CN104928734B - The method of steel and iron parts cyanideless electro-plating tin bronze - Google Patents
The method of steel and iron parts cyanideless electro-plating tin bronze Download PDFInfo
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- CN104928734B CN104928734B CN201510387076.9A CN201510387076A CN104928734B CN 104928734 B CN104928734 B CN 104928734B CN 201510387076 A CN201510387076 A CN 201510387076A CN 104928734 B CN104928734 B CN 104928734B
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Abstract
The invention discloses a kind of method of steel and iron parts cyanideless electro-plating tin bronze, comprise the following steps：1) steel and iron parts are cleaned；2) steel and iron parts are inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor and makees anode as negative electrode, fine copper plate, electroplated；Copper pre-plating tank liquor formula is：1.5~2.5g/L of cupric pyrophosphate, 200~250g/L of potassium pyrophosphate, 5~10g/L of triethanolamine；3) rinse；4) steel and iron parts are inserted in cyanideless electro-plating tin bronze electroplate liquid and makees anode as negative electrode, fine copper plate, electroplated, plating solution formula is：Cu2+12~17g/L, 240~280g/L of potassium pyrophosphate, Sn2+30~50g/L of 1.5~2.5g/L, disodium hydrogen phosphate or dipotassium hydrogen phosphate, citric acid receive 5~10g/L, 30~40g/L of nitrilotriacetic acid.This method technique is simple, cost is low, application is wide.
Description
Technical field
The present invention relates to a kind of electroplating technology, and in particular to a kind of method of steel and iron parts cyanideless electro-plating tin bronze.
Background technology
Signal bronze is commonly called as tin bronze, and electrotinning bronze plating is widely used in light industry, instrument, machinery, communication, household electric
The industrial departments such as device, handicraft, it is the alloy plating that China is most widely used, production scale is maximum.
For a long time, electrotinning bronze plating bath typically makees complexing agent using cyanide and hydroxide, and copper is with mono-valent form
With cyanide complex into copper cyano complex, tin is complexed with tetravalent form and sodium hydroxide, therefore bath stability, and dispersive property is good, dimension
Protect easy to operate, tin bronze coating uniform and delicate, composition and color and luster are easily controlled.But the hypertoxic cyanogen containing high level in plating solution
Compound, while hypertoxic gas is produced in electroplating, it is serious to human injury, environment is also seriously polluted, and wastewater treatment requirement is tight
Lattice, by environmental administration's keeping under strict supervision close inspection, therefore its application is by a definite limitation.
At present, in steel-iron components electroplating surface tin bronze, sign and require to use cyanideless electro-plating in environmental protection limitation.But cyanideless electro-plating
Tin bronze greatest problem is to be combined between coating and matrix loosely, because φ ° of (Fe of standard electrode potential of iron (Fe)3+/ Fe) for-
0.44V, and φ ° of (Cu of standard electrode potential of copper (Cu)3+/ Cu) it is+0.34V, both differ greatly, therefore when steel and iron parts enter
When in pyrophosphate system or sulfate system plating solution, displacement reaction occurs on steel and iron parts surface for copper, and the copper powder replaced is thin
Pine, coating and basal body binding force on loose displacement copper obtained by progress electro-deposition are loosely.Have at present first in steel and iron parts
The technology of nickel plating bottoming and then tinning bronze, but have that bottoming success rate is low, reprocesses the problem of being not easy with nickel bottoming, once need
Reprocess, the nickel on matrix is not easy to take off and cause to reprocess.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, there is provided a kind of tin bronze coating is firmly bonded with steel substrate
Cyanideless electro-plating tin bronze method.
The object of the present invention is achieved like this：A kind of method of steel and iron parts cyanideless electro-plating tin bronze, comprises the following steps：
1) first by steel and iron parts oil removing, clean up；
2) preplating Copper treatment：The steel and iron parts cleaned up are inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as the moon
Pole, using fine copper plate as anode, negative electrode is electroplated；The super low concentration cupric pyrophosphate copper pre-plating tank liquor formula is：Burnt phosphorus
Sour 1.5~2.5g/L of copper, 200~250g/L of potassium pyrophosphate, 5~10g/L of triethanolamine；
3) steel and iron parts after preplating Copper treatment are taken out, rinsed；
4) cyanideless electro-plating tin bronze：Using step 3) rinse after steel and iron parts insertion cyanideless electro-plating tin bronze electroplate liquid in as
Negative electrode, using fine copper plate as anode, negative electrode is electroplated；The cyanideless electro-plating tin bronze plating solution formula is：Cu2+12~
17g/L, 240~280g/L of potassium pyrophosphate, Sn2+30~50g/L of 1.5~2.5g/L, disodium hydrogen phosphate or dipotassium hydrogen phosphate, lemon
Acid receives 5~10g/L, 30~40g/L of nitrilotriacetic acid, pH value 8.3~8.8.
