CN104928735A - Steel part cyanide-free electroplating tin bronze electroplating liquid and preparation method thereof - Google Patents
Steel part cyanide-free electroplating tin bronze electroplating liquid and preparation method thereof Download PDFInfo
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- CN104928735A CN104928735A CN201510387381.8A CN201510387381A CN104928735A CN 104928735 A CN104928735 A CN 104928735A CN 201510387381 A CN201510387381 A CN 201510387381A CN 104928735 A CN104928735 A CN 104928735A
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Abstract
The invention discloses steel part cyanide-free electroplating tin bronze electroplating liquid. Components comprise 12 g/L-17 g/L of Cu<2+>, 240 g/L-280 g/L of potassium pyrophosphate, 1.5 g/L-2.5 g/L of Sn<2+>, 30 g/L-50 g/L of disodium hydrogen phosphate or dipotassium phosphate, 5 g/L-10 g/L of sodium citrate and 30 g/L-40 g/L of nitrilotriacetic acid. A preparation method of the steel part cyanide-free electroplating tin bronze electroplating liquid comprises the following steps that 1, the potassium pyrophosphate and one half of the disodium hydrogen phosphate or dipotassium phosphate are dissolved in hot water; 2, the potassium pyrophosphate is dissolved; 3, the nitrilotriacetic acid is dissolved through sodium hydroxide and added into mixed liquid, and the other half of the disodium hydrogen phosphate or dipotassium phosphate is added; 4, the pH value of a solution is adjusted to 8.3-8.8, and a plating solution is filtered; 5, a pure cooper plate is adopted as an anode of the plating solution, a waste steel plate is adopted as a cathode of the plating solution, an electrolytic tank is formed, electrolysis is firstly carried out for three to four hours, and then stannous pyrophosphate is added with stirring while electrolysis is carried out.
Description
Technical field
The present invention relates to a kind of electroplate liquid, be specifically related to a kind of steel part cyanideless electro-plating tinbronze electroplate liquid and preparation method thereof.
Background technology
Gunmetal is commonly called as tinbronze, and eleetrotinplate bronze plating is widely used in the industrial sectors such as light industry, instrument, machinery, communication, household electrical appliance, handicraft, is the alloy plating that China is most widely used, industrial scale is maximum.
For a long time, eleetrotinplate bronze plating bath generally adopts prussiate and oxyhydroxide to make complexing agent, copper becomes copper cyano complex with mono-valent form with cyanide complex, tin is with tetravalent form and sodium hydroxide complexing, therefore bath stability, dispersing property is good, and attended operation is convenient, tinbronze coating uniform and delicate, composition and color and luster easily control.But the hypertoxic prussiate containing high level in plating solution, produces hypertoxic gas in plating, serious to human injury, also serious environment pollution simultaneously, and wastewater treatment requires strict, and by environmental administration's keeping under strict supervision close inspection, therefore its application is subject to a definite limitation.
At present, at steel-iron components electroplating surface tinbronze, sign and require to adopt cyanideless electro-plating in environmental protection restriction.But cyanideless electro-plating tinbronze greatest problem combines loosely between coating and matrix, because the standard potential φ ° (Fe of iron (Fe)
3+/ Fe) be-0.44V, and the standard potential φ ° (Cu of copper (Cu)
3+/ Cu) be+0.34V, both differ greatly, therefore when steel part enters in pyrophosphate salt system or sulfate system plating solution, replacement(metathesis)reaction is there is in copper on steel part surface, and the copper powder of displacement is loose, loose displacement copper carries out the coating of galvanic deposit gained and basal body binding force loosely.Have the technology of first nickel plating bottoming then tinning bronze in steel part at present, but with nickel bottoming exist bottoming success ratio low, reprocess problem not easily, once needs are reprocessed, the nickel on matrix not easily takes off and causes and cannot reprocess.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide a kind of tinbronze coating and steel substrate to bond firmly cyanideless electro-plating tinbronze electroplate liquid and preparation method thereof.
