CN107326405A - A kind of electroplating surface processing technology of car belt buckle - Google Patents
A kind of electroplating surface processing technology of car belt buckle Download PDFInfo
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- CN107326405A CN107326405A CN201710484252.XA CN201710484252A CN107326405A CN 107326405 A CN107326405 A CN 107326405A CN 201710484252 A CN201710484252 A CN 201710484252A CN 107326405 A CN107326405 A CN 107326405A
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- Prior art keywords
- nickel plating
- plating treatment
- belt buckle
- processing technology
- surface processing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
Abstract
The invention discloses a kind of electroplating surface processing technology of car belt buckle, comprise the following steps：（1）Buckle cleaning treatment,（2）Surface activation process,（3）Electroplate Nickel Plating Treatment.The present invention has carried out rational adjustment to safety belt buckle electroplating surface handling process and improved, finally a kind of special composite deposite is deposited in its electroplating surface, the characteristics such as the corrosion resistant of safety belt buckle, wear-resisting, impact resistance are enhanced well, and comprehensive good using characteristic, promotional value is high.
Description
Technical field
The invention belongs to auto parts and components processing technique field, and in particular to a kind of electroplating surface of car belt buckle
Processing technology.
Background technology
With the lifting of living standard, city vehicle number is also constantly increasing therewith, and the restraint system in vehicle is
Essential part, it for occupant on car can provide strong protection when accident occurs for vehicle.Car belt system
Safety belt band body, safety belt buckle, safety belt lock catch can be reduced to, wherein safety belt buckle, which is worn, is fixed on safety belt band body
On, and can plug together and be locked in safety belt lock catch, so as to define the position of occupant, protect its safety.Outside safety belt buckle
Shape is generally sheet, and section is in convex, and material is generally steel, and is plugged because of safety belt buckle and air contact, and often
Action, it is therefore desirable to handle its surface, to strengthen the characteristic such as its corrosion resistant, wear-resisting, and then extend the use longevity of this part
Life.The existing processing method for steel surface is more, and plating nickel plating is then one of which, and it can effectively improve steel surface
Character, but the continuous lifting required with people properties of product, existing nickel-plating technology can not be met, it is necessary to it well
Updated.
The content of the invention
The purpose of the present invention is to process work there is provided a kind of electroplating surface of car belt buckle the problem of being directed to existing
Skill.
The present invention is achieved by the following technical solutions：
A kind of electroplating surface processing technology of car belt buckle, comprises the following steps：
（1）Buckle cleaning treatment：
Grinding process first is carried out to snap surface to be processed with sand paper, after the completion of the chip on surface is blown away with compressed air, so
It is dipped in acetone soln progress surface degreasing processing again afterwards, finally takes out with standby after deionized water rinsing one time；
（2）Surface activation process：
By step（1）Buckle after processing is put into the hydrochloric acid solution that mass fraction is 5 ~ 7% after 2 ~ 3min of immersion activation process
Take out, then with standby after deionized water rinsing one time；
（3）Electroplate Nickel Plating Treatment：
By step（2）Buckle after processing is immersed in progress plating nickel on surface processing in Nickel Plating Treatment liquid, controls average current density
For 2.5 ~ 3A/dm2, buckle is taken out after 11 ~ 13min of electroplating processes；Each composition and its right in described Nickel Plating Treatment liquid
The content is answered to be：280 ~ 300g/L of nickel sulfate, 60 ~ 65g/L of nickel chloride, 18 ~ 23g/L of boric acid, 10 ~ 15g/L of citric acid, cetyl
0.1 ~ 0.4g/L of benzene sulfonic acid sodium salt, 40 ~ 50g/L of composite nanometer particle, surplus is water；Described composite nanometer particle is by nanometer stone
Ink powder and nano titanium oxide are made.
