CN103225098A - Preparation method of nickel-polytetrafluoroethylene coating - Google Patents
Preparation method of nickel-polytetrafluoroethylene coating Download PDFInfo
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- CN103225098A CN103225098A CN2013102030098A CN201310203009A CN103225098A CN 103225098 A CN103225098 A CN 103225098A CN 2013102030098 A CN2013102030098 A CN 2013102030098A CN 201310203009 A CN201310203009 A CN 201310203009A CN 103225098 A CN103225098 A CN 103225098A
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Abstract
The invention relates to the technical field of electroplating, and particularly relates to a preparation method of a nickel-polytetrafluoroethylene coating. According to the invention, nickel is combined with polytetrafluoroethylene, a fluorinated ethylene-propylene copolymer, a perfluoroalkoxy copolymer and other assistants to be used as an electroplating solution and used for electroplating under certain conditions. The invention can be widely applied to various base materials such as steel, copper alloys, wrought aluminum, cast iron, stainless steel and the like, and can be also perfectly used on various injection molding materials except pure rubber, such as silica gel, TPO0, PVC (polyvinyl chloride) and the like. The coating is favorable in wear resistance and non-corrosibility, has weldability and hardenability, and causes no negative effect on the surfaces of other molds.
Description
Technical field
The present invention relates to the electroplating technology field, particularly relate to a kind of preparation method of nickel-polytetrafluorethylecoatings coatings.
Background technology
Electroplating (Electroplating) utilizes electrolysis principle to plate the process of other metal or alloy of skim on some metallic surface.During plating, coated metal is done anode, is oxidized to positively charged ion and enters electroplate liquid; Metal products to be plated is done negative electrode, and the positively charged ion of coated metal is reduced formation coating in the metallic surface.For getting rid of other cationic interference, and make coating evenly, firmly, need cook electroplate liquid, to keep the cationic concentration of coated metal constant with containing the cationic solution of coated metal.
Galvanized purpose is to plate metal plating (deposit) on base material, changes substrate surface character or size.Plating can strengthen metal erosion resistance (coated metal adopts corrosion resistant metal more), increase hardness, prevent abrasion, improve electroconductibility, oilness, thermotolerance and surface aesthetic.
Utilize electrolytic action on machinework, to deposit to adhere to the technology good but metal cover that performance is different with body material.Electrolytic coating than hot dipping layer evenly, generally all thinner, do not wait to tens microns from several micron.
By electroplating, can on machinework, obtain to decorate protectiveness and various functional upper layer, can also repair the workpiece of wearing and tearing and processing error.Coating is single metal or alloy mostly, as zinc, cadmium, gold or brass, bronze etc.; The disperse layer is also arranged, as nickel-silicon carbide, nickel-fluorographite etc.; Be laminated with layer in addition, as the silver on the copper-nickel on the steel-chromium layer, the steel-indium layer etc.Galvanized body material also has non-ferrous metal except that cast iron, steel and the stainless steel of iron-based, as ABS plastic, polypropylene, polysulfones and phenoplast, but before the plastic electroplating, must handle through special activation and sensitization.
In order to pursue decorative effect and the strong functions that better plating brings, people have carried out a lot of researchs to electroplating from the configuration of method and electroplate liquid; But at present, existing technology is perfect not enough aspect finished product wear resistance, hardness, preservative property and production efficiency, and use range is narrower, can only singlely be used in respectively that metal is wanted or nonmetal on.
Mould product often adopts process for modifying surface to improve the mechanical property and the work-ing life of mould now.The process for treating surface of mould mainly contains anodic oxidation, hard anodizing and application rete.Mould is carried out anodic oxidation, though form layer oxide film on the surface, this oxide film can improve the mechanical property of mould to a certain extent, but prepared oxidation film layer is thinner, less with the bonding force of matrix, surface hardness can only be in a short period of time to its provide protection of mould generally about 300HV; And the oxidation film layer of hard anodizing preparation improves than the hardness of common anode oxidation film layer, can reach 450HV, but its processing requirement is very strict, and the temperature of general electrolytic solution must be controlled at below 5 ℃.The mould product field of surface coatings, extensively adopt multi-arc ion plating equipment and technology, hallow cathode deposition, HCD equipment and technology etc. both at home and abroad, preparation TiN, AIN, CrN, TiC, coatings such as TiCN, TiAIN, because its oxidation resistance temperature is low, frictional force is big, with reasons such as basal body binding force is little, application is restricted.
Summary of the invention
In order to address the above problem, the objective of the invention is to, a kind of preparation method of nickel-polytetrafluorethylecoatings coatings is provided; The plating piece that uses this method to handle to obtain not only wear resistance, preservative property is good, and has and can weld and hardenability, other die surface is not produced any negative impact.
