CN103911645A - Magnesium alloy anode oxidation method - Google Patents
Magnesium alloy anode oxidation method Download PDFInfo
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- CN103911645A CN103911645A CN201410150157.2A CN201410150157A CN103911645A CN 103911645 A CN103911645 A CN 103911645A CN 201410150157 A CN201410150157 A CN 201410150157A CN 103911645 A CN103911645 A CN 103911645A
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Abstract
The invention relates to a magnesium alloy anode oxidation method sequentially comprising degreasing, pickling, alkali corrosion, anodic oxidation and drying steps, and a pulse power supply used in the anodic oxidation step outputs AC square wave pulses. An anodic oxidation film generated in the anodic oxidation process is not burnt and the surface of the oxidation film is smooth.
Description
Technical field
The present invention relates to anodization, be specifically related to a kind of anodic oxidation method for magnesium alloy.
Background technology
Magnesium alloy is applied very general in aerospace, Transport Machinery and 3C industry, because its chemical stability is low, solidity to corrosion is poor, very easily corrosion under atmospheric environment, therefore must carry out suitable surface treatment to magnesium alloy product and improve erosion resistance.
Conventional surface treatment method of Mg alloy is anodic oxidation at present, can significantly improve the erosion resistance of Mg alloy surface, and magnesium alloy after treatment also has certain wear resistance, the vesicular structure on the anode oxide film surface forming after processing can also provide the bonding force good with coating layer.
But applicant finds in the time using anodic oxidation method for magnesium alloy of the prior art: if use direct current in anodic oxidation step, between the reaction period, direct current continues uninterrupted current through oxide film, produce a large amount of joule heatings, and along with oxide film thickens, membrane resistance increases, thermal value is larger, if heat can not get distributing in time, can cause anode oxide film scaling loss; Although if use direct current square-wave pulse can solve the large problem of direct current oxidation thermal value, but because each position reaction severe degree of oxide film surface differs, make oxide film surface irregularity injustice, generate the white particle of a large amount of projections, and porosity is large, solidity to corrosion is undesirable.
Summary of the invention
For solving above technical problem, the invention provides a kind of anodic oxidation method for magnesium alloy, make the anode oxide film not burning and the oxide film surfacing that in anode oxidation process, generate.
The present invention is achieved through the following technical solutions:
A kind of anodic oxidation method for magnesium alloy, comprise successively degreasing, pickling, alkaline etching, anodic oxidation, drying step, the pulse power output AC square-wave pulse using in described anodic oxidation step, the pulse-repetition using is 50～500Hz, direct impulse dutycycle is 5%～40%, negative-going pulse dutycycle is 5%～40%, and direct impulse current density is 0.5～5A/dm
2, negative-going pulse current density 0.5～5A/dm
2.
In technique scheme, the electrolytic solution that in described anodic oxidation step, magnesium alloy immerses comprises NaOH10～100g/L, Na
2siO
310～100g/L, trisodium citrate 2～30g/L.
In technique scheme, described anodic oxidation step is to carry out under 5～40 DEG C of conditions in temperature, and the time is 5～30min.
In technique scheme, in described defatting step, comprise Na for the degreasing fluid that cleans magnesium alloy
3pO
410～30g/L, Na
2cO
310～50g/L, OP-102～10ml/L carry out under 40～60 DEG C of conditions of temperature, and the time is 5～15min.
In technique scheme, the dilute nitric acid solution that is 3～10% by massfraction used for magnesium alloy in described acid pickling step cleans, and at room temperature carries out time 10～30s.
In technique scheme, in described alkaline etching step, magnesium alloy is immersed to the NaOH solution of 50～150g/L, be to react 3～15min under 70～100 DEG C of conditions in temperature.
In technique scheme, described drying step is dry under 80～120 DEG C of conditions of temperature, and the time is 10～30min.
