CN1239755C - Process for treating surface of Mg alloy - Google Patents
Process for treating surface of Mg alloy Download PDFInfo
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- CN1239755C CN1239755C CN 01109763 CN01109763A CN1239755C CN 1239755 C CN1239755 C CN 1239755C CN 01109763 CN01109763 CN 01109763 CN 01109763 A CN01109763 A CN 01109763A CN 1239755 C CN1239755 C CN 1239755C
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Abstract
The present invention relates to a process for treating the surface of Mg alloy, which comprises the following steps: a Mg alloy casting is prepared and is polished by electric arcs, wherein the Mg alloy is electrically connected to a positive electrode and is immersed into an electrolytic tank containing electrolyte; a tank body of the electrolytic tank is electrically connected to a negative electrode, so the electrolyte is provided with negative charges; the operating voltage, the operating current and the operating temperature of the electrolytic tank is arranged under an operating condition, a plurality of continuous air bubbles are generated and are tightly adjacent to the surface of the Mg alloy casting; thus, a continuous air film is formed between the surface of the Mg alloy casting and the electrolyte. A gap formed by the air film is enough to make an electric arc generate between the surface of the Mg alloy casting and the electrolyte. The surface of the Mg alloy casting is impacted in order to polish the Mg alloy casting.
Description
The present invention relates to a kind of surface treatment method of Mg alloy, particularly relate to a kind of via after the electric arc polishing again through the surface treatment method of Mg alloy of vacuum splashing and plating and anodic oxidation.
Because in light weight, magnesium alloy is widely used in air material.Magnesium alloy also was used in a large number and was made notebook computer and some electronic product shell recent years.To make notebook computer casing is example, and magnesium alloy is behind the type of being cast into, and its thick embryo surface is understood unfairness, and can be formed with burr and husky hole.Traditionally, the polishing of this thick embryo, deflashing and fill up follow-up processing such as Sha Kong need to drop into sizable manpower and expend the considerable time, increase problem and the cost made.In addition, the past magnesium alloy is before japanning, and its surface must be handled through chromic acid or phosphoric acid epithelium usually, can be by the protective membrane of 72 hours SaltSprayTests to form one deck.Because the use of chromic acid can cause the problem in the environmental protection, this area mostly adopts phosphoric acid to handle at present.But, when using phosphoric acid,, often can't pass through SaltSprayTest in the inferior quality of the formed protective membrane of Mg alloy surface.
Therefore, purpose of the present invention just provides a kind of surface treatment method of Mg alloy that can overcome above-mentioned shortcoming.
For this reason, the invention provides a kind of surface treatment method of Mg alloy, this method comprises following step: prepare a Mg alloy castings; Electric arc polishes this Mg alloy castings, wherein this Mg alloy castings is electrically connected to positive electrode, and being dipped into one contains in the electrolyzer of electrolytic solution, and this electrolyzer cell body is electrically connected to a negative potential, make this electrolytic solution have negative charge, the operating voltage of this electrolyzer, actuating current and service temperature are to be set to make the surface of this Mg alloy castings produce chemical reaction under the operational condition, and the surface at this Mg alloy castings of next-door neighbour produces most continuous air bubbles, thereby between the surface of this Mg alloy castings and this electrolytic solution, form a continuity air film, the formed gap of this air film just is enough to make and produces electric arc between the surface of this Mg alloy castings and this electrolytic solution, clash into the surface of this Mg alloy castings, and reach this Mg alloy castings of polishing.
The present invention is described in detail below in conjunction with embodiment and accompanying drawing:
To be a method according to this invention immerse synoptic diagram in the electrolyzer at next Mg alloy castings of switch-on regime not to Fig. 1.
Fig. 2 is the synoptic diagram that produces a gap between electrolyzer among Fig. 1 and this Mg alloy castings under switch-on regime.
The present invention finds that Mg alloy castings can be thrown by form an electric arc in electrolytic cell Light, and all excellent via surface roughness and the surface reflectivity of the Mg alloy castings of above-mentioned electric arc polishing In via traditional electrolysis polishor.
