KR101383323B1 - Electroless plating method and plating film obtained by the electroless plating method - Google Patents

Abstract

According to the present invention, the step of electrolytic polishing the surface of the workpiece; Forming a first plating layer by subjecting the treated object to the electroplating treatment with a metal having a high degree of surface adhesion to the treated object; Forming a second plating layer on the first plating layer by electroless plating the workpiece including the first plating layer in a first electroless plating solution containing a metal salt; Electroless plating the object including the first and second plating layers in a second electroless plating solution containing a fluorine resin to form a third plating layer; Electrolytic ultrasonic degreasing treatment of the workpiece before the electropolishing step; Preserving passivation of the object by acid immersion treatment of the object after the electrolytic polishing step; And after the plating layer forming step of at least one of the first to third plating layers, immersing the workpiece in a neutralizing solution to stabilize the plating state of the workpiece.

Description

Electroless plating method and plating film obtained by the electroless plating method}

The present invention relates to electroless plating, and more particularly, to improve the uniformity of an object before the electropolishing step in the electroless plating in which an electroless plating film is formed by using an electroless plating on the surface of the electropolished object. After the electrolytic ultrasonic treatment, the electrolytic polishing step, the acid immersion treatment for the passivation of the workpiece and the stabilization treatment of the workpiece after formation of the plating layer are performed, thereby improving uniformity and high flatness of the workpiece. The present invention relates to an electroless plating method and an electroless plating target to allow electroless plating having a high adhesion.

In general, the fluorine resin has a very strong resistance to chemicals, excellent electrical properties, and stable at high temperatures, and thus a fluorine resin film is coated on surfaces of mechanical parts, electrical parts, and electronic parts.

Further, in order to improve the adhesion of the fluorine resin film to the object to be treated, the surface of the object is roughened in advance, and then a method of coating the fluorine resin film is generally performed. -328121, Japanese Patent Laid-Open No. 2000-328256, Japanese Patent Laid-Open No. 4-365875, Japanese Patent Laid-Open No. Hei 1-60584, Japanese Patent Laid-Open No. 61-234202, Japanese Patent Laid-Open No. 51- 1112348 and the like are treated with an inorganic or organic binder and then coated with a relatively thick fluorine resin so that the layer thickness is about 100 µm to 200 µm.

However, as described above, the method of coating the fluorine resin on the rough surface after roughly forming the surface of the object to be treated has the following problems depending on the uneven shape.

First, in the case where a rough surface having an uneven shape having a low height difference between the recess and the protrusion is formed such that the height is not so high as about 1 μm, the plating layer formed by the fluorine resin fills up the recess so that the height of the unevenness is almost eliminated and the adhesion of the fluorine resin is almost eliminated. There is a problem that this is significantly lowered and peeling or the like occurs.

In addition, since the fluorine resin is relatively expensive, there is a demand in the market to reduce the layer thickness of the fluorine resin, reduce the amount of the fluorine resin used, and increase the paper cost. However, simply thinning the coating of the fluororesin is extremely poor in adhesion due to the low coefficient of friction between the fluororesin and the workpiece, and it is impossible to form a fluororesin coating film which is likely to have pinholes in the coating and has a thin layer thickness. There is a problem.

In addition, the uniformity of the fluorine resin-coated treated object is reduced when oil, foreign matter or rust is present on the surface of the treated object when the roughened surface is formed while having the uneven shape. There is also a problem of deterioration.

In addition, International Publication No. WO 2004/024985 discloses a first plating layer by exposing a workpiece to a first plating solution containing at least one selected from a composition solution containing ammonia water and thiosulfate and thiourea. It is disclosed to form a thin film of the fluororesin coating film having good adhesion by forming a second plating layer by exposing to a second plating solution containing a fluororesin on the surface of the first plating layer.

However, the above-described prior art easily peels off the plating layer when the material to be processed is a noble metal, stainless steel, or molybdenum steel. That is, as shown in FIG. 1, the height difference between the protrusions 12 and the recesses 14 of the protrusions and protrusions formed on the surface of the workpiece 10 is so large that the pinholes are formed in the grooves when the first plating layer is formed. It occurs easily, and these pinholes act to increase the likelihood of peeling of the plating layer.

