CN101054712A - Method of preparing transparent film on magnesium alloy surface - Google Patents
Method of preparing transparent film on magnesium alloy surface Download PDFInfo
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- CN101054712A CN101054712A CN 200710063631 CN200710063631A CN101054712A CN 101054712 A CN101054712 A CN 101054712A CN 200710063631 CN200710063631 CN 200710063631 CN 200710063631 A CN200710063631 A CN 200710063631A CN 101054712 A CN101054712 A CN 101054712A
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Abstract
The present invention relates to a process for preparing transparent films at electron alloys surfaces. According to the method, a direct-current power supply is adopted, an electric voltage of 150-200V is applied to the electron alloys immersed in alkaline electrolytic solution for 5-15 minutes to generate a transparent or semitransparent oxidation film of a thickness of 5-20 mu m at electron alloys surfaces. The electrolytic solution used in the process is prepared by using deionized water, with a proportioning of disodium hydrogen phosphate of 8-15 g, sodium aluminate of 1-3 g, 25% ammonia spirit of 2-8 ml/L and triethylene tetraamine of 1-5 ml/L. Said process is characterized by its simplicity of operation and safe process; the electrolytic solution used doesn't pollute the environment; the oxidation film prepared is colourless or transparent and is capable of indicating the matrix metal color of electron alloys, has excellent decorating properties, and can improve effectively corrosion resistance of the electron alloys.
Description
Technical field
The present invention relates to a kind ofly prepare the method for transparent film, belong to the electrochemical surface treatment process field of magnesium alloy at Mg alloy surface.
Background technology
Magnesium alloy is because the specific tenacity height, and is antimagnetic, damping performance good, the fields such as aviation, automobile making, information industry that are applied to more and more widely.But because magnesium is as lively as a cricket metal, its standard potential is negative, and (2.36V), solidity to corrosion is poor, is difficult to direct use.For improving the solidity to corrosion of magnesium alloy, must carry out suitable surfacecti proteon to magnesium alloy and handle.
Patent CN1369577A discloses a kind of " magnesium alloy surface treatment process ", and this technology belongs to magnesium alloy differential arc oxidation treatment process category, and prepared membrane can improve the corrosion resistance nature of ceramic membrane effectively.But Mg alloy surface exists micro-arc spark in treating processes, and the rete of generation is more coarse, and the rete that generates covered the metallic color of magnesium alloy itself, has influenced the texture of magnesium-alloy material.
Patent 200510032436.X discloses a kind of " magnesium alloy is at the anodic oxidation electrolyte and the anode oxidation method that press down under the arc state of oxidation ", this anode oxidation process method can be prepared canescence or silver-gray oxide film at Mg alloy surface, improves the corrosion resistance nature of magnesium alloy.Micro-arc spark does not appear in this technology Mg alloy surface in treating processes, and rete is dense, but the color of rete itself has also been covered the metallic color of magnesium alloy itself, has influenced the texture of magnesium-alloy material.
Summary of the invention
The technical problem to be solved in the present invention is to prepare water white rete at Mg alloy surface, make magnesium alloy workpiece after treatment still can reflect metallic luster own, improve the texture of magnesium-alloy material, can improve simultaneously the corrosion resistance nature of magnesium alloy again, a kind of method for preparing transparent film at Mg alloy surface is provided.
The technical solution used in the present invention is as follows:
A kind ofly prepare the method for transparent film at Mg alloy surface, the employed electrolytic solution of this method is prepared by deionized water, and its proportioning is 8～15g/l Sodium phosphate dibasic, 1～3g/l sodium aluminate, 25% ammoniacal liquor, 2～8ml/l, 1～5ml/l triethylene tetramine;
To put into the stainless steel electrolytic groove through the magnesium alloy workpiece that oil removing is cleaned, magnesium alloy workpiece connects the positive pole of power supply, and the cell body of stainless steel electrolytic groove connects power cathode, and magnesium alloy workpiece is applied voltage, voltage range 150～200V, 5～15 minutes treatment times.
The temperature of described electrolytic solution is controlled at 15～35 ℃.
After treatment magnesium alloy is cleaned and drying treatment.
The invention has the beneficial effects as follows:
Utilize the present invention, can prepare thickness at Mg alloy surface in 5～15 minutes is the thick oxide films of 5～20 μ m, this oxide film water white transparency, evenly fine and close, can significantly improve the erosion resistance of magnesium alloy workpiece, and can reflect the metallic luster of magnesium alloy itself, have the excellent decoration performance.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment one:
Step 1 adopts acetone to clean the greasy dirt of removing the AZ91D Mg alloy surface, polishes, and then cleans with acetone, with the tap water flushing, uses deionized water rinsing more earlier.