Such as Fig. 1 and shown in Figure 2, the present invention proposes a kind of new surface treatment method of Mg alloy, should Method comprises following step: prepare a Mg alloy castings 10; Electric arc polishes this Mg alloy castings 10, wherein this Mg alloy castings 10 is electrically connected to positive electrode, and is dipped into one and contains electricity Separate in the electrolytic cell 12 of liquid 13, and these electrolytic cell 12 cell bodies are electrically connected to a negative electrode, So that this electrolyte 13 is with negative electrical charge, the operating voltage of this electrolytic cell 12, operating current and behaviour To be set under the operating condition so that the surface of this Mg alloy castings 10 to produce chemistry as temperature Reaction, and at the most continuous air bubbles 15 of the surface of this Mg alloy castings 10 of next-door neighbour generation,, thereby Between the surface of this Mg alloy castings 10 and this electrolyte 13, form a continuity air film 11, These air film 11 formed gaps just are enough to so that the surface of this Mg alloy castings 10 and this electrolyte Produce electric arc between 13, clash into the surface of this Mg alloy castings 10, and reach this magnesium alloy of polishing The purpose of foundry goods 10. In above-mentioned electric arc polishing process, this Mg alloy castings 10 is lip-deep protruding Rise partly and burr through this electric arc bump and flattened. Simultaneously, on these Mg alloy castings 10 surfaces Oil stain, particulate and oxide etc. also removed in the lump. Mg alloy castings 10 through this electric arc polishing Form a smooth smooth minute surface.
The employed electrolyte of this electrobrightening can be 3% to 7% oxalic acid, and this operating voltage Scope be 200 to 350V, the scope of this operating current is 150 to 230A, this operating temperature Scope be 50 to 120 ℃. Preferably, this electrolyte is 4% to 6% oxalic acid, and this operates electricity The scope of pressing is 250 to 300V, and the scope of this operating current is 170 to 190A, and this operate warm The scope of degree is 80 to 100 ℃. More preferably, this electrolyte is 4% to 6% oxalic acid, this behaviour The scope of making voltage is 250 to 300V, and the scope of this operating current is 170 to 190A, this behaviour The scope of making temperature is 80 to 100 ℃, and the operating time is 1 to 3 minute.
Surface treatment method of Mg alloy of the present invention can comprise one again and plate the step that a thickness is 5 to 10 μ m aluminium laminations at this on the surface of the Mg alloy castings 10 of electric arc polishing.This aluminized step can be reached by a kind of mode of vacuum splashing and plating.The employed equipment of this vacuum splashing and plating mode can be general vacuum splashing and plating equipment, and its operating voltage range is 80 to 120V, and the actuating current scope is, 50 to 90A, and operating temperature range is 30 to 70 ℃.
Surface treatment method of Mg alloy of the present invention can also comprise a step that forms a hard aluminium sesquioxide layer in containing the electrolyzer of electrolytic solution with this aluminium lamination anodic oxidation and on the surface of this Mg alloy castings 10 again.The electrolytic solution of this anodic oxidation electrolyzer can be 1% to 7% oxalic acid, and operating voltage range is 0 to 100V, and the actuating current scope is 0 to 0.5A, and operating temperature range is 15 to 50 ℃.
The present invention finds, can pass through harsh SaltSprayTest via this Mg alloy castings 10 that forms the aluminium sesquioxide layer after the electric arc polishing again, and this aluminium sesquioxide layer has outstanding adherence simultaneously, can provide paint to be attached to the interface of this Mg alloy castings 10.
The present invention will illustrate in greater detail in following embodiment, and this embodiment is not as limiting the scope of the invention.
Embodiment 1
The electric arc polishing
One Mg alloy castings is immersed one to be contained in the electrolyzer of 5% oxalic acid and carries out the electric arc polished finish.The operating voltage of this electrolyzer is 300V, and actuating current is 180A, and service temperature is 95 ℃, and the operating time is 2 minutes.
Vacuum splashing and plating
This Mg alloy castings through the electric arc polishing is inserted in the vacuum splashing and plating equipment.The operating voltage of this vacuum splashing and plating equipment is 100V, and actuating current is 70A, and service temperature is 30 ℃, and the operating time is 30 minutes.So obtain the aluminium lamination that a thickness is 7 μ m.
Anodic oxidation
This is immersed one through aluminized Mg alloy castings contains in the electrolyzer of 40g/ litre oxalic acid and carries out anodic oxidation treatment.The operating voltage of this anodic oxidation electrolyzer is 10V, and actuating current is 0.2A, and service temperature is 25 ℃, and the operating time is 60 minutes.
Surface treatment method of Mg alloy of the present invention can overcome known shortcoming such as time-consuming, environmental pollution, and improves the quality and the productive rate of product.
