CN1916239A - Method for electroplating complex construction - Google Patents
Method for electroplating complex construction Download PDFInfo
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- CN1916239A CN1916239A CN 200510092803 CN200510092803A CN1916239A CN 1916239 A CN1916239 A CN 1916239A CN 200510092803 CN200510092803 CN 200510092803 CN 200510092803 A CN200510092803 A CN 200510092803A CN 1916239 A CN1916239 A CN 1916239A
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Abstract
This invention provides a method for electroplating complex structure. The method comprises: (1) performing chemical plating on the workpiece in a chemical plating solution so that metal ions are deposited onto the surface of the workpiece; (2) cleaning the workpiece; (3) placing the workpiece in an electroplating solution with voltage applied between the anode and the cathode, and electroplating to grow a film on the surface of the workpiece. The method solves the defect of ununiformity in the core plating layer and outer surface of small and complex structure in electroplating process.
Description
Technical field
The present invention relates to a kind of electro-plating method, relate to a kind of electro-plating method that is applied to the complex construction of a plurality of part assemblings specifically.
Background technology
Hardware commonly used is provided with counterbore, blind hole, inner-walls of duct, turning, cloudy position, in the electroplating process, because the surface action of electric current makes above-mentioned position be difficult to coating.In addition, surface action makes the two ends of the outside surface of tubular structure electroplate bed thickness, and the tubular structure that intermediate thin, particularly caliber are smaller makes the inwall of tubular structure can't plate coating, does not have antirust effect.In addition, when handling the bigger tubular part of caliber, the difference of the thickness of the coating of outside surface middle portion and the coating at two ends is not very big, and when electroplating the tubular member of small dimension, the difference of the coating of middle portion and the thickness of coating at two ends is very big with respect to the size of part, makes that the part after the electroplating processes can't use.
For example electroplate a kind of arbitrarily metallic hose of bending.Electroplating technology commonly used is because the surface action of electric current make the piped inwall to plate, thereby inwall can not be antirust.In addition, outside surface two ends of flexible pipe are electroplated bed thickness, intermediate thin.Like this, certain coating is arranged, must prolong electroplating time, thereby make two end coating thicker than the coating of middle portion in order to make middle portion.This common electro-plating method is when handling caliber 10mm with top hose, and problem is little.And when handling caliber 10mm with bottom hose, because the flat wire of outsourcing is very little with the gap of inner close winding spring, electrolytic coating one is thick, the product that plating is got well just " " make a sound, thereby can't use, and can't do over again.
Summary of the invention
The technical problem that the present invention solves provides a kind of electro-plating method of complex construction, has solved small dimension and the heart portion coating of complex construction and the defective that the outside surface uneven coating is spared in the electroplating technology.
Technical scheme of the present invention is:
A kind of electro-plating method of complex construction comprises:
(1) plating piece is immersed in and carries out electroless plating in the chemical plating fluid, makes metal ion be deposited on the plating piece surface;
(2) plating piece is cleaned;
(3) plating piece after will cleaning is put into the electroplate liquid that applies voltage between negative electrode and the anode and is electroplated, and makes the surface growth of plated film at plating piece.
Described cleaning step (2) is to wash with water earlier, and the pure water of reusable heat cleans then.Described activatory step is that plating piece is put into dilute sulphuric acid.Step (1) also comprises the following steps: before
The step of a, degreasing;
The step of b, washing;
The step of c, hot degreasing;
The step of d, washing;
The step of e, electrochemical degreasing;
The step of f, washing;
The step of g, ultrasonic cleaning;
The step of h, washing;
The step that the pure water of i, heat is washed;
The step of j, activation treatment.
Step g need be carried out twice.
The condition that step c adopts is: remove oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
The condition that step e adopts is: the concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O 20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
The condition that step g adopts is: in ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
The condition that step j adopts is: the concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
The coating of described electroless plating is nickel.
The thickness of coating of described electroless plating is 0.003mm-0.005mm.
The processing parameter of described chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L-10g/L, PH=3-7, temperature is 70 ℃-100 ℃, the time is 10-50 minute.
Described galvanized coating is chromium.
Described galvanized thickness of coating is 0.0005mm-0.002mm.
The processing parameter of described electroplating solution is: chromic anhydride CrO
3Be 200g/L-300g/L, sulfuric acid H
2SO
4Be 2g/L-4g/L, trivalent chromium Cr
3+Be 1g/L-5g/L, temperature is 40 ℃-45 ℃, and current density is 10A/dm-30A/dm
2Time is 5-10 minute.
The step that also comprises washing and oven dry.
