CN85100657A - Chemical nickel plating process for super-plastic zn-al alloy parts - Google Patents
Chemical nickel plating process for super-plastic zn-al alloy parts Download PDFInfo
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- CN85100657A CN85100657A CN 85100657 CN85100657A CN85100657A CN 85100657 A CN85100657 A CN 85100657A CN 85100657 CN85100657 CN 85100657 CN 85100657 A CN85100657 A CN 85100657A CN 85100657 A CN85100657 A CN 85100657A
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Abstract
A kind of chemical nickel plating process for super-plastic Zn-Al alloy parts.This technology can be used for the various baroque surface hardening processing that zinc-aluminium is made, and to improve the polishing machine of workpiece, its coating and matrix have good bonding force, and the plating piece surface hardness can reach Hv 〉=600kg/mm
2Principal character of the present invention is to give after the electronickelling without activation treatment with regard to direct chemical nickel plating, forms the autocatalysis process of a chemical nickel plating on nickel, and chemical nickel plating can be carried out smoothly.The present invention is by the pre-treatment of sandblast and etch 1; 2, pre-plating nickel; 3, three operations of chemical nickel plating are formed.
Description
The invention relates to the super-plastic Zn-Al alloy parts surface hardening handles.
Utilize the characteristic of the high-elongation and the low rheological resistance of super-plastic Zn-Al alloy, can be made into various baroque workpiece.But, the low (HV≤100kg/mm of super-plastic Zn-Al alloy parts hardness
2) not wear-resistant, must handle by surface hardening and improve its hardness, can be used widely.People such as the Japan gold man of Fuji
(1)Reported the experiment of chemical nickel plating on Zn-Al alloy, he floods in phosphoric acid solution, polishes with abrasive cloth by the alloy test piece, the copper pyrophosphate solution replacement copper plating, and copper plate is activation treatment in the Silver Nitrate activation solution, carries out alkaline chemical nickel-plating then.We experiment showed, that above-mentioned technology remains weak point: 1, with abrasive cloth the plating piece of complex contour is polished and be difficult to.In addition, displacement copper layer easily produces precipitation on the surface, influenced the quality of chemical plating.We think that its bonding force of plating of giving of copper pyrophosphate solution displacement copper is not so good as to adopt cyanide copper plating process.But the latter is accompanied by a large amount of highly toxic substance dischargings and contaminate environment.2, on the copper with Silver Nitrate or Palladous chloride activate could be on the copper layer chemical nickel plating, and the activator of the remaining trace of reactivation process can stain chemical plating fluid, can make plating bath decomposition failure soon, the precious metal salt price of original activation usefulness is just very expensive, plating bath can not use continuously in addition, and cost is increased.3, activation back plating in alkaline chemical nickel-plating, its coating phosphorus content seldom
(2)～(4), and the wear resistance of heating back coating and hardness improve along with the increase of phosphorus content
(5)4, adopt the bonding force and the corrosion resisting property of above-mentioned its coating of technology relatively poor, through atmospheric exposure coating color and peeling off after for some time.（1）
The objective of the invention is for super-plastic Zn-Al alloy parts provides a kind of chemical nickel plating surface hardening process, this technology can be improved the polishing machine of workpiece, and coating and matrix have good bonding force, and the plating piece surface hardness can reach HV 〉=600kg/mm
2
Principal character of the present invention is not need by the precious metal activation treatment, give electronickelling after, direct chemical nickel plating forms the autocatalysis process of a chemical nickel plating on nickel, and electroless plating can be carried out smoothly, invents composed as follows:
1, surperficial pre-treatment: workpiece is after oil removing and water flushing, the sand grains that adopts 100～300 μ m under 1～2.5 normal atmosphere is to the even sandblast of workpiece surface, can produce like this one have a locking action sting the erosion node, give nickel layer and can good binding be arranged thereby make with matrix.Do not clean clean greasy dirt and oxide skin in the time of simultaneously can removing superplastic forming, foaming is peeled off otherwise give nickel layer.The surface is wanted rational selective pressure and sand size during pre-treatment, because blast and sand grains too mostly can damage the surface of workpiece, thereby influences the surfaceness of coating.
2 etches: the washing back is in 0.5～2% dilute sulphuric acid, temperature be 15～30 ℃ with workpiece etch 0.1～0.5 minute, use cold rinse then, can remove the oxide compound ash of workpiece surface like this, make it that active surface be arranged, for the deposition of giving nickel plating provides advantageous conditions.
