CN105714346A - Electroplating process for zinc alloy - Google Patents
Electroplating process for zinc alloy Download PDFInfo
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- CN105714346A CN105714346A CN201410723677.8A CN201410723677A CN105714346A CN 105714346 A CN105714346 A CN 105714346A CN 201410723677 A CN201410723677 A CN 201410723677A CN 105714346 A CN105714346 A CN 105714346A
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Abstract
The invention discloses an electroplating process for zinc alloy. The electroplating process is characterized by comprising the following steps: 1) polishing, wherein a finished zinc alloy die-casting unavoidably has flashes, burrs, impressions and the like and has to undergo polishing so as to obtain good appearance; 2) cold wax removal; 3) ultrasonic wax removal; 4) ultrasonic oil removal, wherein the zinc alloy can directly undergo electrolysis for oil removal if the surface of the zinc alloy is not full of oil stains, good ultrasonic oil removal effect can be obtained for parts with a great number of oil stains, complicated shapes, grooves or blind holes, and the pH value of oil removing powder should not be too high because strong base exerts fast dissolving effect on aluminum, which leads to dissolving-out of shrinkage cavities in the surfaces of the parts, and the shrinkage cavities influence bonding force if not thoroughly cleaned in the process of electroplating; 5) oil removal through electrolysis of a negative electrode; 6) oil removal through electrolysis of a positive electrode; and 7) activation, wherein the zinc alloy is normally activated in a hydrofluoric acid solution or in a hydrofluoric acid-sulfuric acid solution, activation salt is also commercially available, and since zinc is amphoteric metal and is prone to dissolving and corrosion in strong acid and strong base, activation is normally carried out in weak acid.
Description
Technical field
The present invention relates to a kind of Zinc alloy electroplating technique.
Background technology
Kirsite is to add other elementary composition alloys based on zinc.The alloying element often added has the Low Temperature Zn alloys such as aluminum, copper, magnesium, cadmium, lead, titanium.Kirsite fusing point is low, good fluidity, easy melting welding, soldering and plastic working, corrosion-resistant in an atmosphere, and maimed material is easy to reclaim and remelting；But creep strength is low, natrual ageing is easily occurred to cause change in size.Prepared by fusion method, die casting or pressure processing are become a useful person.
The electroplating technology of current kirsite is fairly simple, also without unified specification, it does not have unified standard, the electroplating technology quality causing the kirsite of production is uneven, a lot of operations that repeat also make under production efficiency, increase the work burden of workman, make the competitiveness of product in market not high simultaneously.For some operators just entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, in some instances it may even be possible to cause serious consequence.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of Zinc alloy electroplating technique, and this electroplating process is simple, and electroplating effect is good.
For achieving the above object, the invention provides a kind of Zinc alloy electroplating technique, it is characterised in that, comprise the steps, 1) polishing zinc alloy diecasting finished product inevitably has the phenomenons such as overlap, burr, impression, needs before plating, through grinding and polishing optical processing, to obtain good outward appearance；
2) after the polishing of cold elimination wax kirsite, the buffing wax of residual is relatively more, and in Wax removal water, scavenging period is long easily causes corrosion, so preferably there being cold de-technique together before ultrasound wave, first wax, greasy dirt being partly dissolved and being softened；
3) PH of ultrasound wave wax removing Wax removal water and temperature should not be too high, and zinc alloy surface is otherwise easily formed poroid corrosion；Temperature is high, and wax removing effect is affirmed；If material property can be grasped, it is possible to adopt the technique between high temperature, short time to process；
4) if ultrasonic oil removal zinc alloy surface greasy dirt is not weigh very much, it is possible to Direct Electrolysis oil removing；If greasy dirt part relatively more or complex-shaped, fluted, blind hole utilizes ultrasonic oil removal effective；The PH of degreasing powder can not be too high, because highly basic is fast to the dissolving of aluminum, piece surface meeting dissolution shrinkage cavity, these shrinkage cavities do not wash clean clearly in electroplating process will affect adhesion；