Further, step（1）Described in sand paper grinding process be first to be polished one time with 100 mesh sand paper, then use 220 mesh
Sand paper is polished one time, is finally polished one time with 400 mesh sand paper.
Further, step（2）Described in immersion activation process when heating keep hydrochloric acid solution temperature be 32 ~ 35
℃。
Further, step（3）Described in Nickel Plating Treatment when apply is pulse current.
Further, step（3）Described in Nickel Plating Treatment liquid pH value control be 4.0 ~ 4.5.
Further, step（3）Described in Nickel Plating Treatment when also apply ultrasonication, the application frequency of ultrasonic wave is
58~60kHz。
Further, step（3）Described in Nickel Plating Treatment when heating keep Nickel Plating Treatment liquid temperature be 40 ~ 45 DEG C.
Further, step（3）Described in the preparation method of composite nanometer particle comprise the following steps：
（1）Choose particle diameter size standby for 1 ~ 10 μm of Nano graphite powder；
（2）By step（1）The Nano graphite powder of selection is immersed in solution A, and heating keeps the temperature of solution A to be 60 ~ 65 DEG C, with
500 ~ 600 revs/min of rotating speed be stirred continuously after 40 ~ 50min of processing mixed liquid B is standby；Each composition and its right in the solution A
The percentage by weight is answered to be：Titanate coupling agent 3 ~ 5%, potassium permanganate 0.1 ~ 0.2%, acrylic acid 2 ~ 4%, disodium ethylene diamine tetraacetate
0.3 ~ 0.6%, surplus is water；
（3）Particle diameter size is added to step for 15 ~ 60nm titanium dioxide nanoparticle（2）In the mixed liquid B of gained,
Its amount added is the 27 ~ 32% of Nano graphite powder gross mass, and the heating of the temperature of mixed liquid B now risen into 77 ~ 82 DEG C, then with
800 ~ 900 revs/min of rotating speed is stirred continuously 1 ~ 1.5h of processing, finally carries out filtration drying.
Existing plating nickel plating technology is constantly to be deposited nickle atom in workpiece surface, ultimately forms nickel coating,
So that to improve the surface characteristic of workpiece, and found to finished product Micro-Structure Analysis, the compactness deposited inside coating is still not
It is too high, and there is certain microcrack, hole phenomenon, while the composition of coating is more single, cause wear and shock-resistant performance not
By force, carried out rational adjustment to the technique of processing to this present invention to improve, wherein when electroplating Nickel Plating Treatment, being applied with higher
The pulse current of current density, pulse current is more conducive to nickel layer deposition compared with Traditional DC electric current so that crystallization is finer and close, in arteries and veins
Workpiece surface deposited substantial amounts of tiny nucleus during punching conducting, and nucleus just stops growing during pulse-off, and next pulse is led
New nucleus can be deposited again again when logical, and this mode can effectively ensure the deposition of more more tiny nucleus, so as to improve plating
The performances such as the compactness of layer, and in order to further lift the characteristic of coating, and with the addition of composite Nano in Nickel Plating Treatment liquid
Grain, wherein composite nanometer particle is the composite particles that a kind of nano titanium oxide wraps Nano graphite powder, after pulse-off this
Composite nanometer particle just adsorbs the surface for being deposited on nickel coating nucleus, after continuous electroplating processes, this composite nanometer particle with
Nickel crystallite forms the composite deposite that a kind of interbed is combined, and combination property is further lifted.
The present invention has advantages below compared with prior art：
The present invention has carried out rational adjustment to safety belt buckle electroplating surface handling process and improved, finally heavy in its electroplating surface
A kind of special composite deposite has been accumulated, the characteristics such as the corrosion resistant of safety belt buckle, wear-resisting, impact resistance are enhanced well, synthesis makes
Good with characteristic, promotional value is high.
