CN103668226A - Magnesium alloy high-corrosion-resistance surface treatment method and product thereof - Google Patents
Magnesium alloy high-corrosion-resistance surface treatment method and product thereof Download PDFInfo
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- CN103668226A CN103668226A CN201210337216.8A CN201210337216A CN103668226A CN 103668226 A CN103668226 A CN 103668226A CN 201210337216 A CN201210337216 A CN 201210337216A CN 103668226 A CN103668226 A CN 103668226A
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Abstract
The invention provides a magnesium alloy high-corrosion-resistance surface treatment method and a product thereof. The method comprises the following steps: (1) pretreating a die-casting-molded magnesium alloy product; (2) degreasing the pretreated magnesium alloy product in an alkaline degreaser; (3) activating the degreased magnesium alloy product with a pickling activator; (4) immersing the activated magnesium alloy product in a strongly alkaline solution to perform neutralizing treatment; (5) carrying out wire drawing treatment on the magnesium alloy product subjected to neutralizing treatment; (6) carrying out passivating treatment on the magnesium alloy product subjected to wire drawing treatment; and (7) carrying out cathode electrophoresis treatment on the surface of the magnesium alloy product subjected to passivating treatment. The product is obtained after carrying out the treatment method. Compared with the prior art, the treatment method provided by the invention has the advantages of short preparation procedure and high efficiency; and the treated product has the advantages of beautiful appearance and high adhesive force, and can maintain favorable surface hairline grains and have the property of powder application.
Description
[technical field]
The present invention relates to a kind of surface treatment method of Mg alloy, be specifically related to a kind of magnesium alloy high anti-corrosion surface treatment method and products thereof.
[background technology]
Because magnesium alloy materials is a kind of lightweight structural material, quality is aluminium 2/3, and 1/4 of iron and steel, compares with engineering materialss such as steel, aluminium, plastics, and it is good that magnesium alloy has strength and stiffness, and capability of electromagnetic shielding is good, nonmagnetic; Shock absorption is good; Nontoxic, recyclable; Fabulous machinability, high Die Casting rate, dimensional contraction is little, and has good low-temperature performance and thermal conductivity high is widely used.
Due to the own characteristic of the low corrosion potential of magnesium alloy, the magnesium alloy that is applied in the 3C fields such as electronics, communication is all that first to carry out phosphorus be after epithelium is processed substantially, then carries out high-temperature powder application.Wherein, application processing procedure need to carry out 2～3 layers of priming paint, mend soil and finish paint processing, and this kind of processing procedure grown and contaminate environment, and through the Mg alloy surface of this kind of processing procedure, generally has the paint film of 40～100 μ m, there is no metal-like completely, also there will be the problem that sticking power is inadequate simultaneously.
In view of this, be necessary to provide in fact a kind for the treatment of process of Mg alloy surface, make the product after processing both can reach the requirement of metal-like, solve again the problem of complex process simultaneously.
[summary of the invention]
In order to achieve the above object, the invention provides a kind of magnesium alloy high anti-corrosion surface treatment method, it comprises following treatment step:
(1) magnesium-alloy material of die cast is carried out to pre-treatment;
(2) in alkaline defatting agent to pretreated magnesium-alloy material degreasing;
(3) magnesium-alloy material after adopting acid-wash activation agent to degreasing activates;
(4) magnesium-alloy material after activation is soaked to carry out neutralizing treatment in strong base solution;
(5) magnesium-alloy material after neutralizing treatment is carried out to wire drawing processing;
(6) magnesium-alloy material after wire drawing processing is carried out to Passivation Treatment;
(7) ability cathode electrophoresis processing is carried out on the magnesium-alloy material surface after Passivation Treatment.
Preferably, the pre-treatment of described step (1) is removed burr for magnesium-alloy material surface being carried out to mechanical mill, then product surface is done Kongfu, and obtains qualified magnesium-alloy material.
Preferably, in described step (2): the temperature of grease-removing agent is 50 ℃; Degreasing time is 3～5min.
Preferably, described step (2) neutral and alkali grease-removing agent comprises that concentration is the sodium phosphate of 10～15g/L and the Sodium dodecylbenzene sulfonate that concentration is 1g/L.
Preferably, in described step (3): the temperature of acid-wash activation agent is 40 ℃; Soak time is 60s.
Preferably, acid-wash activation agent comprises that concentration is the nitric acid that the citric acid of 10～15g/L and lactic acid that concentration is 15～20g/L and concentration are 10～15g/L in described step (3).