Steel and iron parts oil removing described in step 1), cleaning method comprise the following steps：
A, dried after cleaning steel and iron parts surface and oil contaminant with organic solvent；
B, soaked using metal degreasing amidin and clean steel and iron parts；
Steel and iron parts are immersed to pickling in 8% aqueous hydrochloric acid solution, rinse c,；
D, steel and iron parts are immersed in 5% aqueous sulfuric acid and activated, rinsed.
Preferably, the copper pre-plating of super low concentration cupric pyrophosphate described in step 2) tank liquor formula is：Cupric pyrophosphate 1.8~
2.2g/L, 210~240g/L of potassium pyrophosphate, 6~9g/L of triethanolamine；
The plating condition of work of preplating Copper treatment is in step 2)：Temperature be 15~45 DEG C, cathode-current density be 1~
4A/dm2Under conditions of plating is carried out 1~3 minute to negative electrode.
Cu described in cyanideless electro-plating tin bronze electroplate liquid in step 4)2+From cupric pyrophosphate, the Sn2+From Jiao
Phosphoric acid stannous chloride.
Preferably, the plating solution formula of cyanideless electro-plating tin bronze described in step 4) is：Cu2+13~16g/L, pyrophosphoric acid
250~270g/L of potassium, Sn2+35~45g/L of 1.6~2.4g/L, disodium hydrogen phosphate or dipotassium hydrogen phosphate, citric acid receive 6~9g/L,
Nitrilotriacetic acid 32~38g/L, the Cu2+From cupric pyrophosphate, the Sn2+From stannous pyrophosphate.
It is to the condition of work of steel and iron parts progress cyanideless electro-plating tin bronze in step 4)：It is 25~35 DEG C, negative electrode in temperature
Current density is 0.5~2A/dm2Under conditions of plating is carried out 80~90 minutes to negative electrode.
The electricity of cyanideless electro-plating tin bronze described in the copper pre-plating of super low concentration cupric pyrophosphate described in step 2) tank liquor and step 4)
Plating solution is prepared using deionized water.
The beneficial effects of the invention are as follows：Preplating is carried out to steel and iron parts to be plated using super low concentration cupric pyrophosphate copper pre-plating tank liquor
Copper bottoming handle, when preventing from formally electroplating steel and iron parts enter pyrophosphate system plating solution in produce copper displacement, improve coating with
The adhesion of steel substrate so that tin bronze coating is good with steel substrate adhesion strength, solves coating in the prior art and base
The problem of body combines loosely.It can reach high current, the inner surface of steel and iron parts, corner angle, concave surface hole using this method, during plating
Can uniformly plate tin bronze Deng position, electroplating effect is excellent, and thickness of coating can reach 10-15um, coating uniformly, it is fine and close,
Outward appearance is good.This method technique is simple, cost is low, application is wide.
