CN1388272A - Composite ceramic film on surface of magnesium alloy and its forming process - Google Patents
Composite ceramic film on surface of magnesium alloy and its forming process Download PDFInfo
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Abstract
The present invention features that the composite ceramic film consists of two layers, the inner layer film of silicon-containing composite Mg-Al oxide and the outer layer film of Mg-Al silico-oxide of 5-70 micron thickness each. The composite ceramic film is formed through surface treatment, degreasing, neutralizing, water washing, micro-arc anodizing, water washing, drying, closing treatment or painting. The composite ceramic film has no holes and cracks, high corrosion resistance, high wear resistance and smooth surface.
Description
Affiliated field:
The present invention relates to composite ceramic film on surface of magnesium alloy and generation method, handle at Mg alloy surface generating the composite ceramics plasma membrane more precisely by micro-arc anodic oxidation.Belong to the Mg alloy surface process field.
Background technology:
Magnesium alloy is little because of its proportion, and the energy decrement coefficient is big, and advantages such as the good suitable die casting production in enormous quantities of capability of electromagnetic shielding more and more receive the concern in fields such as aerospace, electronics, automobile making.Particularly in recent years, obtained fast development in the application of high-grade magnesium goods such as notebook computer casing, digital camera, mobile phone, car component, market outlook are very wide.
But because the chemical property of magnesium is active, the magnesium goods must carry out suitable surface protection to be handled and can use.Mg alloy surface commonly used is handled chemical oxidation and anodic oxidation.The anodic oxidation of magnetism alloy film has better protection than chemical oxide film, and magnesium alloy has better solidity to corrosion after anodic oxidation treatment.But traditional chromatedsolution anodic oxidation not only contains chromium, does not meet environmental requirement, and exists rete thin, and solidity to corrosion reaches problems such as complex process inadequately.Therefore, develop that a kind of solidity to corrosion is more superior, the anodic oxidation of magnetism alloy technology of Chrome-free has become pressing for of high-grade magnesium goods application development.
Differential arc oxidation is a kind of new technology at non-ferrous metal surface in situ grow oxide ceramic film.Receive attention both domestic and external and concern just day by day.But, has only the differential arc oxidation of aluminium alloy to handle comparative maturity so far, and begun industrial applications, and the differential arc oxidation of magnesium alloy processing majority still is in the research and development.Chinese patent application CN 86108405; adopt alkalimetal silicate (as potassium silicate), alkali metal hydroxide (as potassium hydroxide); and fluorochemical (as hydrofluoric acid) is formed aqueous electrolysis liquid; making alive between magnesium goods in being dipped in electrolyte solution and auxiliary cathode; by spark discharge; form the pottery protective membrane at the magnesium product surface, the solidity to corrosion of magnesium goods, wear resistance are increased significantly.In addition, P.Kunze and E.D.Banerjee (Tratt.Finit., 1997,37 (3-4), P144-147) in inorganic aqueous solution, utilize micro-arc oxidation process to develop a kind of hard anodizing coating MAGOXID-COAT, it can form the ceramic oxides layer at Mg alloy surface.People such as Jiang Bailing (" Xi'an University of Technology's journal ", 16 (4), 2000, P324-329) studied the method for in silicate solutions, using differential arc oxidation and generated the magnesia ceramics layer at Mg alloy surface, can both significantly improve solidity to corrosion, the wear resistance of magnesium alloy.But the formed ceramic plasma membrane of these technology is the magnesia ceramics film, and quality is more crisp, and forms hole and crackle easily in rete.
Summary of the invention:
The objective of the invention is to, adopt differential of the arc anode treatment method to form high-quality pottery complex oxide film at Mg alloy surface.Specifically be to adopt carboxylate salt, organic and inorganic or composition silicate and film forming accelerating and deionized water composition electrolyte solution, form composite ceramics matter oxide film at Mg alloy surface by differential arc oxidation.It not only has good solidity to corrosion, wear resistance, and rete is very tough and tensile, and is firm with matrix bond.Characteristics of the present invention also are to add special inorganic and organic salt in electrolyte solution, can form chromatic ceramics matter oxide films such as oyster white, light orange, coffee color, silver gray at Mg alloy surface by differential arc oxidation, realize that one step of magnesium goods is painted.
Rete is formed and the performance detection result shows: the present invention forms two-layer polynary composite ceramics matter oxide film at Mg alloy surface, the fragility and the interior shortcoming that forms hole and crackle of rete of aforementioned arc differential oxide ceramic plasma membrane layer have been overcome, its solidity to corrosion and wear resistance have breakthrough raising than common chromic salt anode oxide film, and any surface finish, has color and luster attractive in appearance, be a kind of easy and simple to handle, can satisfy the Mg alloy surface of high-grade magnesium goods high-quality surface and performance requriements and handle new technology.To the processing and utilization of China's characteristic magnesium resource, help improving China mainly by the outlet magnesium alloy material and high-grade magnesium goods almost the passive situation of dependence on import is significant.
