a portion thereof may be manufactured or processed by a method involving any suitable number of processes. Figure 1 shows the processes involved in one example of such a method. The processing method shown in FIG. 1 may include using MAO to process the first surface of an object including a metal material (S101). The oxidation process may involve any suitable process(s). Depending on the materials and technologies involved, any suitable oxidation parameters can be used.

Referring to FIG. 1, the present invention provides a first embodiment of a surface treatment method for a magnesium alloy object, which includes providing a magnesium alloy object (S101). A pretreatment is performed on the magnesium alloy object (S102). A micro-arc oxidation treatment (MAO) is performed on the surface of the magnesium alloy object to generate a micro-arc oxidation layer (S103). Sputter at least one metal layer or at least one non-metal layer on the surface of the micro-arc oxidation layer, and use the surface roughness of the micro-arc oxidation layer to project a light source on the surface of the micro-arc oxidation layer. The metal layer or non-metal layer on the surface has different reflection angles (S104). And spray a coating (S105) on the metal layer or non-metal layer to make the surface have a metallic luster texture and achieve anti-corrosion function.

The pretreatment includes the removal of dust particles and oil stains.

The micro-arc oxidation layer can be a passivation layer or an oxide layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide, titanium metal oxynitride, or silicon oxide.

The light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxide layer has a different reflection angle of 0-180 degrees.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a clear coating or a matte coating. The transparent coating contains anti-fingerprint function or organic paint to protect the sputtering layer.

In one embodiment, one of the metal layer and the non-metal layer of the present invention may be disposed on the micro-arc oxidation layer.

In one embodiment, the metal layer and the non-metal layer of the present invention may be sequentially disposed on the micro-arc oxidation layer.

In one embodiment, the non-metallic layer and the non-metallic layer of the present invention can be disposed on the micro-arc oxidation layer.

In one embodiment, the metal layer and the metal layer of the present invention may be disposed on the micro-arc oxidation layer.

Please refer to FIG. 2, the first embodiment of the present invention further provides a magnesium alloy object The surface structure 10 includes a substrate 11 on which a micro-arc oxidation layer 12 is formed, the micro-arc oxidation layer 12 has a rough surface 121, and at least one metal layer is disposed on the micro-arc oxidation layer 12 13 or at least one non-metal layer 14, and a coating 15 is provided on the metal layer 13 or the non-metal layer 14. The substrate can be a magnesium alloy object. As shown in FIG. 2, the metal layer 13 or the non-metal layer 14 can be sputtered on the micro-arc oxide layer 12 respectively. The metal layer 13 and the non-metal layer 14 can also be sputtered on the micro-arc oxidation layer 12 respectively.

The micro-arc oxidation layer 12 can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer 12 can be an aluminum alloy-like surface. The surface roughness of the rough surface 121 of the micro-arc oxidation layer 12 is Ra 0.5-2um with irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide, titanium metal oxynitride, or silicon oxide.

The light source 16 projected on the metal or non-metal layer sputtered on the micro-arc oxide layer 12 has a different reflection angle of 0-180 degrees.

The coating 15 can be resin, which can enhance corrosion/scratch resistance. The coating can be a clear coating or a matte coating. The transparent coating contains anti-fingerprint function or organic paint to protect the sputtering layer.

In an embodiment, one of the metal layer 13 and the non-metal layer 14 of the present invention may be disposed on the micro-arc oxide layer 12.

In one embodiment, the metal layer 13 and the non-metal layer 14 of the present invention may be sequentially disposed on the micro-arc oxide layer 12.

In an embodiment, the non-metallic layer 14 and the non-metallic layer 14 of the present invention may be disposed on the micro-arc oxide layer 12.

In an embodiment, the metal layer 13 and the metal layer 13 of the present invention may be disposed on the micro-arc oxidation layer 12.

