CN101024877A - Magnesium alloy chemical nickel-plating method - Google Patents
Magnesium alloy chemical nickel-plating method Download PDFInfo
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- CN101024877A CN101024877A CN 200610033851 CN200610033851A CN101024877A CN 101024877 A CN101024877 A CN 101024877A CN 200610033851 CN200610033851 CN 200610033851 CN 200610033851 A CN200610033851 A CN 200610033851A CN 101024877 A CN101024877 A CN 101024877A
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- magnesium
- chemical nickel
- coating method
- alloy
- magnesium alloy
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Abstract
The invention is a Mg alloy chemical nickel plating method, comprising the steps of: 1. making sand blast treatment on the surface of Mg alloy material; 2. etching the surface of the Mg alloy material with acid; 3. chromium-free passivating the surface of the Mg alloy material, where the formula of chromium-free passivating solution comprises: potassium permanganate 0.1-10g/l; zinc dihydrogen phosphate 5-30g/l; ammonium hydrogen 10-30g/l; zinc sulfate 1-5g/l; and 4 chemcially nickeling. And the method uses chromium-free passivation process to chemically nickel the surface of the Mg alloy material, friendly to human and environment, low-cost and having excellent coating performance.
Description
Technical field
The present invention relates to a kind of process for treating surface of magnesium alloy, relate in particular to a kind of method of carrying out chemical nickel plating on the surface of magnesium alloy.
Background technology
Magnesium alloy is because proportion is little, intensity is high, and good heat conductivity has good damping shock absorption and electro-magnetic screen function simultaneously, therefore can substituted for plastic, as the shell structure part, be applied to satisfy light, thin, short, the little requirement of electronic product in the electronic products such as mobile phone, notebook computer.
Magnesium and magnesium alloy have the height chemical activity, after workpiece enters chemical nickel-plating liquid, intensive corrosion and replacement(metathesis)reaction take place, simultaneously with a large amount of liberations of hydrogen, cause coating and magnesium alloy substrate bonding force poor, the local foaming or the convex surface peeling occur, these defectives have had a strong impact on the quality of chemical plating, can not guarantee the high anti-corrosion of coating.
Magnesium alloy is very active; the surface is oxidation very easily; so conventional magnesium alloy adopts chromyl solution to carry out passivation earlier, perhaps through the cupric cyanide bottoming, is soaking zinc etc.; carry out chemical nickel plating again through after other complex process; technology mode is tediously long, and process is difficult to control, operational difficulty; and sexavalent chrome has the use that will be under an embargo of the material of great harm, chromium passivating technology to human body and environment.
Summary of the invention
The object of the present invention is to provide a kind of method of carrying out chemical nickel plating on the surface of magnesium alloy, this cost is low, and the coating performance excellence.
For achieving the above object, the invention provides a kind of magnesium-alloy chemical nickel coating method, it may further comprise the steps:
Step 1: sandblasting on the magnesium alloy materials surface;
Step 2: with acid etch magnesium alloy materials surface;
Step 3: this magnesium alloy materials surface of chromium-free deactivation;
The solution formula of chromium-free deactivation is as follows:
Potassium permanganate 0.1-10g/l;
Primary zinc phosphate 5-30g/l;
Hydrogen fluoride ammonia 10-30g/l;
Zinc sulfate 1-5g/l;
Step 4: chemical nickel plating.
The present invention has following beneficial effect: this inventive method is used non-chromium inactivating technique, and at the magnesium alloy materials chemical nickel plating on surface, this method is to the human and environment close friend, and cost is low, the coating performance excellence.
Description of drawings
Fig. 1 is the schema of magnesium-alloy chemical nickel coating method of the present invention.
Embodiment
See also Fig. 1, a kind of magnesium-alloy chemical nickel coating method, it may further comprise the steps:
Step 1: sandblasting on the magnesium alloy materials surface;
The effect of sandblasting is to remove the oil stain on surface, polishing magnesium alloy materials surface.
Step 1b: this magnesium alloy materials surface of ultrasonic cleaning;
Step 2: with oxalic acid (oxalic acid) the etching magnesium alloy materials surface of 0.5-5%;
Step 2b: this magnesium alloy materials surface of ultrasonic cleaning again;
Step 3: this magnesium alloy materials surface of chromium-free deactivation;
The solution formula of chromium-free deactivation is as follows:
Potassium permanganate 0.1-10g/l;
Primary zinc phosphate 5-30g/l;
Hydrogen fluoride ammonia 10-30g/l;
Zinc sulfate 1-5g/l;
At normal temperatures passivation 10-120 second, pH value is between 3.0-5.0.