Preferably, in described step (4): strong base solution is that massfraction is 5% NaOH solution; Soak time is 60 seconds.
Preferably, in described step (6): the temperature of Passivation Treatment is 50 ℃; Passivation time is 30s.
Preferably, the mixed solution of Passivation Treatment comprises that concentration is the sustained release dosage that the oxidizing acid of 1～3g/L and complexing agent that concentration is 3～6g/L and concentration are 1～2g/L in described step (6).
Preferably, in described step (6): oxidizing acid is HNO
3; Complexing agent is citric acid; Sustained release dosage is benzotriazole.
Preferably, afterwards, step (7) before, comprises a step (8) to described step (6): the magnesium-alloy material after above-mentioned steps (6) Passivation Treatment is toasted.
Preferably, in described step (7): the control voltage of electrophoretic process is 50～70V, conductance is 600～900 μ m/cm, and the treatment time is 30～90s; Electrophoretic paint is LF-3 varnish and TE139 mill base; The curing amount of electrophoresis groove liquid is 8～12%.
Preferably, described step (7) afterwards, comprises a step (9): the magnesium-alloy material after electrophoretic process is toasted and slaking.
Preferably, in described step (9): storing temperature is 80～100 ℃, baking time is 10min; Curing temperature is 160 ℃, and the curing time is 30～40min.
Preferably, described step (3) and step (4) are carried out respectively 2 times.
The present invention also provides a kind of magnesium alloy high anti-corrosion surface treated product, and it is the product producing after above-mentioned magnesium alloy high anti-corrosion surface treatment method is processed.
Compared to prior art, magnesium alloy high anti-corrosion surface treatment method of the present invention and products thereof, by diecast magnesium alloy being carried out to the processing such as wire drawing, passivation, electrophoretic painting, make that its processing procedure is short, efficiency is high, the hair line that the outward appearance of product is more beautiful, sticking power is stronger, can keep product appearance preferably, can reach the performance of powder body coating simultaneously.
[accompanying drawing explanation]
Fig. 1 illustrates the schema of magnesium alloy high anti-corrosion surface treatment method of the present invention.
[embodiment]
For object of the present invention, method steps and function are had to further understanding, refer to Fig. 1, and be described in detail as follows.
In order to achieve the above object, the invention provides a kind of magnesium alloy high anti-corrosion surface treatment method, it comprises the following steps:
Step 101: by after magnesium alloy pressure-casting moulding, machinery is removed burr, and the magnesium-alloy material after moulding is done Kongfu, and obtains qualified magnesium-alloy material;
Step 102: by the magnesium-alloy material after above-mentioned processing when temperature is 55 ℃, soaking and washing 3～5min in alkaline defatting agent, remove its surperficial grease and dirty, wherein said alkaline defatting agent comprises that concentration is the sodium phosphate of 10～15g/L and the Sodium dodecylbenzene sulfonate that concentration is 1g/L;
Step 103: by the magnesium-alloy material after above-mentioned skimming treatment when temperature is 40 ℃, in acid-wash activation agent, activate 60s, remove the oxide compound on magnesium-alloy material surface, obtain surface uniformly, wherein said acid-wash activation agent comprises that concentration is the nitric acid that the citric acid of 10～15g/L and lactic acid that concentration is 15～20g/L and concentration are 10～15g/L;
Step 104: the magnesium-alloy material after above-mentioned activation, when temperature is 50 ℃, is soaked to 60s in the NaOH solution that is 5% carry out neutralizing treatment at massfraction;
Step 105: the magnesium-alloy material after neutralizing treatment is carried out to wire drawing processing, make the surface of product there is gloss or the texture of metal;
Step 106: the magnesium-alloy material after above-mentioned wire drawing is processed carries out Passivation Treatment 30s when temperature is 50 ℃; at Mg alloy surface, form the preliminary protective membrane of one deck; the effect of sticking power protected and increases by this protective membrane when ability cathode electrophoresis; wherein the mixed solution of Passivation Treatment comprises that concentration is the sustained release dosage that the oxidizing acid of 1～3g/L and complexing agent that concentration is 3～6g/L and concentration are 1～2g/L, and wherein oxidizing acid used is HNO
3, complexing agent is citric acid, sustained release dosage is benzotriazole;
Step 107: the magnesium-alloy material after above-mentioned steps 106 Passivation Treatment is toasted;
Step 108: the magnesium-alloy material of above-mentioned baking is carried out to ability cathode electrophoresis processing, wherein the control voltage of electrophoretic process is 50～70V, conductance is 600～900 μ m/cm, treatment time is 30～90s, electrophoretic paint is LF-3 varnish and TE139 mill base, and the curing amount of electrophoresis groove liquid is 8～12%;
Step 109: being under 80～100 ℃ of conditions after prebake conditions 10min by the magnesium-alloy material after above-mentioned electrophoretic process in temperature, is slaking 30～40min under 160 ℃ of conditions in temperature.