5) the catholyte oil removing of catholyte oil removing kirsite must use in the scope of technique, and PH is high, temperature is high, electric current is high, zinc alloy surface all can be produced corrosion by concentration height, affects the adhesion of subsequent technique；During catholyte, negative electrode generation reduction reaction liberation of hydrogen, be conducive to the dissolving to oil film, but electric current too high can not be typically in 3 ~ ~ 5A/dm2, electric current height liberation of hydrogen seriously can cause part to ooze hydrogen phenomenon, affects the adhesion of subsequent electroplating process；Anode generation oxidation reaction, if the not corrosion-resistant meeting of anode causes anodic solution, so anode should use corrosion resistant plate or stainless (steel) wire；If anode selection is improper, anodic attack rear section dissolving metal, these metal ions deposit precipitation on negative electrode, can form loose floating ash phenomenon, have a strong impact on plating adhesion；
6) anode electrolysis oil removing in order to reduce after making negative electrode defat floating ash, black film phenomenon and reduce catholyte ooze hydrogen phenomenon, after catholyte oil removing, advise doing the short time anode electrolysis oil removing of (30 ~ ~ 60 seconds)；The purpose of anode electrolysis oil removing, is in that increase the adhesive force of coating and reduce foaming；Artware after oil removing must be carried out rapidly, then activates, and the time as shelved in water or in air is longer, speckle occurs or grow dim after causing plating；Whether oil removing is clean, and the simplest method of inspection is after part oil removing, washing → acid activation → washing, if the clean piece surface of oil removing forms the hydrophilic film of one layer of moistening after acid activation is washed；Oil removing not clean surface can not form uniform moisture film, has extension water phenomenon；
7) activated zinc alloy is typically in Fluohydric acid. or Fluohydric acid. sulfuric acid solution to activate, also commercially available activator salt；Zinc is amphoteric metal, very easily dissolved corrosion in strong acid and highly basic, so activation is typically in weak acid to carry out.
The invention has the beneficial effects as follows: electroplating process of the present invention is simple, and electroplating effect is good.
Detailed description of the invention
Technical scheme disclosed by the invention is a kind of Zinc alloy electroplating technique, comprises the steps, 1) polishing zinc alloy diecasting finished product inevitably has the phenomenons such as overlap, burr, impression, needs before plating, through grinding and polishing optical processing, good outward appearance to be obtained；
2) after the polishing of cold elimination wax kirsite, the buffing wax of residual is relatively more, and in Wax removal water, scavenging period is long easily causes corrosion, so preferably there being cold de-technique together before ultrasound wave, first wax, greasy dirt being partly dissolved and being softened；
3) PH of ultrasound wave wax removing Wax removal water and temperature should not be too high, and zinc alloy surface is otherwise easily formed poroid corrosion；Temperature is high, and wax removing effect is affirmed；If material property can be grasped, it is possible to adopt the technique between high temperature, short time to process；
4) if ultrasonic oil removal zinc alloy surface greasy dirt is not weigh very much, it is possible to Direct Electrolysis oil removing；If greasy dirt part relatively more or complex-shaped, fluted, blind hole utilizes ultrasonic oil removal effective；The PH of degreasing powder can not be too high, because highly basic is fast to the dissolving of aluminum, piece surface meeting dissolution shrinkage cavity, these shrinkage cavities do not wash clean clearly in electroplating process will affect adhesion；
5) the catholyte oil removing of catholyte oil removing kirsite must use in the scope of technique, and PH is high, temperature is high, electric current is high, zinc alloy surface all can be produced corrosion by concentration height, affects the adhesion of subsequent technique；During catholyte, negative electrode generation reduction reaction liberation of hydrogen, be conducive to the dissolving to oil film, but electric current too high can not be typically in 3 ~ ~ 5A/dm2, electric current height liberation of hydrogen seriously can cause part to ooze hydrogen phenomenon, affects the adhesion of subsequent electroplating process；Anode generation oxidation reaction, if the not corrosion-resistant meeting of anode causes anodic solution, so anode should use corrosion resistant plate or stainless (steel) wire；If anode selection is improper, anodic attack rear section dissolving metal, these metal ions deposit precipitation on negative electrode, can form loose floating ash phenomenon, have a strong impact on plating adhesion；