Embodiment
Embodiment 1 prepares super low concentration cupric pyrophosphate copper pre-plating tank liquor
Prepare steel and iron parts preplating Copper treatment electroplate liquid -- super low concentration cupric pyrophosphate copper pre-plating tank liquor, compound method is such as
Under：
Potassium pyrophosphate is added in a small amount of deionized water, it is stirring while adding fully to dissolve, then add cupric pyrophosphate, three
Monoethanolamine, deionized water is stirring evenly and then adding into normal concentration.Each compound matches：Cupric pyrophosphate (Cu2P2O7, industry
It is pure)：(1.5~2.5) g/L；Potassium pyrophosphate (K4P2O7, technical pure)：(200~250) g/L；Triethanolamine (technical pure)：(5~
10)g/L；
Embodiment 2 prepares cyanideless electro-plating tin bronze electroplate liquid
The electroplate liquid of cyanideless electro-plating tin bronze after pre-processing is prepared, plating solution formula is：
Cu2+(derive from cupric pyrophosphate Cu2P2O7, technical pure)：(12~17) g/L；
Potassium pyrophosphate (K4P2O7, technical pure)：(240~280) g/L；
Sn2+(derive from stannous pyrophosphate Sn2P2O7, technical pure)：(1.5~2.5) g/L；
Disodium hydrogen phosphate (Na2HPO4, technical pure) or dipotassium hydrogen phosphate (K2HPO4, technical pure)：(30~50) g/L；
Citric acid receives (Na3C6H5O7, technical pure)：(5~10) g/L；
Nitrilotriacetic acid (technical pure)：(30~40) g/L；
Preparation operates in accordance with the following steps：
1) disodium hydrogen phosphate or dipotassium hydrogen phosphate of the potassium pyrophosphate of amount of calculation and half amount are dissolved in 30~35 DEG C
In hot water；
2) cupric pyrophosphate is dissolved in the solution of step 1) under agitation；
3) nitrilotriacetic acid is added in suitable quantity of water, stirred while being slowly hydrogenated with sodium oxide molybdena until nitrilotriacetic acid is all molten
Solution (can survey pH value to be slowly added to sodium hydroxide, nitrilotriacetic acid all dissolves when pH value is about 7.0) therebetween, and solution is added and walked
In rapid mixed liquor 2), the disodium hydrogen phosphate or dipotassium hydrogen phosphate of second half amount are then added in mixed liquor；
4) with potassium pyrophosphate or sodium hydroxide either the pH value of potassium hydroxide or nitrilotriacetic acid adjustment solution to 8.3~
8.8, and filter plating solution；
5) by plating solution obtained by step 4) under the conditions of 0.1~0.2A of low current, 25~35 DEG C, using fine copper plate as anode, with
Waste steel plate is negative electrode, forms electrolytic cell electrolysis processing 3-4 hours, can effectively remove the impurity in plating solution；It is electrolysed 3-4 hours
Afterwards keep electrolysis on one side in the case of stir plating solution addition stannous pyrophosphate make its dissolving, continue electrolysis 3-4 hours, can
Effectively to avoid stannic generation, ensure the effect of electroplate liquid；
6) analysis and regulation examination plating.
The steel and iron parts cyanideless electro-plating tin bronze of embodiment 3
Choose sample：10# steel thin slices are taken to make test piece 1, specification is 120mm (length) × 60mm (width) × 3~5mm (thickness), two
Flat surface grinding is processed, roughness Ra≤0.8um.
First, cyanideless electro-plating tin bronze is carried out to test piece 1, operated in accordance with the following steps：
1st, oil removing is carried out to test piece 1, is cleaned up, is operated in accordance with the following steps：
A, dried after cleaning 1 full surface and oil contaminant of test piece using organic solvents such as gasoline.
B, test piece 1 wipes oil removing, flowing running water cleaning using special-purpose metal degreasing powder aqueous solution soaking after 3 minutes.
C, test piece 1 is immersed in 8% aqueous hydrochloric acid solution, pickling 5 minutes, flowing running water cleaning.
D, test piece 1 is immersed in 5% aqueous sulfuric acid, activation process 5 minutes, flowing running water cleaning.
2nd, preplating Copper treatment：The test piece 1 cleaned up is inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as the moon
Pole, using fine copper plate as anode, negative electrode is electroplated：
1., prepare super low concentration cupric pyrophosphate copper pre-plating tank liquor, its component is：
Cupric pyrophosphate (Cu2P2O7)：1.5g/L；
Potassium pyrophosphate (K4P2O7)：200g/L；
Triethanolamine：5g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned super low concentration cupric pyrophosphate copper pre-plating tank liquor to the preplating Copper treatment of test piece 1, plating condition of work is：
Ith, plating solution operating temperature：18℃；
IIth, annode area：Cathode area ≈ 2：1；
IIIth, cathode-current density：4A/dm2；
IVth, the cathode current of test piece 1：6A；
Vth, the copper pre-plating bottoming time：3 minutes；
VIth, electroplating power supply：50A/12V silicon controlled rectifier (SCR)s.
The 3rd, test piece 1 is taken out to flowing running water from copper pre-plating groove clean 1~2 time.
