CN102936742A - Method for electroplating black trivalent chromium on surface of plastic for vehicle decorating strip - Google Patents

Method for electroplating black trivalent chromium on surface of plastic for vehicle decorating strip Download PDF

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CN102936742A
CN102936742A CN2012104408186A CN201210440818A CN102936742A CN 102936742 A CN102936742 A CN 102936742A CN 2012104408186 A CN2012104408186 A CN 2012104408186A CN 201210440818 A CN201210440818 A CN 201210440818A CN 102936742 A CN102936742 A CN 102936742A
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nickel
concentration
chromium
plastic
plating
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CN102936742B (en
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江民初
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Jiaxing Minhui Automotive Parts Co Ltd
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Jiaxing Minhui Automotive Parts Co Ltd
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Abstract

The invention provides a method for electroplating black trivalent chromium on the surface of plastic for a vehicle decorating strip. The method includes the steps of surface roughening processing, surface neutralizing processing, surface activating treatment, surface accelerated processing, chemical nickel precipitating, plating bottom nickel, plating acid copper, sequentially plating semi-bright nickel, full-bright nickel and microporous nickel and plating the black trivalent chromium. According to the method, the surface of a plastic workpiece is subjected to processes of ultrasonic grease removing, roughening, neutralizing, colloid palladium activating, accelerating and the like, the foundation is established for subsequently plating copper, nickel and finally the black trivalent chromium, the process is stable, and the formula is reasonable. Besides, when the formula is selected, a plating solution which has small influence on the environment is used as far as possible, and the electroplating process is environment-friendly.

Description

A kind of automotive trim strip is electroplated the method for the black chromium of trivalent with plastic surface
Technical field
The present invention relates to the electroplating technology field, relate in particular to a kind of automotive trim strip is electroplated the black chromium of trivalent with plastic surface method.
Background technology
Electroplating black chromium is a kind of special plating in the chromium plating system, and black chromium obtains the chromium metal of disperse in the chromium sesquioxide hydrate through strong electron exchange in having the chromic acid of strong oxidizing property.Chromium metal forms the coating of built-in type, and this coating is dendritic structure, and crystallization is loose, and incident light wave is all absorbed, and causes coating to be black.Because the stability of black chromium coating is high, is widely used in the Application Areass such as automobile component, opticinstrument, photographic apparatus, weaponry.
At plastic surface plating decorations sexavalent chrome and plating decorations trivalent chromium are arranged in the prior art, but electroplate sexavalent chrome coating skewness, bonding force looks into, larger to environmental protection and human health damage.Automotive trim strip of the prior art adopts the chromic technique of plating with plastic surface, (publication number is: CN102242384A): relate to a kind of process for plating trivalent chromium on surfaces of plastic, this technique comprises the surperficial grease of removing, surface microscopic roughening treatment, reduction processing, colloidal palladium activation, dispergation processing, plates chemical nickel, a plating watt nickel, plates the steps such as bright copper, bright nickel plating, plating trivalent chromium such as Chinese patent application.Although thereby this technique reaches stable, the uniform effect of coating by before the plating trivalent chromium plastic surface repeatedly being processed.But before the plating trivalent chromium, it is not in place that plastic surface is processed, and causes that the coating covering power is poor, the easy embrittlement of coating, work-ing life be short.
Summary of the invention
Technical problem to be solved by this invention is, for the above-mentioned deficiency of prior art, proposes a kind of better performances, coating automotive trim strip stable, environmental protection are electroplated the black chromium of trivalent with plastic surface method of electroplating.
The present invention solves the technical scheme that its technical problem adopts, and proposes the method that a kind of automotive trim strip is electroplated the black chromium of trivalent with plastic surface, and the method comprising the steps of:
A, with automotive trim strip with plastic cement at sodium hydroxide NaOH, yellow soda ash Na 2CO 3With water glass Na 2SiO 3Clean in the mixing solutions and remove grease, immerse chromic trioxide CrO behind the removal grease 3With sulfuric acid H 2SO 4Carry out surface coarsening in the mixed solution and process, then put into hydrochloric acid soln and carry out the surface neutralization, adopt colloidal palladium solution to carry out surface activation process after the neutralization, then at sulfuric acid H 2SO 4Carrying out the surface in the solution accelerates to process;
B, the plastic cement after the above-mentioned surface treatment is being contained the sulfuric acid nickel 2SO 4, inferior sodium phosphate Na 2PO 3With Trisodium Citrate C 6H 5Na 3O 7Mixing solutions in carry out chemical sinking nickel, then containing the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O, boric acid H 3BO 3Plate bottoming nickel in the mixing solutions;
C, the plastic cement after the above-mentioned processing is put into copper sulfate CuSO 4With sulfuric acid H 2SO 4In the mixing solutions, carry out acid coppering and process, then plate successively half light nickel, full light nickel and microporous nickel, plate half light nickel, light nickel is the same with the main component of microporous nickel plating bath entirely, is the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O and boric acid H 3BO 3Mixing solutions;
D, at last at trivalent chromium base chromium sulphate Cr 2(SO 4) 3, stablizer H 2SiF 4, wetting agent CH 3(CH 2) 11SO 3Na, boric acid H 3BO 3The black chromium of plating trivalent in the mixing solutions.
