CN100413996C - Method of nickel sulfate solution system chemical nickel plating on magnesium alloy - Google Patents
Method of nickel sulfate solution system chemical nickel plating on magnesium alloy Download PDFInfo
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- CN100413996C CN100413996C CNB2005100480029A CN200510048002A CN100413996C CN 100413996 C CN100413996 C CN 100413996C CN B2005100480029 A CNB2005100480029 A CN B2005100480029A CN 200510048002 A CN200510048002 A CN 200510048002A CN 100413996 C CN100413996 C CN 100413996C
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- magnesium alloy
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- nickel plating
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Abstract
The present invention relates to a method of nickel sulfate solution system chemical nickel plating on magnesium alloy, which comprises the following steps: firstly, preprocessing a magnesium alloy base before plating; then, directly depositing chemical nickel plating out of a chemical nickel plating layer. The preprocessing before plating comprises two steps of acidic erosion and alkaline erosion. The chemical nickel plating layer uses nickel sulfate as main salt, sodium hypophosphite and natrium citricum as reducing agents, and ammonium hydrogen fluoride as a stabilizing agent and an accelerating agent. The present invention is suitable for making chemical nickel plating on magnesium alloy material to protect and decorate the magnesium alloy. The present invention has the advantages that production cost and pollution are reduced, and industrialization is easy to realize.
Description
Technical field:
The present invention relates to a kind of method of nickel sulfate solution system chemical nickel plating on magnesium alloy, belong to the metal corrosion and protection technical field.
Background technology:
Magnesium alloy is the density minimum in practical structural metallic materials, is 1.74g/cm
3, be 1/3 of iron and steel, 2/3 of aluminium.Because it has light weight, specific tenacity height, electro-magnetic screen function and heat conduction that shock resistance is good, good, electroconductibility is good and be easy to excellent properties such as recycling, makes magnesium and alloy thereof have broad application prospects in fields such as defence and military, traffic, communications.
Yet magnesium alloy is the highest metallic substance of chemical activity, and its standard potential is-2.37 volts.Under various envrionment conditionss, especially when chlorion existed, corrosion failure very easily took place in magnesium alloy.Will further enlarge the application of magnesium alloy on automobile and electronic product, must solve the corrosion and protection problem of magnesium alloy, magnesium alloy must carry out surface anticorrosive before use to be handled.
Surface treatment mainly adopts chemical conversion film to add organic coating, anode oxide film adds methods such as organic coating, plating and electroless plating.At Mg alloy surface metal lining coating, magnesium alloy is carried out surface modification, be one of effective ways that solve magnesium alloy corrosion prevention problem.Adding organic coating with chemical conversion film compares with the surface treatment method that anode oxide film adds organic coating, metal plating has characteristics such as can conduct electricity, can weld, thermal conductivity is good, electro-magnetic screen function is good, can be according to the different demands of product, the various metal plating of plating, satisfy the requirement of aspects such as product is corrosion-resistant, abrasion performance, high rigidity, have the texture and the outward appearance of metal simultaneously.
What the metal lining plating layer research was maximum on magnesium alloy is chemical nickel plating, and that bibliographical information is maximum is basic nickel carbonate 2NiCO
33Ni (OH)
24H
2O also has the acetic acid of employing nickel (CH as the system of main salt
3COO)
24H
2O is as the chemical nickel plating system of main salt.With the system of basic nickel carbonate as main salt, general pre-treatment is adopted and is contained chromium (CrO
3) acid etching, after the washing, with hydrofluoric acid (HF) activation, on magnesium alloy substrate, generate fluorine-containing (MgF in advance
2) protective layer, carry out direct chemical nickel plating subsequently.In nickel process, the fluorochemical protective membrane of Sheng Chenging comes off gradually in plating bath in advance, exposes fresh magnesium matrix, and chemical Ni-plating layer is deposited on the metallic matrix.The problem that this method exists is, the basic nickel carbonate molecular weight is big, and it is less relatively as the nickel of deposition of elements shared ratio in molecule, the plating bath preparation is difficulty comparatively, need with dense hydrofluoric acid basic nickel carbonate to be dissolved in advance, hydrofluoric acid corrodibility is extremely strong, and operator's safety is constituted a threat to.The existence of a large amount of fluorions causes difficulty for the sewage disposal of being discharged in the plating bath, has increased the difficulty and the cost of sewage disposal.Come off in the deposition process pre-treatment fluoride films in plating bath is suspended in the solution, worsens quality of coating, reduces plating bath work-ing life.The chrome pickle that its pre-treatment is adopted causes severe contamination to environment.
