CN103225098B - A kind of preparation method of nickel-polytetrafluorethylecoatings coatings - Google Patents
A kind of preparation method of nickel-polytetrafluorethylecoatings coatings Download PDFInfo
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- CN103225098B CN103225098B CN201310203009.8A CN201310203009A CN103225098B CN 103225098 B CN103225098 B CN 103225098B CN 201310203009 A CN201310203009 A CN 201310203009A CN 103225098 B CN103225098 B CN 103225098B
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Abstract
The present invention relates to electroplating technology field, particularly relate to a kind of preparation method of nickel-polytetrafluorethylecoatings coatings; Nickel and tetrafluoroethylene, fluorinated ethylene propylene copolymer, excessively fluoroalkyl compound and other auxiliary agents are carried out compatibility as electroplate liquid by the present invention, and electroplate under certain condition, not only be widely used in the base materials such as various steel, copper alloy, wrought aluminium, cast iron and stainless steel, the various injectable plastic materials be used in except gum that can also be outstanding, as on silica gel, TPO0, PVC etc., and the wear resistance of plated film, preservative property are good, have simultaneously and can weld and hardenability, any negative impact is not produced to other die surface.
Description
Technical field
The present invention relates to electroplating technology field, particularly relate to a kind of preparation method of nickel-polytetrafluorethylecoatings coatings.
Background technology
Plating (Electroplating) is exactly the process utilizing electrolysis principle to plate other metal or alloy of skim on some metallic surface.During plating, coated metal does anode, is oxidized to positively charged ion and enters electroplate liquid; Metal products to be plated does negative electrode, and the positively charged ion of coated metal is reduced formation coating in metallic surface.For getting rid of other cationic interference, and making coating evenly, firmly, electroplate liquid need be done, to keep the cationic concentration of coated metal constant with containing the cationic solution of coated metal.
The object of plating is on base material, plate metal plating (deposit), changes substrate surface character or size.Plating can strengthen metal erosion resistance (the corrosion resistant metal of the many employings of coated metal), increase hardness, prevent abrasion, improve electroconductibility, oilness, thermotolerance and surface aesthetic.
Utilize electrolytic action on machinework, deposit the good but technology of the metal cover that performance is different with body material of attachment.Electrolytic coating is more even than hot dipping layer, general all thinner, from several micron to tens microns not etc.
By plating, decoration protectiveness and various functional upper layer can be obtained on machinework, the workpiece of wearing and tearing and processing error can also be repaired.Coating is single metal or alloy mostly, as zinc, cadmium, gold or brass, bronze etc.; Also disperse layer is had, as nickel-silicon carbide, nickel-fluorographite etc.; Also has laminating layer, as the copper-nickel-layers of chrome on steel, the silver-indium layer etc. on steel.The body material of plating, except the cast iron of iron-based, steel and stainless steel, also has non-ferrous metal, as ABS plastic, polypropylene, polysulfones and phenoplast, but before plastic electroplating, has to pass through special activation and sensitized treatment.
In order to pursue the decorative effect better electroplating and bring and powerful functional, people have carried out a lot of research to plating from the configuration of method and electroplate liquid; But at present, existing technology is perfect not enough in finished product wear resistance, hardness, preservative property and production efficiency, and use range is narrower, can only singlely be used in respectively metal want or nonmetal on.
Present mould product often adopts process for modifying surface to improve mechanical property and the work-ing life of mould.The process for treating surface of mould mainly contains anodic oxidation, hard anodizing and application rete.Anodic oxidation is carried out to mould, although form layer oxide film on 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 in a short period of time to its provide protection of mould generally at about 300HV; And oxidation film layer prepared by hard anodizing improves compared with the hardness of common anode oxidation film layer, can reach 450HV, but its processing requirement is very strict, the temperature of general electrolytic solution must control below 5 DEG C.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, the coatings such as preparation TiN, AIN, CrN, TiC, TiCN, TiAIN, because its oxidation resistance temperature is low, frictional force is large, with the reason such as basal body binding force is little, application is restricted.
