WO2018152998A1

WO2018152998A1 - Stainless steel and plastic combined piece and processing method therefor

Info

Publication number: WO2018152998A1
Application number: PCT/CN2017/090631
Authority: WO
Inventors: 张法亮; 董晓佳; 王成; 张孟军; 刘鸿章; 唐红平; 刘利强; 李文涛
Original assignee: 歌尔股份有限公司
Priority date: 2017-02-23
Filing date: 2017-06-28
Publication date: 2018-08-30
Also published as: CN107009570A; CN107009570B

Abstract

A stainless steel and plastic combined piece comprising a stainless steel substrate (1). The stainless steel substrate is provided on the surface thereof with honeycomb pores (11). The stainless steel substrate is provided on the surface thereof with a nitrided layer by means of a solid solution nitriding treatment. The thickness of the nitrided layer is greater than 10 nm. A plastic material (2) is injection molded on the stainless steel substrate. The plastic material is embedded into the honeycomb pores. Also disclosed is a processing method for the stainless steel and plastic combined piece. The combined piece increases the binding force between the stainless steel substrate and the plastic material.

Description

Combination of stainless steel and plastic and processing method thereof

Technical field

The invention relates to the technical field of material processing, in particular to a joint of stainless steel and plastic and a processing method thereof.

Background technique

With the gradual development of materials technology, more and more products use metal and plastic composite forms to form the product structure. This structural design can achieve rich functional effects. For example, in the case where the appearance of the product is required to exhibit metal features and the internal structure needs to be reduced in weight and material cost, a metal-plastic composite design can be used.

Traditional combinations of metal and plastic include adhesive bonding, snap-fit or rivet attachment. However, the conventional composite method has defects such as low composite reliability and a need to increase the fixed connection mechanism. With the development of technology, a composite method of injection molding plastic on a metal surface has appeared in the prior art. In the plastic injection molding process, the plastic is directly injection molded on the metal material using the metal material as a substrate. However, the bonding force between metal and plastic is limited, there is a risk of falling off between the two, and the composite reliability is difficult to improve.

Therefore, it is necessary to improve the composite process of metal and plastic materials, improve the structural reliability of the material composite, or simplify the structure of the finished product, and reduce the addition of additional components to the product.

Summary of the invention

It is an object of the present invention to provide a new technical solution for the composite of stainless steel and plastic.

According to a first aspect of the present invention, there is provided a joint of stainless steel and plastic, the joint comprising a stainless steel substrate having a honeycomb-shaped pore formed on a surface thereof, a surface layer of the stainless steel substrate The nitriding layer is formed by solid solution nitriding treatment, and the nitriding layer has a large thickness At 10 nm, the stainless steel substrate is injection molded with a plastic material embedded in the honeycomb pores.

Optionally, the temperature of the solution nitriding treatment ranges from 100 to 1100 degrees Celsius, and the nitriding atmosphere includes at least one of nitrogen and ammonia.

Preferably, the nitrided layer has a thickness of from 10 to 1000 nm.

Optionally, the honeycomb pores have an average pore diameter ranging from 10 nm to 6 μm, and the honeycomb pores extend from the surface of the stainless steel substrate to the inside with an average depth ranging from 10 nm to 8 μm.

Optionally, the plastic material comprises a thermoplastic resin and a filler material, the filler material is 5-40% by mass in the plastic material, and the filler material comprises nylon fiber, carbon fiber, glass fiber, aromatic poly At least one of amide fibers, calcium carbonate, magnesium carbonate, silica, and clay.

Preferably, the thermoplastic resin includes at least one of a polyphenylene sulfide resin, a polybutylene terephthalate resin, a polyamide, a polycarbonate, and a polyolefin.

The present invention also provides a method for processing a joint of stainless steel and plastic, providing a stainless steel substrate; forming a honeycomb pore on the surface of the stainless steel substrate; and subjecting the stainless steel substrate to solution nitriding treatment, Forming a nitriding layer on the surface of the stainless steel substrate, the nitriding layer having a thickness greater than 10 nm, molding a plastic material on the surface of the stainless steel substrate, and embedding a partial structure of the plastic material in the honeycomb pores to form a stainless steel Integrated with plastic.

Optionally, the nitriding treatment has a temperature in the range of 100-1100 degrees Celsius, and the nitriding atmosphere includes at least one of nitrogen and ammonia.