The object of the present invention is achieved like this:
A kind of steel part cyanideless electro-plating tinbronze electroplate liquid, component comprises: Cu
2+12 ~ 17g/L, potassium pyrophosphate 240 ~ 280g/L, Sn
2+1.5 ~ 2.5g/L, Sodium phosphate dibasic or dipotassium hydrogen phosphate 30 ~ 50g/L, citric acid receive 5 ~ 10g/L, nitrilotriacetic acid(NTA) 30 ~ 40g/L, and pH value is 8.3 ~ 8.8.
Described Cu
2+derive from cupric pyrophosphate, described Sn
2+derive from stannous pyrophosphate.
As preferably, the component of described steel part cyanideless electro-plating tinbronze electroplate liquid comprises: Cu
2+13 ~ 16g/L, potassium pyrophosphate 250 ~ 270g/L, Sn
2+1.6 ~ 2.4g/L, Sodium phosphate dibasic or dipotassium hydrogen phosphate 35 ~ 45g/L, citric acid receive 6 ~ 9g/L, nitrilotriacetic acid(NTA) 32 ~ 38g/L.
Described steel part cyanideless electro-plating tinbronze electroplate liquid adopts deionized water preparation.
The working conditions of described steel part cyanideless electro-plating tinbronze electroplate liquid is: temperature is 25 ~ 35 DEG C, cathode current density is 0.5 ~ 2A/dm
2, electroplating time is 80 ~ 90 minutes.
A preparation method for steel part cyanideless electro-plating tinbronze electroplate liquid, comprises the steps:
1) Sodium phosphate dibasic of potassium pyrophosphate and half amount or dipotassium hydrogen phosphate are dissolved in hot water;
2) cupric pyrophosphate is dissolved in step 1) solution in;
3) nitrilotriacetic acid(NTA) is added in suitable quantity of water, stir while slowly add sodium hydroxide until nitrilotriacetic acid(NTA) all dissolves, solution is added step 2) mixed solution in, then add in mixed solution second half amount Sodium phosphate dibasic or dipotassium hydrogen phosphate;
4) adjust pH value to 8.3 ~ 8.8 of solution, filter plating solution;
5) by step 4) gained plating solution at small area analysis 0.1 ~ 0.2A, under 25 ~ 35 DEG C of conditions, with fine copper plate for anode, take waste steel plate as negative electrode, form electrolyzer electrolysis treatment 3-4 hour; Make it all dissolve when keeping electrolysis while add stannous pyrophosphate when stirring plating solution after electrolysis 3-4 hour, continue electrolysis 3-4 hour, to obtain final product.
Described step 1) in the temperature of hot water be 30 ~ 35 DEG C.
Described step 4) in by the pH value of potassium pyrophosphate or sodium hydroxide or potassium hydroxide or nitrilotriacetic acid(NTA) adjustment solution.
The invention has the beneficial effects as follows: steel part cyanideless electro-plating tinbronze electroplate liquid of the present invention, support the use with ultralow density cupric pyrophosphate copper pre-plating tank liquor, first carry out copper pre-plating bottoming process, formally electroplate with electroplate liquid of the present invention again, prevent steel part from entering in pyrophosphate salt system plating solution and produce copper displacement, improve the bonding force of coating and steel substrate, make tinbronze coating and steel substrate cohesive strength good, solve coating in prior art and be combined problem loosely with matrix.Adopt electroplate liquid of the present invention, high current can be reached during plating, the position such as internal surface, corner angle, concave surface hole of steel part evenly can plate tinbronze, electroplating effect is excellent, thickness of coating can reach 10-15um, coating evenly, fine and close, outward appearance is good, and this electroplate liquid cost is low, preparation method is simple, applicability is wide.When preparing this electroplate liquid, first small area analysis electrolysis treatment a few hours, effectively can remove the impurity in plating solution, then stir plating solution when continuing electrolysis and add stannous pyrophosphate and make it all dissolve, avoid stannic generation, make electroplating effect excellent.