The present invention has used ac square wave pulse, and in the time that output waveform is direct impulse square wave, the magnesium alloy sample that immerses electrolytic solution is anode, specimen surface generation oxidizing reaction, and the electrolyzer that electrolytic solution is housed is negative electrode, cell surface generation reduction reaction; In the time that output waveform is negative-going pulse square wave, electrolyzer is anode, and oxidizing reaction occurs, and magnesium alloy sample is negative electrode, and reduction reaction occurs.Therefore, when output waveform is during in negative-going pulse square wave, due to specimen surface generation cathodic reduction reaction, magnesium ion in electrolytic solution is at specimen surface electron gain, form with the oxide compound of magnesium deposits, particularly at the hole on oxide film surface, the microscopic defect places such as crackle, because impedance is relatively low, more easily deposit at these position electron gains, defect is filled, make aperture, crackle dwindles, in the time that next positive pulse square wave arrives, spark discharge while being deposited on material in defect by anodic oxidation, with together molten sintering of periphery oxide film, become entirety.In addition when output waveform is during in negative pulse square wave, under electric field transporting action, specimen surface enrichment H
+, OH simultaneously
-to cell wall migration, reduce magnesium alloy sample surface basicity, alleviate the chemical corrosion of electrolytic solution to oxide film, make oxide film more even.And user's wave impulse of the present invention, compared with DC electrolyzing, electric current is not to continue the uninterrupted oxide film that passes through, therefore the joule heating on oxide film surface is also unlikely to oxide film scaling loss.
Brief description of the drawings
Fig. 1 is bi-directional square wave pulse current waveform figure, wherein T (unit: s) be a recurrence interval, t1 (unit: s) be direct impulse action time, t2 (unit: s) be negative-going pulse action time;
Fig. 2 is the polarization curve of Anodic Film On Magnesium Alloy under different negative pulse current densities and the polarization curve with untreated samples (substrate);
Fig. 3 a is the surface topography of anode oxide film while not applying negative pulse electric current;
Fig. 3 b is the surface topography partial enlarged drawing of anode oxide film while not applying negative pulse electric current;
Fig. 3 c is the surface topography of the anode oxide film that forms of the embodiment of the present invention one;
Fig. 3 d is the surface topography partial enlarged drawing of the anode oxide film that forms of the embodiment of the present invention one;
Embodiment
Embodiment mono-
A kind of anodic oxidation method for magnesium alloy, comprises the steps:
Degreasing: use Na
3pO
410～30g/L, Na
2cO
310～50g/L, OP-102～10ml/L cleans magnesium alloy sample, removes the greasy dirt of Mg alloy surface, 40～60 DEG C of temperature, time 5～15min.
Pickling: use 3～10% dilute nitric acid solution removal Mg alloy surface oxide compound and other dirt, temperature is room temperature, time 10～30s.
Alkaline etching: the residue that uses the NaOH solution removal acid pickling step of 50～150g/L to produce, temperature is 70～100 DEG C, time 3～15min.
Anodic oxidation: the electrolyte prescription of use is NaOH10～100g/L, Na
2siO
310～100g/L and trisodium citrate 2～30g/L.Frequency of utilization is 300Hz, direct impulse dutycycle 10%, negative-going pulse dutycycle 10%, direct impulse current density 1.5A/dm
2, negative-going pulse current density 3A/dm
2, 20 DEG C of temperature, time 10min, obtaining thickness is 5 μ m, milky anode oxide film.
Dry: 80～120 DEG C of temperature, time 10～30min.
The anode oxide film that the present embodiment one forms all presents vesicular surface topography as shown in Figure 3 c, visible when applying after negative pulse electric current, although oxide film surface is still distributed with a large amount of circular holes, but (see that Fig. 3 d) can find out that wherein the aperture of big hole obviously dwindles by the figure that amplifies 4000 times, although and still old crackle of oxide film surface, but the length or the width that are crackle all obviously dwindle, and the hole of strip is also vanished from sight.While not applying negative pulse electric current, the surface topography of anode oxide film as shown in Figure 3 a, film surface a large amount of circular holes not of uniform size that distributing equably, (see Fig. 3 b) by the figure that amplifies 4000 times is known, wherein the diameter of big hole is about 5 μ m, the slit that has simultaneously also occurred obvious crackle and a large amount of strips, the existence of these surface imperfection can damage for the erosion resistance of oxide film;
Embodiment bis-
A kind of anodic oxidation method for magnesium alloy, comprises the steps:
Degreasing: use Na
3pO
410～30g/L, Na
2cO
310～50g/L, OP-102～10ml/L cleans magnesium alloy sample, removes the greasy dirt of Mg alloy surface, 40～60 DEG C of temperature, time 5～15min.