Alternatively, the stainless steel substrate is placed in an acid pickling solution having a volume fraction of 10-30% prior to the solid solution nitriding treatment.

Alternatively, after the solution nitriding treatment is completed, the stainless steel substrate is placed in a protective gas for rapid cooling.

Optionally, after the solution nitriding treatment, the stainless steel substrate is subjected to a boring treatment, and the stainless steel substrate is immersed in the porogen, and then taken out and dried. The boring agent comprises: terephthalic acid, ethylenediamine At least one of tetraacetic acid, p-nitrobenzenesulfonic acid, water-soluble amino acid, ethylenediamine, triethanolamine, aqueous ammonia, ethyl chloride, and epichlorohydrin.

Optionally, a honeycomb pore is formed on the stainless steel substrate by chemical etching, and the stainless steel substrate is immersed in a chemical etching solution of 30-90 degrees Celsius for 10 to 120 minutes, and the chemical etching solution comprises: sulfuric acid, nitric acid, At least one of phosphoric acid, hydrofluoric acid, boric acid, formic acid, propionic acid, butyric acid, alginic acid, oxalic acid, citric acid, and caprolactam.

Optionally, the honeycomb pores are formed on the stainless steel substrate by electrochemical etching, and the stainless steel substrate is used as an anode to electrochemically etch the region of the plastic material to be injection molded, and the electrochemical etching voltage ranges from 5 to 60 V. The duration is 10-100 minutes.

The inventors of the present invention have found that in the prior art, there is no technical solution for improving the composite manner of stainless steel and plastic materials. There has also been no improvement in the composite of metal and plastic materials using a nitriding process. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a schematic structural view of a joint of stainless steel and plastic provided by the present invention;

2 is a schematic view showing the topographical features of the honeycomb pores provided in an embodiment of the present invention;

3 is a schematic view showing a joint of a stainless steel substrate and a plastic material in the tensile test of the present invention;

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but the techniques, methods and apparatus should be considered as part of the specification, where appropriate.

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The present invention provides a combination of stainless steel and plastic that includes a stainless steel substrate and an injection molded plastic. As shown in FIG. 1, a honeycomb-like pore 11 is formed on the surface of the stainless steel substrate 1, and the honeycomb-shaped pores 11 have a nano-scale pore structure. Alternatively, the honeycomb pores 11 may be formed only in a region on the stainless steel substrate 1 where the plastic material 2 needs to be injection molded. Alternatively, the honeycomb pores 11 may be formed on the entire surface of the stainless steel substrate 1.

Specifically, a nitriding layer is formed on the surface of the stainless steel substrate 1, and the nitriding layer is formed by solid solution nitriding treatment. In a specific embodiment of the invention, the following nitriding treatment step can be employed.

The stainless steel substrate is placed in a heat treatment apparatus and heat treated in a high temperature environment for a certain period of time. The heat treatment equipment is filled with nitrogen gas to ensure that the nitrogen pressure reaches the nitriding requirement. A nitrided layer is formed at least on the surface of the honeycomb pores. After the nitriding process is completed, the stainless steel substrate is cooled. Optionally, the temperature of the solid solution nitriding treatment ranges from 100 to 1100 degrees Celsius, and the pressure of the nitrogen gas in the solid solution nitriding treatment heat treatment device ranges from 0.1 to 2.0 MPa. Preferably, the nitrided layer has a thickness greater than 10 nm, and the nitrogen atomic mass content of the surface of the nitrided layer is greater than 0.01% by weight.

Preferably, the nitriding layer further includes a solid solution nitrogen atom. Preferably, the nitrided layer has a thickness ranging from 10 to 1000 nm. Figure 2 shows the topographical features of the honeycomb pore surface after solid solution nitriding treatment.

After the honeycomb pores and the nitrided layer were formed on the stainless steel substrate, the stainless steel substrate was placed in an injection mold of a plastic material. Plastic material 2 is injection molded by plastic injection molding process On the surface of the stainless steel substrate 1, as shown in FIG. The plastic material 2 is embedded in the honeycomb pores 11 during the injection molding process to strengthen the bonding of the plastic material 2 to the stainless steel substrate 1.