Microarc oxidation treatment process of the present invention is referred to as the SIMANODE micro-arc anodic oxidation again and handles.It can be divided into two portions.
1, pre-treating technology.
Magnesium alloy must carry out pre-treatment before surface treatment, the quality of pre-treatment is directly connected to the bonding force of surface coating, compactness, homogeneity and color.The purpose of pre-treatment is removed surperficial grease exactly, and oxide compound and other adhesions make the magnesium alloy component surface cleaning and have activity, for subsequently differential arc oxidation is ready to condition.
The pre-treating technology condition is:
A). the degreasing decontamination is handled and is used RR-601 efficient cleaner (Shanghai Metal Corrosion ﹠. Protection Techn Co., Ltd's production) to clean (preferably adopting ultrasonic cleaning), 25-40 ℃, 3-15min.
B). adjust to handle on the surface is neutralizing treatment in RR-603 surface conditioner (Shanghai Metal Corrosion ﹠. Protection Techn Co., Ltd's production) solution, and condition is a temperature: 25-40 ℃, time 30-200 second.
2, the SIMANODE micro-arc anodic oxidation is handled electrolytic solution and treatment process condition
The electrolytic solution that micro-arc anodic oxidation is handled by organic and inorganic or composition silicate, carboxylate salt (acetate, lactic acid, citric acid, etc. the salt of carboxylic acid), compositions such as film forming accelerating, tinting material and deionized water.
Consisting of of solution: tetraethyl silicate (or aluminum fluosilicate, in the organic and inorganic salt such as Sodium Silicofluoride or potassium silicofluoride a kind of or
Composition silicate) 10-300g/l carboxylate salt (as: acetate, lactic acid, tartrate, phenylformic acid, citric acid, one or more of the salt of terephthalic acid etc.) 10-200g/lNaOH highly basic such as (or) KOH 5-150g/l film forming accelerating is as phosphoric acid salt, metaborate, fluorochemical, silicofluoride, a kind of in the fluoaluminate, the 1-50g/l tinting material (organic or inorganic salt, as: potassium permanganate, nickelous nitrates etc.) the 1-50g/l deionized water is an amount of
* annotate: tetraethyl silicate is to add with the hydrolyzed solution form, the preparation oxidizing solution.The processing condition that the SIMANODE micro-arc anodic oxidation is handled are: be anode with the magnesium alloy product, insoluble inert metals such as stereotype or stainless steel be negative electrode in above-mentioned electrolyte solution, execute imposing pulse or alternating-current carries out oxide treatment between anode and cathode.Processing parameter is:
Voltage: 25～400V
Temperature: 10～60 ℃
Time: 1～30 minute
PH value: 8～14
3, the performance of composite ceramics plasma membrane is as shown in table 1
According to pottery oxide thickness that treatment process provided by the invention generated generally between 5-70 μ m, and the thickness of ceramic plasma membrane can generate 100 μ m or thicker rete on the magnesium alloy product surface as required along with oxidation treatment time prolongation and increase gradually.Table 1, micro-arc anodic oxidation of the present invention are handled and chromic salt anodic oxidation treatment performance comparison
# annotates: DOW17 is a kind of magnesium alloy surface treatment of the U.S. Dow chemical company that is widely adopted.
| Project | The SIMANODE micro-arc anodic oxidation | DOW17 #The chromic salt anodizing |
| Outward appearance | Evenly, complete, bright and clean oyster white, light orange, coffee color | Evenly, complete celandine green |
| Erosion rate (g/m 2·h) | ????0.059 | ????0.156 |
| Microhardness (Hv) | ????412 | ????148 |
| The paint film tack | ????100/100 | ????99/100 |
The micro-arc oxidation films that the present invention makes at the AZ91 Mg alloy surface is divided into two-layer compound pottery oxide film.Outer membrane is the Si oxide that contains Mg, Al, and inner layer film is siliceous Mg, Al composite oxide layer, ceramic plasma membrane densification, bright and clean, firm with matrix bond.Elementary composition and XRD phase composite analytical results such as Fig. 2, Fig. 3 and shown in Figure 4 of the microstructure of micro-arc oxidation films, ectonexine.
Description of drawings:
Fig. 1, SIMANODE microarc oxidation treatment process flow process.
The microstructure of Fig. 2, SIMANODE micro-arc oxidation films (x1000)
The elementary composition energy spectrum analysis of the ectonexine of Fig. 3, SIMANODE micro-arc oxidation films a), can spectrogram for inner layer film, be siliceous Mg, Al composite oxide layer, analysis position marks in the drawings.B), can spectrogram for outer membrane, be the Si oxide of Mg, Al, analysis position marks in the drawings.
