KR100899010B1 - Manufacturing Method for Material having Color Oxide Layer with High Corrosion-resistance on Ni Plating Layer - Google Patents

Abstract

According to the present invention, the electroless Ni plating treatment is performed on the surface of the material, followed by oxidative heat treatment to form a color oxide film layer, thereby providing a high corrosion resistance color oxide film layer on the surface of the Ni plating layer having excellent corrosion resistance and excellent abrasion resistance as well as uniform color tones. It relates to a method for producing a metal material having a.

The present invention comprises the steps of (a) electroless Ni plating on a metal material; (b) performing an aging heat treatment on the surface of the material after the step (a); (c) performing surface processing after the step (b); And (d) a color oxidation process step for forming a color oxide film layer on the surface of the material by oxidative heat treatment for 1 second to 5 hours in an oxidizing atmosphere of 200 ° C. to 1200 ° C. after the step (c).

Ni plating, electroless, color oxide layer, high corrosion resistance, high wear resistance

Description

Manufacturing Method for Material having Color Oxide Layer with High Corrosion-resistance on Ni Plating Layer

1 is a procedure showing a method of manufacturing a metal material having a highly corrosion-resistant color oxide film layer on the surface of the Ni plating layer according to an embodiment of the present invention.

The present invention relates to a method of manufacturing a metal material having a high corrosion-resistant color oxide film layer on the surface of the Ni plating layer, and more particularly, has high corrosion resistance and wear resistance, high glossiness, and uniform and various color tones. The present invention relates to a method for producing a metal material having a high corrosion resistant color oxide film layer on an excellent Ni plating layer surface.

In recent years, as the industry develops and the life is improved, the color metal materials reflecting various color concepts that can be applied to various household goods, decorations, metal crafts, etc., while still retaining the unique characteristics of metals. As demand increases, attempts have been made to obtain color tints by forming color oxide films on metal materials.

On the other hand, a method of forming a color oxide film layer on the metal material is conventionally painted by color coating on the surface of the metal material by color, zinc plating, gold plating, chromium plating or the like, or coated with a color coating composition After the heat treatment to express the color has been used.

However, the method of forming the color oxide film layer on the conventional metal material has a high processing cost or has limitations in implementing various colors, and wear and peeling of the coating layer due to cleaning, repeated contact with foreign substances, and scratches after manufacture. There is a problem that the color is aging due to a change in color or gloss due to such a deterioration.

In addition, the above-described conventional manufacturing method was able to obtain a metal material formed with a color oxide film layer of various colors, but there was a problem of poor corrosion resistance.

Accordingly, the present invention has been made to solve the problems of the prior art, and is a metal having a high corrosion resistance color oxide film layer on the surface of the Ni plating layer having a high gloss and high corrosion resistance while being economical with low processing cost, and having various colors. The purpose is to provide a method of manufacturing the material.

Other objects and advantages of the present invention will be described below, and will be appreciated by the embodiments of the present invention.

In order to achieve the above object, the present invention (a) Ni-plating the material; (b) performing surface processing after the step (a); And (c) a color oxidation process step of forming a color oxide film layer on the surface of the material by oxidative heat treatment for 1 second to 5 hours in an oxidizing atmosphere of 200 ° C. to 1200 ° C. after the step (b). Provided is a method for producing a metal material having a high corrosion resistant color oxide film layer on a Ni plated layer surface.

In addition, the present invention may be subjected to an aging treatment on the surface of the material as needed after the step (a).

On the other hand, the Ni plating of the step (a) is preferably electroless Ni plating in order to ensure sufficient corrosion resistance and wear resistance, the electroless Ni plating at this time is electroless Ni plating, for example electroless Ni-P plating, electroless Electroless Ni plating method such as Ni-B plating, Ni-Co plating, Ni-Co-P plating, Ni-Co-B plating, Ni-Fe-P plating, Ni-WP plating etc. based on such plating You can also process

Further, the material of step (a) may include all metals of iron-based, or aluminum and alloys thereof, copper and alloys thereof, zinc and alloys thereof, but is not limited thereto and may be electroless Ni plating. There is no special limitation.