Embodiment
Embodiment 1 prepares ultralow density cupric pyrophosphate copper pre-plating tank liquor
Electroplate liquid--the ultralow density cupric pyrophosphate copper pre-plating tank liquor of preparation steel part copper pre-plating process, compound method is as follows:
Added by potassium pyrophosphate in a small amount of deionized water, limit edged stirs fully to dissolve, and then adds cupric pyrophosphate, trolamine, adds deionized water to normality after stirring.Each compound proportioning is: cupric pyrophosphate (Cu
2p
2o
7, technical pure): (1.5 ~ 2.5) g/L; Potassium pyrophosphate (K
4p
2o
7, technical pure): (200 ~ 250) g/L; Trolamine (technical pure): (5 ~ 10) g/L;
Embodiment 2 prepares steel part cyanideless electro-plating tinbronze electroplate liquid
The electroplate liquid of cyanideless electro-plating tinbronze after preparation pre-treatment, this steel part cyanideless electro-plating tinbronze plating solution formula is:
Cu
2+(derive from cupric pyrophosphate Cu
2p
2o
7, technical pure): (12 ~ 17) g/L;
Potassium pyrophosphate (K
4p
2o
7, technical pure): (240 ~ 280) g/L;
Sn
2+(derive from stannous pyrophosphate Sn
2p
2o
7, technical pure): (1.5 ~ 2.5) g/L;
Sodium phosphate dibasic (Na
2hPO
4, technical pure): (30 ~ 50) g/L;
Citric acid is received (Na
3c
6h
5o
7, technical pure): (5 ~ 10) g/L;
Nitrilotriacetic acid(NTA) (technical pure): (30 ~ 40) g/L;
Preparation operates in accordance with the following steps:
1) Sodium phosphate dibasic of the potassium pyrophosphate of calculated amount and half amount or dipotassium hydrogen phosphate are dissolved in the hot water of 30 ~ 35 DEG C;
2) under agitation cupric pyrophosphate is dissolved in step 1) solution in;
3) nitrilotriacetic acid(NTA) is added in suitable quantity of water, stir while slowly add sodium hydroxide until nitrilotriacetic acid(NTA) all dissolves (can survey pH value and slowly add sodium hydroxide therebetween, when pH value is about 7.0, nitrilotriacetic acid(NTA) all dissolves), solution is added step 2) mixed solution in, then add in mixed solution second half amount Sodium phosphate dibasic or dipotassium hydrogen phosphate;
4) according to step 3) pH value of gained solution, with pH value to 8.3 ~ 8.8 of potassium pyrophosphate or sodium hydroxide or potassium hydroxide or nitrilotriacetic acid(NTA) adjustment solution, and filter plating solution;
5) by step 4) gained filters plating solution at small area analysis 0.1 ~ 0.2A, under 25 ~ 35 DEG C of conditions, with fine copper plate for anode, take waste steel plate as negative electrode, and formation electrolyzer electrolysis treatment 3-4 hour, can remove the impurity in plating solution effectively; Make it dissolve when keeping electrolysis while add stannous pyrophosphate when stirring plating solution after electrolysis 3-4 hour, continue electrolysis 3-4 hour, can effectively avoid stannic generation, ensure the effect of electroplate liquid;
6) analysis and regulation examination plating.
Embodiment 3 steel part cyanideless electro-plating tinbronze
Choose sample: get 10# steel thin slice and do test piece 1, specification is 120mm (length) × 60mm (wide) × 3 ~ 5mm (thick), two plane grinding processing, roughness Ra≤0.8um.
One, cyanideless electro-plating tinbronze is carried out to test piece 1, operates in accordance with the following steps:
1, test piece 1 is carried out oil removing, is cleaned up, operate in accordance with the following steps:
Dry after the organic solvents such as a, employing gasoline clean the full surface and oil contaminant of test piece 1.
B, test piece 1 adopt the wiping oil removing after 3 minutes of special-purpose metal degreasing powder aqueous solution soaking, the cleaning of flowing tap water.