The present invention is achieved through the following technical solutions:
A kind of preparation method of nickel-polytetrafluorethylecoatings coatings may further comprise the steps:
A. pre-treatment
Unplated piece is gone up extension, degreasing degreasing, washing, acid-wash activation successively;
B. electroplate
Configuration electroplate liquid: comprise staple fiber 1%～3%, nickelous chloride 20%～30%, Trisodium Citrate 5%～8%, single nickel salt 22%～30%, polytetrafluoroethylene granule 7%～20%, ethylene fluoride 1%～5%, mistake fluoroalkylation thing 1%～5%, propylene copolymer 1%～5%, octyl phenyl polyoxyethylene fan 0.1%～0.3% and the ammoniacal liquor of will count by weight percentage;
Again with unplated piece as negative electrode, the nickel plate as anode, is put into above-mentioned plating bath and is electroplated for some time, on plating piece, form one deck coating;
C. aftertreatment
Good unplated piece water cleans, the universe is dry with electroplating, hang the finished product that obtains being electroplate with nickel-polytetrafluorethylecoatings coatings down.
Preferably, before the described upward extension, polish and polished finish.
Preferably, carry out electropolishing or chemical rightenning after the described washing.
Preferably, carry out preplating behind the described acid-wash activation.
Preferably, in described polishing and the polished finish surface grinding of unplated piece being polished to roughness Ra is 0.3～0.6 micron.
Preferably, described washing is for to clean in ultrasonic wave with deionized water.
Preferably, in the described electroplating process, current density 5 peace/square decimeters, electroplating time 2～5 minutes.
Preferably, described preplating was soaked 30 minutes for unplated piece is put in the pre-plating bath, comprised nickel powder and polytetrafluoroethyldispersion dispersion in the described pre-plating bath.
Preferably, described acid-wash activation is for being to soak 12 hours in 150 milliliters/liter the hydrochloric acid soln in volumetric concentration.
The present invention carries out compatibility as electroplate liquid with nickel and tetrafluoroethylene, fluorinated ethylene propylene copolymer, mistake fluoroalkylation thing and other auxiliary agents, and wherein tetrafluoroethylene is a kind of synthetic macromolecular material that has used fluorine to replace all hydrogen atoms in the polyethylene; This material has the characteristics of antiacid alkali resistant, anti-various organic solvents, is dissolved in all solvents hardly; Simultaneously, tetrafluoroethylene has resistant to elevated temperatures characteristics, and its frictional coefficient is extremely low, so can do after the lubrication, also becomes easy clean and the desirable coating water pipe internal layer.Fluorinated ethylene propylene copolymer has the chemical stability of brilliance, fabulous sticking characteristic, and maximum operation (service) temperature is 200 ℃.Crossing the fluoroalkylation thing is to have 260 ℃ of higher continuous use temperatures, and stronger strong and unyielding degree is particularly suitable for using antiseized and chemical resistant properties use field under hot conditions.
The present invention is different with other forms of plating, form coating by twice plating, be not limited in position, mould corner and the deep trouth hole site distributes, but on the real profile surface of mould, evenly apply, the regrinding processing that this causes with regard to the discordance of having been avoided coating.The present invention is not only applicable to base materials such as various steel, copper alloy, wrought aluminium, cast iron and stainless steels, and have and to weld and hardenability, other die surface is not produced any negative impact, especially the various injectable plastic materials that are used in except that gum that can also be outstanding are shaped, on silica gel, TPO0, PVC etc.
When the present invention is used on the various injectable plastic materials, have more following advantage.
1. attach firmly;
2. shortening shaping cycle, the dry friction coefficient of die surface had a significant impact the injection moulding filling time, and coating of the present invention can make dry friction coefficient reduce greatly, thereby makes filling speed accelerate more than 10%; With automobile squab panel mould is example, and injection cycle is 60s before the coating, and injection cycle is 53 after the coating;
3. it is even to keep luminosity, thus when reducing the product injection moulding to the damage of mould surface texture, reduce the deposition of plastic cement additive at grain surface;
4. make things convenient for mould to safeguard, prevent mould oxidation and acid corrosion, and be easy to clean, can just can clean up with ammonia/water (50/50) mixture and pressurized air, if have dirtyly to produce at die cavity, can be with cotton rag wiping, die surface can return to original outward appearance and glossiness.
Concrete embodiment
The present invention is described in further detail below in conjunction with embodiment, understands the present invention to help those skilled in the art.