The present invention is not restricted to the described embodiments, and this embodiment is used for being illustrated, and it can have multiple different variation in the scope that following claim defined.
Claims (9)
1. a surface treatment method of Mg alloy is characterized in that, this method comprises following step:
Prepare a Mg alloy castings;
Electric arc polishes this Mg alloy castings, wherein this Mg alloy castings is electrically connected to positive electrode, and being dipped into one contains in the electrolyzer of 3% to 7% oxalic acid as electrolytic solution, and this electrolyzer cell body is electrically connected to a negative potential, make this electrolytic solution have negative charge, the scope of the operating voltage of this electrolyzer is 200 to 350V, the scope of this actuating current is 150 to 230A, the scope of this service temperature is 50 to 120 ℃, make the surface of this Mg alloy castings produce chemical reaction, and the surface at this Mg alloy castings of next-door neighbour produces most continuous air bubbles, thereby between the surface of this Mg alloy castings and this electrolytic solution, form a continuity air film, the formed gap of this air film just is enough to make and produces electric arc between the surface of this Mg alloy castings and this electrolytic solution, clash into the surface of this Mg alloy castings, and reach this Mg alloy castings of polishing.
2. the method for claim 1, wherein this electrolytic solution is 4% to 6% oxalic acid, and the scope of this operating voltage is 250 to 300V, and the scope of this actuating current is 170 to 190A, and the scope of this service temperature is 80 to 100 ℃.
3. the method for claim 1, wherein this electrolytic solution is 4% to 6% oxalic acid, and the scope of this operating voltage is 250 to 300V, and the scope of this actuating current is 170 to 190A, and the scope of this service temperature is 80 to 100 ℃, and the operating time is 1 to 3 minute.
4. the method for claim 1, wherein also comprise one and on the surface of the Mg alloy castings of electric arc polishing, plate the step of an aluminium lamination at this.
5. method as claimed in claim 4, wherein, the thickness of this aluminium lamination is 5 to 10 μ m.
6. method as claimed in claim 4, wherein, this aluminized step is a kind of mode of vacuum splashing and plating.
7. method as claimed in claim 6, wherein, the operating voltage range of this vacuum splashing and plating is 80 to 120V, and the actuating current scope is 50 to 90A, and operating temperature range is 30 to 70 ℃.
8. method as claimed in claim 5 wherein, also comprises a step that forms an aluminium sesquioxide layer in containing the electrolyzer of electrolytic solution with this aluminium lamination anodic oxidation and on the surface at this Mg alloy castings.
9. method as claimed in claim 8, wherein, the electrolytic solution of this anodic oxidation electrolyzer is 1% to 7% oxalic acid, and operating voltage range is 0 to 100V, and the actuating current scope is 0 to 0.5A, and operating temperature range is 15 to 50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01109763 CN1239755C (en) | 2001-04-10 | 2001-04-10 | Process for treating surface of Mg alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01109763 CN1239755C (en) | 2001-04-10 | 2001-04-10 | Process for treating surface of Mg alloy |
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| CN1379124A CN1379124A (en) | 2002-11-13 |
| CN1239755C true CN1239755C (en) | 2006-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01109763 Expired - Fee Related CN1239755C (en) | 2001-04-10 | 2001-04-10 | Process for treating surface of Mg alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101422872B (en) * | 2007-10-30 | 2010-05-26 | 昆明市凯跃机电塑料有限责任公司 | Air-flotation type mechanical polishing method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489797B (en) * | 2011-11-11 | 2013-11-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Machining device and method for polishing blade profile of integrated bladed disk |
| CN104674219A (en) * | 2015-03-25 | 2015-06-03 | 东莞仁海科技股份有限公司 | Novel technology for surface treatment of pressure casting |
| CN106077859A (en) * | 2016-06-30 | 2016-11-09 | 徐工集团工程机械有限公司 | Remove the method and device of metal works burr |
| CN106624230B (en) * | 2017-03-03 | 2018-11-20 | 徐工集团工程机械有限公司 | Metal works burr remover and method |
-
2001
- 2001-04-10 CN CN 01109763 patent/CN1239755C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101422872B (en) * | 2007-10-30 | 2010-05-26 | 昆明市凯跃机电塑料有限责任公司 | Air-flotation type mechanical polishing method |
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| Publication number | Publication date |
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| CN1379124A (en) | 2002-11-13 |
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