Therefore, in order to solve the above problems, Patent Publication No. 10-2007-0005332 discloses electrolytic polishing after roughening the surface of the workpiece before coating the fluorine resin film in order to improve the adhesion of the fluorine resin film to the object. When the first plating layer is formed after the height difference between the upper surface of the protrusion 12 and the bottom surface of the recess 14 is reduced, the first plating layer is formed immediately after the electropolishing treatment of the object. Since the preservation step of the passivation destroyed during the electropolishing treatment is not made, there is a problem that the activity in the electromotive system is lowered and corrosion progresses rapidly.

In addition, since all of the above-described prior arts have a fluorine resin film coated on the workpiece, the plating operation or the treatment is terminated. There is a problem that the life is shortened.

Accordingly, an object of the present invention is to improve the uniformity of an object by performing an electrosonic treatment before the electropolishing step in the electroless plating, which forms an electroless plated film using an electroless plating on the surface of the electropolished object. It is to provide an electroless plating method and an electroless plating to be processed.

In addition, another object of the present invention is an electroless plating method and an electroless plating to be treated by the acid immersion treatment for the passivation of the workpiece after the electrolytic polishing step to prevent the corrosion of the workpiece. To provide.

In addition, another object of the present invention is the electroless plating method and the electroless plating treatment which can improve the life of the workpiece or the plating material to proceed the stabilization step of the workpiece after formation of the fluorine resin coating plating layer or the plating layer. To provide water.

In addition, another object of the present invention is an electroless plating method and an electroless plating avoiding process, which allows an electroless plating having an improved uniformity, high flatness and very high adhesion through the above treatments. To provide a treatment product.

Meanwhile, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

To this end, according to the present invention, the step of electropolishing the surface of the workpiece; Forming a first plating layer by subjecting the treated object to the electroplating treatment with a metal having a high degree of surface adhesion to the treated object; Forming a second plating layer on the first plating layer by electroless plating the workpiece including the first plating layer in a first electroless plating solution containing a metal salt; Electroless plating the object including the first and second plating layers in a second electroless plating solution containing a fluorine resin to form a third plating layer; Electrolytic ultrasonic degreasing treatment of the workpiece before the electropolishing step; Preserving passivation of the object by acid immersion treatment of the object after the electrolytic polishing step; And after the plating layer forming step of at least one of the first to third plating layers, immersing the workpiece in a neutralizing solution to stabilize the plating state of the workpiece.

Here, in the electrolytic ultrasonic degreasing step, it is preferable to apply a current of about 4A to 6A for 2 minutes to 3 minutes in the electrolyte solution having a temperature of about 45 ℃ to 55 ℃ containing an alkali salt.

In addition, in the preservation of the passivation of the workpiece, it is preferable to immerse the workpiece in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 minutes to 25 minutes. .

In addition, in the stabilization treatment step of the workpiece, it is preferable to immerse the workpiece in a neutralizing solution containing a phosphate, a complexing agent and a stabilizer at room temperature for 5 minutes to 10 minutes.

The first plating layer may be a first nickel layer when the workpiece is stainless steel, the second plating layer is a second nickel layer, and the third plating layer is a third nickel layer containing fluorine resin. .

The first plating layer may be a zinc layer when the object is an aluminum alloy, the second plating layer is a first nickel layer, and the third plating layer is a second nickel layer containing a fluororesin.

On the other hand, according to this invention, the electroless-plated to-be-processed object processed by the said electroless-plating method is provided.

Therefore, according to the present invention, it is possible to improve the uniformity of the workpiece by allowing the electrolytic ultrasonic treatment to proceed before the electropolishing step.

In addition, the acid immersion treatment for passivation of the workpiece after the electropolishing step can be prevented from corrosion.