Wherein, described step 103 and 104 is carried out respectively 2 times.
The present invention also provides the surface treatment of a kind of magnesium alloy high anti-corrosion its product, and it is the product producing after above-mentioned magnesium alloy high anti-corrosion surface treatment method is processed, and the thickness of one deck paint film wherein forming after the surperficial electrophoretic process of this product is 12～20 μ m.
Refer to following table, following table is the performance test table of the product of generation after magnesium alloy high anti-corrosion surface treatment method of the present invention is processed:
Compared to prior art, magnesium alloy high anti-corrosion surface treatment method of the present invention and products thereof, by diecast magnesium alloy being carried out to the processing such as wire drawing, passivation, electrophoretic painting, make that its processing procedure is short, efficiency is high, the hair line that the outward appearance of product is more beautiful, sticking power is stronger, can keep product appearance preferably, can reach the performance of powder body coating simultaneously.
Be pointed out that, the invention is not restricted to above-mentioned embodiment, any simple modification, equivalent variations and modification that any those skilled in the art do above-described embodiment based on technical solution of the present invention, all fall within the scope of protection of the present invention.
Claims (17)
1. the invention provides a kind of magnesium alloy high anti-corrosion surface treatment method, it is characterized in that, it comprises the following steps:
(1) magnesium-alloy material of die cast is carried out to pre-treatment;
(2) in alkaline defatting agent to pretreated magnesium-alloy material degreasing;
(3) magnesium-alloy material after adopting acid-wash activation agent to degreasing activates;
(4) magnesium-alloy material after activation is soaked to carry out neutralizing treatment in strong base solution;
(5) magnesium-alloy material after neutralizing treatment is carried out to wire drawing processing;
(6) magnesium-alloy material after wire drawing processing is carried out to Passivation Treatment;
(7) ability cathode electrophoresis processing is carried out on the magnesium-alloy material surface after Passivation Treatment.
2. magnesium alloy high anti-corrosion surface treatment method according to claim 1, it is characterized in that, the pre-treatment of described step (1) is removed burr for magnesium-alloy material surface being carried out to mechanical mill, then product surface is done Kongfu, and obtains qualified magnesium-alloy material.
3. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, in described step (2): the temperature of grease-removing agent is 50 ℃; Degreasing time is 3～5min.
4. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, described step (2) neutral and alkali grease-removing agent comprises that concentration is the sodium phosphate of 10～15g/L and the Sodium dodecylbenzene sulfonate that concentration is 1g/L.
5. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, in described step (3): the temperature of acid-wash activation agent is 40 ℃; Soak time is 60s.
6. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, acid-wash activation agent comprises that concentration is the nitric acid that the citric acid of 10～15g/L and lactic acid that concentration is 15～20g/L and concentration are 10～15g/L in described step (3).
7. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, in described step (4): strong base solution is that massfraction is 5% NaOH solution; Soak time is 60s.
8. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, in described step (6): the temperature of Passivation Treatment is 50 ℃; Passivation time is 30s.
9. magnesium alloy high anti-corrosion surface treatment method according to claim 1, it is characterized in that, the mixed solution of Passivation Treatment comprises that concentration is the sustained release dosage that the oxidizing acid of 1～3g/L and complexing agent that concentration is 3～6g/L and concentration are 1～2g/L in described step (6).
10. magnesium alloy high anti-corrosion surface treatment method according to claim 1, is characterized in that, in described step (6): oxidizing acid is HNO3; Complexing agent is citric acid; Sustained release dosage is benzotriazole.
11. magnesium alloy high anti-corrosion surface treatment methods according to claim 1, is characterized in that, afterwards, step (7) before, comprises a step (8) to described step (6): the magnesium-alloy material after above-mentioned steps (6) Passivation Treatment is toasted.
12. magnesium alloy high anti-corrosion surface treatment methods according to claim 1, is characterized in that, in described step (7): the control voltage of electrophoretic process is 50～70V, conductance is 600～900 μ m/cm, and the treatment time is 30～90s; Electrophoretic paint is LF-3 varnish and TE139 mill base; The curing amount of electrophoresis groove liquid is 8～12%.
