CN101949011B - Method for treating surface of magnesium alloy - Google Patents
Method for treating surface of magnesium alloy Download PDFInfo
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- CN101949011B CN101949011B CN201010505851A CN201010505851A CN101949011B CN 101949011 B CN101949011 B CN 101949011B CN 201010505851 A CN201010505851 A CN 201010505851A CN 201010505851 A CN201010505851 A CN 201010505851A CN 101949011 B CN101949011 B CN 101949011B
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- magnesium alloy
- dipping
- salpeter solution
- nitric acid
- soaking
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Abstract
The invention relates to a method for treating the surface of a magnesium alloy and a magnesium alloy component prepared thereby. The method comprises the following steps of: soaking the surface of a magnesium alloy substrate in nitric acid solution; applying an ultrasonic wave of which the frequency is 28 kHz during soaking; and selecting specific nitric acid solution concentration, soaking temperature and soaking time to obtain a compact and stable MgO passive film so as to make the surface of the magnesium alloy have good corrosion resistance and luster. The magnesium alloy component treated by the method has good corrosion resistance and considerable metallic luster, and can be widely applied to manufacturing shells of electronic products such as notebook computers, digital cameras, mobile phones and the like.
Description
Technical field
The present invention relates to a kind of surface treatment method of magnesium alloy, improve the surface treatment method that corrosion stability of magnesium alloy guarantees the material surface glossiness simultaneously specifically, and magnesium alloy component obtained by this method.
Background technology
With in the metallic substance, advantage such as magnesium alloy is little because of its proportion, specific tenacity is high, specific rigidity is high, the energy decrement coefficient is big, electromagnetic wave shielding is good more and more receives the concern in fields such as aerospace, electronics, automobile making at utility structure.Particularly in recent years, in order to satisfy the light-weighted needs of electronic product such as notebook computer, digital camera, mobile phone, the application of magnesium alloy in above-mentioned part case is produced obtains fast development, and market outlook are very wide.
And, require it to have suitable metalluster to satisfy the needs of housing visual appearance aspect as case material.But because the chemical property of magnesium is active, magnesium alloy must carry out suitable surface protection processing can be used after improving its solidity to corrosion, and surface treatment method of Mg alloy commonly used all is to make Mg alloy surface lose metalluster usually.
Therefore, carried out the research about utilizing electrolytic polishing method or chemical grinding method to improve the Mg alloy surface solidity to corrosion and keep its metalluster in a large number in recent years.The result shows, if can form stable fine and close oxide film, not only can make magnesium alloy obtain excellent solidity to corrosion, and can improve the glossiness of alloy surface.Fine but these researchs mainly rest on the laboratory study stage, the industrial application of distance also has a certain distance.
Thereby one object of the present invention is to magnesium alloy provides a kind of surface treatment method, advances to some extent on the road that solves foregoing problems at least, a kind of useful selection is provided perhaps at least the industry and/or the public.
Summary of the invention
One object of the present invention is to provide a kind of and improves the surface treatment method of Mg alloy that corrosion stability of magnesium alloy guarantees its surface gloss simultaneously, and magnesium alloy component obtained by this method.
One object of the present invention also is to optimize the various parameters of surface treatment method of Mg alloy, thereby obtains optimum Mg alloy surface treatment effect.
For achieving the above object, the technical solution adopted in the present invention is: at first, use the acetone soln ultrasonic cleaning clean again after the magnesium alloy substrate surface ground with the 2000# emery paper; The magnesium alloy base material of handling well is put into salpeter solution flood, wherein, apply the ultrasonic wave that frequency is 28kHz during dipping, the concentration of salpeter solution is less than 0.6mol/L, and the temperature of dipping is 5 ℃, and dipping time is 30s at least.
Wherein, the concentration of salpeter solution is preferably 0.2-0.5mol/L, more preferably 0.35mol/L; Mg alloy surface less than all being difficult to obtain excellent performance after 0.2mol/L or the salpeter solution processing greater than 0.5mol/L obtains best treatment effect at 0.355mol/L.
Wherein, dipping time is preferably 30-50s, 40s more preferably, and during less than 30s, the protective membrane that dip treating forms is also insufficient, and during greater than 50s, treatment effect remains unchanged substantially.
Wherein, as preferably, the organic acid that can in salpeter solution, add also, making organic acid concentration is 0.01mol/L.
