CN104630752A - Chemical nickel plating liquor and high-corrosion chemical nickel plating method thereof - Google Patents
Chemical nickel plating liquor and high-corrosion chemical nickel plating method thereof Download PDFInfo
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- CN104630752A CN104630752A CN201510102281.6A CN201510102281A CN104630752A CN 104630752 A CN104630752 A CN 104630752A CN 201510102281 A CN201510102281 A CN 201510102281A CN 104630752 A CN104630752 A CN 104630752A
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Abstract
The invention discloses chemical nickel plating liquor and a high-corrosion chemical nickel plating method thereof. The chemical nickel plating liquor comprises a main salt, a reducer and a complexing agent. A preparation method for the chemical nickel plating liquor comprises the following steps: adding deionized water which accounts for 50% in volume fraction of pre-prepared plating liquor at a room temperature, and then adding and stirring the complexing agent, the main salt and the reducer until completely dissolving; finally, adding the rest of the deionized water, regulating the pH value, and heating to a required temperature. The high-corrosion chemical nickel plating method comprises the following steps: cleaning a to-be-plated workpiece by deionized water, directly contacting with the chemical nickel plating liquor, getting out the workpiece after soaking for a certain time, cleaning and drying to obtain a coating. The chemical nickel plating liquor has the advantages that: a nickel coating obtained by chemically plating nickel with the chemical nickel plating liquor has excellent corrosion resistance which is more than 200 hours according to a neutral salt spray test of NaCl with mass fraction of 5%.
Description
Technical field
The invention belongs to electroless plating field, particularly relate to a kind of chemical nickel plating method obtaining high anti-corrosion nickel coating.
Background technology
Chemical nickel plating is the one of electroless plating, is widely used in aerospace, electronic industry, automotive industry, oil and gas etc.But the chemical Ni-plating layer that current every each industry obtains also exists the poor problem of nickel coating solidity to corrosion.Chemical nickel plating method provided by the invention is a kind of chemical nickel plating method obtaining the chemical Ni-plating layer of high anti-corrosion.
Summary of the invention
The invention provides a kind of method of chemical nickel-plating liquid and high anti-corrosion chemical nickel plating thereof, and by the nickel coating that this chemical nickel-plating liquid obtains, there is high solidity to corrosion.
The present invention realizes like this, a kind of chemical nickel-plating liquid, it is characterized in that: containing main salt, reductive agent and the coordination agent of purity at least more than analytical pure in described nickel-plating liquid, described main salt is the six directions water nickelous chloride of 32 ~ 40 g/L, described reductive agent is a hydration sodium hypophosphite of 175 ~ 185 g/L, and described coordination agent comprises the succinic acid of 128 ~ 135 g/L and the 2 hydroxy propanoic acid of 200 ~ 210 g/L.
For the preparation method of described chemical nickel-plating liquid in the present invention, be not particularly limited, each component is mixed in proportion; The method steps of its preparative chemistry nickel-plating liquid is as follows:
(1) at room temperature adding prewired plating solution volume fraction is the deionized water of 50%;
(2) then add coordination agent and main salt under agitation successively, be stirred to whole dissolving, then add reductive agent and be stirred to whole dissolving;
(3) finally add remaining ionized water, adjust by the pH value of pH value adjusting agent to obtain solution, be heated to temperature required can use.
PH value adjusting agent of the present invention is NaOH and hydrochloric acid, the bath pH value of adjustment is 5.8 ~ 6.2, the sedimentation velocity of pH value to chemical nickel plating of chemical nickel-plating liquid has a great impact, and therefore adopts the pH value of NaOH and hydrochloric acid adjustment chemical nickel-plating liquid, remains between 5.8 ~ 6.2.
The method of high anti-corrosion chemical nickel plating of the present invention, by workpiece to be plated before directly contacting with chemical nickel-plating liquid must by washed with de-ionized water after, directly contact with chemical nickel-plating liquid again, after dipping for some time, obtain coating after taking out workpiece cleaning drying, wherein adopted chemical nickel-plating liquid is chemical nickel-plating liquid provided by the invention.
The purity of NaOH of the present invention and hydrochloric acid is at least more than analytical pure.
The plating temperature of chemical nickel-plating liquid of the present invention is 87 ~ 93 DEG C, and the coating sedimentation rate of described chemical nickel plating is 0.013 ~ 0.018 mm/ hour.