Bibliographical information adopts the stannate conversion film as bottom with the method for acetate as chemical nickel plating on the magnesium alloy of main salt, pre-treatment, and chemical nickel plating is carried out in further tin protochloride sensitization again, Palladous chloride activation, pyrophosphate salt reduction again.As main salt, nickel proportion in main molecules of salt is very little, deposit certain thickness nickel coating with nickel acetate, and the consumption of main salt is big, and depositing time is long.In addition, whole technological process step is more, is unfavorable for process control and realization of industrialization.
No matter be basic nickel carbonate as main salt or nickel acetate chemical nickel plating system as main salt, it all is new nickel chemical plating technology, can under industrialized condition, realize stably manufactured, and can plating bath steady in a long-termly use, the maintenance of plating bath and the aftertreatment of waste liquid all need further a large amount of intensive work.
Single nickel salt is as the chemical nickel plating system of main salt, and using on steel substrate has been sophisticated industrial technology both at home and abroad.Research is in the past thought, the single nickel salt chemical nickel-plating solution system that is used for the steel material surface processing is not suitable for using at Mg alloy surface, major cause is to think nickelous sulfate plating liquid heavy corrosion magnesium alloy substrate, cause a large amount of liberations of hydrogen in metallic surface, the deposition process of chemical nickel plating can't normally be carried out.
Summary of the invention:
The objective of the invention is to overcome the defective of prior art, a kind of method of new nickel sulfate solution system chemical nickel plating on magnesium alloy has been proposed, employing bimolybdate solution carries out acid etching and alkaline molybdate solution carries out alkaline etch, and magnesium alloy substrate is plated preceding pre-treatment.Adopt the main salt of single nickel salt, in nickel sulfate solution, can on magnesium alloy, realize direct chemical nickel plating depositing chemical Ni-plating layer as chemical nickel-plating solution on the magnesium alloy.
The objective of the invention is to realize: immerse magnesium alloy workpiece in the degreasing tank earlier by following technical proposals, at room temperature, in acetone reagent in degreasing under the ultrasonic wave effect after 3～5 minutes, enter in first tank and washed 1～2 minute, enter again and use deionized water wash 1～2 minute in second tank with the mobile tap water.At room temperature immerse and soaked in the acid etching liquid 1～2 minute, enter the 3rd tank, enter the 4th tank again and after 1～2 minute, at room temperature enter and soaked in the alkaline etching solution 5～8 minutes through deionized water wash through tap water washing 1～2 minute.After workpiece takes out, enter the 5th tank, enter the 6th tank again and after 1～2 minute, enter the chemical nickel plating groove, carried out chemical nickel plating 2～4 hours through deionized water wash through tap water washing 1～2 minute.Workpiece after the plating enters the 8th tank again and after 1～2 minute, takes out oven dry through the tap water washing through entering the 7th tank through mobile tap water washing 1～2 minute.
The present invention compared with prior art has the following advantages: 1, corrosion resistance of coating of the present invention is good, and is firm with matrix bond, for magnesium alloy provides favorable protection.Its electroless plating pretreatment technology, solution composition is simple, is easy to control, process stabilizing; 2, the main salt of chemical nickel plating employing of the present invention is single nickel salt, and cost is low, simple to operate, bath stability is good, is easy to safeguard; 3, in whole technological process, do not need to use the chromium element fully, can reduce pollution for environment; 4, be easy to realization of industrialization, the waste water ratio that produces in the processing is easier to handle,
Embodiment:
Be described further for the present invention below in conjunction with embodiment.
Embodiment 1
Test materials is the AZ91D magnesium alloy
1. degreasing: with acetone solvent washing, remove lubricant that general dirt, sintering adhere to, cutting agent etc. under the ultrasonic wave effect; Service temperature is a room temperature, and the time is 1～2 minute; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
2. acid etching: phosphoric acid 20ml/L, Sodium orthomolybdate 5g/L, temperature is a room temperature, the time is 1～2 minute; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
3. alkaline etch: ammonium molybdate 20g/L, sodium hydroxide 10g/L, temperature is a room temperature, the time is 1～2 minute; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
4. chemical nickel plating: will immerse through pretreated workpiece and contain single nickel salt 20g/L, inferior sodium phosphate 40g/L, Trisodium Citrate 15g/L, in the chemical nickel-plating solution of ammonium bifluoride 12g/L, controlled temperature is 85～90 ℃, pH=6～7, the treatment time is 2～4 hours, can obtain to have the nickel-phosphor alloy coating of metalluster.Coating and matrix bond are firm, and phosphorus content is 8%～10% (wt), presents amorphous structure.