The XRD phase composite of Fig. 4, SIMANODE micro-arc oxidation films is analyzed, and X-coordinate is 2 θ, and ordinate zou is an intensity.
Embodiment:
By following 6 embodiment, further to illustrate inner characteristic of the present invention and marked improvement.
Embodiment 1,
Sample pre-treatments technology is with the degreasing 10 minutes in 35 ℃ RR-601 clean-out system of AZ91 magnesium alloy pressure-casting sample; Then, 30 ℃ RR-603 surface conditioner solution neutralizing treatment 30 seconds, carry out twice washing back again and implement oxide treatment.Electrolyte solution is formed:
Silicate hydrolyzate liquid 120g/l
Trisodium Citrate 50g/l
NaOH??????????????????????????????50g/l
Potassium lactate 15g/l
Na
3PO
4?????????????????????????10g/l
Sodium metaborate 10g/l
With NaOH regulator solution pH value to 12 differential arc oxidation: 35 ℃ of temperature; Voltage 100V; 10 minutes film qualities: oyster white, even, complete, bright and clean rete, ectonexine total thickness 40 μ m.
Sample pre-treatments technology is with the ultrasonic degreasing 15 minutes in 30 ℃ RR-601 clean-out system of AZ91 magnesium alloy pressure-casting sample; Then, 25 ℃ RR-603 surface conditioner solution neutralizing treatment 50 seconds, and carry out twice washing back and implement oxide treatment.Electrolyte solution consists of:
Potassium silicate 100ml/l
Trisodium Citrate 50g/l
NaOH?????????????????????50g/l
Sodium acetate 10g/l
Na
3PO
4???????????????????10g/l
NaF?????????????????????????2g/l
Electrolyte solution consists of:
Water glass 80g/l
Seignette salt 70g/l
Sodium.alpha.-hydroxypropionate 10g/l
Na
3PO
4???????????????????10g/l
NaOH????????????????????????20g/l
PH value 11
Pre-treatment condition and embodiment 2 are basic identical.Differential arc oxidation: 45 ℃ of temperature; Voltage 90V; 4 minutes time film quality: Melon yellow look, even, complete, bright and clean rete, ectonexine total thickness 24 μ m.
Embodiment 4, electrolyte solution consist of:
Aluminum fluosilicate 100g/l
Potassium lactate 50g/l
Seignette salt 20g/l
Sodium metaborate 20g/l
PH value 9 pre-treatment conditions and embodiment 2 are basic identical.Differential arc oxidation: 40 ℃ of temperature; Voltage 120V; 10 minutes time film quality: silvery white, even, complete, bright and clean rete, ectonexine total thickness 38 μ m.
Tetraethyl silicate 80g/l
Trisodium Citrate 60g/l
Para-phthalic sodium 10g/l
Sodium metaborate 20g/l
Tinting material (potassium permanganate etc.) 10g/l
PH value 13 pre-treatment conditions and embodiment 2 are basic identical.Differential arc oxidation: 35 ℃ of temperature; Voltage 100V; 10 minutes time film quality: coffee-like, even, complete, bright and clean rete, ectonexine total thickness 43 μ m.Embodiment 6, electrolyte solution consist of:
Aluminum fluosilicate 80g/l
Sodium.alpha.-hydroxypropionate 60g/l
Sodium Benzoate 10g/l
NaOH??????????????????????20g/l
Tinting material (nickelous nitrate etc.) 5g/l
PH value 11 pre-treatment conditions and embodiment 2 are basic identical.Differential arc oxidation: 40 ℃ of temperature; Voltage 90V; 10 minutes time film quality: silver gray, even, complete, bright and clean rete, ectonexine total thickness 40 μ m.
Claims (6)
1, a kind of composite ceramic film on surface of magnesium alloy is characterized in that it by inside and outside two-layer the composition, and its inner compact layer is complete, with the matrix metallurgical binding; It is outer hard smooth, and ectonexine is in conjunction with constituting the composite ceramics plasma membrane.For general Mg-Al alloy, its inner layer film is siliceous Mg, Al composite oxide layer, and outer membrane is the Si oxide of Mg, Al.
2, according to the described composite ceramic film on surface of magnesium alloy of claim 1, it is characterized in that described pottery oxide thickness is generally between 10-70 μ m, and the thickness of ceramic plasma membrane can generate 100 μ m or thicker rete on the magnesium alloy product surface as required along with oxidation treatment time prolongation and increase gradually.