After nitriding treatment, the hardness and strength of the surface layer of the stainless steel substrate are greatly improved, and the plastic material embedded in the honeycomb pores is difficult to be pulled out from the hole, thereby improving the bonding strength between the plastic and the stainless steel member. The main reason for this technical effect is that after the nitrogen atoms penetrate into the stainless steel, they are dissolved in the octahedral gap position of the austenitic face-centered cubic lattice. When a large amount of nitrogen atoms are filled into the crystal, lattice distortion will be caused, the resistance of dislocation motion will be increased, and the solid solution strengthening effect will eventually occur. In addition, the interface energy between the iron base and the nitride is smaller than the interface energy between the iron base and the carbide, so that the nitride is more likely to form a dispersed fine strengthening phase, and the second phase has a larger hindrance of dislocation motion. Better dispersion strengthening effect.

The surface of the stainless steel after chemical etching exists in thinner and loose pores, which greatly reduces the strength and hardness of the surface of the material, and has a great influence on the impact of the resin flow during the injection molding process and the later drawing test. After the surface of the stainless steel substrate is molded with plastic material, the weak honeycomb pores will be damaged to some extent. Therefore, the nitriding treatment enhances the surface strength and hardness of the stainless steel substrate, reduces the unfavorable phenomenon occurring during the injection molding and use, and has a positive influence on the injection molded part.

Taking the as-rolled 304 stainless steel as an example, the micro-Vickers hardness of the un-nitrided stainless steel is 360Hv. After nitriding treatment, the Vickers hardness of the stainless steel piece is increased by nearly 3 times, about 1200Hv. The yield strength of stainless steel without nitriding treatment is 650 MPa. After nitriding treatment, the yield strength of stainless steel parts is increased by nearly 20% to 770 MPa.

Further, after the nitriding treatment, the corrosion resistance of the stainless steel surface, the stress corrosion, and the intergranular corrosion resistance are greatly improved, the cracking caused by the later corrosion of the joint member is reduced, and the stability during use of the joint member is improved. The main reason for the technical effect is that after solid solution nitriding treatment, a nitrogen-rich passivation film is formed on the surface of the stainless steel, which inhibits the precipitation of nitride; even if a nitrogen-rich compound is formed, the intergranular corrosion effect is not lower than Cr ₂₃ C ₆ Therefore, nitriding treatment greatly reduces the sensitivity of intergranular corrosion. In addition, nitrogen has a strong resistance to pitting, and its ability far exceeds that of tens of times that of chromium.

Similarly, in the case of rolled 304 stainless steel, the polarization curve (3.5% NaCl solution, 25 ° C) junction The results show that after nitriding, the pitting potential of stainless steel increased by nearly 700mV, which is about 1200mV, and the corrosion resistance is greatly improved.

Preferably, the temperature range of the solid solution nitriding treatment is controlled at 100-1100 degrees Celsius, and the pressure of nitrogen in the solution nitriding treatment atmosphere ranges from 0.1 to 2.0 MPa. The time of solid solution nitriding treatment is 8-12h. The thickness of the nitrided layer and the nitrogen content can be adjusted by adjusting the temperature of the solid solution nitriding treatment, the nitrogen pressure, and the time. In particular, under the conditions of the above solid solution nitriding treatment, the content of solid solution nitrogen atoms in the nitrided layer can be increased.

When the solid solution nitriding treatment is carried out under the above conditions, a large amount of active nitrogen atoms [N] are formed by decomposition of nitrogen or ammonia, and adsorbed on the surface layer of the pores of stainless steel, and the presence of active atoms greatly enhances the stainless steel parts and plastics. The strength of the bond. The reason is that under the action of high temperature or arc, nitrogen or ammonia gas is easily decomposed into active nitrogen atoms [N], and solid solution penetrates into the inner layer of the stainless steel substrate. In combination with Fick's second law, the nitrogen concentration decreases with increasing distance from the surface layer. Therefore, a large amount of active nitrogen atoms [N] exist on the surface of the stainless steel after nitriding.

On the other hand, a large amount of active nitrogen atoms [N] enriched on the surface of the stainless steel substrate easily combine with H ⁺ ions in the pore-forming agent to form NH ₄ ⁺ ions ([N]+4H ⁺ +3e ^- =NH ₄ ⁺ ) It obviously increases the adsorption force of the pore-piercing agent and the stainless steel piece. In particular, a large amount of NH ₄ ⁺ ions accumulated in the pores of the stainless steel honeycomb body combine with the carboxyl groups in the PBT material to form salt and heat, and a large amount of heat directly acts on the front end of the resin flow, delaying the cooling and solidification of the resin flow, and the resin is A better filling is obtained in the pores, so that the stainless steel joints obtain better airtightness, drawing force and the like.