Step 2 is with load weighted 160g Sodium phosphate dibasic, join in the stainless steel electrolytic groove that fills 10 liters of deionized waters, stirring is dissolved Sodium phosphate dibasic fully, sodium aluminate with load weighted 60g adds in the electrolyzer then, stirring is dissolved sodium aluminate fully, then load weighted 100 milliliters ammoniacal liquor (25%) is added in the electrolyzer, stir, in electrolytic solution, add 40 milliliters triethylene tetramine then, stir, continue then in electrolyzer, to add deionized water, make that the cumulative volume of electrolytic solution reaches 20 liters in the electrolyzer, and electrolytic solution is stirred.This moment, the proportioning of electrolytic solution was the 8g/l Sodium phosphate dibasic, 3g/l sodium aluminate, 8ml/l ammoniacal liquor (25%), 2ml/l triethylene tetramine.
Step 3 is installed in the AZ91D magnesium alloy on the conductive fixture, be immersed in the stainless steel electrolytic groove that fills electrolytic solution, anchor clamps connect the positive pole of direct supply, cell body connects dc power cathode, by direct supply magnesium alloy workpiece is applied voltages to crest voltage 160V, electrolyte temperature is controlled at 25 ℃, and the treatment time is 5 minutes.
The AZ91D used for magnesium alloy tap water of step 4 pair after oxide treatment cleans drying.
Prepared oxide film water white transparency, the surface smoothness height can reflect the metallic color of magnesium alloy itself to have metal-like.The ISOCOPE MPOD type eddy current thickness meter that adopts German Fisher company is 5.8 μ m according to the thickness that standard GB 4957-85 measures the oxide film after 5 minutes oxide treatment, adopt the anti-neutral salt spray corrosive nature of HK-2 type salt air corrosion experimental box according to standard GB/T10125-1997 measurement oxide film, slight corrosion pit just appearred in continuous spray testing rear oxidation film surface through 72 hours.
Embodiment two:
Step 1 employing wipes of alcohol washes down the greasy dirt except that the AZ31 Mg alloy surface, polishes, and then cleans with alcohol, with the tap water flushing, uses deionized water rinsing more earlier.。
Step 2 is with load weighted 600g Sodium phosphate dibasic, join in the stainless steel electrolytic groove that fills 20 liters of deionized waters, stirring is dissolved Sodium phosphate dibasic fully, then load weighted 50g sodium aluminate is added in the electrolyzer, stirring is dissolved sodium aluminate fully, then load weighted 300 milliliters ammoniacal liquor (25%) is added in the electrolyzer, stir, in electrolytic solution, add 250 milliliters triethylene tetramine then, stir, continue then in electrolyzer, to add deionized water, make that the cumulative volume of electrolytic solution reaches 50 liters in the electrolyzer, and electrolytic solution is stirred.This moment, the concentration of electrolytic solution was the 12g/l Sodium phosphate dibasic, 1g/l sodium aluminate, 6ml/l ammoniacal liquor (25%), 5ml/l triethylene tetramine.
Step 3 is installed in the AZ31 magnesium alloy on the conductive fixture, be immersed in the stainless steel electrolytic groove that fills electrolytic solution, anchor clamps connect the positive pole of direct supply, cell body connects dc power cathode, by power supply magnesium alloy workpiece is applied voltages to crest voltage 150V, electrolyte temperature is controlled at 15 ℃, and the treatment time is 10 minutes.
The AZ31 used for magnesium alloy tap water of step 4 pair after oxide treatment cleans drying.
Prepared oxide film water white transparency, the surface smoothness height can reflect the metallic color of magnesium alloy itself.The ISOCOPE MPOD type eddy current thickness meter that adopts German Fisher company is 12.4 μ m according to the thickness that standard GB 4957-85 measures the ceramic membrane after 10 minutes oxide treatment, adopt the anti-neutral salt spray corrosive nature of HK-2 type salt air corrosion experimental box according to standard GB/T10125-1997 measurement ceramic membrane, ceramic membrane surface does not have the obvious corrosion spot after continuous spray testing in 72 hours.