6) anode electrolysis oil removing in order to reduce after making negative electrode defat floating ash, black film phenomenon and reduce catholyte ooze hydrogen phenomenon, after catholyte oil removing, advise doing the short time anode electrolysis oil removing of (30 ~ ~ 60 seconds)；The purpose of anode electrolysis oil removing, is in that increase the adhesive force of coating and reduce foaming；Artware after oil removing must be carried out rapidly, then activates, and the time as shelved in water or in air is longer, speckle occurs or grow dim after causing plating；Whether oil removing is clean, and the simplest method of inspection is after part oil removing, washing → acid activation → washing, if the clean piece surface of oil removing forms the hydrophilic film of one layer of moistening after acid activation is washed；Oil removing not clean surface can not form uniform moisture film, has extension water phenomenon；
7) activated zinc alloy is typically in Fluohydric acid. or Fluohydric acid. sulfuric acid solution to activate, also commercially available activator salt；Zinc is amphoteric metal, very easily dissolved corrosion in strong acid and highly basic, so activation is typically in weak acid to carry out.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (1)
1. a Zinc alloy electroplating technique, it is characterised in that comprise the steps, 1) polishing zinc alloy diecasting finished product inevitably have the phenomenons such as overlap, burr, impression, need before plating, through grinding and polishing optical processing, good outward appearance to be obtained；
2) after the polishing of cold elimination wax kirsite, the buffing wax of residual is relatively more, and in Wax removal water, scavenging period is long easily causes corrosion, so preferably there being cold de-technique together before ultrasound wave, first wax, greasy dirt being partly dissolved and being softened；3) PH of ultrasound wave wax removing Wax removal water and temperature should not be too high, and zinc alloy surface is otherwise easily formed poroid corrosion；Temperature is high, and wax removing effect is affirmed；If material property can be grasped, it is possible to adopt the technique between high temperature, short time to process；4) if ultrasonic oil removal zinc alloy surface greasy dirt is not weigh very much, it is possible to Direct Electrolysis oil removing；If greasy dirt part relatively more or complex-shaped, fluted, blind hole utilizes ultrasonic oil removal effective；The PH of degreasing powder can not be too high, because highly basic is fast to the dissolving of aluminum, piece surface meeting dissolution shrinkage cavity, these shrinkage cavities do not wash clean clearly in electroplating process will affect adhesion；5) the catholyte oil removing of catholyte oil removing kirsite must use in the scope of technique, and PH is high, temperature is high, electric current is high, zinc alloy surface all can be produced corrosion by concentration height, affects the adhesion of subsequent technique；During catholyte, negative electrode generation reduction reaction liberation of hydrogen, be conducive to the dissolving to oil film, but electric current too high can not be typically in 3 ~ ~ 5A/dm2, electric current height liberation of hydrogen seriously can cause part to ooze hydrogen phenomenon, affects the adhesion of subsequent electroplating process；Anode generation oxidation reaction, if the not corrosion-resistant meeting of anode causes anodic solution, so anode should use corrosion resistant plate or stainless (steel) wire；If anode selection is improper, anodic attack rear section dissolving metal, these metal ions deposit precipitation on negative electrode, can form loose floating ash phenomenon, have a strong impact on plating adhesion；6) anode electrolysis oil removing in order to reduce after making negative electrode defat floating ash, black film phenomenon and reduce catholyte ooze hydrogen phenomenon, after catholyte oil removing, advise doing the short time anode electrolysis oil removing of (30 ~ ~ 60 seconds)；The purpose of anode electrolysis oil removing, is in that increase the adhesive force of coating and reduce foaming；Artware after oil removing must be carried out rapidly, then activates, and the time as shelved in water or in air is longer, speckle occurs or grow dim after causing plating；Whether oil removing is clean, and the simplest method of inspection is after part oil removing, washing → acid activation → washing, if the clean piece surface of oil removing forms the hydrophilic film of one layer of moistening after acid activation is washed；Oil removing not clean surface can not form uniform moisture film, has extension water phenomenon；7) activated zinc alloy is typically in Fluohydric acid. or Fluohydric acid. sulfuric acid solution to activate, also commercially available activator salt；Zinc is amphoteric metal, very easily dissolved corrosion in strong acid and highly basic, so activation is typically in weak acid to carry out.