It is worth noting that the nitride layer formed by nitriding treatment has a thermal conductivity lower than that of the stainless steel substrate, which can reduce the heat of the plastic material from being lost from one side of the stainless steel substrate. This effect delays the time for solidification and crystallization of the plastic material, so that the plastic material can be more fully filled in the honeycomb pores, and the bottom of the honeycomb pores can also be well filled. In the case of 400 ° C, the thermal conductivity of stainless steel is 16.3 W/m·K, and the thermal conductivity of chromium nitride is 11.7 W/m·K.

Alternatively, the honeycomb pores may have an average pore diameter ranging from 10 nm to 6 μm, and the surface of the honeycomb pore stainless steel substrate may extend inwardly from an average depth ranging from 10 nm to 8 μm. The above structural features can be adjusted by controlling the pore forming process.

Alternatively, the plastic material may be made of at least one thermoplastic resin such as polyphenylene sulfide resin, polybutylene terephthalate resin, polyamide, polycarbonate, and polyolefin. These thermoplastic resins can be combined to form a high-hardness crystalline resin composition, and in the injection molding process, the composition can be crystallized and solidified in the honeycomb pores after cooling. The coefficient of linear expansion of stainless steel is 1.5×10 ^-5 /°C, while the coefficient of linear expansion of plastic materials is 6-8×10 ^-5 /°C. The coefficient of linear expansion between stainless steel and plastic materials is not conducive to the curing of plastic materials. process. Therefore, the plastic material can be modified to reduce the coefficient of linear expansion of the plastic material. The plastic material may include a thermoplastic resin and a filler. The mass percentage of the filler material in the plastic material is 5-40%. The filler material includes at least one of nylon fiber, carbon fiber, glass fiber, aramid fiber, calcium carbonate, magnesium carbonate, silica, and clay. Taking a glass fiber material as an example, the linear expansion coefficient is only 3.8×10 ^-5 /°C, and a material such as glass fiber can be blended in the thermoplastic resin so that the linear expansion coefficient of the plastic material composition is as close as possible to the stainless steel.

The invention also provides a method for processing a joint of stainless steel and plastic. Firstly, a stainless steel substrate is provided, and the stainless steel substrate is subjected to a hole forming process to form a honeycomb fine hole on the surface of the stainless steel substrate; The stainless steel substrate is subjected to solid solution nitriding treatment to form a nitrided layer on the surface of the stainless steel substrate, and nitrogen atoms permeate from the surface layer of the stainless steel substrate to the inside. The thickness of the nitrided layer is greater than 10 nm. Finally, a plastic material is injection molded on the surface of the stainless steel substrate, and a partial structure of the plastic material is embedded in the honeycomb pores to form an integrated joint of stainless steel and plastic. The joint of stainless steel and plastic provided by the present invention can be prepared by the processing method provided by the present invention.

The specific solid solution nitriding process may be: placing the stainless steel substrate in a solid solution nitriding treatment device as soon as possible after the pore forming treatment of the stainless steel substrate; the temperature of the solid solution nitriding treatment is in the range of 100-1100 degrees Celsius. The pressure of nitrogen in the atmosphere is 0.1-2.0 MPa, and the time of solid solution nitriding treatment can be determined according to specific performance requirements; after the solid solution nitriding treatment is completed, the stainless steel substrate is cooled.

The nitrided layer includes a solid solution nitrogen atom that does not react with the stainless steel substrate to produce a compound. Preferably, the content of the solid solution nitrogen atom can be increased by the adjustment of the following solid solution nitriding treatment conditions. The temperature range of solid solution nitriding treatment is limited to 100-1100 degrees Celsius, the pressure range of nitrogen is 0.5-1.5 MPa, and the time of solid solution nitriding treatment is 8-12 hours.