Embodiment 1
A kind of preparation method of nickel-polytetrafluorethylecoatings coatings may further comprise the steps:
A. pre-treatment
Unplated piece is polished with polished finish successively, goes up extension, degreasing degreasing, washing, acid-wash activation, carries out preplating;
Wherein, it is 0.3～0.5 micron that surface grinding is polished to roughness Ra, washes to cleaning in ultrasonic wave with deionized water;
Preplating was soaked 30 minutes for unplated piece is put in the pre-plating bath, comprised in the described pre-plating bath according to weight percent and calculated nickel powder and polytetrafluoroethyldispersion dispersion;
Described acid-wash activation is for being to soak 12 hours in 150 milliliters/liter the hydrochloric acid soln in volumetric concentration.
B. electroplate
Configuration electroplate liquid: comprise staple fiber 3%, nickelous chloride 30%, Trisodium Citrate 8%, single nickel salt 30%, polytetrafluoroethylene granule 20%, ethylene fluoride 1%, mistake fluoroalkylation thing 1%, propylene copolymer 1%, octyl phenyl polyoxyethylene fan 0.1% and the ammoniacal liquor of will count by weight percentage;
Again with unplated piece as negative electrode, the nickel plate as anode, is put into above-mentioned plating bath and is electroplated for some time, on plating piece, form one deck coating; In the electroplating process, current density 5 peace/square decimeters, electroplating time 2～5 minutes.
C. aftertreatment
Clean back, dry, the following finished product that obtains being electroplate with nickel-polytetrafluorethylecoatings coatings of hanging of the universe with electroplating good unplated piece water.
Embodiment 2
Implement 1 with concrete, difference is that the configuration electroplate liquid is to comprise staple fiber 2%, nickelous chloride 25%, Trisodium Citrate 6%, single nickel salt 25%, polytetrafluoroethylene granule 10%, ethylene fluoride 3%, mistake fluoroalkylation thing 2%, propylene copolymer 2%, octyl phenyl polyoxyethylene fan 0.2% and the ammoniacal liquor of will count by weight percentage.
Embodiment 3
Implement 1 with concrete, difference is that the configuration electroplate liquid is to comprise staple fiber 1%, nickelous chloride 20%, Trisodium Citrate 5%, single nickel salt 22%, polytetrafluoroethylene granule 7%, ethylene fluoride 5%, mistake fluoroalkylation thing 5%, propylene copolymer 5%, octyl phenyl polyoxyethylene fan 0.3% and the ammoniacal liquor of will count by weight percentage.
The foregoing description is preferred embodiment of the present invention, is not to be used for limiting the scope of the present invention, so all equivalences of being done with described feature of claim of the present invention and principle change or modify, all should be included within the claim scope of the present invention.
The rich coating of the formed wound of the preparation method of this nickel-polytetrafluorethylecoatings coatings is by 20% PTFE(Teflon) and no electrolytic nickel combine, this coating has surface lubrication (dry friction coefficient can be low to moderate 0.04), anti-stick, corrosion resistant (0.001 inch thickness of coating also can be born and be surpassed 300 hours SaltSprayTest), wear-resisting (is 14 milligrams with the abrasion loss under 1 kilogram of load of emery wheel of TaborCS-10 model), strong hardness characteristics such as (hardness can reach Rockwell 36-62 degree); Applicable to various steel, base materials such as copper alloy, aluminium alloy, cast iron and stainless steel, and can not produce any negative interaction to mould; Have very great help for various plastic cement, elastomeric material moulding, especially PA, PVC, TPO,, exotic materials such as GF (glass fibre), rubber, silica gel, Resins, epoxy., different with the plating of other form, the rich coating of wound is not limited in position, mould corner and the deep trouth hole site distributes, but evenly applies on the real profile surface of mould, the regrinding processing that this causes with regard to the discordance of having been avoided coating; B, coating paste firmly: the rich coating of wound prevent to come off and broken aspect have superiority very much.The plating postheat treatment will further strengthen the attaching firmness; C, shortening shaping cycle: the dry friction coefficient of die surface had a significant impact the injection moulding filling time, and the rich coating of wound can make dry friction coefficient reduce greatly, thereby made filling speed accelerate to be particularly useful for vehicle mould more than 10%.
After testing, using the pre-plating piece rete of the inventive method is 14 milligrams with the abrasion loss under 1 kilogram of load of Tabor CS-10 model emery wheel, hardness can reach Lip river formula 36 and spend to 62 degree, and 0.001 inch thickness of coating of preservative property also can be born and be surpassed 300 hours SaltSprayTest.
The above only is a better embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, feature and principle change or modify, is included in the patent claim of the present invention.