The invention has the beneficial effects as follows: adopt electroless plating and galvanized composite coating method, electroless plating and plating are combined, make chemical plating as galvanized bottom, solved the problem that to plate inwall and uneven coating of electroplating effectively, solved the problem that electroless plating can not be plated bright chromium simultaneously again.Because electroless plating is a kind of chemical reduction process of ion deposition, therefore can be at complex construction, the surface-coated nickel of the complex construction of small dimension particularly.For complex construction, for example the inwall of metallic hose, outside surface can both obtain uniform nickel layer, and this coating is as the bottom of follow-up electrodeposited chromium.Nickel dam densification, the hole that plates like this is little, strong adhesion, corrosion-resistant, wear-resistant, and surface hardness reaches Hv400-Hv700.After such bottom layer treatment, electrolytic coating chromium light, precision height need not just can reach service requirements by correct grinding.Because the combination of coating nickel and coating chromium is firm, makes whole coating combine firmly with metal parts, and the hardness height.
Description of drawings
Fig. 1 is the sectional view of metallic hose Yanzhong axis.
Embodiment
Metallic hose is a kind of arbitrarily crooked metal tube of realizing, his heart portion is close around the spring that forms by the steel wire of internal layer more than the middle carbon, at the outer surface groove place of spring tightly around cover wire, thereby constitute a kind of metallic hose, metallic hose requires outside surface to electroplate bright chromium for antirust and attractive in appearance.
If metallic hose does not reach the condition that needs before the plating, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
Enter electroless plating then, the present invention adopts the bottom of chemical nickel plating as electrodeposited chromium.The principle of chemical nickel plating (Electroless plating) is: no current by the time in same solution redoxomorphism takes place by reductive agent, thereby make the metal ion reduce deposition at piece surface.So electroless plating also can be described as a kind of with metal refining, and is controlled, the chemical reduction process of autocatalysis.
Chemical nickel plating is commonly used for the surface treatment of Precision Machinery Elements. and as printer, the external diameter tolerance of duplicating machine needs the axial workpiece of strict control etc.Since be a kind of chemical reduction process of ion deposition, therefore can be at the surface-coated nickel of steel flexible pipe.No matter flexible pipe or other complicated assembling parts as long as touch plating bath, just can obtain uniform coating.The inwall of flexible pipe, outside surface can both obtain uniform nickel layer, the bottom of electrodeposited chromium after can be used as.The nickel dam coating densification that plates like this, hole is little, and solidity to corrosion is strong, and is wear-resistant, and surface hardness reaches Hv400-700.
Among the present invention, the processing parameter of chemical nickel plating is chosen as follows:
NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L-10g/L, PH=3-7, temperature is 70 ℃-100 ℃, the electroless plating time is 10-50 minute.
The thickness of the coating nickel of above-mentioned chemical nickel plating is 0.003mm-0.005mm.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 200g/L-300g/L, sulfuric acid H
2SO
4Be 2g/L-4g/L, trivalent chromium Cr
3+Be 1g/L-5g/L, temperature is 40 ℃-45 ℃, and current density is 10A/dm-30A/dm
2Time is 5-10 minute.
After plating is finished the metallic hose after electroplating is washed, dried then.
The thickness of coating of electrodeposited chromium is 0.0005mm-0.002mm.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
One of the preferred embodiments of the present invention are described below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L-6g/L, PH=3-4.5, temperature is 90 ℃-100 ℃, the electroless plating time is 20-50 minute.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into electroplate liquid after pole plate applies voltage, the processing parameter of electroplate liquid is: chromic anhydride CrO
3Be 200g/L-230g/L, sulfuric acid H
2SO
4Be 2g/L-2.3g/L, trivalent chromium Cr
3+Be 1g/L-2g/L, temperature is 40 ℃-45 ℃, and current density is 5-10A/dm, and electroplating time is 5-10 minute.
