CN101555611B - Method for electroplating nickel on surface of magnesium alloy - Google Patents

Method for electroplating nickel on surface of magnesium alloy Download PDF

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Publication number
CN101555611B
CN101555611B CN2009100668962A CN200910066896A CN101555611B CN 101555611 B CN101555611 B CN 101555611B CN 2009100668962 A CN2009100668962 A CN 2009100668962A CN 200910066896 A CN200910066896 A CN 200910066896A CN 101555611 B CN101555611 B CN 101555611B
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China
Prior art keywords
electroplating
alloy
plating
nickel
zinc
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CN2009100668962A
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CN101555611A (en
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吴化
王淮
李雪松
杨悦
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Changchun University of Technology
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Changchun University of Technology
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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

A kind of method for electroplating nickel on surface of magnesium alloy
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, easy to operate vitriol (watt plating bath) corrosion and the quality of coating problem that nickel plating brought of technology matrix.
The present invention proposes a kind of method for electroplating nickel on surface of magnesium alloy of realizing immersion plating zinc-pretreated quality of coating good stability of cyanideless electro-plating gunmetal that comprises.
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-bronze (copper-tin alloy) electroplating, 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-bronze (copper-tin alloy) electroplating adopts stannate plating bath electroplating copper tin alloy; Sulfate bath is adopted in electronickelling; In the whole process of immersion plating zinc, pre-bronze (copper-tin alloy) electroplating and electronickelling, plating bath is vibrated stirring.
Above-mentioned said surface derusting, oil removing, surface active, immersion plating zinc, electroplating copper tin alloy 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 electroplating copper tin alloy surface with matrix bond.
Above-mentioned said electroless plated zinc alloy is meant electroless plated Zinc-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-sn alloy coating 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, owing to whole process using ultrasonic stirring in immersion plating zinc, pre-bronze (copper-tin alloy) electroplating, nickel plating whole process, can guarantee the compactness and the electroplating process stability of bottom, make zinc coating, cu-sn alloy coating, the tiny densification of nickel coating crystallization, anti-bath corrosion strengthens greatly; Even adopt cheap watt plating bath, its coating also has fabulous coating 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
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the surface topography map of pre-bronze (copper-tin alloy) electroplating after adopting the inventive method to Mg alloy surface immersion plating zinc.
Fig. 2 is the surface topography map that adopts the inventive method that electronickelling is carried out on magnesium alloy bronze (copper-tin alloy) electroplating surface.
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-bronze (copper-tin alloy) electroplating, and its electroplate liquid formulation and processing condition see Table 2.Can obtain surface topography cu-sn alloy coating as shown in Figure 1 behind the pre-bronze (copper-tin alloy) electroplating.To in the watt plating bath, press the electronickelling of table 3 process implementing through the sample behind the pre-bronze (copper-tin alloy) electroplating 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 electroplating copper tin alloy solution formula 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 electroplating copper tin alloy.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 electroplating copper tin alloy is handled.
Table 5 electroplating copper tin alloy solution formula and processing condition
Table 6. electronickelling solution formula and processing condition

Claims (5)

1. method for electroplating nickel on surface of magnesium alloy that does not contain prussiate, be after Mg alloy surface rust cleaning, oil removing, surface activation process, to carry out immersion plating zinc, pre-bronze (copper-tin alloy) electroplating, re-plating nickel, it is characterized in that said immersion plating zinc is meant electroless plated pure zinc or electroless plated zinc alloy; Pre-bronze (copper-tin alloy) electroplating adopts the stannate plating bath; Sulfate bath is adopted in electronickelling; In the whole process of immersion plating zinc, pre-bronze (copper-tin alloy) electroplating and electronickelling, plating bath is vibrated stirring.
2. method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized in that said electroless plated zinc alloy is meant electroless plated Zinc-tin alloy.
3. method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized in that said stannate plating bath is a potassium stannate plating bath or for the sodium stannate plating bath or be the two mixing plating bath.
4. method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized in that said sulfate bath is the watt plating bath.
5. method for electroplating nickel on surface of magnesium alloy as claimed in claim 1 is characterized in that said vibration stirring is meant ultrasonic agitation.
CN2009100668962A 2009-05-04 2009-05-04 Method for electroplating nickel on surface of magnesium alloy Expired - Fee Related CN101555611B (en)

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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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CN101555611B true CN101555611B (en) 2011-02-02

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
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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