CN85100593A - Preimpregnation alloy prior wear-resisting, antifriction metal that Sn-Al alloy is electroplated - Google Patents
Preimpregnation alloy prior wear-resisting, antifriction metal that Sn-Al alloy is electroplated Download PDFInfo
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- CN85100593A CN85100593A CN 85100593 CN85100593A CN85100593A CN 85100593 A CN85100593 A CN 85100593A CN 85100593 CN85100593 CN 85100593 CN 85100593 A CN85100593 A CN 85100593A CN 85100593 A CN85100593 A CN 85100593A
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- alloy
- resisting
- tin
- giving
- wear
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Abstract
Replace the high high tin-aluminum alloy of stanniferous amount to make the component of machine wear-resisting, that antifriction performance is good with the lower low-tin aluminium alloy of stanniferous amount, need electroplate wear-resisting, ware reducing coating layer at the working face of part.For obtaining good bonding force between coating and the Base Metal, the present invention adopts the method for preimpregnation Zn-Ni alloy to replace twice traditional dip galvanizing technique, obtains good result.For example electroplate the Pb-Sn alloy at low-tin aluminium alloy (stanniferous amount 6%) working-surface, surface smoothness is ▽
8, pliability test is not seen aliquation, is fallen slag until fractureing, do not have to bubble, and Hv hardness is 7-9.
Description
The invention belongs on Sn-Al alloy to give before the plating of electroplating wear-resisting, antifriction metal and soak alloy technology.
At present, industrial a large amount of use Sn-Al alloy is made various components of machine.For some wear parts, need to use the higher high tin-aluminum alloy material of stanniferous amount especially, to satisfy requirement to wear resisting property, antifriction performance and the work-ing life of component.For example, the bearing shell in automobile, the tractor oil engine generally is to be that 20% high tin-aluminum alloy material is made with the stanniferous amount.But, therefore not only cost an arm and a leg, and often supply falls short of demand on market because metallic tin standing stock on earth are less.
Therefore, expectation replaces the high high tin-aluminum alloy of stanniferous amount to come the manufacturing machine parts with the lower low-tin aluminium alloy of stanniferous amount, production cost is descended greatly, and reduced the demand to tin, helps relaxing the nervous situation of the demand-supply relation.
Because the wear resisting property and the antifriction performance of low-tin aluminium alloy are relatively poor, can not guarantee the work-ing life of mechanical part.Therefore, need on low-tin aluminium alloy, electroplate wear-resisting, antifriction performance and the work-ing life that wear-resisting, antifriction metal guarantees mechanical part.For example, electroplating lead tin alloy on low-tin aluminium alloy is exactly an example.
As everyone knows, because aluminium and alloy thereof are very active metals, current potential is very negative, and very thin, the very fine and close oxide film of one deck is arranged in its surface; The linear expansivity of aluminium and slicker solder differs greatly simultaneously, and this gives, and lead plating tin brings very big difficulty on aluminium and alloy thereof.Desire obtains the good coating of bonding force, and key is a pre-treating technology.Among each step of pre-treating technology, principal contradiction is: the surface of activation aluminium and alloy thereof, the suitable middle layer of searching.
At present, the treatment process before aluminium and the alloy plating thereof has: soak zinc-nickel plating or cyanide copper plating method, anonizing (carrying out in phosphoric acid solution), brush plating method and electroless plating method etc.In China, industrial with the most use be the zinc-cyanide copper plating method of soaking, often the technology that adopts is:
Solvent degreasing → electrochemical deoiling → hot water wash → running water wash → etch → running water wash → soak zinc (can adopt once or secondary soaking zinc) → running water wash → cyanide copper plating → washing.This treatment process concerning fine aluminium or contain the aluminium alloy of elements such as Si, Mg, Cu, Ti, can obtain the good electrolytic coating of bonding force.
Yet concerning aluminium-Xi (6%) alloy, this treatment process is very not desirable, and find that through a large amount of experiments several shortcomings are arranged: 1. binding force of cladding material is bad, will produce phenomenons such as foaming, even decortication sometimes behind plating Pb-Sn alloy.2. the prussiate severe toxicity is restricted in the use.3. on the copper base during lead-tin alloy plating alloy, easily to the diffusion of copper layer, this will influence the surface property of Sn-Al alloy to tin in the alloy layer.
Before plating, adopt and give the method for soaking alloy, can solve the bad problem of binding force of cladding material preferably.And, owing to soak in the alloy process giving, need not use deleterious chemical substance, can not cause environmental pollution, bring great convenience for this method of use.