Embodiment
Embodiment 1
A kind of electroplating surface processing technology of car belt buckle, comprises the following steps：
（1）Buckle cleaning treatment：
Grinding process first is carried out to snap surface to be processed with sand paper, after the completion of the chip on surface is blown away with compressed air, so
It is dipped in acetone soln progress surface degreasing processing again afterwards, finally takes out with standby after deionized water rinsing one time；
（2）Surface activation process：
By step（1）Buckle after processing is put into the hydrochloric acid solution that mass fraction is 5% and taken after immersion activation process 2min
Go out, then with standby after deionized water rinsing one time；
（3）Electroplate Nickel Plating Treatment：
By step（2）Buckle after processing is immersed in progress plating nickel on surface processing in Nickel Plating Treatment liquid, controls average current density
For 2.5A/dm2, buckle is taken out after electroplating processes 11min；Each composition and its correspondence content in described Nickel Plating Treatment liquid
For：It is nickel sulfate 280g/L, nickel chloride 60g/L, boric acid 18g/L, citric acid 10g/L, cetyl benzenesulfonic acid sodium 0.1g/L, compound
Nano particle 40g/L, surplus is water；Described composite nanometer particle is made up of Nano graphite powder and nano titanium oxide.
Further, step（1）Described in sand paper grinding process be first to be polished one time with 100 mesh sand paper, then use 220 mesh
Sand paper is polished one time, is finally polished one time with 400 mesh sand paper.
Further, step（2）Described in immersion activation process when heating keep hydrochloric acid solution temperature be 32 DEG C.
Further, step（3）Described in Nickel Plating Treatment when apply is pulse current.
Further, step（3）Described in Nickel Plating Treatment liquid pH value control be 4.0 ~ 4.1.
Further, step（3）Described in Nickel Plating Treatment when also apply ultrasonication, the application frequency of ultrasonic wave is
58kHz。
Further, step（3）Described in Nickel Plating Treatment when heating keep Nickel Plating Treatment liquid temperature be 40 DEG C.
Further, step（3）Described in the preparation method of composite nanometer particle comprise the following steps：
（1）Choose particle diameter size standby for 1 ~ 10 μm of Nano graphite powder；
（2）By step（1）The Nano graphite powder of selection is immersed in solution A, and heating keeps the temperature of solution A to be 60 DEG C, with 500
Rev/min rotating speed be stirred continuously processing 40min after mixed liquid B it is standby；Each composition and its correspondence weight percent in the solution A
Than for：Titanate coupling agent 3%, potassium permanganate 0.1%, acrylic acid 2%, disodium ethylene diamine tetraacetate 0.3%, surplus is water；
（3）Particle diameter size is added to step for 15 ~ 60nm titanium dioxide nanoparticle（2）In the mixed liquid B of gained,
Its amount added is the 27% of Nano graphite powder gross mass, and the heating of the temperature of mixed liquid B now risen into 77 DEG C, then with 800 turns/
The rotating speed divided is stirred continuously processing 1h, finally carries out filtration drying.
Embodiment 2
A kind of electroplating surface processing technology of car belt buckle, comprises the following steps：
（1）Buckle cleaning treatment：
Grinding process first is carried out to snap surface to be processed with sand paper, after the completion of the chip on surface is blown away with compressed air, so
It is dipped in acetone soln progress surface degreasing processing again afterwards, finally takes out with standby after deionized water rinsing one time；
（2）Surface activation process：
By step（1）Buckle after processing is put into the hydrochloric acid solution that mass fraction is 6% and taken after immersion activation process 2.5min
Go out, then with standby after deionized water rinsing one time；
（3）Electroplate Nickel Plating Treatment：
By step（2）Buckle after processing is immersed in progress plating nickel on surface processing in Nickel Plating Treatment liquid, controls average current density
For 2.8A/dm2, buckle is taken out after electroplating processes 12min；Each composition and its correspondence content in described Nickel Plating Treatment liquid
For：It is nickel sulfate 290g/L, nickel chloride 62g/L, boric acid 20g/L, citric acid 13g/L, cetyl benzenesulfonic acid sodium 0.3g/L, compound
Nano particle 45g/L, surplus is water；Described composite nanometer particle is made up of Nano graphite powder and nano titanium oxide.