In particular, in consideration of actual production processing, the pore forming treatment and the solid solution nitriding treatment may not be closely connected due to factors such as equipment efficiency. A stainless steel substrate that has been subjected to a hole-forming process may take a while to perform a solution nitriding treatment. During the waiting period, it is possible to form an oxide film and a passivation film again on the stainless steel substrate, and these film layers may affect the infiltration of nitrogen atoms during the solid solution nitriding treatment. Therefore, optionally, the stainless steel substrate which has been subjected to the pore forming treatment may be washed in a dilute hydrochloric acid having a volume fraction of 10 to 30% before the nitriding treatment. The oxide film and the passivation film are removed to improve the conditions of nitrogen atom permeation, and the barrier effect of the film layer on the diffusion of nitriding atoms is excluded. The cleaning step should not be too long, otherwise the honeycomb pores will be further corroded.

Preferably, after the solution nitriding treatment is completed, the stainless steel substrate can be placed in a protective gas for rapid cooling to obtain more solid solution nitrogen atoms. The use of a non-oxidizing atmosphere avoids oxidation of higher temperature stainless steel parts in the atmosphere or in an oxygen environment, affecting the activity of the nitrogen atoms enriched in the surface layer. Stainless steel parts tend to form a stable phase of nitride with chromium or iron at a slower cooling rate, thereby reducing the reactive nitrogen content of the surface of the stainless steel. Therefore, the cooling rate of the stainless steel can be accelerated to keep more nitrogen atoms active.

Alternatively, the stainless steel substrate may be subjected to a boring treatment after the nitriding treatment is completed. The cooled stainless steel substrate is placed in a pore-piercing agent, and after being soaked for a period of time, it is taken out and naturally dried, and can also be washed and dried. The reaming treatment can improve the characteristics of the surface of the stainless steel part and form more ammonium ions, so that the plastic material can be better filled into the honeycomb pores in the subsequent injection molding process, and the plastic material is solidified and embedded in the honeycomb shape. The shape in the pores.

The pore-expanding agent comprises at least one of terephthalic acid, ethylenediaminetetraacetic acid, p-nitrobenzenesulfonic acid, water-soluble amino acid, ethylenediamine, triethanolamine, aqueous ammonia, ethyl chloride, and epichlorohydrin. After the stainless steel substrate is taken out from the pore-running agent, the pore-penetrating agent uniformly attached to the oxide layer can physically and chemically react with the plastic material in the injection molding process, so that the plastic material accelerates into the honeycomb-like pores, and the plastic is remarkably improved. The combination with stainless steel parts.

The hole forming treatment of the stainless steel substrate may be chemical etching or electrochemical etching. The present invention does not limit this, and a specific etching treatment may be selected according to the structure and performance requirements of the honeycomb pores.

For chemical etching, the stainless steel substrate can be placed in a chemical etching solution at 30-90 degrees Celsius. The medium is immersed for 10 to 120 minutes, and the chemical etching solution includes at least one of sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid, boric acid, formic acid, propionic acid, butyric acid, alginic acid, oxalic acid, citric acid, and caprolactam. Alternatively, the entire etching process to form a hole may include a plurality of different chemical etching steps to control the pore-forming effect of the pore size, distribution, and the like of the honeycomb pores.

For electrochemical etching, the stainless steel substrate can be used as an anode to electrochemically etch a region where the honeycomb pores are to be formed, and the electrochemical etching voltage ranges from 5 to 60 V for a duration of 10 to 100 minutes.

In particular, it is also possible to employ chemical etching and electrochemical etching, respectively, in different steps of the entire etching process. This etching method can obtain richer pore-forming control effects. For example, chemical etching can be used to form pores with larger pore diameters, and then electrochemical etching etching is used to form honeycomb pores having smaller pore diameters.

The present invention actually provides a stainless steel sheet prepared by the above method. Specifically, after the temperature is 100-1100 degrees Celsius, nitrogen pressure 0.5-1 MPa solid solution nitriding treatment for 6 hours, after rapid cooling in a protective gas, the percentage of nitrogen content in the nitrided layer of the sample is analyzed by XPS results. 0.9%, the concentration of the internal extension gradually decreased, and the thickness of the nitrided layer was about 50 nm. The surface modified stainless steel member is then embedded in an injection molding die to obtain a final composite bond. A plastic material mixed with PBT + 30 wt% glass fiber was injected at an injection temperature of 300 ° C, and finally injection-molded to obtain a joint of stainless steel and plastic. Figure 3 is a schematic illustration of a joint of stainless steel and plastic in a tensile test of the present invention. Among them, the plastic material 2 is embedded in the honeycomb pores 11, and the contact area of the plastic material 2 with the stainless steel substrate 1 is 0.5 cm ² , and the tensile strength is drawn on a tensile tester to obtain an average shear breaking force of 31.2 MPa.