4th, the test piece 1 after cleaning is inserted in cyanideless electro-plating tin bronze electroplate liquid as negative electrode, using fine copper plate as anode,
Negative electrode is electroplated：
1., prepare pyrophosphate cyanideless electro-plating tin bronze electroplate liquid, its component is：
Copper ion (Cu2+)：13g/L；Potassium pyrophosphate (K4P2O7)：245g/L；
Tin ion (Sn2+)：1.7g/L；Disodium hydrogen phosphate (Na2HPO4)：35g/L；
Trisodium citrate (Na3C6H5O7)：6g/L；Nitrilotriacetic acid：32g/L；
Wherein copper ion (Cu2+) by cupric pyrophosphate (Cu2P2O7) hydrolysis offer, tin ion (Sn2+) by stannous pyrophosphate
(Sn2P2O7) hydrolysis offer.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate cyanideless electro-plating tin bronze electroplate liquid test piece 1 is electroplated, operating condition is：
Ith, bath pH value：8.4；
IIth, plating solution operating temperature：25℃；
IIIth, annode area：Cathode area ≈ 2：1；
IVth, cathode-current density：0.8A/dm2；
Vth, the cathode current of test piece 1：1.2A；
VIth, the tin bronze time is electroplated in test piece 1：90 minutes；
VIIth, electroplating power supply：Tri- sections of timing silicon controlled rectifier (SCR)s of 50A/12V.
Test piece 1 is taken out from plating tin bronze groove after having electroplated, flowing running water dries after cleaning up.
2nd, electroplating effect is verified
The compliance test result of coating after test piece 1 is electroplated using the inventive method plating tin bronze：
1., 1 liang of plane tin bronze coating of test piece uniformly, it is fine and close, color is golden yellow.
2., the plane tin bronze thickness of coating of test piece 1 one be 0.0105mm, another plane tin bronze thickness of coating is
0.011mm。
3., draw using GB5270-2005 standards that lattice are viscous to draw detection to 1 liang of plane tin bronze coating of test piece, have no tin bronze
Coating comes off, and shows that adhesion is good between coating and matrix.
4., the curved disconnected detection of GB5270-2005 standards is used to 1 liang of plane tin bronze coating of test piece, have no that the excurvation of test piece 1 is put down
Face tin bronze craze of coating comes off, and shows that adhesion is excellent between coating and matrix.
The steel and iron parts cyanideless electro-plating tin bronze of embodiment 4
First, it is sample still with the test piece 1 in embodiment 3, cyanideless electro-plating tin bronze is carried out using the inventive method, according to such as
Lower step operation：
1st, oil removing is carried out to test piece 1, is cleaned up, cleaning method is identical with cleaning method in embodiment 3.
2nd, preplating Copper treatment：The test piece 1 cleaned up is inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as the moon
Pole, using fine copper plate as anode, negative electrode is electroplated：
1., prepare super low concentration cupric pyrophosphate copper pre-plating tank liquor, its component is：
Cupric pyrophosphate (Cu2P2O7)：2g/L；
Potassium pyrophosphate (K4P2O7)：215g/L；
Triethanolamine：7.5g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned super low concentration cupric pyrophosphate copper pre-plating tank liquor to the preplating Copper treatment of test piece 1, plating condition of work is：
Ith, plating solution operating temperature：18℃；
IIth, annode area：Cathode area ≈ 2：1；
IIIth, cathode-current density：3A/dm2；
IVth, the cathode current of test piece 1：4.5A；
Vth, the copper pre-plating bottoming time：2 minutes；
VIth, electroplating power supply：50A/12V silicon controlled rectifier (SCR)s.
The 3rd, test piece 1 is taken out to flowing running water from copper pre-plating groove clean 1~2 time.
4th, the test piece 1 after cleaning is inserted in cyanideless electro-plating tin bronze electroplate liquid as negative electrode, using fine copper plate as anode,
Negative electrode is electroplated：
1., prepare pyrophosphate cyanideless electro-plating tin bronze electroplate liquid, its component is：
Copper ion (Cu2+)：13.5g/L；Potassium pyrophosphate (K4P2O7)：255g/L；
Tin ion (Sn2+)：1.75g/L；Disodium hydrogen phosphate (Na2HPO4)：38g/L；
Trisodium citrate (Na3C6H5O7)：7g/L；Nitrilotriacetic acid：32.5g/L；
Wherein copper ion (Cu2+) by cupric pyrophosphate (Cu2P2O7) hydrolysis offer, tin ion (Sn2+) by stannous pyrophosphate
(Sn2P2O7) hydrolysis offer.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate cyanideless electro-plating tin bronze electroplate liquid test piece 1 is electroplated, operating condition is：
Ith, bath pH value：8.6；
IIth, plating solution operating temperature：28℃；
IIIth, annode area：Cathode area ≈ 2：1；
IVth, cathode-current density：1A/dm2；
Vth, the cathode current of test piece 1：1.5A；
VIth, the tin bronze time is electroplated in test piece 1：90 minutes；
VIIth, electroplating power supply：Tri- sections of timing silicon controlled rectifier (SCR)s of 50A/12V.