C, test piece 1 is immersed in the aqueous hydrochloric acid of 8%, pickling 5 minutes, the cleaning of flowing tap water.
D, test piece 1 is immersed in the aqueous sulfuric acid of 5%, activation treatment 5 minutes, the cleaning of flowing tap water.
2, copper pre-plating process: the test piece 1 cleaned up inserted as negative electrode in ultralow density cupric pyrophosphate copper pre-plating tank liquor, using fine copper plate as anode, anticathode is electroplated:
1., prepare ultralow density cupric pyrophosphate copper pre-plating tank liquor, its component is:
Cupric pyrophosphate (Cu
2p
2o
7): 1.5g/L;
Potassium pyrophosphate (K
4p
2o
7): 200g/L;
Trolamine: 5g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned ultralow density cupric pyrophosphate copper pre-plating tank liquor to the process of test piece 1 copper pre-plating, plating working conditions is:
I, plating solution working temperature: 18 DEG C;
II, annode area: cathode area ≈ 2:1;
III, cathode current density: 4A/dm
2;
IV, test piece 1 cathodic current: 6A;
V, the copper pre-plating bottoming time: 3 minutes;
VI, electroplating power supply: 50A/12V silicon-controlled rectifier.
3, test piece 1 is taken out from copper pre-plating groove flowing tap water cleaning 1 ~ 2 time.
4, insert the test piece 1 after cleaning as negative electrode in cyanideless electro-plating tinbronze electroplate liquid, using fine copper plate as anode, anticathode is electroplated:
1., prepare pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid, its component is:
Cupric ion (Cu
2+): 13g/L; Potassium pyrophosphate (K
4p
2o
7): 245g/L;
Tin ion (Sn
2+): 1.7g/L; Sodium phosphate dibasic (Na
2hPO
4): 35g/L;
Trisodium citrate (Na
3c
6h
5o
7): 6g/L; Nitrilotriacetic acid(NTA): 32g/L;
Wherein cupric ion (Cu
2+) by cupric pyrophosphate (Cu
2p
2o
7) hydrolysis provide, tin ion (Sn
2+) by stannous pyrophosphate (Sn
2p
2o
7) hydrolysis provide.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid electroplate test piece 1, operational condition is:
I, bath pH value: 8.4;
II, plating solution working temperature: 25 DEG C;
III, annode area: cathode area ≈ 2:1;
IV, cathode current density: 0.8A/dm
2;
V, test piece 1 cathodic current: 1.2A;
VI, the test piece 1 eleetrotinplate bronze time: 90 minutes;
VII, electroplating power supply: 50A/12V tri-sections of timing silicon-controlled rectifiers.
After having electroplated, test piece 1 is taken out from eleetrotinplate bronze groove, dry after flowing tap water cleans up.Two, electroplating effect checking
Test piece 1 adopts the compliance test result of the rear coating of the inventive method eleetrotinplate bronze plating:
1., test piece 1 liang of plane tinbronze coating is even, fine and close, and color is golden yellow.
2., test piece 1 one plane tinbronze thickness of coating is 0.0105mm, and another plane tinbronze thickness of coating is 0.011mm.
3., to test piece 1 liang of plane tinbronze coating adopting GB5270-2005 standard to draw, lattice are sticky draws detection, have no tinbronze coating and come off, show that between coating and matrix, bonding force is good.
4., to test piece 1 liang of plane tinbronze coating adopt the curved disconnected detection of GB5270-2005 standard, have no test piece 1 excurvation plane tinbronze craze of coating or come off, show that between coating and matrix, bonding force is excellent.
Embodiment 4 steel part cyanideless electro-plating tinbronze
One, still with the test piece 1 in embodiment 3 for sample, operate in accordance with the following steps and cyanideless electro-plating tinbronze carried out to test piece 1:
1, test piece 1 is carried out to oil removing, cleaned up, purging method is identical with purging method in embodiment 3.