And, the surface processing of step (b) can be processed by at least one method selected from buffing, lapping, polishing, polishing and electropolishing, but other special limitations if the processing method that can control the surface roughness of the material There is no

In addition, the heat treatment furnace for performing the oxidation heat treatment in the color oxidation process step in the step (c) comprises a pit type furnace, a sealed quench furnace, an oil phase furnace, one or more chambers. It is preferable to use any one selected from a continuous furnace and a high frequency induction furnace of a high frequency induction heating method. However, the oxidation heat treatment apparatus is not particularly limited as long as the above heat treatment process conditions are satisfied.

The present invention is composed of the electroless Ni plating step, the aging heat treatment step, the surface processing step, and the color oxidation process step of forming a color oxide film layer through the oxidation heat treatment of the material subjected to this step, the color is diverse and wear-resistant The metal material with high corrosion resistance can be manufactured.

However, the aging heat treatment is performed at the same time as the color temperature of the material by the oxidation heat treatment of the electroless Ni plating layer in the color oxidation process step of 200 ° C to 1200 ° C, depending on the processing temperature during the oxidation heat treatment. In some cases, the aging heat treatment process may be omitted depending on the oxidation heat treatment temperature.

That is, the color expression process in the color oxidation process step for forming a high wear and high corrosion resistance color oxide film layer on the surface of the Ni plating layer according to the present invention is electroless Ni plating, aging heat treatment, The surface treatment may be performed in the order of oxidation heat treatment, or the oxidation heat treatment performed simultaneously with electroless Ni plating, surface treatment, and aging heat treatment.

In addition, according to the present invention, the color of the color oxide film layer formed after the oxidation heat treatment may be expressed in gold, purple, blue and light green, black, etc. according to the oxidation heat treatment temperature, time, and the oxidation heat treatment atmosphere.

As described above, in the present invention, since the color oxide film layer is formed by performing an oxidative heat treatment using an oxidizing gas, it is possible to realize a variety of decorative colors that cannot be expressed by the conventional method, and the surface oxidation formed at this time. The main component of the coating layer is Ni oxide, which has a high hardness, so that surface defects are unlikely to occur when using a product or a component, and gloss or corrosion resistance does not occur.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a procedure showing a method of manufacturing a metal material having a highly corrosion-resistant color oxide film layer on the surface of the Ni plating layer according to an embodiment of the present invention.

Referring to the drawings, first, a method of manufacturing a metal material having a high corrosion-resistant color oxide film layer according to a preferred embodiment of the present invention is subjected to a Ni plating process on the material (S10).

In this case, the Ni plating is preferably electroless Ni plating. The reason is that the electric Ni plating layer has a hardness of 200 to 500 Hv in the plating state, and when oxidized and heat-treated at 250 to 500 ° C., the hardness is about 200 to 300 Hv, so that scratches, scratches, scratches, etc. are easily generated and the wear resistance is low. Ni plating has a high hardness of 700 ~ 1100Hv during oxidizing heat treatment, and the glossiness varies depending on the surface processing or plating condition, but the uniformity of plating is good, and it does not generate any scratches, scratches, scratches, etc. Because.

On the other hand, after the Ni plating process on the surface of the material as described above, the aging (aging) heat treatment as necessary (S20).

In the electroless Ni plated material, the Ni plating layer is amorphous, and when aging heat-treated, the Ni, P, B, and alloy compounds precipitate and the hardness becomes high.