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| CN201410723677.8A CN105714346A (en) | 2014-12-04 | 2014-12-04 | Electroplating process for zinc alloy |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106400011A (en) * | 2016-09-18 | 2017-02-15 | 惠州Tcl移动通信有限公司 | Dark grey zinc alloy surface treatment method combining AF coating |
| CN107620116A (en) * | 2017-11-03 | 2018-01-23 | 安徽新合富力科技有限公司 | A kind of powder metallurgy zirconium-base alloy surface treatment method |
| CN108406448A (en) * | 2018-03-15 | 2018-08-17 | 东莞港星金属制品有限公司 | The polishing treatment technique before pearl chromium is electroplated in coffee machine kirsite handle |
| CN108456902A (en) * | 2018-04-23 | 2018-08-28 | 江苏澳光电子有限公司 | A kind of electroplating technology |
| CN109778270A (en) * | 2019-03-18 | 2019-05-21 | 杭州埃迷丽珠宝有限公司 | Mist gold process is electroplated |
| CN110614480A (en) * | 2018-06-20 | 2019-12-27 | 东莞市亿杰五金制品有限公司 | USB flash disk and manufacturing method thereof |
| CN113818070A (en) * | 2021-09-05 | 2021-12-21 | 白林森 | Aluminum alloy surface treatment method |
| CN114887983A (en) * | 2022-06-17 | 2022-08-12 | 深圳市粤通科技有限公司 | Oil removing method for electronic product before electroplating |
-
2014
- 2014-12-04 CN CN201410723677.8A patent/CN105714346A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106400011A (en) * | 2016-09-18 | 2017-02-15 | 惠州Tcl移动通信有限公司 | Dark grey zinc alloy surface treatment method combining AF coating |
| CN107620116A (en) * | 2017-11-03 | 2018-01-23 | 安徽新合富力科技有限公司 | A kind of powder metallurgy zirconium-base alloy surface treatment method |
| CN108406448A (en) * | 2018-03-15 | 2018-08-17 | 东莞港星金属制品有限公司 | The polishing treatment technique before pearl chromium is electroplated in coffee machine kirsite handle |
| CN108456902A (en) * | 2018-04-23 | 2018-08-28 | 江苏澳光电子有限公司 | A kind of electroplating technology |
| CN110614480A (en) * | 2018-06-20 | 2019-12-27 | 东莞市亿杰五金制品有限公司 | USB flash disk and manufacturing method thereof |
| CN109778270A (en) * | 2019-03-18 | 2019-05-21 | 杭州埃迷丽珠宝有限公司 | Mist gold process is electroplated |
| CN113818070A (en) * | 2021-09-05 | 2021-12-21 | 白林森 | Aluminum alloy surface treatment method |
| CN113818070B (en) * | 2021-09-05 | 2023-09-19 | 重庆哈斯特铝板带有限公司 | Aluminum alloy surface treatment method |
| CN114887983A (en) * | 2022-06-17 | 2022-08-12 | 深圳市粤通科技有限公司 | Oil removing method for electronic product before electroplating |
| CN114887983B (en) * | 2022-06-17 | 2023-10-13 | 深圳市粤通科技有限公司 | Deoiling method for electronic product before electroplating |
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Application publication date: 20160629 |