2, copper pre-plating process: the test piece 1 cleaned up inserted as negative electrode in ultralow density cupric pyrophosphate copper pre-plating tank liquor, using fine copper plate as anode, anticathode is electroplated:
1., prepare ultralow density cupric pyrophosphate copper pre-plating tank liquor, its component is:
Cupric pyrophosphate (Cu
2p
2o
7): 2g/L;
Potassium pyrophosphate (K
4p
2o
7): 215g/L;
Trolamine: 7.5g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned ultralow density cupric pyrophosphate copper pre-plating tank liquor to the process of test piece 1 copper pre-plating, plating working conditions is:
I, plating solution working temperature: 18 DEG C;
II, annode area: cathode area ≈ 2:1;
III, cathode current density: 3A/dm
2;
IV, test piece 1 cathodic current: 4.5A;
V, the copper pre-plating bottoming time: 2 minutes;
VI, electroplating power supply: 50A/12V silicon-controlled rectifier.
3, test piece 1 is taken out from copper pre-plating groove flowing tap water cleaning 1 ~ 2 time.
4, insert the test piece 1 after cleaning as negative electrode in cyanideless electro-plating tinbronze electroplate liquid, using fine copper plate as anode, anticathode is electroplated:
1., prepare pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid, its component is:
Cupric ion (Cu
2+): 13.5g/L; Potassium pyrophosphate (K
4p
2o
7): 255g/L;
Tin ion (Sn
2+): 1.75g/L; Sodium phosphate dibasic (Na
2hPO
4): 38g/L;
Trisodium citrate (Na
3c
6h
5o
7): 7g/L; Nitrilotriacetic acid(NTA): 32.5g/L;
Wherein cupric ion (Cu
2+) by cupric pyrophosphate (Cu
2p
2o
7) hydrolysis provide, tin ion (Sn
2+) by stannous pyrophosphate (Sn
2p
2o
7) hydrolysis provide.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid electroplate test piece 1, operational condition is:
I, bath pH value: 8.6;
II, plating solution working temperature: 28 DEG C;
III, annode area: cathode area ≈ 2:1;
IV, cathode current density: 1A/dm
2;
V, test piece 1 cathodic current: 1.5A;
VI, the test piece 1 eleetrotinplate bronze time: 90 minutes;
VII, electroplating power supply: 50A/12V tri-sections of timing silicon-controlled rectifiers.
After having electroplated, test piece 1 is taken out from eleetrotinplate bronze groove, dry after flowing tap water cleans up.
Two, electroplating effect checking
Test piece 1 adopts the compliance test result of the rear coating of the inventive method eleetrotinplate bronze plating:
1., test piece 1 liang of plane tinbronze coating is even, fine and close, and color is golden yellow.
2., test piece 1 one plane tinbronze thickness of coating is 0.0115mm, and another plane tinbronze thickness of coating is 0.012mm.
3., to test piece 1 liang of plane tinbronze coating adopting GB5270-2005 standard to draw, lattice are sticky draws detection, have no tinbronze coating and come off, show that between coating and matrix, bonding force is good.
4., to test piece 1 liang of plane tinbronze coating adopt the curved disconnected detection of GB5270-2005 standard, have no test piece 1 excurvation plane tinbronze craze of coating or come off, show that between coating and matrix, bonding force is excellent.
Embodiment 5 steel part cyanideless electro-plating tinbronze
One, still with the test piece 1 in embodiment 3 for sample, operate in accordance with the following steps and cyanideless electro-plating tinbronze carried out to test piece 1:
1, test piece 1 is carried out to oil removing, cleaned up, purging method is identical with purging method in embodiment 3.
2, copper pre-plating process: the test piece 1 cleaned up inserted as negative electrode in ultralow density cupric pyrophosphate copper pre-plating tank liquor, using fine copper plate as anode, anticathode is electroplated:
1., prepare ultralow density cupric pyrophosphate copper pre-plating tank liquor, its component is:
Cupric pyrophosphate (Cu
2p
2o
7): 2.2g/L;
Potassium pyrophosphate (K
4p
2o
7): 235g/L;
Trolamine: 8g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned ultralow density cupric pyrophosphate copper pre-plating tank liquor to the process of test piece 1 copper pre-plating, plating working conditions is:
I, plating solution working temperature: 32 DEG C;
II, annode area: cathode area ≈ 2:1;
III, cathode current density: 2A/dm
2;
IV, test piece 1 cathodic current: 3A;
V, the copper pre-plating bottoming time: 2 minutes;
VI, electroplating power supply: 50A/12V silicon-controlled rectifier.