Summary of the invention
In order to solve the problem, the object of the invention is to, a kind of preparation method of nickel-polytetrafluorethylecoatings coatings is provided; The plating piece using the method process to obtain not only wear resistance, preservative property is good, and has and can weld and hardenability, does not produce any negative impact to other die surface.
The present invention is achieved through the following technical solutions:
A preparation method for nickel-polytetrafluorethylecoatings coatings, comprises the following steps:
A. pre-treatment
Unplated piece is carried out upper extension, degreasing degreasing, washing, acid-wash activation successively;
B. electroplate
Configuration electroplate liquid: comprise the staple fiber 1% ~ 3% counted by weight percentage, nickelous chloride 20% ~ 30%, Trisodium Citrate 5% ~ 8%, single nickel salt 22% ~ 30%, polytetrafluoroethylene granule 7% ~ 20%, ethylene fluoride 1% ~ 5%, cross fluoroalkyl compound 1% ~ 5%, propylene copolymer 1% ~ 5%, octyl phenyl polyoxyethylene fan 0.1% ~ 0.3% and ammoniacal liquor;
Again using unplated piece as negative electrode, using nickel plate as anode, put into above-mentioned plating solution and electroplate for some time, plating piece is formed one deck coating;
C. aftertreatment
The unplated piece water electroplated cleaning, dry, the lower extension of the universe are obtained the finished product being electroplate with nickel-polytetrafluorethylecoatings coatings.
Preferably, before described upper extension, carry out polishing and polished finish.
Preferably, electropolishing or chemical rightenning is carried out after described washing.
Preferably, preplating is carried out after described acid-wash activation.
Preferably, in described polishing and polished finish, the surface grinding of unplated piece being polished to roughness Ra is 0.3 ~ 0.6 micron.
Preferably, described washing is for clean in ultrasonic wave with deionized water.
Preferably, in described electroplating process, current density 5 pacifies/square decimeter, electroplating time 2 ~ 5 minutes.
Preferably, described preplating is soaked 30 minutes for being put into by unplated piece in pre-plating solution, and described pre-plating solution comprises nickel powder and polytetrafluoroethyldispersion dispersion.
Preferably, described acid-wash activation be volumetric concentration be in the hydrochloric acid soln of 150 milliliters/liter soak 12 hours.
Nickel and tetrafluoroethylene, fluorinated ethylene propylene copolymer, excessively fluoroalkyl compound and other auxiliary agents are carried out compatibility as electroplate liquid by the present invention, and wherein tetrafluoroethylene is a kind of synthetic macromolecular material employing fluorine and replace all hydrogen atoms in polyethylene; This material has the feature of antiacid alkali resistant, anti-various organic solvent, is dissolved in all solvents hardly; Meanwhile, tetrafluoroethylene has resistant to elevated temperatures feature, and its frictional coefficient is extremely low, so after can making lubrication, also becomes easy clean and desirable coating that is water pipe internal layer.Fluorinated ethylene propylene copolymer has remarkable chemical stability, fabulous not sticky characteristic, and maximum operation (service) temperature is 200 DEG C.Crossing fluoroalkyl compound is have higher continuous use temperature 260 DEG C, stronger strong and unyielding degree, is particularly suitable for using antiseized and chemical resistant properties under the high temperature conditions to use field.
The present invention is different from other forms of plating, coating is formed by twice plating, be not limited in position, mould corner and the distribution of deep trouth hole site, but evenly apply on the surface in the real profile of mould, avoiding problems the discordance of coating and the attrition process again that causes.The present invention is not only applicable to the base materials such as various steel, copper alloy, wrought aluminium, cast iron and stainless steel, and have and can weld and hardenability, any negative impact is not produced to other die surface, especially the various injectable plastic materials be used in except gum that can also be outstanding are shaped, as on silica gel, TPO0, PVC etc.
When the present invention is used on various injectable plastic material, has more and have the following advantages.