Referring to FIG. 3, the present invention provides a second embodiment of a surface treatment method for a magnesium alloy object, which includes: providing a magnesium alloy object (S201). A pretreatment is performed on the magnesium alloy object (S202). A micro-arc oxidation treatment (MAO) is performed on the surface of the magnesium alloy object to generate a micro-arc oxidation layer (S203). A lacquer layer is generated as the sealing layer of the micro-arc oxidation layer by electrophoretic coating (ED) treatment or chemical soaking method or spray paint, and at the same time, using the appearance characteristics of the lacquer layer, at least one metal layer or at least one metal layer is sputtered on the lacquer layer A non-metallic layer achieves a metallic appearance (S204). A coating is sprayed on the metal layer or non-metal layer to make the surface have a metallic luster texture and achieve the anti-corrosion function (S205).

The pretreatment includes the removal of dust particles and oil stains.

The micro-arc oxidation layer can be a passivation layer to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer can be an aluminum alloy-like surface. The surface roughness of the micro-arc oxide layer is Ra 0.5-2um irregular holes.

The metal layer includes aluminum/stainless steel/titanium and other metals. The non-metal layer includes titanium metal oxide, titanium metal oxynitride, or silicon oxide.

The lacquer layer can also be sprayed in a way to form a three-dimensional granular feeling. For example, spraying Shatian paint. That is, the metal layer is sputtered on the paint layer, and the non-metal layer is sputtered on the metal layer. Or the metal layer or the non-metal layer is sputtered on the paint layer.

Wherein, the medicinal liquid of the medicinal liquid immersion method can be an aqueous silicone resin.

The coating can be resin, which can enhance corrosion/scratch resistance. The coating can be a transparent coating, a matte coating, or an anti-glare layer (AG layer). The transparent coating contains an anti-fingerprint function or an organic coating to protect the sputtering layer.

In one embodiment, one of the metal layer and the non-metal layer of the present invention may be disposed on the micro-arc oxidation layer.

In one embodiment, the metal layer and the non-metal layer of the present invention may be sequentially disposed on the micro-arc oxidation layer.

In one embodiment, the non-metallic layer and the non-metallic layer of the present invention can be disposed on the micro-arc oxidation layer.

In one embodiment, the metal layer and the metal layer of the present invention may be disposed on the micro-arc oxidation layer.

Referring to FIG. 4, the second embodiment of the present invention further provides a surface structure 20 of a magnesium alloy object, which includes a substrate 21 on which a micro-arc oxidation layer 22 is formed. Having a rough surface 221, at least one metal layer 24 or at least one non-metal layer 25 is arranged on the micro-arc oxidation layer 22, and a paint layer 23 is arranged on the metal layer or the non-metal layer, and the paint layer 23 is arranged There is a coating 26.

The substrate 21 may be a magnesium alloy object.

The micro-arc oxidation layer 22 can be a passivation layer, which is formed by micro-arc oxidation (MAO) to increase corrosion resistance. At the same time, the surface of the micro-arc oxidation layer 22 can be an aluminum alloy-like surface. The rough surface 221 of the micro-arc oxide layer 22 has irregular pores with a surface roughness of Ra 0.5-2um.

The paint layer 23 can be formed by electrophoretic coating treatment or spray painting treatment.

The light source 27 projected on the metal or non-metal layer sputtered on the micro-arc oxide layer 22 has a different reflection angle of 0-180 degrees.

The metal layer 24 includes aluminum/stainless steel/titanium and other metals. The non-metallic layer 25 Including titanium metal oxide or titanium metal oxynitride or silicon oxide.

Wherein, the coating 26 may be resin or the like to enhance corrosion/scratch resistance. The coating can be a transparent coating, a matte coating, or an anti-glare layer (AG layer). The coating includes an anti-fingerprint function to protect the sputtering layer.

In an embodiment, one of the metal layer 24 and the non-metal layer 25 of the present invention may be disposed on the micro-arc oxide layer 22.

In one embodiment, the metal layer 24 and the non-metal layer 25 of the present invention may be sequentially disposed on the micro-arc oxide layer 22.