3, test piece 1 is taken out from copper pre-plating groove flowing tap water cleaning 1 ~ 2 time.
4, insert the test piece 1 after cleaning as negative electrode in cyanideless electro-plating tinbronze electroplate liquid, using fine copper plate as anode, anticathode is electroplated:
1., prepare pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid, its component is:
Cupric ion (Cu
2+): 15.5g/L; Potassium pyrophosphate (K
4p
2o
7): 270g/L;
Tin ion (Sn
2+): 2.25g/L; Dipotassium hydrogen phosphate (K
2hPO
4): 43g/L;
Trisodium citrate (Na
3c
6h
5o
7): 8.5g/L; Nitrilotriacetic acid(NTA): 35g/L;
Wherein cupric ion (Cu
2+) by cupric pyrophosphate (Cu
2p
2o
7) hydrolysis provide, tin ion (Sn
2+) by stannous pyrophosphate (Sn
2p
2o
7) hydrolysis provide.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid electroplate test piece 1, operational condition is:
I, bath pH value: 8.6;
II, plating solution working temperature: 30 DEG C;
III, annode area: cathode area ≈ 2:1;
IV, cathode current density: 1.5A/dm
2;
V, test piece 1 cathodic current: 2.3A;
VI, the test piece 1 eleetrotinplate bronze time: 85 minutes;
VII, electroplating power supply: 50A/12V tri-sections of timing silicon-controlled rectifiers.
After having electroplated, test piece 1 is taken out from eleetrotinplate bronze groove, dry after flowing tap water cleans up.Two, electroplating effect checking
Test piece 1 adopts the compliance test result of the rear coating of the inventive method eleetrotinplate bronze plating:
1., test piece 1 liang of plane tinbronze coating is even, fine and close, and color is golden yellow.
2., test piece 1 one plane tinbronze thickness of coating is 0.0125mm, and another plane tinbronze thickness of coating is 0.013mm.
3., to test piece 1 liang of plane tinbronze coating adopting GB5270-2005 standard to draw, lattice are sticky draws detection, have no tinbronze coating and come off, show that between coating and matrix, bonding force is good.
4., to test piece 1 liang of plane tinbronze coating adopt the curved disconnected detection of GB5270-2005 standard, have no test piece 1 excurvation plane tinbronze craze of coating or come off, show that between coating and matrix, bonding force is excellent.
Embodiment 6 steel part cyanideless electro-plating tinbronze
One, still with the test piece 1 in embodiment 3 for sample, operate in accordance with the following steps and cyanideless electro-plating tinbronze carried out to test piece 1:
1, test piece 1 is carried out to oil removing, cleaned up, purging method is identical with purging method in embodiment 3.
2, copper pre-plating process: the test piece 1 cleaned up inserted as negative electrode in ultralow density cupric pyrophosphate copper pre-plating tank liquor, using fine copper plate as anode, anticathode is electroplated:
1., prepare ultralow density cupric pyrophosphate copper pre-plating tank liquor, its component is:
Cupric pyrophosphate (Cu
2p
2o
7): 2.5g/L;
Potassium pyrophosphate (K
4p
2o
7): 250g/L;
Trolamine: 10g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned ultralow density cupric pyrophosphate copper pre-plating tank liquor to the process of test piece 1 copper pre-plating, plating working conditions is:
I, plating solution working temperature: 45 DEG C;
II, annode area: cathode area ≈ 2:1;
III, cathode current density: 1A/dm
2;
IV, test piece 1 cathodic current: 1.5A;
V, the copper pre-plating bottoming time: 3 minutes;
VI, electroplating power supply: 50A/12V silicon-controlled rectifier.