Test piece 1 is taken out from plating tin bronze groove after having electroplated, flowing running water dries after cleaning up.
2nd, electroplating effect is verified
The compliance test result of coating after test piece 1 is electroplated using the inventive method plating tin bronze：
1., 1 liang of plane tin bronze coating of test piece uniformly, it is fine and close, color is golden yellow.
2., the plane tin bronze thickness of coating of test piece 1 one be 0.0115mm, another plane tin bronze thickness of coating is
0.012mm。
3., draw using GB5270-2005 standards that lattice are viscous to draw detection to 1 liang of plane tin bronze coating of test piece, have no tin bronze
Coating comes off, and shows that adhesion is good between coating and matrix.
4., the curved disconnected detection of GB5270-2005 standards is used to 1 liang of plane tin bronze coating of test piece, have no that the excurvation of test piece 1 is put down
Face tin bronze craze of coating comes off, and shows that adhesion is excellent between coating and matrix.
The steel and iron parts cyanideless electro-plating tin bronze of embodiment 5
First, it is sample still with the test piece 1 in embodiment 3, cyanideless electro-plating tin bronze is carried out using the inventive method, according to such as
Lower step operation：
1st, oil removing is carried out to test piece 1, is cleaned up, cleaning method is identical with cleaning method in embodiment 3.
2nd, preplating Copper treatment：The test piece 1 cleaned up is inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as the moon
Pole, using fine copper plate as anode, negative electrode is electroplated：
1., prepare super low concentration cupric pyrophosphate copper pre-plating tank liquor, its component is：
Cupric pyrophosphate (Cu2P2O7)：2.2g/L；
Potassium pyrophosphate (K4P2O7)：235g/L；
Triethanolamine：8g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned super low concentration cupric pyrophosphate copper pre-plating tank liquor to the preplating Copper treatment of test piece 1, plating condition of work is：
Ith, plating solution operating temperature：32℃；
IIth, annode area：Cathode area ≈ 2：1；
IIIth, cathode-current density：2A/dm2；
IVth, the cathode current of test piece 1：3A；
Vth, the copper pre-plating bottoming time：2 minutes；
VIth, electroplating power supply：50A/12V silicon controlled rectifier (SCR)s.
The 3rd, test piece 1 is taken out to flowing running water from copper pre-plating groove clean 1~2 time.
4th, the test piece 1 after cleaning is inserted in cyanideless electro-plating tin bronze electroplate liquid as negative electrode, using fine copper plate as anode,
Negative electrode is electroplated：
1., prepare pyrophosphate cyanideless electro-plating tin bronze electroplate liquid, its component is：
Copper ion (Cu2+)：15.5g/L；Potassium pyrophosphate (K4P2O7)：270g/L；
Tin ion (Sn2+)：2.25g/L；Dipotassium hydrogen phosphate (K2HPO4)：43g/L；
Trisodium citrate (Na3C6H5O7)：8.5g/L；Nitrilotriacetic acid：35g/L；
Wherein copper ion (Cu2+) by cupric pyrophosphate (Cu2P2O7) hydrolysis offer, tin ion (Sn2+) by stannous pyrophosphate
(Sn2P2O7) hydrolysis offer.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate cyanideless electro-plating tin bronze electroplate liquid test piece 1 is electroplated, operating condition is：
Ith, bath pH value：8.6；
IIth, plating solution operating temperature：30℃；
IIIth, annode area：Cathode area ≈ 2：1；
IVth, cathode-current density：1.5A/dm2；
Vth, the cathode current of test piece 1：2.3A；
VIth, the tin bronze time is electroplated in test piece 1：85 minutes；
VIIth, electroplating power supply：Tri- sections of timing silicon controlled rectifier (SCR)s of 50A/12V.
Test piece 1 is taken out from plating tin bronze groove after having electroplated, flowing running water dries after cleaning up.
2nd, electroplating effect is verified
The compliance test result of coating after test piece 1 is electroplated using the inventive method plating tin bronze：
1., 1 liang of plane tin bronze coating of test piece uniformly, it is fine and close, color is golden yellow.