As preferably, each constituent concentration in the degrease mixing solutions described in the steps A: the concentration of sodium hydroxide NaOH is 20 ~ 35g/L, yellow soda ash Na 2CO 3Concentration be 20 ~ 38g/L, water glass Na 2SiO 3Concentration be 55 ~ 93g/L.
Surface degrease step can know that automotive trim strip with greasy dirt and other impurity of plastic surface, impels surface coarsening even, improves binding force of cladding material.
As preferably, the surface coarsening described in the steps A is processed the concentration of each component in the mixed solution: chromic trioxide CrO 3Concentration be 120 ~ 280g/L, sulfuric acid H 2SO 4Concentration be 210 ~ 340g/L; Further preferred, chromic trioxide CrO 3Concentration be 150 ~ 230g/L, sulfuric acid H 2SO 4Concentration be 210 ~ 270g/L.
Chromic trioxide CrO 3Be the main salt in the plating bath, the mechanism by oxidation-reduction reaction and electron exchange deposits chromium metal and produces chromium sesquioxide hydrate etc. with plastic surface at automotive trim strip, so that the coating blackout.Chromic trioxide CrO 3Covering power to plating bath has considerable influence, if chromic trioxide CrO 3Content is high, and then covering power is strong, and crystallization is careful, if but chromic trioxide CrO 3Too high levels then can be so that the hardness decline of coating.
In addition, chromic trioxide CrO 3With sulfuric acid H 2SO 4As etching reagent can be at the corrosion automotive trim strip with plastic surface forming the micro-rough surface at automotive trim strip with plastic surface, when guaranteeing electroless plating needed " snap close effect ", improve automotive trim strip with the bonding force of plastic surface and coating with this.Yet sulfate radical can reduce the color characteristics of coating, so that the coating jaundice in order to reach simultaneously the corrosion automotive trim strip with plastic surface and to reduce harmful effect, needs the accurately content of configuration sulfuric acid.
As preferably, the concentration of hydrochloric acid solution of the surperficial neutralizing treatment described in the steps A is 18 ~ 68g/L.
The surface neutralizing treatment mainly is to remove the sexavalent chrome that produces in the surface coarsening treating processes, prevents hexavalent chromium polluted subsequent technique.
As preferably, the concentration of each component in the colloidal palladium solution of the surface activation process described in the steps A: Palladous chloride PdCl 2Concentration be 1.1 ~ 1.9g/L, tin protochloride SnCl 2Concentration be 1.2 ~ 4.5g/L; Further preferred, Palladous chloride PdCl 2Concentration be 1.4 ~ 1.7g/L, tin protochloride SnCl 2Concentration be 3.1 ~ 4.5g/L.
In the colloidal palladium solution, Palladous chloride is covered in the automotive trim strip plastic surface, for follow-up chemical nickel provides catalytic center, the tin ion of tin protochloride then can be deposited on the group of chemical combination attitude around the palladium ion, the oxidation of avoiding palladium ion in water or in the air and coming off can increase the life cycle of colloidal palladium solution.
As preferably, accelerate the sulfuric acid H that processes on the surface described in the steps A 2SO 4Strength of solution is 25 ~ 82g/L.
The surface is accelerated to process to refer to utilize in the sulfuric acid removal colloidal palladium solution and is coated on palladium tin protochloride on every side, the palladium metal particle is come out, so that the heavy nickel technique of subsequent chemistry is more smooth and easy.
