CN101555611A - Method for electroplating nickel on surface of magnesium alloy - Google Patents
Method for electroplating nickel on surface of magnesium alloy Download PDFInfo
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- CN101555611A CN101555611A CN 200910066896 CN200910066896A CN101555611A CN 101555611 A CN101555611 A CN 101555611A CN 200910066896 CN200910066896 CN 200910066896 CN 200910066896 A CN200910066896 A CN 200910066896A CN 101555611 A CN101555611 A CN 101555611A
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Abstract
The invention discloses a method for electroplating nickel on the surface of a magnesium alloy, including the realization of hot-dip galvanizing-cyanide-free copper electroplating pretreatment. The method firstly carries out surface derusting, degreasing and surface activation treatment of the magnesium alloy, then carries out hot-dip galvanizing, adopts stannate plating solution for copper preplating, further adopts watt plating solution for nickel electroplating and adopts ultrasonic agitation during the entire process of the hot-dip galvanizing, the copper preplating and the nickel electroplating. The method does not adopt cyanide plating solution and is characterized by small and dense crystals of all the plating layers, strong anti-plating liquid corrosion and the like.
Description
Technical field
The present invention relates to a kind of Mg alloy surface anti-corrosion method, particularly relate to a kind of Mg alloy surface electric plating method.
Background technology
Magnesium alloy has that proportion is little, damping performance good, has than high specific strength, specific rigidity with than Young's modulus and heat conductivity, capability of electromagnetic shielding or the like preferably.But magnesium alloy chemical is active high, and electropotential is low, and surface film oxide is loose, causes barrier propterty low, has restricted Application of Magnesium and development.Caused the concern of people thus to magnesium alloy part surface corrosion and protection, carried out a large amount of research at aspects such as Mg alloy surface anodic oxidation, chemical conversion film, organic coating, coating surfaces, adopt particularly that method for electroplating nickel is low as a kind of cost, technology is simple, the surface coating technique of easy handling, has become the important research direction of people to magnesium alloy surface protective.
Generally to pass through the pre-treatment process to electroplating nickel on surface of magnesium alloy, to avoid the corrosion of matrix in bath solution.The pre-treatment of electronickelling at present mainly contains two kinds of processing methodes, the one, immersion plating zinc-cyanide copper plating process; The 2nd, immersion plating zinc-electro-galvanizing-copper plating process repeatedly.The former has adopted deleterious prussiate, can produce severe contamination to ecotope; Latter's electroplate liquid poor stability, the control of pyrophosphate copper plating processing parameter is strict, and quality of coating stability is very responsive to it, for the operator makes troubles.Carry out nickel plating with fluoroborate or sulfamate plating bath again after pre-treatment is finished, avoid adopting cheapness, simple, the easy to operate vitriol (watt plating bath) of technology nickel plating brought to quality problems such as the corrosion of matrix and coating crystallization are thick.
The present invention proposes and realize immersion plating zinc-non-cyanide copper electroplating pre-treatment, the method for electroplating nickel on surface of magnesium alloy that nickel layer quality stability is good a kind of comprising.
Summary of the invention
A kind of method for electroplating nickel on surface of magnesium alloy that does not contain prussiate provided by the invention is to carry out immersion plating zinc, pre-copper facing, re-plating nickel after Mg alloy surface rust cleaning, oil removing, surface activation process.Wherein said immersion plating zinc is meant electroless plated pure zinc or electroless plated zinc alloy; Pre-copper facing adopts the stannate plating bath to electroplate fine copper or electro-coppering alloy; Sulfate bath is adopted in electronickelling; In the whole process of immersion plating zinc, pre-copper facing and electronickelling, plating bath is vibrated stirring.
Above-mentioned said surface derusting, oil removing, surface active, immersion plating zinc, electro-coppering are plating pretreatment, purpose is to obtain can carrying out in electroplate liquid the sedimentary cathode surface layer of normal electrical, avoid the corrosion of matrix in the electronickelling tank liquor, make electronickelling form even, tiny densification of crystallization and the nickel coating good on the electro-coppering surface with matrix bond.