Embodiment three:
Step 1 adopts acetone to clean the greasy dirt of removing the AZ91D Mg alloy surface, polishes, and then cleans with acetone, with the tap water flushing, uses deionized water rinsing more earlier.。
Step 2 is with load weighted 750g Sodium phosphate dibasic, join in the stainless steel electrolytic groove that fills 30 liters of deionized waters, stirring is dissolved Sodium phosphate dibasic fully, then load weighted 100g sodium aluminate is added in the electrolyzer, stirring is dissolved sodium aluminate fully, then load weighted 100 milliliters ammoniacal liquor (25%) is added in the electrolyzer, stir, in electrolytic solution, add 150 milliliters triethylene tetramine then, stir, continue then in electrolyzer, to add deionized water, make that the cumulative volume of electrolytic solution reaches 50 liters in the electrolyzer, and electrolytic solution is stirred.This moment, the concentration of electrolytic solution was the 15g/l Sodium phosphate dibasic, 2g/l sodium aluminate, 2ml/l ammoniacal liquor (25%), 3ml/l triethylene tetramine.
Step 3 is installed in the AZ91 magnesium alloy on the conductive fixture, be immersed in the stainless steel electrolytic groove that fills electrolytic solution, anchor clamps connect the positive pole of direct supply, cell body connects dc power cathode, by power supply magnesium alloy workpiece is applied voltages to crest voltage 200V, electrolyte temperature is controlled at 35 ℃, and the treatment time is 15 minutes.
The AZ91 used for magnesium alloy tap water of step 4 pair after oxide treatment cleans drying.
Prepared oxide film water white transparency, the surface smoothness height can reflect the metallic color of magnesium alloy itself.The ISOCOPE MPOD type eddy current thickness meter that adopts German Fisher company is 17.7 μ m according to the thickness that standard GB 4957-85 measures the oxide film after 15 minutes oxide treatment, adopt the anti-neutral salt spray corrosive nature of HK-2 type salt air corrosion experimental box, the no obvious corrosion spot in continuous spray testing rear oxidation film surface through 72 hours according to standard GB/T10125-1997 measurement oxide film.
Sodium phosphate dibasic used in the present invention, sodium aluminate and ammoniacal liquor are analytical pure or chemical pure.
The present invention uses the method for electrochemical oxidation to prepare oxide film at Mg alloy surface, Mg alloy surface does not have spark to produce in treating processes, by the interaction between electrolyte component, make prepared oxide film water white transparency, can effectively reflect the metallic color of magnesium alloy itself.Its thickness is at 5～15 μ m, and the corrosive of anti-neutral salt spray test period of oxide film surpasses 72 hours, so oxide film has higher corrosion resistance nature and decorate properties preferably.In addition, the electrolytic solution that this treatment process adopted is weakly alkaline electrolytic solution, and environmental pollution is few, has a stronger practical value industrial.
Claims (2)
1. method for preparing transparent film at Mg alloy surface, it is characterized in that: the employed electrolytic solution of this method is prepared by deionized water, and its proportioning is 8～15g/l Sodium phosphate dibasic, 1～3g/l sodium aluminate, 25% ammoniacal liquor, 2～8ml/l, 1～5ml/l triethylene tetramine;
To put into the stainless steel electrolytic groove through the magnesium alloy workpiece that oil removing is cleaned, magnesium alloy workpiece connects the positive pole of power supply, and the cell body of stainless steel electrolytic groove connects the negative pole of power supply, and magnesium alloy workpiece is applied voltage, voltage range 150～200V, 5～15 minutes treatment times.
2. according to claim 1ly prepare the method for transparent film at Mg alloy surface, it is characterized in that: the temperature of described electrolytic solution is controlled at 15～35 ℃.
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| CNB2007100636318A CN100513651C (en) | 2007-02-07 | 2007-02-07 | Method of preparing transparent film on magnesium alloy surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110863195A (en) * | 2019-11-28 | 2020-03-06 | 重庆大学 | Magnesium alloy surface treatment method used in high-concentration chloride ion environment |
| CN114686952A (en) * | 2022-05-07 | 2022-07-01 | 山西银光华盛镁业股份有限公司 | Preparation method of transparent oxide film on surface of plastic deformation magnesium alloy workpiece |
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2007
- 2007-02-07 CN CNB2007100636318A patent/CN100513651C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110863195A (en) * | 2019-11-28 | 2020-03-06 | 重庆大学 | Magnesium alloy surface treatment method used in high-concentration chloride ion environment |
| CN110863195B (en) * | 2019-11-28 | 2021-10-15 | 重庆大学 | Magnesium alloy surface treatment method used in high-concentration chloride ion environment |
| CN114686952A (en) * | 2022-05-07 | 2022-07-01 | 山西银光华盛镁业股份有限公司 | Preparation method of transparent oxide film on surface of plastic deformation magnesium alloy workpiece |
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| CN100513651C (en) | 2009-07-15 |
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