In addition, after the formation of the plating layer for the fluorine resin coating stabilization step of the workpiece to be carried out to improve the life of the workpiece or the plating.

Further, through the above treatments, it is possible to make the object to be subjected to electroless plating having improved uniformity, high flatness and very high adhesion.

On the other hand, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a cross-sectional view showing a surface state of a workpiece according to the prior art;
2 is a schematic diagram illustrating an electropolishing process in an electroless plating method according to a preferred embodiment of the present invention;
3 is a cross-sectional view showing the surface state of the workpiece according to a preferred embodiment of the present invention; And
4 is a cross-sectional view showing a state in which an electroless plating layer is coated on a workpiece according to a preferred embodiment of the present invention.

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

Figure 2 is a schematic diagram illustrating an electropolishing process in the electroless plating method according to a preferred embodiment of the present invention, Figure 3 is a cross-sectional view showing the surface state of the workpiece according to a preferred embodiment of the present invention, Figure 4 A cross-sectional view showing a state in which an electroless plating layer according to a preferred embodiment of the present invention is coated on a workpiece.

In the electroless plating method according to a preferred embodiment of the present invention, the step of electropolishing the surface of the object to be treated, the electropolishing treated object to a metal having a high surface adhesion (Adhesive force) to the object Forming a first plating layer by an electro-strike plating process, and electroless plating the first object layer on the first plating layer by electroless plating the object including the first plating layer in a first electroless plating solution containing a metal salt. Forming a third plating layer by electroless plating a workpiece including the first and second plating layers in a second electroless plating solution containing a fluorine resin, and before the electrolytic polishing step Removing the oil, foreign matter and rust, etc. of the object by electrolytic ultrasonic degreasing in a solution containing alkaline salts, and after the electrolytic polishing step The acid immersion treatment after the step and the third plated layer formation step to preserve the passivation of the target object to be processed by the immersion treatment in the neutralizing liquid includes the step of stabilizing the plating condition of the subject to be treated (or coated water).

In the electroless plating method, the electrolytic ultrasonic degreasing step, which is the first step, has a temperature of about 45 ° C. to 55 ° C. including alkali salts before the workpiece is subjected to electropolishing. After immersing in the electrolytic solution, a current of about 4A to 6A is added for 2 to 3 minutes to remove oil, foreign matter, rust, etc. present in the object, thereby improving uniformity of the object.

More preferably, it is preferable to apply a current of 5 A for 2 to 3 minutes in an electrolytic solution having a temperature of about 50 ° C. containing alkali salts, wherein, when the treatment conditions exceed the corresponding range, There is a problem that the corrosion is severely generated, if less than the range, there is a problem that the degreasing effect of the workpiece is reduced. Moreover, it is preferable that the said alkali salt is at least any one of sodium hydroxide, sodium carbonate, sodium metasilicate, sodium phosphate, sodium pyrophosphate, etc.

Therefore, according to the electrolytic ultrasonic degreasing process, which is the first process, foreign matters and the like present in the object to be processed can be removed, and the uniformity of the plated material (or the object to be processed) can be improved during the electroless plating process described below. have.

In the electroless plating method, the electrolytic polishing treatment process, which is the second process, as shown in FIG. 2, first, in a state in which the first electrode 20, the second electrode 30, and the electrolyte are prepared, the first electrode A positive voltage is connected to the object to be processed (20), that is, the object has a positive electrode, and a negative voltage is connected to the second electrode 30 so that the second electrode 30 acts as a cathode. do. Thus, as the voltage is applied to the first electrode 20 and the second electrode 30, the surface of the workpiece 20 serving as an anode is electrically polished. Specifically, the workpiece before electrolytic polishing ( The surface of 20) has a structure in which protrusions and recesses alternately appear, as shown in FIG. As mentioned above, the depth of the concave portion before the electropolishing is very deep, but as shown by the solid line even when the protrusion of the surface of the workpiece is polished intensively during the electropolishing process, the protrusion is smoothly polished so that the protrusion 22 The height difference between the top surface and the bottom surface of the recess 24 is reduced.

