CN103938194A - Chemical zinc dipping solution for electroplating copper on surface of magnesium alloy shell body - Google Patents
Chemical zinc dipping solution for electroplating copper on surface of magnesium alloy shell body Download PDFInfo
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- CN103938194A CN103938194A CN201310218149.2A CN201310218149A CN103938194A CN 103938194 A CN103938194 A CN 103938194A CN 201310218149 A CN201310218149 A CN 201310218149A CN 103938194 A CN103938194 A CN 103938194A
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- magnesium alloy
- immersion liquid
- alloy shell
- dipping solution
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Abstract
The invention discloses a chemical zinc dipping solution for electroplating copper on the surface of a magnesium alloy shell body. The zinc dipping solution comprises 32-36 g/L of ZnSO4.7H2O, 160-170 g/L of Na4P2O7.10H2O, 10-12 g/L of NaF, 6-8 g/L of KF, 8-12 g/L of Na2CO3, 2-3 g/L of NiSO4, 15-18 g/L of phosphoric acid, and the balance water. Through adjustment of the zinc dipping solution components, the defects of the prior art are overcome, so that the binding force of a plating layer and a matrix is better.
Description
Technical field
The present invention relates to electroplating technology field, the chemistry that relates in particular to the copper facing of a kind of magnesium alloy shell surface electrical soaks zinc immersion liquid.
Background technology
The thermal diffusivity of magnesium alloy is not only high than plastics, and is better than aluminium alloy, and the thermal diffusivity of magnesium alloy is 3.79 × 10
-5m
2ps, the thermal diffusivity of aluminium alloy is 3.64 × 10
-5m
2ps, and the thermal diffusivity of engineering plastics is 0.The heating of magnesium alloy is faster than aluminium alloy with heat radiation, and engineering plastics cannot be compared especially.Magnesium alloy also has the performance of very high shield electromagnetic interference, is suitable for doing the shell of electronic equipment, is particularly suitable for making the shell of the products such as laptop computer, mobile phone, palm PC, digital camera.
Magnesium alloy has the function of light durable, damping, shielding in a word, and specific tenacity is high, be easy to recycling, cheap feature, can be widely used in the industrial circles such as defence and military, communications and transportation, opticinstrument and electron device.
The subject matter that affects magnesium alloy application is the solidity to corrosion problem of magnesium alloy, and because the current potential of magnesium is very negative, solidity to corrosion is under certain conditions poor, and its range of application is very limited.In order to make full use of, magnesium alloy density is little, the feature of high specific strength and specific rigidity, people are on the one hand constantly improving the solidity to corrosion of magnesium alloy from the aspect such as alloying, thermal treatment, be exactly on the other hand by process for protecting surface seek to improve magnesium alloy anti-corrosion by way of.
There is much technique on magnesium and Mg alloy surface, to form coat, comprise plating, electroless plating, conversion film, anodic oxidation, organic coating, vapor deposition layer etc.Wherein simple effective method is exactly the metal or alloy that plates one deck desired properties by electrochemical method on magnesium and magnesium alloy substrate the most, electroplates.The object that magnesium and Mg alloy surface are electroplated has two: the one, and protection, the 2nd, attractive in appearance, magnesium and Mg alloy surface have protecting decorative coating.Magnesium after plating and magnesium-alloy material are mainly used on the component of high-speed moving object and need to carry on the component of goods and portable product, wherein first-selected Application Areas is the industries such as automobile, motorcycle and bike, next is portable type electronic product, as notebook computer, mobile telephone, walkman etc.
The solution magnesium of comparative maturity and Mg alloy surface corrosion-resistanting decoration treatment technology mainly contain two kinds in the world, first paint spraying, and it two is Metal platings.The former is the traditional method of current Mg alloy surface processing, but Mg alloy surface is required to use under high gloss decoration, wear-resisting, heat-resisting condition, and paint spraying can not meet the demands, and this just need to solve with metal plating.But magnesium alloy is extremely unstable in conventional bath solution, magnesium alloy member can not directly enter tank liquor and electroplate.Conventionally need to carry out pre-treatment to magnesium and Mg alloy surface, then can electroplate with conventional, reach the object to magnesium alloy surface protective decoration.