3, test piece 1 is taken out from copper pre-plating groove flowing tap water cleaning 1 ~ 2 time.
4, insert the test piece 1 after cleaning as negative electrode in cyanideless electro-plating tinbronze electroplate liquid, using fine copper plate as anode, anticathode is electroplated:
1., prepare pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid, its component is:
Cupric ion (Cu
2+): 17g/L; Potassium pyrophosphate (K
4p
2o
7): 280g/L;
Tin ion (Sn
2+): 2.5g/L; Dipotassium hydrogen phosphate (K
2hPO
4): 50g/L;
Trisodium citrate (Na
3c
6h
5o
7): 10g/L; Nitrilotriacetic acid(NTA): 40g/L;
Wherein cupric ion (Cu
2+) by cupric pyrophosphate (Cu
2p
2o
7) hydrolysis provide, tin ion (Sn
2+) by stannous pyrophosphate (Sn
2p
2o
7) hydrolysis provide.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate salt cyanideless electro-plating tinbronze electroplate liquid electroplate test piece 1, operational condition is:
I, bath pH value: 8.8;
II, plating solution working temperature: 35 DEG C;
III, annode area: cathode area ≈ 2:1;
IV, cathode current density: 2A/dm
2;
V, test piece 1 cathodic current: 3.0A;
VI, the test piece 1 eleetrotinplate bronze time: 80 minutes;
VII, electroplating power supply: 50A/12V tri-sections of timing silicon-controlled rectifiers.
After having electroplated, test piece 1 is taken out from eleetrotinplate bronze groove, dry after flowing tap water cleans up.Two, electroplating effect checking
Test piece 1 adopts the compliance test result of the rear coating of the inventive method eleetrotinplate bronze plating:
1., test piece 1 liang of plane tinbronze coating is even, fine and close, and color is golden yellow.
2., test piece 1 one plane tinbronze thickness of coating is 0.0115mm, and another plane tinbronze thickness of coating is 0.0125mm.
3., to test piece 1 liang of plane tinbronze coating adopting GB5270-2005 standard to draw, lattice are sticky draws detection, have no tinbronze coating and come off, show that between coating and matrix, bonding force is good.
4., to test piece 1 liang of plane tinbronze coating adopt the curved disconnected detection of GB5270-2005 standard, have no test piece 1 excurvation plane tinbronze craze of coating or come off, show that between coating and matrix, bonding force is excellent.
Claims (7)
1. a steel part cyanideless electro-plating tinbronze electroplate liquid, it is characterized in that, component comprises: Cu
2+12 ~ 17g/L, potassium pyrophosphate 240 ~ 280g/L, Sn
2+1.5 ~ 2.5g/L, Sodium phosphate dibasic or dipotassium hydrogen phosphate 30 ~ 50g/L, citric acid receive 5 ~ 10g/L, nitrilotriacetic acid(NTA) 30 ~ 40g/L, and pH value is 8.3 ~ 8.8.
2. steel part cyanideless electro-plating tinbronze electroplate liquid according to claim 1, is characterized in that, described Cu
2+derive from cupric pyrophosphate, described Sn
2+derive from stannous pyrophosphate.
3. steel part cyanideless electro-plating tinbronze electroplate liquid according to claim 1, is characterized in that, the component of described steel part cyanideless electro-plating tinbronze electroplate liquid comprises: Cu
2+13 ~ 16g/L, potassium pyrophosphate 250 ~ 270g/L, Sn
2+1.6 ~ 2.4g/L, Sodium phosphate dibasic or dipotassium hydrogen phosphate 35 ~ 45g/L, citric acid receive 6 ~ 9g/L, nitrilotriacetic acid(NTA) 32 ~ 38g/L, and pH value is 8.3 ~ 8.8.
4. the steel part cyanideless electro-plating tinbronze electroplate liquid according to any one of claim 1-3, is characterized in that, described steel part cyanideless electro-plating tinbronze electroplate liquid adopts deionized water preparation.