As a result, the possibility of pinhole generation in the recess is significantly reduced, and the adhesion between the surface of the workpiece and the plating layer is increased. Thus, the possibility of peeling of the plating layer is significantly lowered, so that the surface roughness of the object to be treated by which the electrolytic polishing treatment is completed is reduced and the gloss is significantly increased.

In the electroless plating method, the process of preserving the passivation of the to-be-processed object, which is the third step, is to prevent acid corrosion by preserving the passivation of the to-be-treated object by acid immersion treatment of the to-be-processed object. The treatment is immersed in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 to 25 minutes to prevent passive corrosion of the workpiece and to improve its activity in the electromechanical series. .

More preferably, the treatment object is immersed in 30% nitrate or an alkaline salt solution having a weight ratio of 5% for 20 minutes, wherein the treatment conditions passivation when the treatment conditions exceed the range There is a problem in that the film for preserving the film becomes relatively thick and the adhesion strength is lowered at the time of forming the plating layer. If the film is less than this range, the film is extremely thin and there is a problem in that the corrosion resistance cannot be improved.

Therefore, according to the passivation | preservation process of the to-be-processed object which is the said 3rd process, the passivation of the to-be-processed object can be preserve | saved and the corrosion resistance of a to-be-processed object can be improved.

In the electroless plating method, the electroless plating process, which is the fourth to sixth processes, is a process of plating the object to be treated three times, and is divided into one electroplating and two electroless platings.

Alternatively, after the completion of the third step, the sixth step, which is an electroless plating step containing fluorine resin, may be performed only once, without the fourth and fifth steps being omitted.

Alternatively, after the completion of the third process, the fifth process, the electroless plating process containing no fluorine resin, and the sixth process, the electroless plating process containing fluorine resin, may be performed once each.

Here, it is preferable that the said electroless plating liquid, ie, the plating liquid in a 5th process and a 6th process, is a composition liquid containing a metal salt, a metal complexing agent, a reducing agent, ammonia water, and a thiosulfate. In addition, electroless plating in the present invention refers to a method of plating on a workpiece without passing through a current.

In addition, although the base substrates made of various materials such as metal, aluminum, rubber, and synthetic resin may be used as the workpiece, preferably, products made of materials such as precious metal, stainless steel, and molybdenum steel are used.

In addition, the metal salts contained in the electroless plating solution include nickel salts, zinc salts, cobalt salts, chromium salts, titanium salts and hypophosphite salts, and the like, but may be used alone or in combination, but is not limited thereto. It is preferable that it is at least 1 sort (s) or more chosen from the group which consists of a nickel salt and a zinc salt.

As the metal complexing agent contained in the electroless plating solution of the present invention, it is preferable to use succinic acid, succinic acid or lactic acid as an organic substance or the like which forms a complex with a metal salt.

In addition, in this invention, a fluororesin refers to resin containing a fluorine group, and can use fluororesins, such as polytetrafluoroethylene (PTFE). In addition, the concentration of the fluorine resin in the electroless plating solution of the sixth step may be arbitrarily selected according to the use.

Meanwhile, in the present invention, a surfactant that functions as a dispersant of the fluororesin and prevents precipitation of the complexed material may be further included in the sixth step. The surfactant may be a cationic surfactant and a nonionic surfactant. It is preferable to use at least one of the group consisting of. The cationic surfactants include fourth ammonia, second ammonia, third amines, and indazolines, and nonionic surfactants include polyoxyethylene, polyethylene, carboxylic acid, and sulfones. Although acidic nonionic surfactant can be used, it is not limited to this. Moreover, it is also preferable to use the fluorine surfactant which has a bond of a carbon element or a fluorine atom in a molecule | numerator. In addition, it is preferable that the electroless plating solution of the sixth step preferably contains a dispersing aid in order to further improve the penetration of the fluororesin into the second plating layer of the fifth step. Such dispersion aids include, but are not limited to, cerium oxide and silicon carbide.