The thickness of coating of chemical nickel plating of the present invention is 0.04 ~ 0.05 mm.
The sedimentation rate of chemical nickel plating of the present invention is constantly little lower than 0.005 mm/, and chemical nickel-plating liquid is discarded, and again prepares new chemical nickel-plating liquid.
The Vickers' hardness of the coating of chemical nickel plating of the present invention is 300 ~ 500.
Advantage of the present invention is: the preparation method providing a kind of chemical nickel-plating liquid and chemical nickel-plating liquid thereof, this chemical nickel-plating liquid is adopted to carry out the corrosion resistance nature of the nickel coating that chemical nickel plating obtains, by U.S. material association criterion ASTM B117, the neutral salt spray test being 5%NaCl at massfraction is tested, solidity to corrosion is greater than 200 hours, has excellent solidity to corrosion.
Embodiment
State to make the present invention and clearly understand, below in conjunction with example, the present invention is further elaborated.It should be noted that, specific examples described herein only for explaining the present invention, is not intended to limit the present invention.
embodiment one
(1) chemical nickel plating liquid formula one:
Main salt: six directions water nickelous chloride 32 g/L;
Reductive agent: hydration sodium hypophosphite 175 g/L;
Coordination agent: succinic acid 128 g/L, 2 hydroxy propanoic acid 200 g/L;
Plating solution preparation steps: the deionized water first adding prewired plating solution 50% (volume fraction) in advance, then coordination agent is added under agitation successively, after main salt is stirred to and all dissolves, add reductive agent again and be stirred to whole dissolving, finally add remaining deionized water.With NaOH and/or hydrochloric acid, the pH value to obtain solution is adjusted to 5.8 ~ 6.2, and being heated to 87 DEG C can use.
(2) using the carbon steel or low alloy steel of the copper coin of 50 mm × 50 mm, 50 mm × 50 mm as workpiece to be plated, after normal oil removing, rust cleaning, last cleaning must use deionized water; Then workpiece leaching to be plated is placed in chemical nickel plating liquid formula one, plating obtains plating piece in 3.5 hours.
(3) nickel coating on plating piece surface is detected, detect the Vickers' hardness obtaining coating and be greater than 300; Carry out solidity to corrosion detection to the nickel coating on plating piece surface, be the neutral salt spray test of 5%NaCl at massfraction, solidity to corrosion is greater than 200 hours.
embodiment two
(1) chemical nickel plating liquid formula two:
Main salt: 36 g/L of six directions water nickelous chloride;
Reductive agent: 180 g/L of a hydration sodium hypophosphite;
Coordination agent: succinic acid 130 g/L, 2 hydroxy propanoic acid 205 g/L;
Plating solution preparation steps: the deionized water first adding prewired plating solution 50% (volume fraction) in advance, then coordination agent is added under agitation successively, after main salt is stirred to and all dissolves, add reductive agent again and be stirred to whole dissolving, finally add remaining deionized water.With NaOH and/or hydrochloric acid, the pH value to obtain solution is adjusted to 5.8 ~ 6.2, and being heated to 90 DEG C can use.
(2) using 50 mm × 50 mm copper coins, carbon steel or low alloy steel as workpiece to be plated, after normal oil removing, rust cleaning, last cleaning must use deionized water; Then workpiece to be plated is placed in chemical nickel plating liquid formula two, plating obtains plating piece in 3 hours.
(3) nickel coating on plating piece surface is detected, detect the Vickers' hardness obtaining coating and be greater than 300; Carrying out solidity to corrosion detection to the nickel coating on plating piece surface, is the neutral salt spray test of 5%NaCl at massfraction, and solidity to corrosion is greater than 200 hours h.
embodiment three
(1) chemical nickel plating liquid formula three:
Main salt: six directions water nickelous chloride 40 g/L;
Reductive agent: hydration sodium hypophosphite 185 g/L;
Coordination agent: succinic acid 135g/L, 2 hydroxy propanoic acid 210 g/L;
Plating solution preparation steps: the deionized water first adding prewired plating solution in advance, then adds coordination agent, after main salt is stirred to and all dissolves under agitation successively, then adds reductive agent and be stirred to whole dissolving, finally adds remaining deionized water.With NaOH and/or hydrochloric acid, the pH value to obtain solution is adjusted to 5.8 ~ 6.2, and being heated to 93 DEG C can use.