In one embodiment, the non-metallic layer 25 and the non-metallic layer 25 of the present invention can be disposed on the micro-arc oxide layer 22.

In one embodiment, the metal layer 24 and the metal layer 24 of the present invention can be disposed on the micro-arc oxide layer 22.

The advantages of the present invention are treated by micro-arc oxidation, and the metal layer, the non-metal layer and the transparent coating or matt coating are arranged on the micro-arc oxidation layer, so that the surface has a metallic luster texture, which can achieve the effect of anti-corrosion . Furthermore, the surface of the magnesium alloy object is passivated and protected, and the passivation protection still maintains the original metallic luster.

S101~S105

Claims (13)

A surface treatment method for magnesium alloy objects, including: Provide a magnesium alloy object; Performing a pretreatment on the magnesium alloy object; Performing a micro-arc oxidation treatment on the surface of the magnesium alloy object to generate a micro-arc oxidation layer; Sputter at least one metal layer or at least one non-metal layer on the surface of the micro-arc oxidation layer, and use the surface roughness of the micro-arc oxidation layer to project a light source on the metal layer or the metal layer sputtered on the surface of the micro-arc oxidation layer The non-metallic layer has different reflection angles; and Spray a coating on the metal layer or non-metal layer. A surface structure of a magnesium alloy object, including: A substrate; Forming a micro-arc oxidation layer on the substrate, and the micro-arc oxidation layer has a rough surface; Disposing a metal layer or a non-metal layer on the micro-arc oxidation layer; and A coating is provided on the metal layer or the non-metal layer. A surface treatment method for magnesium alloy objects includes: Provide a magnesium alloy object; Performing a pretreatment on the magnesium alloy object; Performing a micro-arc oxidation treatment on the surface of the magnesium alloy object to generate a micro-arc oxidation layer; A paint layer is generated by electrophoretic coating (ED) treatment or chemical immersion or spray paint as the sealing layer of the micro-arc oxidation layer, and at the same time, using the appearance characteristics of the paint layer, at least one metal layer or At least one non-metallic layer; and Spray a coating on the metal layer or non-metal layer. A surface structure of a magnesium alloy object, including: A substrate; Forming a micro-arc oxidation layer on the substrate, and the micro-arc oxidation layer has a rough surface; Disposing a lacquer layer on the micro-arc oxidation layer, and disposing at least one metallic layer or at least one non-metallic layer on the lacquer layer; and A coating is provided on the metal layer or the non-metal layer. The surface treatment method of magnesium alloy object according to claim 1 or 3, wherein the surface roughness of the micro-arc oxidation layer is Ra0.5-2um with irregular holes. The surface treatment method for a magnesium alloy object according to claim 1 or 3, wherein the metal layer includes metals such as aluminum/stainless steel/titanium, and the non-metal layer includes titanium metal oxide or titanium oxynitride or silicon oxide. The surface treatment method of magnesium alloy object according to claim 1 or 3, wherein the light source projected on the metal layer or non-metal layer sputtered on the micro-arc oxidation layer has a different reflection angle of 0-180 degrees. According to the surface treatment method of magnesium alloy article according to claim 1 or 3, the coating is resin. The surface structure of the magnesium alloy object according to claim 2 or 4, wherein the surface roughness of the rough surface of the micro-arc oxidation layer is Ra0.5-2um irregular holes. The surface structure of the magnesium alloy object according to claim 2 or 4, wherein the metal layer includes metals such as aluminum/stainless steel/titanium, and the non-metal layer includes titanium metal oxide or titanium oxynitride or silicon oxide. The surface structure of the magnesium alloy object according to claim 2 or 4, wherein the metal layer or non-metal layer sputtered on the micro-arc oxidation layer by the light source has different reflection angles of 0-180 degrees. The surface structure of the magnesium alloy article according to claim 2 or 4, wherein the coating is resin. The surface structure of the magnesium alloy object according to claim 4, wherein the paint layer is formed by electrophoretic coating treatment, chemical solution immersion or spray paint treatment.

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