The electroless plating step of the present invention, that is, the fifth step and the sixth step can be carried out in the same manner as the electroless plating method usually performed in the plating industry.

Therefore, in the object to be plated by the electroless plating method according to the present invention, the film thickness of the first plating layer is selected to an appropriate thickness for adhesion with the object, and the second plating layer and the third plating layer Each film thickness is preferably selected in consideration of the hardness and cost of the plated film, and the plated workpiece obtained by the above method is electropolishing and protection, as shown in FIG. The presence of the layer 21 results in excellent adhesion to the workpiece 20.

In the electroless plating method, the stabilization treatment step, which is a seventh step, includes forming a plating layer of at least one of the first to third plating layers, and then treating the object with a neutralizing solution including a phosphate, a complexing agent, and a stabilizer. 5 to 10 minutes at room temperature to stabilize the plating state of the workpiece (or plated) and to prevent the deposition of foreign matter on the surface of the workpiece to have a stable state of the plated workpiece. It is possible to prevent the shortening of the lifetime by making the electrode potential appear normally.

Hereinafter, although the electroless plating method which concerns on a preferable Example of this invention, and the specific example of the to-be-processed object by this method are shown, this Example is an illustration of embodiment of this invention, It is not limited to this at all.

Example 1

First, by immersing a to-be-processed object such as a stainless plate in an electrolytic solution having a temperature of about 45 ℃ to 55 ℃ containing an alkali salt, and then by applying a current of about 4A to 6A for 2 minutes to 3 minutes Make sure that oil, dirt and rust that are present in the treated product are removed.

Subsequently, after immersing the stainless plate and the other metal plate in the electrolytic polishing electrolyte, the stainless plate is applied with a positive voltage to act as a positive electrode and the other metal plate is applied with a negative voltage to act as a cathode, so that the surface of the stainless plate is electrolytically The surface of the protrusions is intensively polished so that the height between the recesses and the protrusions is reduced than before polishing.

Thereafter, the treated stainless plate is immersed in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 minutes to 25 minutes to preserve the passivation of the processed object.

Thereafter, the stainless plate is extracted in an electroless plating solution maintained at 86 ° C. for a predetermined time, washed with water, and dried under normal temperature to form a plating layer having a predetermined thickness on the stainless plate.

At this time, the electroless plating solution is made to contain nickel lactate as the metal salt, sodium hypochlorite as the reducing agent, and polytetrafluoroethylene (PTEF) as the fluorine resin, and the surface of the plating layer has a flat state by PTEF.

Thereafter, the plated layer deposited on the surface of the stainless plate formed on the surface of the furnace maintained at 300 ℃ or more, and left for 60 minutes to bake, and then neutralized with phosphate, complexing agent and stabilizer at room temperature for 5 minutes. It is immersed for about 10 minutes, so that the to-be-processed object in which the thin film by electroless plating was formed in the surface is completed.

Here, the final to-be-processed workpiece has a very high flatness and plating adhesion density compared to that of the prior art.

Example 2

First, the object to be treated, such as a stainless steel plate, is immersed in an electrolytic solution having a temperature of about 45 ° C to 55 ° C containing alkali salts, and then a current of about 4A to 6A is added to the electrolyte solution for 2 to 3 minutes. Remove oil, foreign substances and rust from water.

Subsequently, after immersing the stainless plate and the other metal plate in the electrolytic polishing electrolyte, the stainless plate is applied with a positive voltage to act as a positive electrode and the other metal plate is applied with a negative voltage to act as a cathode, so that the surface of the stainless plate is electrolytically The surface of the protrusion is intensively polished so that the height between the recess and the protrusion is reduced than before grinding.

Thereafter, the treated stainless plate is immersed in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 minutes to 25 minutes to preserve the passivation of the processed object.

Then, the stainless plate is nickel chloride 220g / L to 250g / L, hydrochloric acid (specific gravity 1.18) 110ml / L to 140ml / L, current density 5A / dm 2 to 10A / dm 2 for 1 minute to 10 minutes at room temperature in an electric plating solution Extracted in the immersed state, washed with water and left to dry in a room temperature environment to form a first nickel plating layer of a protective layer of a predetermined thickness on the surface of the stainless plate.