It is that the Zn-Ni alloy that soaks of promoting agent replaces twice traditional dip galvanizing technique that main points of the present invention are in order to acetate ion.Adopt this technology, can obtain highly polished, wear-resisting, ware reducing coating layer that bonding force is good, and eliminated the foaming phenomenon.This technology is that 6% 20% Sn-Al alloy material all has good conformability for fine aluminium, stanniferous
The major ingredient of Zn-Ni alloy solution is as follows:
Zn（CH
- 3coo）
240-100g/L
NiSO
450-90g/L
NaOH 200-300g/L
Seignette salt 80-160g/L
Sn
2+0.2-1.0g/L
Temperature 5-40 ℃
Time 0.5-2.0 minute
NiSO wherein
4Available Ni(NO3)
2Replace, content is constant.Zn(CH
- 3coo)
2Available ZnO replaces, and adds CH simultaneously
- 3coo, content is 6-80g/L.
Adopting this technology, is that 6% low-tin aluminium alloy bush material is electroplated the Pe-Sn alloy to the stanniferous amount, has obtained good effect.Through a series of test and test, obtain following result:
1. the Sn content of coating is 8-12%, and all the other are plumbous.The thickness of coating of working-surface is 15-25 μ, and the thickness of coating of steel backing is 2-3 μ.
2. coating surface smooth finish is
8Under 2 times of magnifying glasses, detect surface-defect, do not see burr and bubbling.
3. the bonding force of coating and Base Metal is carried out pliability test, fractureing up to Base Metal does not still have aliquation, falls the slag phenomenon.
4.H
VHardness is 7-9.
5.100 hour strenuous test is that the Sn-Al bearing shell of 20% no coating is compared with the stanniferous amount, bearing shell has descended 4.7 times to the abrasion loss of axle, bearing shell descended 57% from abrasion loss.
6.600 hour strenuous test and be that 20% no coating bushing is compared with the stanniferous amount, the Sn-Al that every index all is much higher than stanniferous 20% does not have coating bushing.
This process preparation method is simple, and the raw material sources of use are abundant, and are with low cost.Processing performance is reliable and stable.Be a kind of anti-attrition, effective treatment process of giving of bearing metal of on Sn-Al alloy, electroplating.
Claims (6)
1, a kind ofly electroplates on Sn-Al alloy that mill rubs, gives before the plating of antifriction metal and soak the alloy method.It is characterized in that described alloy is a Zn-Ni alloy.
2, said the giving of claim 1 soaked the alloy method.It is characterized in that describedly giving that to soak the Zn-Ni alloy method be with containing CH
- 3cooMetallic zinc as soaking one of main salt of alloy solution, use NiSO
4As the another kind of main salt that soaks alloy solution.
3, said the giving of claim 2 soaked the alloy method.Two kinds of main salt that it is characterized in that said solution can add CH with ZnO respectively
- 3cooAnd Ni(NO
3)
2Replace.
4, said the giving of claim 2 soaked the alloy method.It is characterized in that also will adding NaOH and Seignette salt in the described solution.
5, claim 4 said giving are soaked the alloy method.It is characterized in that to add in the described solution Sn of trace
2+
6, claim 5 said giving are soaked the alloy method.The temperature that it is characterized in that described solution should be 5-40 ℃, and the time of soaking alloy should be 0.5-2 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100593A CN85100593B (en) | 1985-04-01 | 1985-04-01 | Alloy pre-coating process of sn-al alloys prior to plating of wear-resisting and wear-reducing alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100593A CN85100593B (en) | 1985-04-01 | 1985-04-01 | Alloy pre-coating process of sn-al alloys prior to plating of wear-resisting and wear-reducing alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100593A true CN85100593A (en) | 1986-08-06 |
| CN85100593B CN85100593B (en) | 1988-05-11 |
Family
ID=4791290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100593A Expired CN85100593B (en) | 1985-04-01 | 1985-04-01 | Alloy pre-coating process of sn-al alloys prior to plating of wear-resisting and wear-reducing alloys |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100593B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5814078A (en) * | 1987-05-20 | 1998-09-29 | Zhou; Lin | Method and apparatus for regulating and improving the status of development and survival of living organisms |
| US6120531A (en) * | 1987-05-20 | 2000-09-19 | Micron, Technology | Physiotherapy fiber, shoes, fabric, and clothes utilizing electromagnetic energy |
-
1985
- 1985-04-01 CN CN85100593A patent/CN85100593B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5814078A (en) * | 1987-05-20 | 1998-09-29 | Zhou; Lin | Method and apparatus for regulating and improving the status of development and survival of living organisms |
| US6120531A (en) * | 1987-05-20 | 2000-09-19 | Micron, Technology | Physiotherapy fiber, shoes, fabric, and clothes utilizing electromagnetic energy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100593B (en) | 1988-05-11 |
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