3, give electronickelling: adopt big electric current to dash plating earlier, current density is 2～6A/dm
2, 3～7 minutes time, dropping to current density then is 0.5～2A/dm
2Electroplate, electroplating time is 5～15 minutes, and bath temperature is 45～65 ℃, and PH is 7～8, and electroplate liquid consists of:
Single nickel salt 0.35～0.70 mol
Trisodium Citrate 0.40～0.80 mol
Boric acid 0.30～0.70 mol
Sodium-chlor 0.20～0.50 mol
Adopt big electric current to dash plating and can make nickel nucleation rate when the Zn-Al alloy surface deposition surpass grain growth speed, thereby can obtain fine and close thin brilliant nickel layer, then can make on the crystal grain of nickel in nucleation in the plating of adopting little electric current on such workpiece surface again and grow up.Current density is unfavorable for the workpiece nucleation at complicated shape for a short time, but the overheated blackout that can cause workpiece surface for a long time towards plating of super-high-current, therefore the control towards the plating time also is very important.In addition, the electroplating time that dashes after plating is even more important, and electroplating time is short, it is thin to give coating, and plating bath will infiltrate gives the matrix of corrosion of coating Zn-Al alloy during electroless plating, and it is long to give the plating time, the blocked up both uneconomical coating that also can make of coating increases stress, thereby also has influence on the bonding force of coating with matrix.
4, workpiece can drop into plating in the chemical plating fluid after the water flushing, 80～90 ℃ of its temperature, and PH is 4.5～5, and sedimentation velocity is 20～25 μ m/ hours, and chemical plating fluid is composed as follows:
Single nickel salt 0.07～0.12 mol
Sodium-acetate 0.10～0.20 mol
Inferior sodium phosphate 0.15～0.23 mol
F-7 rate accelerating material(RAM) 10～32 grams per liters
(its major ingredient is: Succinic Acid, Padil, lactic mixt)
When chemical plating fluid when PH is 4.5～5, guaranteed the phosphorus content ≈ 7% of coating, thereby improved the hardness and the wear resistance and corrosion resistance of coating, its microhardness HV 〉=600kg/mm
2Add F-7 rate accelerating material(RAM) (its major ingredient is: Succinic Acid, Padil, lactic mixt) plating under selected temperature, obtained higher sedimentation velocity 20～25 μ m/ hours.Adopt the workpiece of the above-mentioned Zn-Al alloy that plates to peel off at 2～3 hours non-scales of 160 ℃ of heating, the corrosion of anti-sulfuric acid, acetic acid and strong acid is in the medium-term and long-term exposure of atmosphere nondiscoloration.Whole stable technical process, plating bath can use continuously.No highly toxic substance discharging, free from environmental pollution, be fit to industrial-scale production.
Embodiment 1: textile industry is with super-plastic Zn-Al alloy spin groove drum, doff.
1, the groove drum after the oil removing, doff are cleaned up carries out sandblast.Sand grains: 200 μ m blast: 1.5 normal atmosphere.
2, loading onto the electrode special bar, to place 1% sulfuric acid to soak 15 seconds temperature be 30 ℃.
3, give electronickelling, bath temperature is 65 ℃, and dashing the plating electric current is 4.5A/dm
2,, reduce to 1.3A/dm then towards 7 minutes plating time
2Continue to electroplate 7 minutes, plating bath PH is 7.5, and plating bath is formed:
Single nickel salt 0.4 mol
Boric acid 0.35 mol
Trisodium Citrate 0.5 mol
Sodium-chlor 0.3 mol
4, clean up after the plating, place electroless nickel bath to carry out chemical nickel plating, 1 hour time, 88 ℃ of temperature, PH is 5, chemical plating bath is composed as follows:
Single nickel salt 0.1 mol
Inferior sodium phosphate 0.2 mol
Sodium-acetate 0.13 mol
F-7 rate accelerating material(RAM) 20 grams per liters
(its major ingredient is: Succinic Acid, Padil, lactic mixt)
Plating is complete to place 160 ℃ to handle 2 hours groove drum, and coating does not peel off, non-scale, coating hardness HV 〉=600kg/mm
2, thickness 25 μ m.
Embodiment 2: plastics industry super-plastic Zn-Al alloy injection mold
1, mould is removed greasy dirt and cleaned up and carry out sandblast, the about 100 μ m of fineness of sand, blast is 2 normal atmosphere.
2, the mould after the sandblasting is placed 1% dilute sulphuric acid soaked 15 seconds.
3, give electronickelling, subpunch plating 5 minutes, current density 2A/dm
2, drop to 1A/dm then
2, to electroplate 10 minutes, the electroplate liquid composition is as follows:
Single nickel salt 0.35 mol
Trisodium Citrate 0.40 mol
Boric acid 0.30 mol
Sodium-chlor 0.20 mol
PH 7.2
Temperature (℃) 60
4, electroless plating, same with enforcement 1.Difference is in pH value is transferred to 4.5, and electroless plating 2 hours, temperature are 86 ℃, and plating is finished 180 ℃ of heating 4 hours, and the coating combination is good, no peeling phenomenon.
Embodiment 3: machining super-plastic Zn-Al alloy cutting die
Chemical plating technology is identical with embodiment 2.