As preferably, each concentration of component in the chemical sinking nickel mixing solutions described in the step B: sulfuric acid nickel 2SO 4Concentration be 15 ~ 28g/L, inferior sodium phosphate Na 2PO 3Concentration be 23 ~ 32g/L, Trisodium Citrate C 6H 5Na 3O 7Concentration be 11 ~ 24g/L; Further preferred, the sulfuric acid nickel 2SO 4Concentration be 22 ~ 28g/L, inferior sodium phosphate Na 2PO 3Concentration be 23 ~ 27g/L, Trisodium Citrate C 6H 5Na 3O 7Concentration be 11 ~ 24g/L.
Chemical sinking nickel refers to deposit the thin conductive layer of one deck at automotive trim strip with the palladium metal that plastic surface has catalytic activity, is convenient to the various metals of follow-up plating.
In the chemical sinking nickel process, single nickel salt provides nickel element; Inferior sodium phosphate is strong reductant, and it is with the nickel ion (Ni in the single nickel salt 2+) be reduced into metallic nickel; Trisodium Citrate is buffer reagent, and it is so that the reaction of inferior sodium phosphate reduced nickel ion is more mild.Among the present invention, adopt Trisodium Citrate as buffer reagent, replaced existing boric acid, Trisodium Citrate is more friendly and cost is lower to environment, and by test of the present invention, the buffering energy of Trisodium Citrate also is better than boric acid, and this mainly is because have freely citric acid in the Trisodium Citrate, and hydrogen ion and hydroxide ion can be provided.
As preferably, each concentration of component in the mixing solutions of the plating bottoming nickel described in the step B: aqueous sulfuric acid nickel 2SO 4-7H 2The concentration of O is 87 ~ 120g/L, moisture nickelous chloride NiCl 2-6H 2The concentration of O is 5 ~ 84g/L, boric acid H 3BO 3Concentration be 64 ~ 79g/L; Further preferred, the aqueous sulfuric acid nickel 2SO 4-7H 2The concentration of O is 94 ~ 110g/L, moisture nickelous chloride NiCl 2-6H 2The concentration of O is 51 ~ 84g/L, boric acid H 3BO 3Concentration be 68 ~ 72g/L.
In chemical sinking nickel, by redox reaction so that automotive trim strip has covered the nickel dam of the conduction of layer with plastic surface; And in plating bottoming nickel, then adopt electrochemical method to plate one deck nickel in chemical nickel, further strengthen the electroconductibility of coating.In this step, the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O provides electrochemical reaction required nickel ion.
As preferably, each concentration of component in the mixing solutions of the acid coppering described in the step C: copper sulfate CuSO 4Concentration be 85 ~ 116g/L, sulfuric acid H 2SO 4Concentration be 65 ~ 85g/L.Further preferred, copper sulfate CuSO 4Concentration be 110 ~ 116g/L, sulfuric acid H 2SO 4Concentration be 65 ~ 80g/L.
The purpose of acid coppering is to utilize the characteristic of copper sulfate to use luminance brightness and the planarization of plastic surface to improve automotive trim strip, and can also improve the toughness of coating integral body.This is that its ductility is better because copper coating is compared nickel coating and other metal plating, so after plating sour copper layer, the toughness of whole coating and leveling property are improved.
Successively plating half light nickel described in the step C, full light nickel and microporous nickel: plate in the processing step of half light nickel, full light nickel and microporous nickel, the main component of plating bath is the same, and the concentration of each component is: the aqueous sulfuric acid nickel 2SO 4-7H 2The concentration of O is 150 ~ 240g/L, moisture nickelous chloride Nicl 2-6H 2The concentration of O is 55 ~ 85g/L, boric acid H 3BO 3Concentration be 1 ~ 3g/L; Plate wherein that plating bath also is added with the butynediol additive in the half light nickel step, plate that plating bath also is added with the saccharin sodium additives in the full light nickel, plating bath also is added with 2-sulfonic group sodium phenyl aldehyde additive in the plating microporous nickel.
Plate half light nickel, full light nickel is the same with solution composition in the microporous nickel, additive is different, thus so that the coating structure that forms is different, so that each step all plays different effects.Particularly, plate half light nickel and refer to that half light nickel coating is columnar structure, can improve the corrosion stability of coating at the nickel dam of automotive trim strip with plastic surface plating one deck half light; And this layer electronickelling has good leveling and low porosity.Plate full light nickel and refer to that full light nickel coating is laminate structure, can improve the luminance brightness of coating at the nickel dam of automotive trim strip with the full light of plastic surface plating one deck.The plating microporous nickel refers to plate the coating that one deck contains numerous non-conductive particulate uniformly at automotive trim strip with plastic surface, can disperse corrosion current, reduces corrosion electric current density, further improves the coating erosion resistance.