Subsequently, the stainless plate having the first plating layer is further extracted in a state of being immersed in an electroless plating solution maintained at 86 ° C. for a predetermined time, washed with water, dried under a room temperature environment, and then predetermined on the first nickel plated layer of the stainless plate. A second nickel plated layer of thickness is formed.

At this time, the electroless plating solution is made to contain nickel lactate as the metal salt, sodium hypochlorite as the reducing agent, polytetrafluoroethylene (PTEF) as the fluorine resin, and the surface of the second nickel plating layer is flat by PTEF. To have.

Thereafter, the first and second nickel plated layers are placed in a furnace in which a stainless plate deposited on the surface is kept at an elevated temperature of 300 ° C. or higher, and left to stand for 60 minutes for baking, followed by neutralization including a phosphate, a complexing agent, and a stabilizer. The solution is immersed for about 5 to 10 minutes at room temperature, so that the to-be-processed object in which the thin film by electroless plating is formed on the surface is completed.

Here, the final to-be-processed workpiece has a very high flatness and plating adhesion density compared to that of the prior art.

Example 3

First, the object to be treated, such as a stainless steel plate, is immersed in an electrolytic solution having a temperature of about 45 ° C to 55 ° C containing alkali salts, and then a current of about 4A to 6A is added to the electrolyte solution for 2 to 3 minutes. Remove oil, foreign substances and rust from water.

Subsequently, after immersing the stainless plate and the other metal plate in the electrolytic polishing electrolyte, the stainless plate is applied with a positive voltage to act as a positive electrode and the other metal plate is applied with a negative voltage to act as a cathode, so that the surface of the stainless plate is electrolytically The surface of the protrusion is intensively polished so that the height between the recess and the protrusion is reduced than before grinding.

Thereafter, the treated stainless plate is immersed in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 minutes to 25 minutes to preserve the passivation of the processed object.

Then, the stainless plate is nickel chloride 220g / L to 250g / L, hydrochloric acid (specific gravity 1.18) 110ml / L to 140ml / L, current density 5A / dm 2 to 10A / dm 2 for 1 minute to 10 minutes at room temperature in an electric plating solution Extracted in the immersed state, washed with water and left to dry in a room temperature environment to form a first nickel plating layer of a protective layer of a predetermined thickness on the surface of the stainless plate.

Thereafter, the stainless steel plate was immersed in a first electroless plating solution containing nickel lactic acid as a metal salt, sodium charine as a reducing agent, nitric acid, succinic acid or lactic acid as a complexing agent, a regulator, a pH regulator, and the like, and then The plate is extracted from the first electroless plating solution, washed with water and left to dry in an ambient temperature environment so that a second nickel plating layer having a predetermined thickness is formed on the surface of the stainless plate.

Subsequently, the stainless plate having the second nickel plated layer was further extracted in a state of being immersed in a second electroless plating solution maintained at 86 ° C. for a predetermined time, washed with water, dried under an ambient temperature environment, and then on the second plated layer of the stainless plate. The third plating layer having a predetermined thickness is formed on the substrate.

At this time, the second electroless plating solution is made to contain nickel lactate as the metal salt, sodium hypochlorite as the reducing agent, and polytetrafluoroethylene (PTEF) as the fluorine resin, and the surface of the second nickel plating layer is flat by PTEF. You have a state.

Thereafter, the first to third plating layers are placed in a furnace in which a stainless plate deposited on the surface is kept at an elevated temperature of 300 ° C. or higher, left to stand for 60 minutes, and then baked, and then neutralized with a phosphate, a complexing agent, and a stabilizer. After immersion for about 5 minutes to 10 minutes at room temperature, the to-be-processed object in which the thin film by electroless plating was formed on the surface is completed.

Here, the final to-be-processed workpiece has a very high flatness and plating adhesion density compared to that of the prior art.