1. attach firmly;
2. shorten shaping cycle, the dry friction coefficient of die surface had a significant impact the mould filling time, and coating of the present invention can make dry friction coefficient greatly reduce, thus made filling speed accelerate more than 10%; For automobile rear wall board mold, before coating, injection cycle is 60s, and after coating, injection cycle is 53;
3. maintain luminosity even, thus the damage to mould surface texture when reducing product injection moulding, reduce the deposition of plastic cement additive at grain surface;
4. facilitate mould to safeguard, prevent mould to be oxidized and acid corrosion, and be easy to cleaning, just can be able to clean up with ammonia/water (50/50) mixture and pressurized air, dirtyly to produce at die cavity if had, can with cotton rag wiping, die surface can return to original outward appearance and glossiness.
Concrete embodiment
Below in conjunction with embodiment, the present invention is described in further detail, understands the present invention to help those skilled in the art.
Embodiment 1
A preparation method for nickel-polytetrafluorethylecoatings coatings, comprises the following steps:
A. pre-treatment
Unplated piece carried out successively polishing and polished finish, upper extension, degreasing degreasing, washing, acid-wash activation, carry out preplating;
Wherein, it is 0.3 ~ 0.5 micron that surface grinding is polished to roughness Ra, washes as cleaning in ultrasonic wave with deionized water;
Preplating is soaked 30 minutes for being put into by unplated piece in pre-plating solution, and described pre-plating solution comprises according to weight percent calculating nickel powder and polytetrafluoroethyldispersion dispersion;
Described acid-wash activation be volumetric concentration be in the hydrochloric acid soln of 150 milliliters/liter soak 12 hours.
B. electroplate
Configuration electroplate liquid: comprise the staple fiber 3% counted by weight percentage, nickelous chloride 30%, Trisodium Citrate 8%, single nickel salt 30%, polytetrafluoroethylene granule 20%, ethylene fluoride 1%, cross fluoroalkyl compound 1%, propylene copolymer 1%, octyl phenyl polyoxyethylene fan 0.1% and ammoniacal liquor;
Again using unplated piece as negative electrode, using nickel plate as anode, put into above-mentioned plating solution and electroplate for some time, plating piece is formed one deck coating; In electroplating process, current density 5 pacifies/square decimeter, electroplating time 2 ~ 5 minutes.
C. aftertreatment
Rear for the unplated piece water electroplated cleaning, dry, the lower extension of the universe are obtained the finished product being electroplate with nickel-polytetrafluorethylecoatings coatings.
Embodiment 2
1 is implemented with concrete, difference is, configuration electroplate liquid is comprise the staple fiber 2% counted by weight percentage, nickelous chloride 25%, Trisodium Citrate 6%, single nickel salt 25%, polytetrafluoroethylene granule 10%, ethylene fluoride 3%, cross fluoroalkyl compound 2%, propylene copolymer 2%, octyl phenyl polyoxyethylene fan 0.2% and ammoniacal liquor.
Embodiment 3
1 is implemented with concrete, difference is, configuration electroplate liquid is comprise the staple fiber 1% counted by weight percentage, nickelous chloride 20%, Trisodium Citrate 5%, single nickel salt 22%, polytetrafluoroethylene granule 7%, ethylene fluoride 5%, cross fluoroalkyl compound 5%, propylene copolymer 5%, octyl phenyl polyoxyethylene fan 0.3% and ammoniacal liquor.
Above-described embodiment, just preferred embodiment of the present invention, is not used for limiting the scope of the present invention, therefore all equivalences done with the feature described in the claims in the present invention and principle change or modify, and all should be included within the claims in the present invention scope.