The thickness of coating of electrodeposited chromium is controlled between the 0.0005mm-0.002mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be two of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 6g/L-10g/L, PH=4.5-7, temperature is 70 ℃-90 ℃, the electroless plating time is 10-20 minute.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 270g/L-300g/L, sulfuric acid H
2SO
4Be 3.7g/L-4g/L, trivalent chromium Cr
3+Be 4-5g/L, temperature is 40 ℃-45 ℃, and current density is 30-40A/dm, and the time is 10-20 minute.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be three of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 6g/L, PH=4.5-5.5, temperature is 85 ℃-90 ℃, the electroless plating time is about 20 minutes.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 230g/L-270g/L, sulfuric acid H
2SO
4Be 2.3g/L-3.7g/L, trivalent chromium Cr
3+Be 2g/L-4g/L, temperature is 40 ℃-45 ℃, and current density is 10-30A/dm, and the time is about 10 minutes.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be four of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 6g/L, PH=4.5-5.5, temperature is 85 ℃-90 ℃, the electroless plating time is about 20 minutes.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, the time
Between 20 seconds-2 minutes.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 230g/L-270g/L, sulfuric acid H
2SO
4Be 2.3g/L-3.7g/L, trivalent chromium Cr
3+Be 2g/L-4g/L, temperature is 40 ℃-45 ℃, and current density is 10-30A/dm, and the time is about 10 minutes.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be five of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 6g/L, PH=5, temperature is 88 ℃, the electroless plating time is about 20 minutes.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 250g/L, sulfuric acid H
2SO
4Be 3g/L, trivalent chromium Cr
3+Be 3g/L, temperature is 43 ℃, and current density is 20A/dm, and the time is about 10 minutes.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be six of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
4H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 7g/L, PH=5.2, temperature is 86 ℃, the electroless plating time is about 20 minutes.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, processing parameter is: chromic anhydride CrO
3Be 260g/L, sulfuric acid H
2SO
4Be 3.3g/L, trivalent chromium Cr
3+Be 3.5g/L, temperature is 42 ℃, and current density is 25A/dm, and the time is about 10 minutes.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Be seven of the preferred embodiments of the present invention below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L-10g/L, PH=3-7, temperature is 70 ℃-100 ℃, the time is 10-50 minute.Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into to pole plate applied electroplate liquid behind the voltage, the processing parameter of electroplating solution is: chromic anhydride CrO
3Be 200g/L-300g/L, sulfuric acid H
2SO
4Be 2g/L-4g/L, trivalent chromium Cr
3+Be 1g/L-5g/L, temperature is 40 ℃-45 ℃, and current density is 10A/dm-30A/dm
2Time is 5-10 minute.
The thickness of coating of electrodeposited chromium is between the 0.0005mm-0.005mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Eight of the preferred embodiments of the present invention are described below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L, PH=3, temperature is 100 ℃, the electroless plating time is 10-50 minute.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into electroplate liquid after pole plate applies voltage, the processing parameter of electroplate liquid is: chromic anhydride CrO
3Be 200g/L, sulfuric acid H
2SO
4Be 2g/L, trivalent chromium Cr
3+Be 1g/L, temperature is 40 ℃-45 ℃, and current density is 10A/dm, and electroplating time is 5-10 minute.
The thickness of coating of electrodeposited chromium is controlled between the 0.0005mm-0.002mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Nine of the preferred embodiments of the present invention are described below:
If metallic hose does not reach the condition that plating needs, need to carry out surface treatment method so, this surface treatment method is as follows:
1, degreasing
Use kerosene, normal temperature is handled, and degreasing time is 10-30 minute.
2, hot degreasing
With removing oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
3, electrochemical degreasing
The concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
4, ultrasonic wave is washed
In ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
If that cleans is not thorough, the operation that ultrasonic wave is washed will be carried out the second time, so that thoroughly will thoroughly be cleaned up by metallic hose.The part of complex construction more needs secondary ultrasonic wave to wash.
5, activation treatment
The concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
To put into chemical plating fluid through the metallic hose that cleans and carry out electroless plating, the processing parameter of chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 10g/L, PH=7, temperature is 70 ℃, the electroless plating time is 20-50 minute.
Clean the workpiece carry out after the electroless plating below, cleaning comprises:
1, water cleans;
2, clean with purified hot water, temperature is at 20 ℃-60 ℃;
3, activation treatment, the parameter of activated solution is: dilute sulphuric acid 10%, 20 ℃-60 ℃ of temperature, 20 seconds-2 minutes time.
Electroplate below, the metallic hose after cleaning is put into electroplate liquid after pole plate applies voltage, the processing parameter of electroplate liquid is: chromic anhydride CrO
3Be 300g/L, sulfuric acid H
2SO
4Be 4g/L, trivalent chromium Cr
3+Be 5g/L, temperature is 45 ℃, and current density is 5A/dm, and electroplating time is 5-10 minute.
The thickness of coating of electrodeposited chromium is controlled between the 0.0005mm-0.002mm.
After plating is finished the metallic hose after electroplating is washed, dried then.
It should be noted that above operation forbids the hand contact workpiece.Must heat with the hot water injection before the chromium plating, must guard against preheating in plating bath.
Claims (16)
1, a kind of electro-plating method of complex construction comprises:
(1) plating piece is immersed in and carries out electroless plating in the chemical plating fluid, makes metal ion be deposited on the plating piece surface;
(2) plating piece is cleaned;
(3) plating piece after will cleaning is put into the electroplate liquid that applies voltage between negative electrode and the anode and is electroplated, and makes the surface growth of plated film at plating piece.