Therefore, according to the electroless plating method and the electroless plating object as described above, the electrolytic ultrasonic treatment can be performed before the electropolishing step, thereby improving the uniformity of the object.

In addition, the acid immersion treatment for passivation of the workpiece after the electropolishing step can be prevented from corrosion.

In addition, after the formation of the plating layer for the fluorine resin coating stabilization step of the workpiece to be carried out to improve the life of the workpiece or the plating.

Further, through the above treatments, it is possible to make the object to be subjected to electroless plating having improved uniformity, high flatness and very high adhesion.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that the invention may be embodied otherwise. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (7)

delete Electrolytic polishing the surface of the workpiece;
Forming a first plating layer by subjecting the treated object to the electropolishing treatment with an electric strike plating process;
Forming a second plating layer on the first plating layer by electroless plating the workpiece including the first plating layer in a first electroless plating solution containing a metal salt;
Electroless plating the object including the first and second plating layers in a second electroless plating solution containing a fluorine resin to form a third plating layer;
Electrolytic ultrasonic degreasing treatment of the workpiece before the electropolishing step;
Preserving passivation of the object by acid immersion treatment of the object after the electrolytic polishing step; And
After the plating layer forming step of at least one of the first to third plating layer comprising the step of immersing the workpiece in a neutralizing solution to stabilize the plating state of the workpiece,
The electrolytic ultrasonic degreasing step,
Electroless plating method characterized in that 4A to 6A current is added for 2 to 3 minutes in an electrolytic solution having a temperature of 45 ℃ to 55 ℃ containing an alkali salt. Electrolytic polishing the surface of the workpiece;
Forming a first plating layer by subjecting the treated object to the electropolishing treatment with an electric strike plating process;
Forming a second plating layer on the first plating layer by electroless plating the workpiece including the first plating layer in a first electroless plating solution containing a metal salt;
Electroless plating the object including the first and second plating layers in a second electroless plating solution containing a fluorine resin to form a third plating layer;
Electrolytic ultrasonic degreasing treatment of the workpiece before the electropolishing step;
Preserving passivation of the object by acid immersion treatment of the object after the electrolytic polishing step; And
After the plating layer forming step of at least one of the first to third plating layer comprising the step of immersing the workpiece in a neutralizing solution to stabilize the plating state of the workpiece,
Preserving the passivation of the object,
Electroless plating method characterized in that the treated material is immersed in an alkaline salt solution having a weight ratio of 25% to 35% nitrate or 4% to 6% hydrochloride for 15 minutes to 25 minutes. Electrolytic polishing the surface of the workpiece;
Forming a first plating layer by subjecting the treated object to the electropolishing treatment with an electric strike plating process;
Forming a second plating layer on the first plating layer by electroless plating the workpiece including the first plating layer in a first electroless plating solution containing a metal salt;
Electroless plating the object including the first and second plating layers in a second electroless plating solution containing a fluorine resin to form a third plating layer;
Electrolytic ultrasonic degreasing treatment of the workpiece before the electropolishing step;
Preserving passivation of the object by acid immersion treatment of the object after the electrolytic polishing step; And
After the plating layer forming step of at least one of the first to third plating layer comprising the step of immersing the workpiece in a neutralizing solution to stabilize the plating state of the workpiece,
The stabilization treatment step of the workpiece,
Electroless plating method characterized in that the processed material is immersed in a neutralizing solution containing a phosphate, complexing agent and stabilizer for 5 minutes to 10 minutes at room temperature. The method of any one of claims 2 to 4, wherein the first plating layer is a first nickel layer when the workpiece is stainless steel, the second plating layer is a second nickel layer, and the third plating layer is fluorine. An electroless plating method comprising a third nickel layer containing a resin. The method of claim 2, wherein the first plating layer is a zinc layer when the workpiece is an aluminum alloy, the second plating layer is a first nickel layer, and the third plating layer is a fluororesin. Electroless plating method characterized in that the second nickel layer containing. An electroless plating target object, which is treated by the electroless plating method according to any one of claims 2 to 4.

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