Magnesium and magnesium alloy plating carry out the standard method that the main U.S. ASTM of employing recommends of pretreated method both at home and abroad at present, are the zinc methods of soaking of Dow company exploitation, and its pre-treatment has adopted soaks zinc and cyanide copper plating technique.Not only complex process of this technology, and adopted poisonous prussiate.United States Patent (USP) 6068938 has been described pyrophosphate electroplating copper after employing electro-galvanizing and has been replaced cyanide electroplating; Domestic also have the pyrophosphate salt of employing to replace prussiate technology; Japanese Patent 59050194 is described after magnesium alloy pre-treatment, adopts the plating solution that contains silicate in the time of copper facing.The homogeneity of above-mentioned these technique electro-coppering coating, planarization and not very good with aspects such as the bonding forces of metallic matrix.
Before electro-coppering, conventionally need dip-galvanizing, this processing has important impact to follow-up copper facing.
Summary of the invention
The chemistry that the object of the invention is to propose the copper facing of a kind of magnesium alloy shell surface electrical soaks zinc immersion liquid, by the adjustment to zincate solution immersion liquid component, overcomes the defect of prior art, makes the bonding force of coating and matrix better.
For reaching this object, the present invention by the following technical solutions:
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o32-36g/L, Na
4p
2o
710H
2o160-170g/L, NaF10-12g/L, KF6-8g/L, Na
2cO
38-12g/L, NiSO
42-3g/L, phosphatase 11 5-18g/L, surplus is water.
Preferably, described zincate solution immersion liquid consists of: ZnSO
47H
2o33-35g/L, Na
4p
2o
710H
2o163-167g/L, NaF10.5-11.5g/L, KF6.5-7.5g/L, Na
2cO
39-11g/L, NiSO
42.3-2.7g/L, phosphatase 11 6-17g/L, surplus is water.
Most preferably, described zincate solution immersion liquid consists of: ZnSO
47H
2o34g/L, Na
4p
2o
710H
2o165g/L, NaF11.0g/L, KF7.0g/L, Na
2cO
310g/L, NiSO
42.5g/L, phosphatase 11 6.5g/L, surplus is water.
The applied electroplating technology step of above-mentioned plating solution can be: 1) cleans: under the condition of 65-75 DEG C, Mg alloy castings is soaked in alkaline wash to 8-10min, alkali lye consists of sodium hydroxide 74-76g/L, and sodium phosphate 6-8g/L, surplus is water, then washing; Under the condition of 35-45 DEG C, Mg alloy castings is soaked in tartrate to 40-60s, then washing; 2) activation: Mg alloy castings is activated in activator to 5-15min under the condition of room temperature, then washing; Activation solution consists of citric acid 165-175g/L, NaF200-210g/L, and surplus is water; 3) soak zinc alloy: under 75-85 DEG C of condition, Mg alloy castings is soaked to 10-15min in zinc alloy immersion liquid; 4) zinc-plated in advance, taking pure zinc as anode, pre-zinc-plated temperature: 35-45 DEG C, electroplating time 30-40min, current density: 2-3A/dm
2; 5) electro-coppering: electroplating technology is: pH is 8-8.5, and current density is 3-3.5A/dm
2, temperature is 35-45 DEG C.
The present invention has following technique effect:
Chemistry before plating soaks the adjustment of the composition of the zincate solution of zinc, lays a good foundation for copper facing, adopts after the zinc-plated rear re-plating copper of this technique, and the outward appearance light of the copper coating of acquisition, bonding force is good, porosity is low, and easy to maintenance.Covering power and the covering power of electroplating solution are good.Adopt the Mg alloy castings after the inventive method copper facing can directly use the bottom that also can be used as follow-up nickel plating, chromium plating.
Embodiment
Embodiment mono-
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o32g/L, Na
4p
2o
710H
2o170g/L, NaF10g/L, KF8g/L, Na
2cO
38g/L, NiSO
43g/L, phosphatase 11 5g/L, surplus is water.
Embodiment bis-
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o36g/L, Na
4p
2o
710H
2o160g/L, NaF12g/L, KF6g/L, Na
2cO
312g/L, NiSO
42g/L, phosphatase 11 8g/L, surplus is water.