5. a preparation method for steel part cyanideless electro-plating tinbronze electroplate liquid, is characterized in that, comprise the steps:
1) Sodium phosphate dibasic of potassium pyrophosphate and half amount or dipotassium hydrogen phosphate are dissolved in hot water;
2) cupric pyrophosphate is dissolved in step 1) solution in;
3) nitrilotriacetic acid(NTA) is added in suitable quantity of water, stir while slowly add sodium hydroxide until nitrilotriacetic acid(NTA) all dissolves, solution is added step 2) mixed solution in, then add in mixed solution second half amount Sodium phosphate dibasic or dipotassium hydrogen phosphate;
4) adjust pH value to 8.3 ~ 8.8 of solution, filter plating solution;
5) by step 4) gained plating solution at small area analysis 0.1 ~ 0.2A, under 25 ~ 35 DEG C of conditions, with fine copper plate for anode, take waste steel plate as negative electrode, form electrolyzer electrolysis treatment 3-4 hour; Make it all dissolve when keeping electrolysis while add stannous pyrophosphate when stirring plating solution after electrolysis 3-4 hour, continue electrolysis 3-4 hour, to obtain final product.
6. the preparation method of a kind of steel part cyanideless electro-plating tinbronze electroplate liquid according to claim 5, is characterized in that, described step 1) in the temperature of hot water be 30 ~ 35 DEG C.
7. the preparation method of a kind of steel part cyanideless electro-plating tinbronze electroplate liquid according to claim 5, is characterized in that, described step 4) in by the pH value of potassium pyrophosphate or sodium hydroxide or potassium hydroxide or nitrilotriacetic acid(NTA) adjustment solution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630240A (en) * | 2017-10-30 | 2018-01-26 | 湖南金泰检测检验有限公司 | Electroplate liquid of steel and iron parts cyanideless electro-plating tin bronze and preparation method thereof and electro-plating method |
| CN110528032A (en) * | 2019-10-09 | 2019-12-03 | 范成勇 | A kind of steel and iron parts cyanideless electro-plating tin bronze electroplate liquid that plating layer porosity is low |
| CN110923756A (en) * | 2019-12-30 | 2020-03-27 | 广东超导电子有限公司 | Cyanide-free electroplating tin solution and electroplating method thereof |
| CN114908388A (en) * | 2022-05-18 | 2022-08-16 | 湖南科技大学 | Cu-Sn-based alloy plating layer and preparation method thereof |
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| CN101665962A (en) * | 2009-09-04 | 2010-03-10 | 厦门大学 | Alkaline non-cyanide plating solution for copper-plating used on iron and steel base and preparation method thereof |
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| CN101665962A (en) * | 2009-09-04 | 2010-03-10 | 厦门大学 | Alkaline non-cyanide plating solution for copper-plating used on iron and steel base and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630240A (en) * | 2017-10-30 | 2018-01-26 | 湖南金泰检测检验有限公司 | Electroplate liquid of steel and iron parts cyanideless electro-plating tin bronze and preparation method thereof and electro-plating method |
| CN107630240B (en) * | 2017-10-30 | 2019-03-15 | 湖南金泰检测检验有限公司 | Electroplate liquid of steel and iron parts cyanideless electro-plating tin bronze and preparation method thereof and electro-plating method |
| CN110528032A (en) * | 2019-10-09 | 2019-12-03 | 范成勇 | A kind of steel and iron parts cyanideless electro-plating tin bronze electroplate liquid that plating layer porosity is low |
| CN110923756A (en) * | 2019-12-30 | 2020-03-27 | 广东超导电子有限公司 | Cyanide-free electroplating tin solution and electroplating method thereof |
| CN114908388A (en) * | 2022-05-18 | 2022-08-16 | 湖南科技大学 | Cu-Sn-based alloy plating layer and preparation method thereof |
| CN114908388B (en) * | 2022-05-18 | 2024-02-02 | 湖南科技大学 | Cu-Sn-based alloy coating and preparation method thereof |
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