At this time, the hardness varies depending on the heat treatment temperature, but in the Ni-plated state, it is about 500 Hv. When the aging heat treatment is performed at 400 ° C., a maximum hardness of about 1100 Hv is obtained according to the type of electroless Ni plating. For reference, since the treated material has higher wear resistance as hardness increases, the Ni plating layer is less damaged by washing, repeated contact with foreign matter, scratches, and the like, and problems such as deterioration of corrosion and color gloss can be eliminated.

On the other hand, the temperature during the aging heat treatment is preferably at 400 ℃, this is because the hardness is lowered when the aging heat treatment temperature is lower or higher than 400 ℃.

Accordingly, the aging heat treatment may be selectively performed according to the oxidation heat treatment temperature during the oxidation heat treatment, which is a subsequent process. Specifically, if the oxidation heat treatment temperature during the oxidation heat treatment is higher than 400 ° C., The aging heat treatment does not require aging heat treatment because the hardness is lowered during the oxidizing heat treatment step. On the other hand, when the oxidation heat treatment temperature is lower than 400 ° C., the aging heat treatment needs to be performed at 400 ° C. to obtain the maximum hardness.

Then, after performing the oxidation heat treatment, which is a subsequent process, surface processing is performed to obtain a uniform and beautiful color color (S30).

The surface processing is preferably performed by one method selected from polishing, polishing, lapping, buffing, and electropolishing, but other surface processing may also be performed, and the roughness after surface processing is preferably Ra 2.0 μm or less.

After the surface treatment is subjected to the oxidation heat treatment color oxidation process (S40).

In the color oxidation process, an oxidation heat treatment is performed on a surface of a plating layer to form a color oxide film layer so that various colors may be formed due to a difference in interference effects of light according to the thickness of the color oxide film layer. According to the color to be described, it is preferable that the temperature at which the oxidative heat treatment is performed under an oxidizing atmosphere is performed in the range of 200 ° C to 1200 ° C for 1 second to 5 hours.

The reason is that when the temperature of the oxidation heat treatment is lower than 200 ° C., the oxidation heat treatment is not sufficiently performed to obtain a desired color oxide film layer, and when it exceeds 1200 ° C., the color remains black even after a short time heating. Color adjustment is not easy

On the other hand, as the oxidation heat treatment temperature is higher, an oxide layer having a predetermined thickness is formed even when heated for a short time, and thus the oxidation heat treatment temperature and time can be appropriately adjusted according to the color to be expressed and the amount of the product to be put into the oxidation heat treatment furnace.

In addition, the oxidizing atmosphere for forming a color oxide film layer on the surface of the plating layer in the oxidation heat treatment step may be used alone or mixed with any oxidizing gas such as oxygen, air, carbon dioxide, steam, and other nitrogen gas and argon to the oxidizing gas. It may include a gas.

On the other hand, the heat treatment furnace for performing the color oxidation heat treatment is selected from a pit type furnace, a sealed quench furnace, a fluidized bed furnace, or any continuous furnace composed of one or more chambers. Although it can be applied, other heat treatment can be used as long as it can satisfy the oxidation heat treatment condition.

In addition, a color oxide film layer may be formed by applying a high frequency induction heating method in addition to the oxidation heat treatment method. When the high frequency induction heating method is applied, the material may be heated to a predetermined temperature within a short time. Can express the desired color in a short time of about 1 second to 30 minutes.

Then, the color of the color oxide film layer formed after the oxidation heat treatment is expressed by the oxidation of the electroless Ni plating layer, and according to the oxidation heat treatment conditions, depending on the oxidation heat treatment temperature, time, oxidation heat treatment atmosphere, gold, violet, blue, It may be expressed as a light green color and a black color, and an intermediate color of each color may also be expressed.

As described above, the method of manufacturing a metal material having a highly corrosion-resistant color oxide film layer according to the present invention can realize a variety of colors that cannot be expressed by the heat treatment method and plating method after the conventional coating, the price is low, and the surface scratches This color does not occur very well, and it is possible to realize a color color with excellent decoration, and its color is diverse, and it has excellent resistance to abrasion, corrosion, or gloss, and its use is variously applied to indoor and outdoor decorative parts or materials, door handles, faucets, and other household goods. Can be applied.