It is by the PTFE(Teflon of 20% that the wound that the preparation method of this nickel-polytetrafluorethylecoatings coatings is formed wins coating) and combine without electrolytic nickel, this coating has surface lubrication (dry friction coefficient can be low to moderate 0.04), the feature such as anti-stick, corrosion resistant (0.001 inch of thickness of coating also can bear the SaltSprayTest more than 300 hours), wear-resisting (be 14 milligram by the abrasion loss under emery wheel 1 Kg load of TaborCS-10 model), strong hardness (hardness can reach Rockwell 36-62 degree); Be applicable to various steel, the base materials such as copper alloy, aluminium alloy, cast iron and stainless steel, and any negative interaction can not be produced to mould; For various plastic cement, elastomeric material is shaping has very great help, especially PA, PVC, TPO, the exotic materials such as GF (glass fibre), rubber, silica gel, epoxy resin., different from the plating of other form, the rich coating of wound is not limited in position, mould corner and the distribution of deep trouth hole site, but applies at the real profile surface uniform of mould, avoiding problems the discordance of coating and the attrition process again that causes; B, coating paste firmly: the rich coating of wound prevent from coming off and broken in have superiority very much.Plating postheat treatment, will strengthen attaching firmness further; C, shortening shaping cycle: the dry friction coefficient of die surface had a significant impact the mould filling time, the rich coating of wound can make dry friction coefficient greatly reduce, thus makes filling speed accelerate more than 10%, is particularly useful for vehicle mould.
After testing, the abrasion loss under pre-plating piece rete Tabor CS-10 model emery wheel 1 kilogram of load of the inventive method is used to be 14 milligrams, hardness can reach Lip river formula 36 degree to 62 degree, and preservative property 0.001 inch of thickness of coating also can bear the SaltSprayTest more than 300 hours.
The above is only better embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.
Claims (7)
1. a preparation method for nickel-polytetrafluorethylecoatings coatings, is characterized in that, comprises the following steps:
Pre-treatment
Unplated piece is carried out upper extension, degreasing degreasing, washing, acid-wash activation successively;
Plating
Configuration electroplate liquid: comprise the staple fiber 1% ~ 3% counted by weight percentage, nickelous chloride 20% ~ 30%, Trisodium Citrate 5% ~ 8%, single nickel salt 22% ~ 30%, polytetrafluoroethylene granule 7% ~ 20%, ethylene fluoride 1% ~ 5%, cross fluoroalkyl compound 1% ~ 5%, propylene copolymer 1% ~ 5%, octyl phenyl polyoxyethylene ether 0.1% ~ 0.3% and ammoniacal liquor;
Again using unplated piece as negative electrode, using nickel plate as anode, put into above-mentioned plating solution and electroplate for some time, plating piece is formed one deck coating;
Aftertreatment
The unplated piece water electroplated cleaning, dry, the lower extension of the universe are obtained the finished product being electroplate with nickel-polytetrafluorethylecoatings coatings; Carry out preplating after described acid-wash activation, described preplating is soaked 30 minutes for being put into by unplated piece in pre-plating solution, and described pre-plating solution comprises nickel powder and polytetrafluoroethyldispersion dispersion.
2. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 1, is characterized in that, before described upper extension, carry out polishing and polished finish.
3. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 1, is characterized in that, carry out electropolishing or chemical rightenning after described washing.
4. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 2, is characterized in that, in described polishing and polished finish, the surface grinding of unplated piece being polished to roughness Ra is 0.3 ~ 0.6 micron.
5. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 1, it is characterized in that, described washing is for clean in ultrasonic wave with deionized water.
6. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 2, it is characterized in that, in described electroplating process, current density 5 pacifies/square decimeter, electroplating time 2 ~ 5 minutes.
7. the preparation method of nickel-polytetrafluorethylecoatings coatings as claimed in claim 1, is characterized in that, described acid-wash activation is be soak 12 hours in the hydrochloric acid soln of 150 milliliters/liter in volumetric concentration.
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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 |
| CN104877476A (en) * | 2015-04-27 | 2015-09-02 | 模德模具(东莞)有限公司 | Nickel-teflon chemical composite 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 |
| 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 |
| CN111636090B (en) * | 2020-05-26 | 2022-03-01 | 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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| US20080271712A1 (en) * | 2005-05-18 | 2008-11-06 | Caterpillar Inc. | Carbon deposit resistant component |
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