Step 3b: clean up this magnesium alloy materials surface with clear water;
Step 4: chemical nickel plating.
The prescription of chemical nickel-plating solution is as follows:
Single nickel salt 15-40g/l;
Trisodium Citrate 10-40g/l;
Sodium hypophosphite 15-40g/l;
PH value is between 7.0-10.0, and temperature is between 40-65 ℃, and the time is 5-60 minute.
Also can use rare nitric acid etching of 0.5-5% in the above-mentioned steps 2.
This inventive method is used non-chromium inactivating technique, and at the magnesium alloy materials chemical nickel plating on surface, this method is to the human and environment close friend, and cost is low, the coating performance excellence.
Claims (9)
1, a kind of magnesium-alloy chemical nickel coating method, it may further comprise the steps:
Step 1: sandblasting on the magnesium alloy materials surface;
Step 2: with acid etch magnesium alloy materials surface;
It is characterized in that:
Step 3: this magnesium alloy materials surface of chromium-free deactivation;
The solution formula of chromium-free deactivation is as follows:
Potassium permanganate 0.1-10g/l;
Primary zinc phosphate 5-30g/l;
Hydrogen fluoride ammonia 10-30g/l;
Zinc sulfate 1-5g/l;
Step 4: chemical nickel plating.
2, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: further comprising the steps of 1b between this step 1 and the step 2: this magnesium alloy materials surface of ultrasonic cleaning.
3, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: further comprising the steps of 2b between this step 2 and the step 3: this magnesium alloy materials surface of ultrasonic cleaning.
4, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: further comprising the steps of 3b between this step 3 and the step 4: clean up this magnesium alloy materials surface with clear water.
5, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: the oxalic acid etching magnesium alloy materials surface of using 0.5-5% in this step 2.
6, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: the nitric acid etching magnesium alloy materials surface of using 0.5-5% in this step 2.
7, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: step 3 chromium-free deactivation is passivation 10-120 second at normal temperatures, and pH value is between 3.0-5.0.
8, magnesium-alloy chemical nickel coating method according to claim 1 is characterized in that: the prescription of chemical nickel-plating solution is as follows in the step 4:
Single nickel salt 15-40g/l;
Trisodium Citrate 10-40g/l;
Sodium hypophosphite 15-40g/l.
9, magnesium-alloy chemical nickel coating method according to claim 8 is characterized in that: the pH value of chemical nickel plating is between 7.0-10.0 in the step 4, and temperature is between 40-65 ℃, and the time is 5-60 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610033851 CN101024877A (en) | 2006-02-24 | 2006-02-24 | Magnesium alloy chemical nickel-plating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610033851 CN101024877A (en) | 2006-02-24 | 2006-02-24 | Magnesium alloy chemical nickel-plating method |
Publications (1)
| Publication Number | Publication Date |
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| CN101024877A true CN101024877A (en) | 2007-08-29 |
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Family Applications (1)
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| CN 200610033851 Pending CN101024877A (en) | 2006-02-24 | 2006-02-24 | Magnesium alloy chemical nickel-plating method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824611A (en) * | 2010-06-12 | 2010-09-08 | 哈尔滨工业大学 | Chemical nickel-plating method for preprocessing magnesium alloy by non-chromium acid pickling activating one-step method |
| CN101660159B (en) * | 2008-08-29 | 2011-09-28 | 海洋王照明科技股份有限公司 | Preservative treatment method for thin carbon steel plate |
| CN102517570A (en) * | 2011-12-28 | 2012-06-27 | 南京工程学院 | Environment-friendly magnesium and magnesium alloy chemical nickel phosphor plating process |
| WO2019006630A1 (en) * | 2017-07-03 | 2019-01-10 | 深圳市盈恒科技有限公司 | Phosphating agent for magnesium alloy, metal part and surface phosphatization process therefor |
-
2006
- 2006-02-24 CN CN 200610033851 patent/CN101024877A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660159B (en) * | 2008-08-29 | 2011-09-28 | 海洋王照明科技股份有限公司 | Preservative treatment method for thin carbon steel plate |
| CN101824611A (en) * | 2010-06-12 | 2010-09-08 | 哈尔滨工业大学 | Chemical nickel-plating method for preprocessing magnesium alloy by non-chromium acid pickling activating one-step method |
| CN102517570A (en) * | 2011-12-28 | 2012-06-27 | 南京工程学院 | Environment-friendly magnesium and magnesium alloy chemical nickel phosphor plating process |
| WO2019006630A1 (en) * | 2017-07-03 | 2019-01-10 | 深圳市盈恒科技有限公司 | Phosphating agent for magnesium alloy, metal part and surface phosphatization process therefor |
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