In addition, in plating half light nickel, full light nickel and microporous nickel step, stablizer has all adopted boric acid but not Trisodium Citrate in chemical sinking nickel and plating bottoming nickel step.This is because more pay close attention to the compactness of covering power and the coating of coating when plating half light nickel, full light nickel and microporous nickel step, and in chemical sinking nickel and plating bottoming nickel step, nickel coating mainly helps out.In plating bath, boric acid can not only play the effect of stablizer plating bath, and can improve covering power and the covering power of plating bath, improves compactness of electroplating.Therefore choosing of boric acid needs comprehensive consideration environmental factors and its reclamation element to coating.
As preferably, each concentration of component in the black chromium mixing solutions of the plating trivalent described in the step D: trivalent chromium base chromium sulphate Cr 2(SO 4) 3Concentration be 85 ~ 165g/L, stablizer H 2SiF 4Concentration be 25 ~ 55ml/L, wetting agent CH 3(CH 2) 11SO 3The concentration of Na is 5 ~ 65ml/L, boric acid H 3BO 3Concentration be 15 ~ 35g/L.Further preferred, trivalent chromium base chromium sulphate Cr 2(SO 4) 3Concentration be 120 ~ 150g/L, stablizer H 2SiF 4Concentration be 25 ~ 50ml/L, wetting agent CH 3(CH 2) 11SO 3The concentration of Na is 27 ~ 65ml/L, boric acid H 3BO 3Concentration be 15 ~ 35g/L.
In the black chromium step of plating trivalent, stablizer H 2SiF 4Be used for forming stable compound with trivalent chromium, can impact walk if its concentration is too high, then easily blackstreak occurs or cause that color and luster is inhomogeneous at coating surface if cross to hang down; Wetting agent CH 3(CH 2) 11SO 3Surface tension, raising that Na can reduce liquid phase and solid phase walk; Boric acid uses as buffer reagent, can also take into account stabilizer function.Trivalent chromium base chromium sulphate Cr 2(SO 4) 3Trivalent chromic ion is provided, is different from existing hexavalent chromium, that trivalent chromic ion has is nontoxic, the characteristic of environmental protection.
The present invention by automotive trim strip with plastic workpiece surface with art breading such as ultrasonic wave grease removal, alligatoring, neutralization, colloidal palladium activation and acceleration, be follow-up electro-coppering, nickel and the final black chromium of the trivalent process stabilizing that lays the first stone, prescription rationally.In addition, the present invention selects the plating bath little to environmental influence as far as possible when prescription is chosen, so that more environmental protection of electroplating technology.Further, the present invention is in the final step of plating in addition half light nickel, full light nickel and microporous nickel before the black chromium of trivalent of electroplating, so that the final coating that forms is more stable, color and luster is smooth, even, longer service life.
Embodiment
Below be that specific embodiments of the invention are further described technical scheme of the present invention, but the present invention is not limited to these embodiment.
Automotive trim strip of the present invention comprises the automotive trim strip plastic workpiece that the materials such as all kinds of ABS, PC, PP, PVC, PET are made with plastic cement.