Further, step（1）Described in sand paper grinding process be first to be polished one time with 100 mesh sand paper, then use 220 mesh
Sand paper is polished one time, is finally polished one time with 400 mesh sand paper.
Further, step（2）Described in immersion activation process when heating keep hydrochloric acid solution temperature be 34 DEG C.
Further, step（3）Described in Nickel Plating Treatment when apply is pulse current.
Further, step（3）Described in Nickel Plating Treatment liquid pH value control be 4.1 ~ 4.3.
Further, step（3）Described in Nickel Plating Treatment when also apply ultrasonication, the application frequency of ultrasonic wave is
59kHz。
Further, step（3）Described in Nickel Plating Treatment when heating keep Nickel Plating Treatment liquid temperature be 42 DEG C.
Further, step（3）Described in the preparation method of composite nanometer particle comprise the following steps：
（1）Choose particle diameter size standby for 1 ~ 10 μm of Nano graphite powder；
（2）By step（1）The Nano graphite powder of selection is immersed in solution A, and heating keeps the temperature of solution A to be 62 DEG C, with 550
Rev/min rotating speed be stirred continuously processing 45min after mixed liquid B it is standby；Each composition and its correspondence weight percent in the solution A
Than for：Titanate coupling agent 4%, potassium permanganate 0.15%, acrylic acid 3%, disodium ethylene diamine tetraacetate 0.5%, surplus is water；
（3）Particle diameter size is added to step for 15 ~ 60nm titanium dioxide nanoparticle（2）In the mixed liquid B of gained,
Its amount added is the 30% of Nano graphite powder gross mass, and the heating of the temperature of mixed liquid B now risen into 80 DEG C, then with 850 turns/
The rotating speed divided is stirred continuously processing 1.2h, finally carries out filtration drying.
Embodiment 3
A kind of electroplating surface processing technology of car belt buckle, comprises the following steps：
（1）Buckle cleaning treatment：
Grinding process first is carried out to snap surface to be processed with sand paper, after the completion of the chip on surface is blown away with compressed air, so
It is dipped in acetone soln progress surface degreasing processing again afterwards, finally takes out with standby after deionized water rinsing one time；
（2）Surface activation process：
By step（1）Buckle after processing is put into the hydrochloric acid solution that mass fraction is 7% and taken after immersion activation process 3min
Go out, then with standby after deionized water rinsing one time；
（3）Electroplate Nickel Plating Treatment：
By step（2）Buckle after processing is immersed in progress plating nickel on surface processing in Nickel Plating Treatment liquid, controls average current density
For 3A/dm2, buckle is taken out after electroplating processes 13min；Each composition and its correspondence content in described Nickel Plating Treatment liquid
For：It is nickel sulfate 300g/L, nickel chloride 65g/L, boric acid 23g/L, citric acid 15g/L, cetyl benzenesulfonic acid sodium 0.4g/L, compound
Nano particle 50g/L, surplus is water；Described composite nanometer particle is made up of Nano graphite powder and nano titanium oxide.
Further, step（1）Described in sand paper grinding process be first to be polished one time with 100 mesh sand paper, then use 220 mesh
Sand paper is polished one time, is finally polished one time with 400 mesh sand paper.
Further, step（2）Described in immersion activation process when heating keep hydrochloric acid solution temperature be 35 DEG C.
Further, step（3）Described in Nickel Plating Treatment when apply is pulse current.
Further, step（3）Described in Nickel Plating Treatment liquid pH value control be 4.4 ~ 4.5.
Further, step（3）Described in Nickel Plating Treatment when also apply ultrasonication, the application frequency of ultrasonic wave is
60kHz。
Further, step（3）Described in Nickel Plating Treatment when heating keep Nickel Plating Treatment liquid temperature be 45 DEG C.