Above-mentioned said electroless plated zinc alloy is meant electroless plated Zinc-tin alloy.
Above-mentioned said employing stannate plating bath electro-coppering alloy is meant at stannate plating bath electroplating copper tin alloy.
Above-mentioned said stannate plating bath is a potassium stannate plating bath or for the sodium stannate plating bath or be the two mixing plating bath.
Above-mentioned said sulfate bath is the watt plating bath.
Above-mentioned said vibration is stirred and is meant induction stirring or ultrasonic agitation.
Principle of the present invention is: by pre-treatment, improve the standard potential of Mg alloy surface gradually :-2.37 (Mg) →-0.762 (Zn) →+0.337 (Cu).Protected magnesium alloy substrate not corroded by bath solution, and formed the good Cu alloy layer of conductivity, electroplating technology is implemented electronickelling routinely.Adopt ultrasonic stirring, obtained surperficial evenly, the tiny densification of crystallization, with the good electrolytic coating of matrix bond.
Characteristics of the present invention are:
1, in present method implementation process, do not adopt the prussiate plating bath that human body and environment is had serious harm and pollution.
2, since in immersion plating zinc, pre-copper facing, nickel plating whole process the whole process using ultrasonic stirring, can guarantee the compactness and the electroplating process stability of bottom, make zinc coating, copper coating, the tiny densification of nickel coating crystallization, anti-bath corrosion strengthens greatly; Even adopt cheap watt plating bath, its nickel layer also has fabulous compactness and erosion resistance.
3, in the invention process process, all treatment soln of employing (pre-treatment, preplating bottom, electronickelling) are light, the cheap regular solution of environmental pollution.And simple, the easy-operating characteristics of technology are arranged.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a pre-copper-plated surface topography map after adopting the inventive method to Mg alloy surface immersion plating zinc.
Fig. 2 is the surface topography map that adopts the inventive method the magnesium alloy copper coatings to be carried out electronickelling.
Fig. 3 is the X-ray diffractogram after adopting the inventive method to electroplating nickel on surface of magnesium alloy.
Embodiment
Enforcement with sample adopt specification be the AZ91D magnesium alloy of 30mm * 20mm * 2mm as electroplating cathode, through 240#～600# coated abrasive working, and carry out conventional alkali oil removing, sour processing of rust removing.
1, embodiment one
It is that 40%HF handled 10 minutes that above-mentioned sample is placed under the room temperature concentration.Obtain having after certain chemically active Mg alloy surface, carry out immersion plating zinc and handle.Treatment soln prescription and technology see Table 1.
Table 1 soaks the prescription and the processing condition of galvanizing flux
Sample behind the immersion plating zinc is implemented pre-copper facing, and its electroplate liquid formulation and processing condition see Table 2.Can obtain surface topography copper coating as shown in Figure 1 after the pre-copper facing.To in the watt plating bath, press the electronickelling of table 3 process implementing through the sample after the pre-copper facing again.Can obtain surface topography nickel coating as shown in Figure 2 after the electronickelling, and prove that through X-ray diffraction detection (as shown in Figure 3) its surface is entirely metallic nickel.
Table 2 copper electroplating solution prescription and processing condition
Table 3 electronickelling solution formula and processing condition
2, embodiment two
Is among the 40%HF with above-mentioned standby sample in concentration, handles 5 minutes under the room temperature.Obtain having after certain chemically active Mg alloy surface, carry out immersion plating zinc and handle.Treatment soln prescription and technology see Table 4.
Table 4 soaks the prescription and the processing condition of galvanizing flux
Sample behind the immersion plating zinc is implemented electro-coppering.Electroplate liquid formulation and processing condition see Table 5.To in the watt plating bath, press the electronickelling of table 6 process implementing through the sample that electro-coppering is handled.