3, a kind of generation method of composite ceramic film on surface of magnesium alloy is characterized in that:
(1), the pre-treating technology condition is:
(a). the degreasing decontamination is handled and is used the RR-601 efficient cleaner to clean, and condition is 25-40 ℃, 3-15min;
(b). adjust to handle on the surface is neutralizing treatment in RR-603 surface conditioner solution, and condition is 25-40 ℃, 30-200 second.
(2), micro-arc anodic oxidation is handled
(a). consisting of of the electrolytic solution that micro-arc anodic oxidation is handled:
Tetraethyl silicate, or aluminum fluosilicate, or Sodium Silicofluoride, or in the potassium silicofluoride a kind of organic or
Inorganic salt or composition silicate 10-300g/l
Carboxylate salt, or one or more 10-200g/lNaOH of the salt of acetate, lactic acid, tartrate, phenylformic acid, citric acid, terephthalic acid etc., or KOH highly basic 5-150g/l film forming accelerating is a phosphoric acid salt, metaborate, fluorochemical, a kind of 1-50g/l tinting material is that potassium permanganate or nickelous nitrate 1-50g/l deionized water are an amount of in silicofluoride, the fluoaluminate
(b). the processing condition that micro-arc anodic oxidation is handled are:
Voltage: 25～400V
Temperature: 10～60 ℃
Time: 1～30 minute
PH value: 8～14
4,, it is characterized in that it is ultrasonic cleaning that described clean-out system cleans according to right 3 described composite ceramic film on surface of magnesium alloy generation methods.
5, according to right 3 or 4 described composite ceramic film on surface of magnesium alloy generation methods, it is characterized in that it is to be anode with the magnesium alloy product that the micro-arc anodic oxidation that is carried out is handled, the insoluble inert metal of stereotype or stainless steel is a negative electrode, in electrolyte solution, impose pulse or alternating-current between anode and cathode and carry out oxide treatment.
6,, it is characterized in that at the once painted formation oyster white of Mg alloy surface, light orange, coffee color, silver gray pottery plasma membrane by the described composite ceramic film on surface of magnesium alloy of claim 3 generation method.
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| EP1606107A4 (en) * | 2003-03-25 | 2008-04-23 | Olimex Group Inc | Composite article comprising a ceramic coating |
| CN101748468B (en) * | 2010-01-25 | 2011-10-19 | 哈尔滨工业大学 | Preparation method of thermal control coating with high solar absorption factor and high emissivity on magnesium alloy surface |
| CN101736388B (en) * | 2010-01-25 | 2012-02-08 | 哈尔滨工业大学 | Method for preparing heat control coating layer on surface of magnesium alloy |
| CN103088390A (en) * | 2013-02-06 | 2013-05-08 | 惠州市裕元华阳精密部件有限公司 | Surface treatment method for magnesium alloy metal body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5928638B2 (en) * | 1981-06-24 | 1984-07-14 | デイツプソ−ル株式会社 | Method of forming a colored protective film on the surface of magnesium material |
| CN86108405A (en) * | 1985-10-25 | 1988-05-18 | 奥托·科萨克 | The solution and coating method of magnesium goods and used electrolytic solution |
| JPS63277793A (en) * | 1987-05-08 | 1988-11-15 | Ube Ind Ltd | Anodic oxidizing solution for magnesium or alloy thereof |
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- 2002-04-27 CN CNB021115214A patent/CN100342063C/en not_active Expired - Fee Related
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| CN101748468B (en) * | 2010-01-25 | 2011-10-19 | 哈尔滨工业大学 | Preparation method of thermal control coating with high solar absorption factor and high emissivity on magnesium alloy surface |
| CN101736388B (en) * | 2010-01-25 | 2012-02-08 | 哈尔滨工业大学 | Method for preparing heat control coating layer on surface of magnesium alloy |
| US9682176B2 (en) | 2011-11-07 | 2017-06-20 | DePuy Synthes Products, Inc. | Lean electrolyte for biocompatible plasmaelectrolytic coatings on magnesium implant material |
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| CN103614762A (en) * | 2013-12-05 | 2014-03-05 | 桂林电子科技大学 | Method for preparing magnesium alloy with micro-arc oxidation ceramic membrane |
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| CN108165965A (en) * | 2017-12-27 | 2018-06-15 | 北京涌阔科技有限公司 | A kind of preparation method of magnesium alloy anticorrosion composite membrane |
| CN108165965B (en) * | 2017-12-27 | 2019-11-26 | 温岭市合丰鞋材有限公司 | A kind of preparation method of magnesium alloy anticorrosion composite membrane |
| CN110219031A (en) * | 2019-06-06 | 2019-09-10 | 北京航空航天大学 | Anodic oxidation electrolyte and method, the aluminum or aluminum alloy with anode oxide film |
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