2., the plane tin bronze thickness of coating of test piece 1 one be 0.0125mm, another plane tin bronze thickness of coating is
0.013mm。
3., draw using GB5270-2005 standards that lattice are viscous to draw detection to 1 liang of plane tin bronze coating of test piece, have no tin bronze
Coating comes off, and shows that adhesion is good between coating and matrix.
4., the curved disconnected detection of GB5270-2005 standards is used to 1 liang of plane tin bronze coating of test piece, have no that the excurvation of test piece 1 is put down
Face tin bronze craze of coating comes off, and shows that adhesion is excellent between coating and matrix.
The steel and iron parts cyanideless electro-plating tin bronze of embodiment 6
First, it is sample still with the test piece 1 in embodiment 3, cyanideless electro-plating tin bronze is carried out using the inventive method, according to such as
Lower step operation：
1st, oil removing is carried out to test piece 1, is cleaned up, cleaning method is identical with cleaning method in embodiment 3.
2nd, preplating Copper treatment：The test piece 1 cleaned up is inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as the moon
Pole, using fine copper plate as anode, negative electrode is electroplated：
1., prepare super low concentration cupric pyrophosphate copper pre-plating tank liquor, its component is：
Cupric pyrophosphate (Cu2P2O7)：2.5g/L；
Potassium pyrophosphate (K4P2O7)：250g/L；
Triethanolamine：10g/L.
Above medicine is commercially available technical grade medicine.
2., with above-mentioned super low concentration cupric pyrophosphate copper pre-plating tank liquor to the preplating Copper treatment of test piece 1, plating condition of work is：
Ith, plating solution operating temperature：45℃；
IIth, annode area：Cathode area ≈ 2：1；
IIIth, cathode-current density：1A/dm2；
IVth, the cathode current of test piece 1：1.5A；
Vth, the copper pre-plating bottoming time：3 minutes；
VIth, electroplating power supply：50A/12V silicon controlled rectifier (SCR)s.
The 3rd, test piece 1 is taken out to flowing running water from copper pre-plating groove clean 1~2 time.
4th, the test piece 1 after cleaning is inserted in cyanideless electro-plating tin bronze electroplate liquid as negative electrode, using fine copper plate as anode,
Negative electrode is electroplated：
1., prepare pyrophosphate cyanideless electro-plating tin bronze electroplate liquid, its component is：
Copper ion (Cu2+)：17g/L；Potassium pyrophosphate (K4P2O7)：280g/L；
Tin ion (Sn2+)：2.5g/L；Dipotassium hydrogen phosphate (K2HPO4)：50g/L；
Trisodium citrate (Na3C6H5O7)：10g/L；Nitrilotriacetic acid：40g/L；
Wherein copper ion (Cu2+) by cupric pyrophosphate (Cu2P2O7) hydrolysis offer, tin ion (Sn2+) by stannous pyrophosphate
(Sn2P2O7) hydrolysis offer.Above medicine is commercially available technical grade medicine.
2., with above-mentioned pyrophosphate cyanideless electro-plating tin bronze electroplate liquid test piece 1 is electroplated, operating condition is：
Ith, bath pH value：8.8；
IIth, plating solution operating temperature：35℃；
IIIth, annode area：Cathode area ≈ 2：1；
IVth, cathode-current density：2A/dm2；
Vth, the cathode current of test piece 1：3.0A；
VIth, the tin bronze time is electroplated in test piece 1：80 minutes；
VIIth, electroplating power supply：Tri- sections of timing silicon controlled rectifier (SCR)s of 50A/12V.
Test piece 1 is taken out from plating tin bronze groove after having electroplated, flowing running water dries after cleaning up.
2nd, electroplating effect is verified
The compliance test result of coating after test piece 1 is electroplated using the inventive method plating tin bronze：
1., 1 liang of plane tin bronze coating of test piece uniformly, it is fine and close, color is golden yellow.
2., the plane tin bronze thickness of coating of test piece 1 one be 0.0115mm, another plane tin bronze thickness of coating is
0.0125mm。
3., draw using GB5270-2005 standards that lattice are viscous to draw detection to 1 liang of plane tin bronze coating of test piece, have no tin bronze
Coating comes off, and shows that adhesion is good between coating and matrix.