Claims (9)
1. the preparation method of a nickel-polytetrafluorethylecoatings coatings is characterized in that, may further comprise the steps:
Pre-treatment
Unplated piece is gone up extension, degreasing degreasing, washing, acid-wash activation successively;
Electroplate
Configuration electroplate liquid: comprise staple fiber 1%～3%, nickelous chloride 20%～30%, Trisodium Citrate 5%～8%, single nickel salt 22%～30%, polytetrafluoroethylene granule 7%～20%, ethylene fluoride 1%～5%, mistake fluoroalkylation thing 1%～5%, propylene copolymer 1%～5%, octyl phenyl polyoxyethylene fan 0.1%～0.3% and the ammoniacal liquor of will count by weight percentage;
Again with unplated piece as negative electrode, the nickel plate as anode, is put into above-mentioned plating bath and is electroplated for some time, on plating piece, form one deck coating;
Aftertreatment
Good unplated piece water cleans, the universe is dry with electroplating, hang the finished product that obtains being electroplate with nickel-polytetrafluorethylecoatings coatings down.
2. the preparation method of nickel-polytetrafluorethylecoatings coatings according to claim 1 is characterized in that, described go up hang before, polish and polished finish.
3. the preparation method of nickel-polytetrafluorethylecoatings coatings according to claim 1 is characterized in that, carries out electropolishing or chemical rightenning after the described washing.
4. the preparation method of nickel-polytetrafluorethylecoatings coatings according to claim 1 is characterized in that, carries out preplating behind the described acid-wash activation.
5. as the preparation method of nickel-polytetrafluorethylecoatings coatings as described in the claim 2, it is characterized in that in described polishing and the polished finish surface grinding of unplated piece being polished to roughness Ra is 0.3～0.6 micron.
6. the preparation method of nickel-polytetrafluorethylecoatings coatings according to claim 1 is characterized in that described washing is for to clean in ultrasonic wave with deionized water.
7. as the preparation method of nickel-polytetrafluorethylecoatings coatings as described in the claim 2, it is characterized in that, in the described electroplating process, current density 5 peace/square decimeters, electroplating time 2～5 minutes.
8. as the preparation method of nickel-polytetrafluorethylecoatings coatings as described in the claim 4, it is characterized in that described preplating was soaked 30 minutes for unplated piece is put in the pre-plating bath, comprised nickel powder and polytetrafluoroethyldispersion dispersion in the described pre-plating bath.
9. the preparation method of nickel-polytetrafluorethylecoatings coatings according to claim 1 is characterized in that, described acid-wash activation is for being to soak 12 hours in 150 milliliters/liter the hydrochloric acid soln in volumetric concentration.
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Cited By (6)
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| CN104818502A (en) * | 2015-04-27 | 2015-08-05 | 模德模具(东莞)有限公司 | Production process of production device applying nickel-Teflon coating |
| CN104818501A (en) * | 2015-04-27 | 2015-08-05 | 模德模具(东莞)有限公司 | Nickel-Teflon coating machining process applied to screws and nuts |
| CN104877476A (en) * | 2015-04-27 | 2015-09-02 | 模德模具(东莞)有限公司 | Nickel-teflon chemical composite coating |
| CN106048677A (en) * | 2016-08-16 | 2016-10-26 | 王世群 | Self-lubricating and anti-friction composite electroplating solution for scaffolds |
| CN107802304A (en) * | 2017-10-31 | 2018-03-16 | 无锡贝恩外科器械有限公司 | A kind of hysteroscope stapler |
| CN111636090A (en) * | 2020-05-26 | 2020-09-08 | 珠海冠宇电池股份有限公司 | Nickel-polytetrafluoroethylene coating and wear-resistant anti-static coil needle containing same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818502A (en) * | 2015-04-27 | 2015-08-05 | 模德模具(东莞)有限公司 | Production process of production device applying nickel-Teflon coating |
| CN104818501A (en) * | 2015-04-27 | 2015-08-05 | 模德模具(东莞)有限公司 | Nickel-Teflon coating machining process applied to screws and nuts |
| CN104877476A (en) * | 2015-04-27 | 2015-09-02 | 模德模具(东莞)有限公司 | Nickel-teflon chemical composite coating |
| CN106048677A (en) * | 2016-08-16 | 2016-10-26 | 王世群 | Self-lubricating and anti-friction composite electroplating solution for scaffolds |
| CN107802304A (en) * | 2017-10-31 | 2018-03-16 | 无锡贝恩外科器械有限公司 | A kind of hysteroscope stapler |
| CN111636090A (en) * | 2020-05-26 | 2020-09-08 | 珠海冠宇电池股份有限公司 | Nickel-polytetrafluoroethylene coating and wear-resistant anti-static coil needle containing same |
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