Further, step（3）Described in the preparation method of composite nanometer particle comprise the following steps：
（1）Choose particle diameter size standby for 1 ~ 10 μm of Nano graphite powder；
（2）By step（1）The Nano graphite powder of selection is immersed in solution A, and heating keeps the temperature of solution A to be 65 DEG C, with 600
Rev/min rotating speed be stirred continuously processing 50min after mixed liquid B it is standby；Each composition and its correspondence weight percent in the solution A
Than for：Titanate coupling agent 5%, potassium permanganate 0.2%, acrylic acid 4%, disodium ethylene diamine tetraacetate 0.6%, surplus is water；
（3）Particle diameter size is added to step for 15 ~ 60nm titanium dioxide nanoparticle（2）In the mixed liquid B of gained,
Its amount added is the 32% of Nano graphite powder gross mass, and the heating of the temperature of mixed liquid B now risen into 82 DEG C, then with 900 turns/
The rotating speed divided is stirred continuously processing 1.5h, finally carries out filtration drying.
Comparative example 1
This comparative example 1 compared with Example 2, in step（3）When electroplating Nickel Plating Treatment, without matching somebody with somebody for composite nanometer particle
System operation, i.e., be directly added to Nickel Plating Treatment by Nano graphite powder and titanium dioxide nanoparticle by corresponding mass ratio and addition
In liquid, method and step all same in addition.
Comparative example 2
This comparative example 2 compared with Example 2, in step（3）Electroplate Nickel Plating Treatment when, with etc. mass parts commercially available nanometer stone
Ink powder（Particle diameter size is 1 ~ 10 μm）Replace composite nanometer particle, method and step all same in addition.
Comparative example 3
This comparative example 3 compared with Example 2, in step（3）Electroplate Nickel Plating Treatment when, with etc. mass parts commercially available nanometer two
Titan oxide particles（Particle diameter size is 15 ~ 60nm）Replace composite nanometer particle, method and step all same in addition.
Comparative example 4
This comparative example 4 compared with Example 2, in step（3）When electroplating Nickel Plating Treatment, save compound in Nickel Plating Treatment liquid
Nanoparticulate composition, method and step all same in addition.
In order to contrast effect of the present invention, the safety belt buckle being made from same batch（It is made up of No. 45 steel）It is used as experiment pair
As respectively with the side described in above-described embodiment 2, comparative example 1, comparative example 2, comparative example 3, comparative example 4
Method is processed, after the completion of performance test is carried out to finished product, specific correction data is as shown in table 1 below：
Table 1
| Neutral salt spray test etching time（h） | Case hardness（kg/mm2） | |
| Embodiment 2 | 12 | 680 |
| Comparative example 1 | 9.0 | 625 |
| Comparative example 2 | 8.0 | 604 |
| Comparative example 3 | 5.0 | 583 |
| Comparative example 4 | 4.5 | 570 |
Note：The corresponding experimental method of neutral salt spray test etching time described in upper table 1 is：With reference to GB 10125-1997, adopt
With the NaCl solution that mass fraction is 5%, pH value is 6.8, and experimental box temperature is（35±2）DEG C, saturated air barrel temperature is 47
DEG C, the test surfaces of sample are with a vertical 30 °, and superficial film other each faces in addition to test surfaces are sealed with 504 glue to be protected, continuously
Spraying, occurs the time of hot spot, foaming or peeling according to film layer to evaluate the corrosion resistance of overlay coating.
Handling process of the present invention can effectively strengthen the use characteristic of coating it can be seen from upper table 1, and then improve peace
The full use quality with buckle, high treating effect, promotional value is high.