(2) using 50 mm × 50 mm copper coins, carbon steel or low alloy steel as workpiece to be plated, after normal oil removing, rust cleaning, last cleaning must use deionized water; Then workpiece to be plated is placed in chemical nickel plating liquid formula three, plating 3 h obtains plating piece.
(3) nickel coating on plating piece surface is detected, detect the Vickers' hardness obtaining coating and be greater than 300; Carry out solidity to corrosion detection to the nickel coating on plating piece surface, be the neutral salt spray test of 5%NaCl at massfraction, solidity to corrosion is greater than 200 h.
Claims (10)
1. a chemical nickel-plating liquid, it is characterized in that: containing main salt, reductive agent and coordination agent in described nickel-plating liquid, described main salt is the six directions water nickelous chloride of 32 ~ 40 g/L, described reductive agent is a hydration sodium hypophosphite of 175 ~ 185 g/L, and described coordination agent comprises the succinic acid of 128 ~ 135 g/L and the 2 hydroxy propanoic acid of 200 ~ 210 g/L.
2. a preparation method for chemical nickel-plating liquid according to claim 1, is characterized in that method steps is as follows:
(1) at room temperature adding prewired plating solution volume fraction is the deionized water of 50%;
(2) then add coordination agent and main salt under agitation successively, be stirred to whole dissolving, then add reductive agent and be stirred to whole dissolving;
(3) finally add remaining ionized water, adjust by the pH value of pH value adjusting agent to obtain solution, be heated to temperature required can use.
3. the preparation method of a kind of chemical nickel-plating liquid according to claim 2, is characterized in that; Described pH value adjusting agent is NaOH and hydrochloric acid, and the bath pH value of adjustment is 5.8 ~ 6.2.
4. a method for high anti-corrosion chemical nickel plating according to claim 1, is characterized in that method steps is; By washed with de-ionized water by workpiece to be plated, more directly contact with chemical nickel-plating liquid, after dipping for some time, after taking out workpiece cleaning drying, obtain coating.
5. a kind of chemical nickel-plating liquid according to claim 1, is characterized in that: the purity of described main salt, reductive agent and coordination agent three kinds of pharmaceutical chemicalss is at least more than analytical pure.
6. the preparation method of a kind of chemical nickel-plating liquid according to claim 3, the purity of described NaOH and hydrochloric acid is at least more than analytical pure.
7. the method for high anti-corrosion chemical nickel plating according to claim 4, is characterized in that; The plating temperature of described chemical nickel-plating liquid is 87 ~ 93 DEG C, and the coating sedimentation rate of described chemical nickel plating is 0.013 ~ 0.018 mm/ hour.
8. the method for high anti-corrosion chemical nickel plating according to claim 4, is characterized in that; The thickness of coating of described chemical nickel plating is 0.04 ~ 0.05 mm.
9. the method for high anti-corrosion chemical nickel plating according to claim 4, is characterized in that; The sedimentation rate of described chemical nickel plating is constantly little lower than 0.005 mm/, and chemical nickel-plating liquid is discarded, and again prepares new chemical nickel-plating liquid.
10. the method for high anti-corrosion chemical nickel plating according to claim 4, is characterized in that; The Vickers' hardness of the coating of described chemical nickel plating is 300 ~ 500.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102281.6A CN104630752A (en) | 2015-03-10 | 2015-03-10 | Chemical nickel plating liquor and high-corrosion chemical nickel plating method thereof |
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| CN201510102281.6A CN104630752A (en) | 2015-03-10 | 2015-03-10 | Chemical nickel plating liquor and high-corrosion chemical nickel plating method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB845720A (en) * | 1956-06-21 | 1960-08-24 | Columbia Southern Chem Corp | Chemical plating bath |
| CN101314848A (en) * | 2008-07-16 | 2008-12-03 | 中山大学 | Non-ammonia type plating solution for chemical nickel plating |
-
2015
- 2015-03-10 CN CN201510102281.6A patent/CN104630752A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB845720A (en) * | 1956-06-21 | 1960-08-24 | Columbia Southern Chem Corp | Chemical plating bath |
| CN101314848A (en) * | 2008-07-16 | 2008-12-03 | 中山大学 | Non-ammonia type plating solution for chemical nickel plating |
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