Bibliography
(1), Japanese metallic surface technology
The chemical nickel plating of superplasticity zinc-aluminium eutectoid alloy
The man of gold Fuji
Metallic surface technological associations of Corporation
VOL 32 89（1981）
(2), U.S. Plating
An Qutline of the chemistry involes in the
Process of catalytic Nickel deposition
from aqueous solution.G.Gutzeit
JOURNAL OF AMERTCAN ELECTROPLATERS′SOCIETY
47、63（1960）
(3), Britain TRNASACTIONS OF THE
INSTITUTE OF METAL FINISHING
The plating rates and physical properties
of electroless Nickel/Phosphorus alloy
deposits.C.Baldwin and T.E.Such
INCORPORATING ELECTRODEPOSITORS TECHNICAL
SOCIETY VOL 46 Part 2 P73 1968
(4), U.S. Plating
Residual stresses in Electroless Nickel
Plating K.Parkes and H.shah
JOURNAL OF AMERICAN ELECTROPLATERS′SOCIETY
VOL 58 NO3 P230 1971 MARCH
(5), U.S. Plating
Electroless Nickel depokited at controlled PH;mechanical properies as a function of Phosphous content J-P·Randin and H·E·Hintermann VOL54 NO·5 523（1967）MAY
Claims (5)
1, a kind of nickel chemical plating technology of super-plastic Zn-Al alloy parts is characterized in that it is made up of following operation: the pre-treatment that (1) adopts sandblast and dilute sulphuric acid etch to be done; (2) give electronickelling; (3) chemical nickel plating that carries out with following plating bath:
Single nickel salt 0.07～0.1 mol
Sodium-acetate 0.1～0.2 mol
Inferior sodium phosphate 0.15～0.23 mol
F-7 rate accelerating material(RAM) 0.16～0.30 mol
(its major ingredient is: Succinic Acid, Padil, lactic mixt)
2, according to the described nickel chemical plating technology of claim 1, it is characterized in that the sand size that adopts is 100～300 μ m in the pre-treatment, blast is 1～2.5 normal atmosphere.The dilute sulphuric acid percentage concentration that etch is used is 0.5～2%, and temperature is 15～30 ℃, and the etch time is 0.1～0.5 minute.
3,, it is characterized in that the plating bath that gives electronickelling is according to the described nickel chemical plating technology of claim 1:
Single nickel salt 0.35～0.70 mol
Boric acid 0.30～0.70 mol
Trisodium Citrate 0.40～0.80 mol
Sodium-chlor 0.20～0.50 mol
4, according to the described nickel chemical plating technology of claim 3, adopting current density earlier when it is characterized in that giving electronickelling is 2～6A/dm
2Dash plating, towards the plating time be 3～7 minutes.Dash the plating back and adopt 0.5～2A/dm
2Electric current electroplate, electroplating time is 5～15 minutes.45～65 ℃ of bath temperatures, PH are 7～8.
5, by the described nickel chemical plating technology of claim 1, the PH that it is characterized in that chemical plating fluid is 4～5, and the temperature of plating bath is 80～90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100657A CN85100657B (en) | 1985-04-01 | 1985-04-01 | Chemical nickel plating process for super-plastic zn-al alloy parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100657A CN85100657B (en) | 1985-04-01 | 1985-04-01 | Chemical nickel plating process for super-plastic zn-al alloy parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100657A true CN85100657A (en) | 1986-07-23 |
| CN85100657B CN85100657B (en) | 1987-05-13 |
Family
ID=4791335
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100657A Expired CN85100657B (en) | 1985-04-01 | 1985-04-01 | Chemical nickel plating process for super-plastic zn-al alloy parts |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410424C (en) * | 2006-03-31 | 2008-08-13 | 北京航空航天大学 | Method for coating Ni-P layer in same liquid by chemically plating and electrobath |
| CN100564595C (en) * | 2007-05-23 | 2009-12-02 | 湖北工业大学 | The method of multiple-wall carbon nanotube chemical nickel plating on surface zinc |
| CN103668351A (en) * | 2012-09-11 | 2014-03-26 | 三星电机株式会社 | Nickel plating solution and method for forming nickel plating layer using the same |
| CN103820791A (en) * | 2014-02-28 | 2014-05-28 | 上海造币有限公司 | Method for reducing annealing temperature or time of nickel-coated billet cake |
| CN109628965A (en) * | 2019-01-30 | 2019-04-16 | 云谷（固安）科技有限公司 | Metal works cleaning process |
-
1985
- 1985-04-01 CN CN85100657A patent/CN85100657B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410424C (en) * | 2006-03-31 | 2008-08-13 | 北京航空航天大学 | Method for coating Ni-P layer in same liquid by chemically plating and electrobath |
| CN100564595C (en) * | 2007-05-23 | 2009-12-02 | 湖北工业大学 | The method of multiple-wall carbon nanotube chemical nickel plating on surface zinc |
| CN103668351A (en) * | 2012-09-11 | 2014-03-26 | 三星电机株式会社 | Nickel plating solution and method for forming nickel plating layer using the same |
| CN103820791A (en) * | 2014-02-28 | 2014-05-28 | 上海造币有限公司 | Method for reducing annealing temperature or time of nickel-coated billet cake |
| CN109628965A (en) * | 2019-01-30 | 2019-04-16 | 云谷（固安）科技有限公司 | Metal works cleaning process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100657B (en) | 1987-05-13 |
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