The method of electroplating the black chromium of trivalent with plastic workpiece at above-mentioned automotive trim strip comprises the steps:
(1) surperficial degrease: at sodium hydroxide NaOH, yellow soda ash Na 2CO 3And Na 2SiO 3Clean in the mixing solutions.In this step, the concentration proportioning of each component in different embodiment sees Table one in the mixing solutions:
Table one
(2) surface coarsening is processed: at chromic trioxide CrO 3With sulfuric acid H 2SO 4Carry out in the mixed solution.In this step, chromic trioxide CrO 3With sulfuric acid H 2SO 4Concentration proportioning in different embodiment sees Table two:
Table two
(3) surperficial neutralizing treatment: the automotive trim strip after the surface coarsening processing is put into hydrochloric acid soln with plastic cement carry out.In this step, hydrochloric acid soln sees Table three at the concentration proportioning of different embodiment:
Table three
(4) surface activation process: surface activation process adopts colloidal palladium solution, colloidal palladium Chlorine in Solution palladium PdCl 2With tin protochloride SnCl 2Concentration proportioning at different embodiment sees Table four:
Table four
(5) surface accelerates to process: at sulfuric acid H 2SO 4Carry out in the solution.Sulphuric acid soln sees Table five at the concentration proportioning of different embodiment in this step:
Table five
(6) chemical sinking nickel: containing the sulfuric acid nickel 2SO 4, inferior sodium phosphate Na 2PO 3With Trisodium Citrate C 6H 5Na 3O 7Carry out in the mixing solutions.In this step, the concentration proportioning of each component in different embodiment sees Table six in the mixing solutions:
Table six
(7) plating bottoming nickel: containing the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O, boric acid H 3BO 3Mixing solutions in carry out.In this step, the concentration proportioning of each component in different embodiment sees Table seven in the mixing solutions:
Table seven
(8) acid coppering: at copper sulfate CuSO 4With sulfuric acid H 2SO 4Carry out in the mixing solutions.Copper sulfate CuSO 4With sulfuric acid H 2SO 4Concentration proportioning at different embodiment sees Table eight:
Table eight
(9) plate successively half light nickel, full light nickel and microporous nickel.Plate in the processing step of half light nickel, full light nickel and microporous nickel, the main component of plating bath is the same, is the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O and boric acid H 3BO 3Mixing solutions, but plate in the processing step of half light nickel, full light nickel and microporous nickel, and the additive of different step is different.Plate that half light nickel, full light nickel and microporous nickel see Table respectively nine at the concentration proportioning of different embodiment, table ten and table ten one.
Table nine (plating half light nickel)
Table ten (plating full light nickel)
Table ten one (plating microporous nickel)
(10) the black chromium of plating trivalent: at trivalent chromium base chromium sulphate Cr 2(SO 4) 3, stablizer H 2SiF 4, wetting agent CH 3(CH 2) 11SO 3Na, boric acid H 3BO 3Carry out in the mixing solutions.In this step, the concentration proportioning of each component in different embodiment sees Table 12 in the mixing solutions:
Table ten two
The trivalent black chromium plating color of the automotive trim strip usefulness plastic surface that process embodiment 1 to embodiment 5 obtains is smooth exquisiteness all, the phenomenon variegated, that colourity is inhomogeneous do not occur.And this coating is stable, firm, and work-ing life is longer.Further, the trade effluent environmental pollution that the inventive method produces is less, environmental protection and reduced the cost that factory's back segment is processed trade effluent.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (10)

1. an automotive trim strip is electroplated the method that trivalent is deceived chromium with plastic surface, and the method comprising the steps of:
A, with automotive trim strip with plastic cement at sodium hydroxide NaOH, yellow soda ash Na 2CO 3With water glass Na 2SiO 3Clean in the mixing solutions and remove grease, immerse chromic trioxide CrO behind the removal grease 3With sulfuric acid H 2SO 4Carry out surface coarsening in the mixed solution and process, then put into hydrochloric acid soln and carry out the surface neutralization, adopt colloidal palladium solution to carry out surface activation process after the neutralization, then at sulfuric acid H 2SO 4Carrying out the surface in the solution accelerates to process;
B, the plastic cement after the above-mentioned surface treatment is being contained the sulfuric acid nickel 2SO 4, inferior sodium phosphate Na 2PO 3With Trisodium Citrate C 6H 5Na 3O 7Mixing solutions in carry out chemical sinking nickel, then containing the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O, boric acid H 3BO 3Plate bottoming nickel in the mixing solutions;
C, the plastic cement after the above-mentioned processing is put into copper sulfate CuSO 4With sulfuric acid H 2SO 4In the mixing solutions, carry out acid coppering and process, then plate successively half light nickel, full light nickel and microporous nickel, plate half light nickel, light nickel is the same with the main component of microporous nickel plating bath entirely, is the aqueous sulfuric acid nickel 2SO 4-7H 2O, moisture nickelous chloride NiCl 2-6H 2O and boric acid H 3BO 3Mixing solutions;
D, at last at trivalent chromium base chromium sulphate Cr 2(SO 4) 3, stablizer H 2SiF 4, wetting agent CH 3(CH 2) 11SO 3Na, boric acid H 3BO 3The black chromium of plating trivalent in the mixing solutions.
2. automotive trim strip according to claim 1 is electroplated the method that trivalent is deceived chromium with plastic surface, and it is characterized in that: each component and concentration thereof are in the degrease mixing solutions described in the steps A: the concentration of sodium hydroxide NaOH is 20 ~ 35g/L, yellow soda ash Na 2CO 3Concentration be 20 ~ 38g/L, water glass Na 2SiO 3Concentration be 55 ~ 93g/L.