2, the electro-plating method of complex construction according to claim 1 is characterized in that: described cleaning step (2) is to wash with water earlier, and the pure water of reusable heat cleans then.
3, the electro-plating method of complex construction according to claim 2 is characterized in that, also comprises the activatory step, and described activatory step is that plating piece is put into dilute sulphuric acid.
4, the electro-plating method of complex construction according to claim 1 is characterized in that: step (1) also comprises the following steps: before
The step of a, degreasing;
The step of b, washing;
The step of c, hot degreasing;
The step of d, washing;
The step of e, electrochemical degreasing;
The step of f, washing;
The step of g, ultrasonic cleaning;
The step of h, washing;
The step that the pure water of i, heat is washed;
The step of j, activation treatment.
5, the electro-plating method of complex construction according to claim 4 is characterized in that: step g need be carried out twice.
6, the electro-plating method of complex construction according to claim 4 is characterized in that, the condition that step c adopts is: remove oil-bound distemper CH-902, temperature is 80 ℃-90 ℃, and concentration is 9%-13%, and be 10-30 minute action time.
7, the electro-plating method of complex construction according to claim 5 is characterized in that, the condition that step e adopts is: the concentration of NaOH is 30g/L-40g/L, JS-115 agent 30g/L-40g/L, NaC
2H
3O
23H
2O 20g/L-50g/L, cathode current density 3A/dm
2-5A/dm
2
8, the electro-plating method of complex construction according to claim 4 is characterized in that, the condition that step g adopts is: in ultrasonic bath, with removing oil-bound distemper CH-902, concentration is 9%-13%, and temperature is 10 ℃-40 ℃, and be 10-30 minute action time.
9, the electro-plating method of complex construction according to claim 4 is characterized in that, the condition that step j adopts is: the concentration of HCL is 6%-7%, and temperature is 10 ℃-40 ℃, and the working hour is 20 seconds to 2 minutes.
10, the electro-plating method of complex construction according to claim 1 is characterized in that, the coating of described electroless plating is nickel.
11, the electro-plating method of complex construction according to claim 10 is characterized in that: the thickness of coating of described electroless plating is 0.003mm-0.005mm.
12, the electro-plating method of complex construction according to claim 10 is characterized in that, the processing parameter of described chemical plating fluid is: NiSO
47H
2O, NaH
2PO
2H
2O, Ni
2+Concentration be 2g/L-10g/L, PH=3-7, temperature is 70 ℃-100 ℃, the time is 10-50 minute.
According to the electro-plating method of claim 1 or 10 described complex constructions, it is characterized in that 13, described galvanized coating is chromium.
14, the electro-plating method of complex construction according to claim 13 is characterized in that, described galvanized thickness of coating is 0.0005mm-0.002mm.
15, the electro-plating method of complex construction according to claim 13 is characterized in that, the processing parameter of described electroplating solution is: chromic anhydride CrO
3Be 200g/L-300g/L, sulfuric acid H
2SO
4Be 2g/L-4g/L, trivalent chromium Cr
3+Be 1g/L-5g/L, temperature is 40 ℃-45 ℃, and current density is 10A/dm-30A/dm
2Time is 5-10 minute.
16, according to the electro-plating method of claim 13 or 15 described complex constructions, it is characterized in that, also comprise the washing after the plating and the step of oven dry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510092803 CN1916239A (en) | 2005-08-18 | 2005-08-18 | Method for electroplating complex construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510092803 CN1916239A (en) | 2005-08-18 | 2005-08-18 | Method for electroplating complex construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1916239A true CN1916239A (en) | 2007-02-21 |
Family
ID=37737301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510092803 Pending CN1916239A (en) | 2005-08-18 | 2005-08-18 | Method for electroplating complex construction |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746110A (en) * | 2013-12-27 | 2015-07-01 | 沈阳鼓风机集团核电泵业有限公司 | Stainless steel fastener screw thread surface chrome plating technology used for nuclear main pump |
| CN114807913A (en) * | 2022-04-09 | 2022-07-29 | 天津市大港镀锌厂 | Chemical nickel plating process method for surface of special-shaped piece |
-
2005
- 2005-08-18 CN CN 200510092803 patent/CN1916239A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746110A (en) * | 2013-12-27 | 2015-07-01 | 沈阳鼓风机集团核电泵业有限公司 | Stainless steel fastener screw thread surface chrome plating technology used for nuclear main pump |
| CN104746110B (en) * | 2013-12-27 | 2018-02-06 | 沈阳鼓风机集团核电泵业有限公司 | A kind of stainless steel support thread surface chrome-plated process applied to core main pump |
| CN114807913A (en) * | 2022-04-09 | 2022-07-29 | 天津市大港镀锌厂 | Chemical nickel plating process method for surface of special-shaped piece |
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