Example 1

After electroless Ni plating on steel pipes with diameter of 27.8mm, thickness 0.8mm, length 300mm, aging heat treatment and buffing at 400 ℃ for 1 hour, the roughness was Ra 0.04㎛, and the pipes were subjected to oxidation heat treatment for 2 hours in an air atmosphere at 320 ℃. As a result, a gold colored oxide film layer was formed.

(Example 2)

After electroless Ni-Fe-P plating on 50mm × 80mm × 1.0t copper plate, and after 1 hour aging heat treatment and electropolishing at 400 ℃, the roughness was Ra 0.08㎛ and the plate was oxidized for 2 hours in an air atmosphere at 360 ℃. As a result of the heat treatment, a blue colored oxide film layer was formed.

(Example 3)

  Electroless Ni-B plating on steel handles for home use, aging treatment at 400 ℃ for 1 hour, and roughness was Ra 1.0㎛. The handle was oxidized heat treatment for 2 hours in air atmosphere at 345 ℃. A color oxide film layer was formed.

(Example 4)

Electroless Ni-P plated on a steel joint with a weight of 110g and a thickness of 2.0t, an aging heat treatment at 400 ° C. for 1 hour and an oxidation heat treatment at 360 ° C. for 2 hours in an air atmosphere, followed by a blue colored oxide film layer. Was formed.

As described above, according to the method of the present invention, it is possible to implement a variety of colors that can not be expressed by the heat treatment method, the plating method after the conventional coating, the price is low, surface scratches do not occur well, color color with excellent decoration Can be implemented. In detail, the following effects are provided.

First, the surface hardness is higher than that of the conventional method, so surface flaws and abrasion do not easily occur even after repeated contact, thereby preventing deterioration of corrosion resistance and gloss.

Second, because it can implement a variety of color colors that can not be expressed by the conventional method, the color is diverse and beautiful, and the decoration is excellent, its uses are various.

Third, manufacturing cost is low because color colors can be implemented in a simple process compared to the conventional method.

Claims (7)

(a) electroless Ni plating on a metal material; (b) performing an aging heat treatment on the surface of the material after the step (a); (c) performing surface processing after the step (b); And (d) a color oxidation process step for forming a color oxide film layer on the surface of the material by oxidative heat treatment for 1 second to 5 hours in an oxidizing atmosphere at 200 ° C. to 1200 ° C. after the step (c). Method for producing a metal material having a high corrosion-resistant color oxide film layer on the surface of the Ni plating layer. delete The method of claim 1, The electroless Ni plating is electroless Ni-P plating, electroless Ni-B plating, Ni-Co plating, Ni-Co-P plating, Ni-Co-B plating, Ni-Fe-P plating, Ni-WP plating Method for producing a metal material having a high corrosion-resistant color oxide film layer on the surface of the Ni plating layer, characterized in that any one selected from the group consisting of. delete The method of claim 1, The metal material of step (a) is an iron-based alloy, or a non-ferrous alloy selected from the group consisting of aluminum alloy, copper alloy and zinc alloy, characterized in that the Ni material layer has a high corrosion-resistant color oxide film layer on the surface of the Ni plating layer. The method of claim 1, The surface processing of the step (c) is at least one selected from buffing, lapping, polishing, polishing and electropolishing method of producing a metal material having a high corrosion-resistant color oxide film layer on the Ni plating layer surface. The method of claim 1, The heat treatment furnace which performs the oxidation heat treatment in the color oxidation process step in the step (d) is a pit type furnace, a sealed quench furnace, a fluidized bed furnace, and a continuous furnace composed of one or more chambers. And a high corrosion resistance color oxide film layer on the surface of the Ni plating layer, characterized in that any one selected from high frequency induction method of high frequency induction heating method.

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