3. automotive trim strip according to claim 1 and 2 is electroplated the method that trivalent is deceived chromium with plastic surface, it is characterized in that: each component and concentration thereof are in the surface coarsening processing mixed solution described in the steps A: chromic trioxide CrO 3Concentration be 120 ~ 280g/L, sulfuric acid H 2SO 4Concentration be 210 ~ 340g/L.
4. automotive trim strip according to claim 1 and 2 is electroplated the method that trivalent is deceived chromium with plastic surface, and it is characterized in that: each component and concentration thereof are in the colloidal palladium solution of the surface activation process described in the steps A: Palladous chloride PdCl 2Concentration be 1.1~1.9g/L, tin protochloride SnCl 2Concentration be 1.2 ~ 4.5g/L.
5. automotive trim strip according to claim 1 is electroplated the method that trivalent is deceived chromium with plastic surface, and it is characterized in that: each component and concentration thereof are in the chemical sinking nickel mixing solutions described in the step B: the sulfuric acid nickel 2SO 4Concentration be 15 ~ 28g/L, inferior sodium phosphate Na 2PO 3Concentration be 23 ~ 32g/L, Trisodium Citrate C 6H 5Na 3O 7Concentration be 11 ~ 24g/L.
6. automotive trim strip is electroplated the method that trivalent is deceived chromium with plastic surface according to claim 1 or 5, and it is characterized in that: each component and concentration thereof are in the mixing solutions of the plating bottoming nickel described in the step B: the aqueous sulfuric acid nickel 2SO 4-7H 2The concentration of O is 87 ~ 120g/L, moisture nickelous chloride NiCl 2-6H 2The concentration of O is 5 ~ 84g/L, boric acid H 3BO 3Concentration be 64 ~ 79g/L.
7. automotive trim strip according to claim 1 is electroplated the method that trivalent is deceived chromium with plastic surface, and it is characterized in that: each component and concentration thereof are in the mixing solutions of the acid coppering described in the step C: copper sulfate CuSO 4Concentration be 85 ~ 116g/L, sulfuric acid H 2SO 4Concentration be 65 ~ 85g/L.
8. according to claim 1 or the 7 described automotive trim strips method of electroplating the black chromium of trivalent with plastic surface, it is characterized in that: in the technique of the plating half light nickel described in the step C, full light nickel and microporous nickel in the mixing solutions each component and concentration thereof for being aqueous sulfuric acid nickel: 150 ~ 240g/L, moisture nickelous chloride: 55 ~ 85g/L, boric acid: 1 ~ 3g/L.
9. automotive trim strip according to claim 8 is electroplated the method for the black chromium of trivalent with plastic surface, it is characterized in that: the successively plating half light nickel described in the step C, full light nickel and microporous nickel: plate in the processing step of half light nickel, full light nickel and microporous nickel, each component and the concentration thereof of plating bath are: the aqueous sulfuric acid nickel 2SO 4The concentration of-7H2O is 150 ~ 240g/L, moisture nickelous chloride Nicl 2-6H 2The concentration of O is 55 ~ 85g/L, boric acid H 3BO 3Concentration be 1 ~ 3g/L; Plate wherein that plating bath also is added with the butynediol additive in the half light nickel step, plate that plating bath also is added with the saccharin sodium additives in the full light nickel, plating bath also is added with 2-sulfonic group sodium phenyl aldehyde additive in the plating microporous nickel.
10. automotive trim strip according to claim 1 is electroplated the method that trivalent is deceived chromium with plastic surface, it is characterized in that: each component and concentration thereof in the black chromium mixing solutions of the plating trivalent described in the step D are: trivalent chromium base chromium sulphate Cr 2(SO 4) 3Concentration be 85 ~ 165g/L, stablizer H 2SiF 4Concentration be 25 ~ 55ml/L, wetting agent CH 3(CH 2) 11SO 3The concentration of Na is 5 ~ 65ml/L, boric acid H 3BO 3Concentration be 15 ~ 35g/L.
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CN105568337A (en) * 2016-01-18 2016-05-11 苏州市华婷特种电镀有限公司 Method for pretreatment in electroplating process
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CN107227474A (en) * 2017-06-27 2017-10-03 东莞市纳百川电子科技有限公司 A kind of metal surface treatment process
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