4., the curved disconnected detection of GB5270-2005 standards is used to 1 liang of plane tin bronze coating of test piece, have no that the excurvation of test piece 1 is put down
Face tin bronze craze of coating comes off, and shows that adhesion is excellent between coating and matrix.
Claims (6)
- A kind of 1. method of steel and iron parts cyanideless electro-plating tin bronze, it is characterised in that comprise the following steps：1) first by steel and iron parts oil removing, clean up；2) preplating Copper treatment：The steel and iron parts cleaned up are inserted in super low concentration cupric pyrophosphate copper pre-plating tank liquor as negative electrode, Using fine copper plate as anode, temperature be 15~45 DEG C, cathode-current density be 1~4A/dm2Under conditions of to negative electrode carry out electricity Plating 1~3 minute；The super low concentration cupric pyrophosphate copper pre-plating tank liquor formula is：1.5~2.5g/L of cupric pyrophosphate, potassium pyrophosphate 200~250g/L, 5~10g/L of triethanolamine；3) steel and iron parts after preplating Copper treatment are taken out, rinsed；4) cyanideless electro-plating tin bronze：As the moon in steel and iron parts insertion cyanideless electro-plating tin bronze electroplate liquid after step 3) is rinsed Pole, using fine copper plate as anode, negative electrode is electroplated；The cyanideless electro-plating tin bronze plating solution formula is：Cu2+12~17g/ L, 240~280g/L of potassium pyrophosphate, Sn2+30~50g/L of 1.5~2.5g/L, disodium hydrogen phosphate or dipotassium hydrogen phosphate, citric acid are received 5~10g/L, 30~40g/L of nitrilotriacetic acid, pH value 8.3~8.8, the Cu2+From cupric pyrophosphate, the Sn2+Derive from Stannous pyrophosphate.
- 2. the method for steel and iron parts cyanideless electro-plating tin bronze according to claim 1, it is characterised in that steel described in step 1) Ironware oil removing, cleaning method comprise the following steps：A, dried after cleaning steel and iron parts surface and oil contaminant with organic solvent；B, soaked using metal degreasing amidin and clean steel and iron parts；Steel and iron parts are immersed to pickling in 8% aqueous hydrochloric acid solution, rinse c,；D, steel and iron parts are immersed in 5% aqueous sulfuric acid and activated, rinsed.
- 3. the method for steel and iron parts cyanideless electro-plating tin bronze according to claim 1, it is characterised in that surpass described in step 2) Low concentration cupric pyrophosphate copper pre-plating tank liquor formula is：1.8~2.2g/L of cupric pyrophosphate, 210~240g/L of potassium pyrophosphate, three ethanol 6~9g/L of amine.
- 4. the method for steel and iron parts cyanideless electro-plating tin bronze according to claim 1, it is characterised in that nothing described in step 4) Cyanogen electroplates tin bronze plating solution formula：Cu2+13~16g/L, 250~270g/L of potassium pyrophosphate, Sn2+1.6~2.4g/L, phosphorus 35~45g/L of sour disodium hydrogen or dipotassium hydrogen phosphate, citric acid receive 6~9g/L, 32~38g/L of nitrilotriacetic acid.
- 5. the method for the steel and iron parts cyanideless electro-plating tin bronze according to claim 1 or 4, it is characterised in that right in step 4) Steel and iron parts carry out cyanideless electro-plating tin bronze condition of work be：Temperature be 25~35 DEG C, cathode-current density be 0.5~2A/ dm2Under conditions of plating is carried out 80~90 minutes to negative electrode.
- 6. the method for steel and iron parts cyanideless electro-plating tin bronze according to claim 1, it is characterised in that surpass described in step 2) Cyanideless electro-plating tin bronze electroplate liquid described in low concentration cupric pyrophosphate copper pre-plating tank liquor and step 4) is prepared using deionized water.
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| CN109989080B (en) * | 2019-04-09 | 2023-03-17 | 西安交通大学 | Method for preparing high-tin bronze corrosion-resistant film on surface of steel by polyhydroxy ionic liquid electrodeposition |
| 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 |
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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 |
| CN104499018A (en) * | 2014-11-28 | 2015-04-08 | 广东致卓精密金属科技有限公司 | Alkaline non-cyanide pre-plated copper plating solution and process |
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| CN104499018A (en) * | 2014-11-28 | 2015-04-08 | 广东致卓精密金属科技有限公司 | Alkaline non-cyanide pre-plated copper plating solution and process |
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