Embodiment 2
Test materials is the AM60 magnesium alloy
1. degreasing: with acetone solvent washing, remove lubricant that general dirt, sintering adhere to, cutting agent etc. under the ultrasonic wave effect; Service temperature is a room temperature, and the time is 1～2 minute; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
2. acid etching: phosphatase 11 5ml/L, primary ammonium phosphate 5g/L, ammonium molybdate 8g/L, temperature is a room temperature, the time is 1～2 minute; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
3. alkaline etch: Sodium orthomolybdate 25g/L, ammoniacal liquor 20ml/L, temperature is a room temperature, the time is 2～3 minutes; Washed deionization washing 1～2 minute from the beginning 1～2 fen;
4. chemical nickel plating: will immerse through pretreated workpiece and contain single nickel salt 30g/L, inferior sodium phosphate 45g/L, Trisodium Citrate 20g/L, in the chemical nickel-plating solution of ammonium bifluoride 10g/L, controlled temperature is 82～85 ℃, pH=5.5-6.5, the treatment time is 2～4 hours, can obtain to have the nickel-phosphor alloy coating of metalluster.Coating and matrix bond are firm, and phosphorus content is 9%～11% (wt), presents amorphous structure.
Claims (1)
1. the method for a nickel sulfate solution system chemical nickel plating on magnesium alloy, this method comprises: (a) earlier magnesium alloy substrate is plated preceding pre-treatment; (b) direct chemical nickel plating then, deposit chemical Ni-plating layer, above-mentioned magnesium alloy substrate is plated preceding pre-treatment, comprise two steps of acid etching and alkaline etch, in described two steps, carry out acid erosion earlier, carry out alkaline attack again, it is characterized in that: the acid etching liquid formula that is used for acid etching contains phosphoric acid, dihydrogen phosphate and molybdate; The alkaline etch solution formula that is used for alkaline etch contains molybdate and alkali.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100480029A CN100413996C (en) | 2005-12-15 | 2005-12-15 | Method of nickel sulfate solution system chemical nickel plating on magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100480029A CN100413996C (en) | 2005-12-15 | 2005-12-15 | Method of nickel sulfate solution system chemical nickel plating on magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
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| CN1786265A CN1786265A (en) | 2006-06-14 |
| CN100413996C true CN100413996C (en) | 2008-08-27 |
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| CNB2005100480029A Expired - Fee Related CN100413996C (en) | 2005-12-15 | 2005-12-15 | Method of nickel sulfate solution system chemical nickel plating on magnesium alloy |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105779977A (en) * | 2016-02-15 | 2016-07-20 | 深圳市瑞世兴科技有限公司 | Palladium activating solution for nickel plating of magnesium alloy and nickel plating method of magnesium alloy |
| CN108914094A (en) * | 2018-07-17 | 2018-11-30 | 杭州百木表面技术有限公司 | A kind of surface treating agent of Zn-Cu-Ni alloy strip and the surface treatment method of Zn-Cu-Ni alloy strip |
| CN114045475A (en) * | 2021-10-29 | 2022-02-15 | 惠州市安泰普表面处理科技有限公司 | Preparation method of intermediate conversion layer suitable for chemical nickel plating of magnesium alloy substrate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598052A (en) * | 2004-08-02 | 2005-03-23 | 吉林大学 | Magnesium alloy chemical plating nickle solution and its plating method |
| CN1598053A (en) * | 2004-08-05 | 2005-03-23 | 湖南大学 | Plating solution of magnesium alloy nickle sulfate main salt and technology of chemical plating thereof |
| CN1603465A (en) * | 2004-08-31 | 2005-04-06 | 中国兵器工业第五九研究所 | Treatment process for synergistic fluoropolymer coating on magnesium and its alloy |
-
2005
- 2005-12-15 CN CNB2005100480029A patent/CN100413996C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598052A (en) * | 2004-08-02 | 2005-03-23 | 吉林大学 | Magnesium alloy chemical plating nickle solution and its plating method |
| CN1598053A (en) * | 2004-08-05 | 2005-03-23 | 湖南大学 | Plating solution of magnesium alloy nickle sulfate main salt and technology of chemical plating thereof |
| CN1603465A (en) * | 2004-08-31 | 2005-04-06 | 中国兵器工业第五九研究所 | Treatment process for synergistic fluoropolymer coating on magnesium and its alloy |
Non-Patent Citations (4)
| Title |
|---|
| Protective coatings on magnesium and its alloys-acriticalreview. J.E. Gray, B. Luan.Journal of Alloys and Compounds,Vol.336 . 2002 |
| Protective coatings on magnesium and its alloys-acriticalreview. J.E. Gray, B. Luan.Journal of Alloys and Compounds,Vol.336 . 2002 * |
| 以硫酸镍为主盐的镁合金化学镀镍. 李建中，邵忠财，田彦文.中国有色金属学报，第15卷第1期. 2005 |
| 以硫酸镍为主盐的镁合金化学镀镍. 李建中，邵忠财，田彦文.中国有色金属学报，第15卷第1期. 2005 * |
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