13. magnesium alloy high anti-corrosion surface treatment methods according to claim 1, is characterized in that, described step (7) afterwards, comprises a step (9): the magnesium-alloy material after electrophoretic process is toasted and slaking.
14. magnesium alloy high anti-corrosion surface treatment methods according to claim 13, is characterized in that, in described step (9): storing temperature is 80～100 ℃, baking time is 10min; Curing temperature is 160 ℃, and the curing time is 30～40min.
15. magnesium alloy high anti-corrosion surface treatment methods according to claim 1, is characterized in that, described step (3) and step (4) are carried out respectively 2 times.
16. 1 kinds of magnesium alloy high anti-corrosion surface treated products, it is the product producing after the magnesium alloy high anti-corrosion surface treatment method processing as described in any one in claim 1～15.
17. magnesium alloy high anti-corrosion surface treatment methods according to claim 16, is characterized in that, the thickness of one deck paint film that described product surface forms is 12～20 μ m.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911648A (en) * | 2014-04-03 | 2014-07-09 | 中信戴卡股份有限公司 | Magnesium alloy wheel pretreatment technology |
| CN107268063A (en) * | 2017-07-07 | 2017-10-20 | 东莞宜安科技股份有限公司 | A kind of electrophoresis method of diecasting alloys |
| CN107354499A (en) * | 2017-08-08 | 2017-11-17 | 浙江新祥铝业股份有限公司 | A kind of processing method of the coloured electrophoresis section bar of wire drawing |
| CN109537011A (en) * | 2018-12-06 | 2019-03-29 | 上海众新五金有限公司 | A kind of auto parts and components electroplate technology |
| CN112496691A (en) * | 2019-09-16 | 2021-03-16 | 华硕电脑股份有限公司 | Metal shell surface treatment method |
| CN113829003A (en) * | 2020-06-23 | 2021-12-24 | 宏碁股份有限公司 | Casing and manufacturing method thereof |
| CN115449791A (en) * | 2022-08-24 | 2022-12-09 | 江苏和兴汽车科技有限公司 | Method for improving corrosion resistance of die-cast aluminum |
| US11778766B2 (en) | 2020-05-26 | 2023-10-03 | Acer Incorporated | Casing and manufacturing method thereof |
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| JP2000345370A (en) * | 1999-06-07 | 2000-12-12 | Ueda Alumite Kogyo Kk | Surface treatment of magnesium or magnesium alloy |
| CN101423967A (en) * | 2007-10-31 | 2009-05-06 | 比亚迪股份有限公司 | Surface treating method of aluminum alloy material |
| CN102114750A (en) * | 2010-01-04 | 2011-07-06 | 中镁科技（上海）有限公司 | Manufacture method for appearence of magnesium alloy |
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Patent Citations (3)
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| JP2000345370A (en) * | 1999-06-07 | 2000-12-12 | Ueda Alumite Kogyo Kk | Surface treatment of magnesium or magnesium alloy |
| CN101423967A (en) * | 2007-10-31 | 2009-05-06 | 比亚迪股份有限公司 | Surface treating method of aluminum alloy material |
| CN102114750A (en) * | 2010-01-04 | 2011-07-06 | 中镁科技（上海）有限公司 | Manufacture method for appearence of magnesium alloy |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911648A (en) * | 2014-04-03 | 2014-07-09 | 中信戴卡股份有限公司 | Magnesium alloy wheel pretreatment technology |
| CN107268063A (en) * | 2017-07-07 | 2017-10-20 | 东莞宜安科技股份有限公司 | A kind of electrophoresis method of diecasting alloys |
| CN107354499A (en) * | 2017-08-08 | 2017-11-17 | 浙江新祥铝业股份有限公司 | A kind of processing method of the coloured electrophoresis section bar of wire drawing |
| CN109537011A (en) * | 2018-12-06 | 2019-03-29 | 上海众新五金有限公司 | A kind of auto parts and components electroplate technology |
| CN112496691A (en) * | 2019-09-16 | 2021-03-16 | 华硕电脑股份有限公司 | Metal shell surface treatment method |
| US11778766B2 (en) | 2020-05-26 | 2023-10-03 | Acer Incorporated | Casing and manufacturing method thereof |
| CN113829003A (en) * | 2020-06-23 | 2021-12-24 | 宏碁股份有限公司 | Casing and manufacturing method thereof |
| CN115449791A (en) * | 2022-08-24 | 2022-12-09 | 江苏和兴汽车科技有限公司 | Method for improving corrosion resistance of die-cast aluminum |
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