Embodiment tri-
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o33g/L, Na
4p
2o
710H
2o167g/L, NaF10.5g/L, KF7.5g/L, Na
2cO
39g/L, NiSO
42.7g/L, phosphatase 11 6g/L, surplus is water.
Embodiment tetra-
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o35g/L, Na
4p
2o
710H
2o163g/L, NaF11.5g/L, KF6.5g/L, Na
2cO
311g/L, NiSO
42.3g/L, phosphatase 11 7g/L, surplus is water.
Embodiment five
The chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, and described zincate solution immersion liquid consists of: ZnSO
47H
2o34g/L, Na
4p
2o
710H
2o165g/L, NaF11.0g/L, KF7.0g/L, Na
2cO
310g/L, NiSO
42.5g/L, phosphatase 11 6.5g/L, surplus is water.
Claims (3)
1. the chemistry of magnesium alloy shell surface electrical copper facing soaks a zinc immersion liquid, it is characterized in that, described zincate solution immersion liquid consists of: ZnSO
47H
2o32-36g/L, Na
4p
2o
710H
2o160-170g/L, NaF10-12g/L, KF6-8g/L, Na
2cO
38-12g/L, NiSO
42-3g/L, phosphatase 11 5-18g/L, surplus is water.
2. the chemistry of a kind of magnesium alloy shell surface electrical as claimed in claim 1 copper facing soaks zinc immersion liquid, it is characterized in that, described zincate solution immersion liquid consists of: ZnSO
47H
2o33-35g/L, Na
4p
2o
710H
2o163-167g/L, NaF10.5-11.5g/L, KF6.5-7.5g/L, Na
2cO
39-11g/L, NiSO
42.3-2.7g/L, phosphatase 11 6-17g/L, surplus is water.
3. the chemistry of a kind of magnesium alloy shell surface electrical as claimed in claim 2 copper facing soaks zinc immersion liquid, it is characterized in that, described zincate solution immersion liquid consists of: ZnSO
47H
2o34g/L, Na
4p
2o
710H
2o165g/L, NaF11.0g/L, KF7.0g/L, Na
2cO
310g/L, NiSO
42.5g/L, phosphatase 11 6.5g/L, surplus is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310218149.2A CN103938194B (en) | 2013-06-03 | A kind of chemical zincation immersion of magnesium alloy shell electroplating surface copper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310218149.2A CN103938194B (en) | 2013-06-03 | A kind of chemical zincation immersion of magnesium alloy shell electroplating surface copper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103938194A true CN103938194A (en) | 2014-07-23 |
| CN103938194B CN103938194B (en) | 2016-11-30 |
Family
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641075A (en) * | 2004-01-18 | 2005-07-20 | 香港生产力促进局 | Magnesium and Mg alloy surface activating method and surface palting method |
| CN101275221A (en) * | 2008-05-13 | 2008-10-01 | 周学华 | Method for chemical plating nickel-phosphorus alloy on surface of magnesium alloy |
| CN101280445A (en) * | 2008-05-16 | 2008-10-08 | 广州杰赛科技股份有限公司 | Electroplating process for surface of magnesium alloy motorcycle hub |
| CN101831641A (en) * | 2010-05-17 | 2010-09-15 | 哈尔滨工程大学 | Acid zinc dipping solution of magnesium-lithium alloy and zinc dipping method |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641075A (en) * | 2004-01-18 | 2005-07-20 | 香港生产力促进局 | Magnesium and Mg alloy surface activating method and surface palting method |
| CN101275221A (en) * | 2008-05-13 | 2008-10-01 | 周学华 | Method for chemical plating nickel-phosphorus alloy on surface of magnesium alloy |
| CN101280445A (en) * | 2008-05-16 | 2008-10-08 | 广州杰赛科技股份有限公司 | Electroplating process for surface of magnesium alloy motorcycle hub |
| CN101831641A (en) * | 2010-05-17 | 2010-09-15 | 哈尔滨工程大学 | Acid zinc dipping solution of magnesium-lithium alloy and zinc dipping method |
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