While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A joint of stainless steel and plastic, characterized in that the joint comprises a stainless steel substrate, the surface of the stainless steel substrate is formed with honeycomb pores, and the surface layer of the stainless steel substrate is treated by solid solution nitriding A nitrided layer is formed, the nitrided layer having a thickness greater than 10 nm, and the stainless steel substrate is injection molded with a plastic material embedded in the honeycomb pores.
The combination of stainless steel and plastic according to claim 1, wherein said solid solution nitriding treatment has a temperature in the range of 100 to 1100 degrees Celsius, and the nitriding atmosphere comprises at least one of nitrogen gas and ammonia gas.
A combination of stainless steel and plastic according to claim 1 or 2, wherein the nitrided layer has a thickness in the range of 10 to 1000 nm.
The combination of stainless steel and plastic according to any one of claims 1 to 3, wherein the honeycomb pores have an average pore diameter ranging from 10 nm to 6 μm, and the honeycomb pores are from the surface of the stainless steel substrate. The average depth extending into the interior ranges from 10 nm to 8 μm.
A combination of stainless steel and plastic according to any one of claims 1 to 4, wherein said plastic material comprises a thermoplastic resin and a filler material, and said filler material has a mass percentage of 5-40 in said plastic material. %, the filler material comprises at least one of nylon fiber, carbon fiber, glass fiber, aramid fiber, calcium carbonate, magnesium carbonate, silica, and clay.
A combination of stainless steel and plastic according to any one of claims 1 to 5, wherein said thermoplastic resin comprises at least polyphenylene sulfide resin, polybutylene terephthalate resin, polyamide, polycarbonate, and At least one of the polyolefins.
A method for processing a joint of stainless steel and plastic, characterized in that a stainless steel substrate is provided; a honeycomb pore is formed on a surface of the stainless steel substrate; and the stainless steel substrate is subjected to solid solution nitriding treatment in the stainless steel Forming a nitriding layer on the surface of the substrate, the nitriding layer having a thickness greater than 10 nm, molding a plastic material on the surface of the stainless steel substrate, and embedding a partial structure of the plastic material in the honeycomb pores to form stainless steel and Integrated joint of plastic.
The method of processing a joint according to claim 7, wherein the nitriding treatment has a temperature in the range of 100 to 1100 degrees Celsius, and the nitriding atmosphere includes at least one of nitrogen gas and ammonia gas.
The method of processing a bonding member according to claim 7 or 8, wherein the stainless steel substrate is placed in an acidic solution having a volume fraction of 10 to 30% before the solution nitriding treatment.
The method of processing a joint according to any one of claims 7-9, characterized in that after the solid solution nitriding treatment is completed, the stainless steel substrate is placed in a protective atmosphere for rapid cooling.
The method for processing a joint according to any one of claims 7 to 10, characterized in that after the solution nitriding treatment, the stainless steel substrate is subjected to a boring treatment, and the stainless steel substrate is immersed in the boring agent, after which Take out and dry, the pore-treating agent includes: terephthalic acid, ethylenediaminetetraacetic acid, p-nitrobenzenesulfonic acid, water-soluble amino acid, ethylenediamine, triethanolamine, ammonia, ethyl chloride, epichlorohydrin At least one of them.
The method for processing a bonding member according to any one of claims 7-11, wherein a honeycomb-shaped pore is formed on the stainless steel substrate by chemical etching, and the stainless steel substrate is placed in a chemical etching solution of 30-90 degrees Celsius. Immersion for 10 to 120 minutes, the chemical etching solution comprising: at least one of sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid, boric acid, formic acid, propionic acid, butyric acid, alginic acid, oxalic acid, citric acid, and caprolactam.
The method for processing a bonding material according to any one of claims 7 to 12, wherein a honeycomb-shaped pore is formed on the stainless steel substrate by electrochemical etching, and a stainless steel substrate is used as an anode to make a region of the plastic material to be injection-molded. Electrochemical etching occurs, and the electrochemical etching has a voltage range of 5-60 V and a duration of 10-100 minutes.