Why the present invention can keep its surperficial metalluster when corrosion stability of magnesium alloy is provided, be that it has formed at Mg alloy surface and has certain thickness MgO passive film.It has been generally acknowledged that, in the chemical grinding process of Mg alloy surface, be difficult to avoid taking place following chemical reaction: Mg+2HNO
3→ Mg (NO
3)
2+ H
2, just because of H
2Generation, caused magnesium alloy to lose surperficial metalluster.And among the present invention, because the unique oxidisability of salpeter solution makes the chemical reaction of Mg alloy surface be: the first step, 2HNO
3+ 6e
-→ 2NO+H
2O+3O
2-Second step, Mg+O
2→ MgO+2e
-The 3rd step, MgO+2HNO
3→ Mg (NO
3)
2+ H
2O.As seen, when generating the MgO passive film, also suppress evolving hydrogen reaction, thereby need to have obtained solidity to corrosion and metalluster in the chemical reaction of the present invention.Furthermore, when concentration of nitric acid (for example being 0.35mol/L), dipping temperature (for example 5 ℃), dipping time (for example 40s) during in optimized condition, because the formation speed of passive film is better than the dissolution rate of passive film, Mg alloy surface will obtain thicker and fine and close MgO passive film, thereby obtain better treatment effect.
Advantage of the present invention is: handle the magnesium alloy component that obtains through the present invention, not only have excellent solidity to corrosion, but also have suitable metalluster, can be widely used in the housing manufacturing of electronic products such as notebook computer, digital camera, mobile phone.
Embodiment
Below, the present invention is described in detail by specific embodiment 1-3.
Embodiment 1.
The employing AZ31 magnesium alloy strip that 50mm is long, 20mm is wide, 0.8mm is thick is as base material.At first, after being ground with the 2000# emery paper, the magnesium alloy substrate surface use the acetone soln ultrasonic cleaning clean again; The salpeter solution of the magnesium alloy base material of handling well being put into different concns floods, and wherein, applies the ultrasonic wave that frequency is 28kHz during dipping, and the temperature of dipping is 5 ℃, and dipping time is 30s.Wherein Germany system BYK-A4374 type glarimeter measurement is adopted in the evaluation of glossiness, and the result who records is with relative glossiness G
cExpression, i.e. G
c=be G (60 °) value on the surface after the nitric acid treatment of C through concentration: directly after the 2000# emery paper grinds and without G (60 °) value on the surface of nitric acid treatment, the result is referring to table 1.Measuring result shows, when concentration of nitric acid is 0.35mol/L, obtains best glossiness.
Table 1.
| Concentration (mol/L) | 0.05 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.55 | 0.6 |
| G c | 1.2 | 1.4 | 1.7 | 2.0 | 2.1 | 2.2 | 2.4 | 2.3 | 2.1 | 2.1 | 2.0 | 1.9 |
Embodiment 2.
The employing AZ31 magnesium alloy strip that 50mm is long, 20mm is wide, 0.8mm is thick is as base material.At first, after being ground with the 2000# emery paper, the magnesium alloy substrate surface use the acetone soln ultrasonic cleaning clean again; The salpeter solution of the magnesium alloy base material of handling well being put into 0.35mol/L floods, and wherein, applies the ultrasonic wave that frequency is 28kHz during dipping, and the temperature of dipping is 5 ℃, and dipping time does not wait from 0-60s.Wherein Germany system BYK-A4374 type glarimeter measurement is adopted in the evaluation of glossiness, and the result who records is with relative glossiness G
tExpression, i.e. G
t=be G (60 °) value on the surface of nitric acid treatment t after the time of 0.35mol/L through concentration: directly after the 2000# emery paper grinds and without G (60 °) value on the surface of nitric acid treatment, the result is referring to table 2.Measuring result shows, when not enough 30s of treatment time, is difficult to obtain stable glossiness, and when treatment time during greater than 50s, glossiness does not obtain significant raising along with the prolongation in treatment time.
Table 2.
| Treatment time (s) | 5 | 10 | 20 | 30 | 40 | 50 | 60 |
| ?G t | 1.3 | 1.9 | 2.2 | 2.4 | 2.5 | 2.4 | 2.5 |
Embodiment 3.