Table 5 copper electroplating solution prescription and processing condition
Table 6. electronickelling solution formula and processing condition
Claims (6)
1, a kind of method for electroplating nickel on surface of magnesium alloy that does not contain prussiate is to carry out immersion plating zinc, pre-copper facing, re-plating nickel after Mg alloy surface rust cleaning, oil removing, surface activation process.It is characterized by said immersion plating zinc and be meant electroless plated pure zinc or electroless plated zinc alloy; Pre-copper facing adopts the stannate plating bath to electroplate fine copper or electro-coppering alloy; Sulfate bath is adopted in electronickelling; In the whole process of immersion plating zinc, pre-copper facing and electronickelling, plating bath is vibrated stirring.
2, method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized by said electroless plated zinc alloy and is meant electroless plated Zinc-tin alloy.
3, method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized by said employing stannate plating bath electro-coppering alloy and is meant with stannate plating bath electroplating copper tin alloy.
4,, it is characterized by said stannate plating bath and be the potassium stannate plating bath or for the sodium stannate plating bath or be the two mixing plating bath as claim 1,3 described method for electroplating nickel on surface of magnesium alloy.
5, the method for electroplating nickel on surface of magnesium alloy of stating as claim 1, it is characterized by said sulfate bath is a watt plating bath.
6, method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized by said vibration stirring and is meant ultrasonic agitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100668962A CN101555611B (en) | 2009-05-04 | 2009-05-04 | Method for electroplating nickel on surface of magnesium alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100668962A CN101555611B (en) | 2009-05-04 | 2009-05-04 | Method for electroplating nickel on surface of magnesium alloy |
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| Publication Number | Publication Date |
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| CN101555611A true CN101555611A (en) | 2009-10-14 |
| CN101555611B CN101555611B (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100668962A Expired - Fee Related CN101555611B (en) | 2009-05-04 | 2009-05-04 | Method for electroplating nickel on surface of magnesium alloy |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103320791A (en) * | 2013-06-27 | 2013-09-25 | 开平市中铝实业有限公司 | Method for electroplating aluminum alloy automobile hub |
| CN104099648A (en) * | 2014-07-08 | 2014-10-15 | 滨中元川金属制品（昆山）有限公司 | Salt fog resistant nickel plating process |
| CN105543917A (en) * | 2016-01-05 | 2016-05-04 | 张颖 | Double-bottoming electroplating method for nickel-plating magnesium alloy hub |
| CN105839158A (en) * | 2016-05-19 | 2016-08-10 | 苏州市美能五金镀饰有限公司 | Continuous electroplating technology |
| CN107868967A (en) * | 2017-11-07 | 2018-04-03 | 东莞宜安科技股份有限公司 | A kind of magnesium alloy plate handling process and its obtained magnesium alloy plate |
-
2009
- 2009-05-04 CN CN2009100668962A patent/CN101555611B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103320791A (en) * | 2013-06-27 | 2013-09-25 | 开平市中铝实业有限公司 | Method for electroplating aluminum alloy automobile hub |
| CN104099648A (en) * | 2014-07-08 | 2014-10-15 | 滨中元川金属制品（昆山）有限公司 | Salt fog resistant nickel plating process |
| CN105543917A (en) * | 2016-01-05 | 2016-05-04 | 张颖 | Double-bottoming electroplating method for nickel-plating magnesium alloy hub |
| CN105839158A (en) * | 2016-05-19 | 2016-08-10 | 苏州市美能五金镀饰有限公司 | Continuous electroplating technology |
| CN107868967A (en) * | 2017-11-07 | 2018-04-03 | 东莞宜安科技股份有限公司 | A kind of magnesium alloy plate handling process and its obtained magnesium alloy plate |
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| Publication number | Publication date |
|---|---|
| CN101555611B (en) | 2011-02-02 |
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Granted publication date: 20110202 Termination date: 20120504 |