Pickling: use 3～10% dilute nitric acid solution removal Mg alloy surface oxide compound and other dirt, temperature is room temperature, time 10～30s.
Alkaline etching: the residue that uses the NaOH solution removal acid pickling step of 50～150g/L to produce, temperature is 70～100 DEG C, time 3～15min.
Anodic oxidation: the electrolyte prescription of use is NaOH10～100g/L, Na
2siO
310～100g/L and trisodium citrate 2～30g/L.Frequency of utilization is 400Hz, direct impulse dutycycle 5%, negative-going pulse dutycycle 10%, direct impulse current density 2A/dm
2, negative-going pulse current density 2A/dm
2, 20 DEG C of temperature, time 10min, obtaining thickness is 8 μ m, milky anode oxide film.
Dry: 80～120 DEG C of temperature, time 10～30min.
Embodiment tri-
A kind of anodic oxidation method for magnesium alloy, comprises the steps:
Degreasing: use Na
3pO
410～30g/L, Na
2cO
310～50g/L, OP-102～10ml/L cleans magnesium alloy sample, removes the greasy dirt of Mg alloy surface, 40～60 DEG C of temperature, time 5～15min.
Pickling: use 3～10% dilute nitric acid solution removal Mg alloy surface oxide compound and other dirt, temperature is room temperature, time 10～30s.
Alkaline etching: the residue that uses the NaOH solution removal acid pickling step of 50～150g/L to produce, temperature is 70～100 DEG C, time 3～15min.
Anodic oxidation: the electrolyte prescription of use is NaOH10～100g/L, Na
2siO
310～100g/L and trisodium citrate 2～30g/L.Frequency of utilization is 400Hz, direct impulse dutycycle 10%, negative-going pulse dutycycle 5%, direct impulse current density 1A/dm
2, negative-going pulse current density 1A/dm
2, 20 DEG C of temperature, time 15min, obtaining thickness is 5 μ m, milky anode oxide film.
Dry: 80～120 DEG C of temperature, time 10～30min.
Embodiment tetra-
Measure through corrosion potential, corrosion resistance and the polarization resistance of method of the present invention magnesium alloy sample after treatment and with contrast without the sample of the inventive method processing, the polarization curve of measurement is shown in Fig. 2, the concrete data that draw according to Fig. 2 are in table 1.
The electrochemical parameter that table 1. polarization curve is corresponding
As shown in Table 1, through anode oxidation method of the present invention, the corrosion electric current density of sample reduces, and polarization resistance increases, and illustrates that erosion resistance strengthens.When negative pulse current density is 0 and 1A/dm
2time corrosion electric current density approach, compared with untreated samples reduce by 1 order of magnitude (being exactly substrate); When negative pulse current density is 2 and 3A/dm
2time, corrosion electric current density further reduces, and reduces by 2 and 3 orders of magnitude respectively compared with untreated samples, and polarization resistance enlarges markedly simultaneously, and the increase with negative pulse current density is described, and the erosion resistance of sample slowly improved before this, significantly improved subsequently.
It should be noted last that, above embodiment is only unrestricted in order to the technical scheme of explanation invention, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. an anodic oxidation method for magnesium alloy, it is characterized in that: comprise successively degreasing, pickling, alkaline etching, anodic oxidation, drying step, the pulse power output AC square-wave pulse using in described anodic oxidation step, the pulse-repetition using is 50～500Hz, direct impulse dutycycle is 5%～40%, negative-going pulse dutycycle is 5%～40%, and direct impulse current density is 0.5～5A/dm
2, negative-going pulse current density 0.5～5A/dm
2.
2. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: the electrolytic solution that in described anodic oxidation step, magnesium alloy immerses comprises NaOH10～100g/L, Na
2siO
310～100g/L, trisodium citrate 2～30g/L.
3. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: described anodic oxidation step is to carry out under 5～40 DEG C of conditions in temperature, and the time is 5～30min.
4. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: in described defatting step, comprise Na for the degreasing fluid that cleans magnesium alloy
3pO
410～30g/L, Na
2cO
310～50g/L, OP-102～10ml/L carry out under 40～60 DEG C of conditions of temperature, and the time is 5～15min.
5. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: the dilute nitric acid solution that is 3～10% by massfraction used for magnesium alloy in described acid pickling step cleans, and at room temperature carries out time 10～30s.
6. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: in described alkaline etching step, magnesium alloy being immersed to the NaOH solution of 50～150g/L, is to react 3～15min under 70～100 DEG C of conditions in temperature.
7. anodic oxidation method for magnesium alloy as claimed in claim 1, is characterized in that: described drying step is dry under 80～120 DEG C of conditions of temperature, and the time is 10～30min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313099A (en) * | 2016-04-26 | 2017-11-03 | 昆山汉鼎精密金属有限公司 | Magnesium alloy oxidation chromophoric method and products thereof |
| CN107641826A (en) * | 2016-07-21 | 2018-01-30 | 富泰华精密电子（济源）有限公司 | Aluminium alloy anode oxide method |
| CN108570646A (en) * | 2018-03-29 | 2018-09-25 | 瑞宏精密电子（太仓）有限公司 | A kind of surface anti-fingerprint treatment process of notebook computer casing |
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| JP2003301297A (en) * | 2002-04-11 | 2003-10-24 | Mitsui Mining & Smelting Co Ltd | Method for forming anode oxidation film |
| CN1653212A (en) * | 2002-03-25 | 2005-08-10 | 堀金属表面处理工业股份有限公司 | Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof |
| CN103526251A (en) * | 2013-10-15 | 2014-01-22 | 北京星航机电装备有限公司 | Method for preparing micro-arc oxidation film with photocatalysis function |
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| CN1653212A (en) * | 2002-03-25 | 2005-08-10 | 堀金属表面处理工业股份有限公司 | Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof |
| JP2003301297A (en) * | 2002-04-11 | 2003-10-24 | Mitsui Mining & Smelting Co Ltd | Method for forming anode oxidation film |
| CN103526251A (en) * | 2013-10-15 | 2014-01-22 | 北京星航机电装备有限公司 | Method for preparing micro-arc oxidation film with photocatalysis function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313099A (en) * | 2016-04-26 | 2017-11-03 | 昆山汉鼎精密金属有限公司 | Magnesium alloy oxidation chromophoric method and products thereof |
| CN107641826A (en) * | 2016-07-21 | 2018-01-30 | 富泰华精密电子（济源）有限公司 | Aluminium alloy anode oxide method |
| CN107641826B (en) * | 2016-07-21 | 2020-06-26 | 富泰华精密电子（济源）有限公司 | Aluminum alloy anodic oxidation method |
| CN108570646A (en) * | 2018-03-29 | 2018-09-25 | 瑞宏精密电子（太仓）有限公司 | A kind of surface anti-fingerprint treatment process of notebook computer casing |
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| CN103911645B (en) | 2017-04-19 |
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Effective date of registration: 20180211 Address after: 226600 C area 8, city north industrial concentrated area, Dagong Town, Haian County, Nantong, Jiangsu Patentee after: JIANGSU ZHONGKE YAMEI NEW MATERIAL CO., LTD. Address before: No. 5, Jiaxing science and Technology City, Asia Pacific Road, Nanhu District, Jiaxing, Zhejiang Patentee before: Jiaxing Light Alloy Technology Engineering Center, Chinese Academy of Sciences |
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Address after: 226600 No. 8, C District, Chengbei industrial concentration area, Haian County, Nantong, Jiangsu. Patentee after: Jiangsu Zhongke Yamei New Materials Co.,Ltd. Address before: 226600 No.8, Zone C, Chengbei industrial concentration area, Dagong Town, Hai'an County, Nantong City, Jiangsu Province Patentee before: JIANGSU ZHONGKE YAMEI NEW MATERIAL Co.,Ltd. |