The employing AZ31 magnesium alloy strip that 50mm is long, 20mm is wide, 0.8mm is thick is as base material.At first, after being ground with the 2000# emery paper, the magnesium alloy substrate surface use the acetone soln ultrasonic cleaning clean again; The solution of adipic acid of the magnesium alloy base material of handling well being put into nitric acid+0.01mol/L of the salpeter solution of 0.35mol/L and 0.35mol/L is respectively flooded, wherein, apply the ultrasonic wave that frequency is 28kHz during dipping, the temperature of dipping is 5 ℃, and dipping time is.Wherein Germany system BYK-A4374 type glarimeter measurement is adopted in the evaluation of glossiness, and the result who records is with relative glossiness G
sExpression, i.e. G
s=be worth through the G on the surface after the s solution-treated (60 °): directly grind the back and be worth without the G (60 °) on the surface of nitric acid treatment through the 2000# emery paper, the result is referring to table 3.Measuring result shows, adds organic acid and can improve treatment effect.
Table 3.
| Treatment solution | 0.35mol/L nitric acid | 0.35mol/L the hexanodioic acid of nitric acid+0.01mol/L |
| G t | 2.4 | 2.6 |
In addition, the Mg alloy surface of handling through 0.35mol/L nitric acid treatment liquid has been carried out the aura emmission spectrometric analysis of standard, the result shows that the average O/Mg (weight ratio) in its surface is 0.41, and O/Mg (weight ratio) is 0.67 among the pure in theory MgO, also be in the treated Mg alloy surface, the average Mg that forms MgO accounts for 58% of total amount, shows the passive film MgO that has formed suitable content.
Claims (5)
1. the surface treatment method of a magnesium alloy, it may further comprise the steps: at first, use the acetone soln ultrasonic cleaning clean again after the magnesium alloy substrate surface ground with the 2000# emery paper, the magnesium alloy base material of handling well is put into salpeter solution to be flooded, wherein, apply the ultrasonic wave that frequency is 28kHz during dipping, the concentration of described salpeter solution is 0.35mol/L, the temperature of dipping is 5 ℃, and dipping time is 40s at least.
2. according to the surface treatment method of a kind of magnesium alloy described in the claim 1, it is characterized in that: add organic acid and use as treatment solution to replace described salpeter solution in described salpeter solution, wherein organic acid concentration is 0.01mol/L.
3. magnesium alloy component that the surface treatment method that utilizes claim 1 or 2 described magnesium alloy prepares.
4. a kind of magnesium alloy component according to claim 3, wherein magnesium alloy is AZ31.
5. according to claim 3 or 4 described a kind of magnesium alloy components, wherein these parts are used to the housing manufacturing of notebook computer, digital camera, mobile phone.
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|---|---|---|---|
| CN201010505851A CN101949011B (en) | 2010-10-14 | 2010-10-14 | Method for treating surface of magnesium alloy |
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|---|---|---|---|
| CN201010505851A CN101949011B (en) | 2010-10-14 | 2010-10-14 | Method for treating surface of magnesium alloy |
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| CN101949011B true CN101949011B (en) | 2011-11-30 |
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| CN103205741B (en) * | 2012-01-13 | 2016-01-20 | 苏州汉扬精密电子有限公司 | Magnesium alloy passivating solution and surface treatment method of Mg alloy |
| TWI735355B (en) * | 2020-10-19 | 2021-08-01 | 廷鑫興業股份有限公司 | Magnesium implant biomedical material having surface passivation layer and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294205A (en) * | 1999-10-31 | 2001-05-09 | 富金精密工业(深圳)有限公司 | Non-chromium treating process for chemically modifying surficial film of Mg alloy |
| CN1632169A (en) * | 2005-01-17 | 2005-06-29 | 大连理工大学 | Process for magnesium alloy surface treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4123359B2 (en) * | 2002-09-02 | 2008-07-23 | 株式会社カサタニ | Surface treatment agent for magnesium and magnesium alloy, surface treatment method using the treatment agent, product obtained by the method, and magnesium and magnesium alloy |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294205A (en) * | 1999-10-31 | 2001-05-09 | 富金精密工业(深圳)有限公司 | Non-chromium treating process for chemically modifying surficial film of Mg alloy |
| CN1632169A (en) * | 2005-01-17 | 2005-06-29 | 大连理工大学 | Process for magnesium alloy surface treatment |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2004-149911A 2004.05.27 |
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