Claims (8)
1. a kind of electroplating surface processing technology of car belt buckle, it is characterised in that comprise the following steps：
（1）Buckle cleaning treatment：
Grinding process first is carried out to snap surface to be processed with sand paper, after the completion of the chip on surface is blown away with compressed air, so
It is dipped in acetone soln progress surface degreasing processing again afterwards, finally takes out with standby after deionized water rinsing one time；
（2）Surface activation process：
By step（1）Buckle after processing is put into the hydrochloric acid solution that mass fraction is 5 ~ 7% after 2 ~ 3min of immersion activation process
Take out, then with standby after deionized water rinsing one time；
（3）Electroplate Nickel Plating Treatment：
By step（2）Buckle after processing is immersed in progress plating nickel on surface processing in Nickel Plating Treatment liquid, controls average current density
For 2.5 ~ 3A/dm2, buckle is taken out after 11 ~ 13min of electroplating processes；Each composition and its right in described Nickel Plating Treatment liquid
The content is answered to be：280 ~ 300g/L of nickel sulfate, 60 ~ 65g/L of nickel chloride, 18 ~ 23g/L of boric acid, 10 ~ 15g/L of citric acid, cetyl
0.1 ~ 0.4g/L of benzene sulfonic acid sodium salt, 40 ~ 50g/L of composite nanometer particle, surplus is water；Described composite nanometer particle is by nanometer stone
Ink powder and nano titanium oxide are made.
2. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（1）Described in sand paper grinding process be first with 100 mesh sand paper polish one time, then with 220 mesh sand paper polishing one time, finally use
400 mesh sand paper are polished one time.
3. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（2）Described in immersion activation process when heating keep hydrochloric acid solution temperature be 32 ~ 35 DEG C.
4. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（3）Described in Nickel Plating Treatment when apply is pulse current.
5. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（3）Described in Nickel Plating Treatment liquid pH value control be 4.0 ~ 4.5.
6. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（3）Described in Nickel Plating Treatment when also apply ultrasonication, the application frequency of ultrasonic wave is 58 ~ 60kHz.
7. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（3）Described in Nickel Plating Treatment when heating keep Nickel Plating Treatment liquid temperature be 40 ~ 45 DEG C.
8. a kind of electroplating surface processing technology of car belt buckle according to claim 1, it is characterised in that step
（3）Described in the preparation method of composite nanometer particle comprise the following steps：
（1）Choose particle diameter size standby for 1 ~ 10 μm of Nano graphite powder；
（2）By step（1）The Nano graphite powder of selection is immersed in solution A, and heating keeps the temperature of solution A to be 60 ~ 65 DEG C, with
500 ~ 600 revs/min of rotating speed be stirred continuously after 40 ~ 50min of processing mixed liquid B is standby；Each composition and its right in the solution A
The percentage by weight is answered to be：Titanate coupling agent 3 ~ 5%, potassium permanganate 0.1 ~ 0.2%, acrylic acid 2 ~ 4%, disodium ethylene diamine tetraacetate
0.3 ~ 0.6%, surplus is water；
（3）Particle diameter size is added to step for 15 ~ 60nm titanium dioxide nanoparticle（2）In the mixed liquid B of gained,
Its amount added is the 27 ~ 32% of Nano graphite powder gross mass, and the heating of the temperature of mixed liquid B now risen into 77 ~ 82 DEG C, then with
800 ~ 900 revs/min of rotating speed is stirred continuously 1 ~ 1.5h of processing, finally carries out filtration drying.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023453A (en) * | 2018-08-23 | 2018-12-18 | 安徽江杰实业有限公司 | A kind of processing method promoting stainless steel tube antiseptic property |
| CN110396710A (en) * | 2019-08-08 | 2019-11-01 | 温州中牙模具有限公司 | A kind of wear-resisting screw plate and its production technology |
| CN113215631A (en) * | 2021-05-08 | 2021-08-06 | 遵义智通金属表面技术处理有限公司 | Inner hole deposition technology for fine micropores with large depth-diameter ratio |
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