CN100371503C - Anodic rare-earth oxide membrane closing method of aluminium alloy - Google Patents

Anodic rare-earth oxide membrane closing method of aluminium alloy Download PDF

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CN100371503C
CN100371503C CNB2004100745415A CN200410074541A CN100371503C CN 100371503 C CN100371503 C CN 100371503C CN B2004100745415 A CNB2004100745415 A CN B2004100745415A CN 200410074541 A CN200410074541 A CN 200410074541A CN 100371503 C CN100371503 C CN 100371503C
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aluminium alloy
sealing
oxide film
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rare
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CN1746341A (en
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左禹
李启征
赵景茂
张晓丰
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Xiangxingtai Hardware Products (Shenzhen) Co., Ltd.
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Beijing University of Chemical Technology
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Abstract

The present invention relates to a rare earth closing method for aluminum alloy anodic oxidized films. The method is characterized in that after aluminum alloy is treated by anodic oxidation, a rare earth carbonate oversaturated aqueous solution is used as a closing solution to realize closing an aluminum alloy anodic oxidized film, which is processed under the condition of pH between 5.6 and 6.5 and temperature between 90 DEG C and 100 DEG C. The used rare earth carbonate is one kind or any two kinds of the composite rare earth carbonate of La2 (CO3) 3, Nd2 (CO3) 3, Ce2 (CO3) 3 and Pr2 (CO3) 3. The method is a treating method having the advantages of environmental protection, low cost and good corrosion resisting performance for closing aluminum alloy anodic oxidized films. The present invention has the advantages of low cost of closing solution, simple closing treating equipment, easy operation and low cost.

Description

Anodic rare-earth oxide membrane closing method of aluminium alloy
Technical field
The present invention relates to aluminium alloy anode oxide film is carried out the method for sealing treatment, special confining liquid adopts the sealing treatment method of rare earths salt.
Background technology
As everyone knows, aluminium alloy generates the micropore anode oxide film that thickness can be controlled through the peracid solutions anodic oxidation treatment at material surface.The sealing treatment of aluminium alloy anode oxide film is to reduce adsorptivity, improves the effective ways of solidity to corrosion and electrical insulating property.Usually, the sealing treatment method is with chemical process the micropore of anode oxide film to be stopped up.Employed confining liquid great majority have toxicity in the Process on Aluminum Alloy Oxidation Film closing process process of present industrial widespread use.By document (L.Hao, B.R.Cheng, Sealing processes of anodic coatings-past, present, and future, Metal Finishing.2000,12:8~18) report, the Ni that low temperature sealing (cold envelope) method adopts 2+-F -System (Ni 2+: 1.5~2g/l, F -: 450~650ppm) carried out sealing treatment 5~15 minutes to aluminum anodized film for about 5.5~6.5,30 ℃ in the pH value, then carried out maturation process 15 minutes in 60 ℃ water; Warm enclosure method also is to adopt Ni in the part 2+-F -System was carried out sealing treatment 15~40 minutes at 75~85 ℃ to aluminium alloy anode oxide film, NaF that confining liquid is contained and Ni 2+Serious toxicity is all arranged, harmful to HUMAN HEALTH and environment.Some high temperature closure method is to adopt potassium bichromate solution (potassium bichromate concentration 50~100g/l), in pH value 5~7,90~100 ℃ were carried out sealing treatment 10~15 minutes to aluminium alloy anode oxide film, wherein the hexavalent chromium of encapsulant generation is serious carcinogenic substance, and potassium bichromate is more expensive, and cost is higher.
Vapor Seal method and boiling water enclosure method are by the reaction of water and pellumina, generate boehmite and blocking microporous, thereby play a protective role.And though the Vapor Seal method is faster than boiling water enclosure method reaction, the treatment time is short, and the service temperature of Vapor Seal method needs supporting heating installation at 110~150 ℃, and energy consumption is big, and this just makes that cost increases greatly.
The time that anode oxide film carries out sealing treatment needs according to closure temperature in actually operating and aluminium alloy anode oxide film is thick adjusts.If thickness is thick more, need long more off-period; Closure temperature is low more, and need long more off-period.In actually operating, judge that the effect of sealing can be tested according to polarization curve.The boiling water sealing treatment, at 95~100 ℃, pH value 5.5~6.5, the heat-sealing hole speed of aluminium alloy anode oxide film approximately is 0.3~0.5 micron per minute.(see Zhu Zufang " progress of aluminum anodized film hole sealing technology ", " electroplate and cover with paint, lacquer, colour wash, etc. " 2000,19 (3): 32-37).
Summary of the invention
The objective of the invention is to propose the aluminium alloy anode oxide film sealing treatment method a kind of environmental protection, that cost is low, that solidity to corrosion is good.The present invention has changed in the traditional method and to use toxic material to make confining liquid, adopts carbonated rare earth salt supersaturated aqueous solution as confining liquid, and the confining liquid price is low, and sealing treatment equipment is simple, and processing ease is with low cost.
The technical scheme of a kind of anodic rare-earth oxide membrane closing method of aluminium alloy of the present invention is through after the anodic oxidation treatment with aluminium alloy; in the confining liquid of pH value 5.5~6.5, carry out sealing treatment; make aluminium alloy anode oxide film form the close and protect film; it is characterized in that: under 90~100 ℃ condition; supersaturated aqueous solution with carbonated rare earth salt is made confining liquid, realizes the sealing of aluminium alloy anode oxide film.
The optional La of carbonated rare earth salt of the present invention 2(CO 3) 3, Nd 2(CO 3) 3, Ce 2(CO 3) 3Or Pr 2(CO 3) 3In a kind of.
The preferred La of carbonated rare earth salt of the present invention 2(CO 3) 3, Nd 2(CO 3) 3, Ce 2(CO) 3Or Pr 2(CO 3) 3In any two kinds of composite carbon acid rare earth salt.
The aluminium alloy anode oxide film that the inventive method is suitable for is forging aluminium alloy oxide film, rust-preventing aluminum alloy oxide film, cast aluminium alloy oxide film or superhard aluminum alloy oxide film.
Anodic rare-earth oxide membrane closing method of aluminium alloy of the present invention is applicable to the sealing treatment of the anode oxide film of aluminium alloys such as wrought aluminium, cast aluminium, corrosion-resisting aluminium.Anode oxide film is to adopt traditional sulphuric acid anodizing technology to handle to obtain.The equipment of sealing mainly is made up of enclosed slot, thermostatic bath, heat equipment need be set.
The operating process of enclosure method of the present invention is as follows:
(1) preparation confining liquid: by adding every kind of carbonated rare earth salt 1 gram in 1 premium on currency, be mixed with supersaturated aqueous solution, use the vinegar acid for adjusting pH value between 5.5~6.5.
(2) sealing treatment: confining liquid is poured in the enclosed slot, with the working temperature of thermostatic bath heating confining liquid to setting.To put into confining liquid with the workpiece that ordinary method is handled the aluminium alloy anode oxide film that obtains, after sealing for some time, take out workpiece and dry, promptly obtain aluminium alloy anode oxide film through sealing treatment.
The polarization curve experiment of the aluminium alloy anode oxide film of sealing treatment is under the condition of room temperature, pH value 6.7, the mass concentration 3.5g/l NaCl aqueous solution, obtains polarization curve.Corrosive medium is a simulated seawater, can reflect the solidity to corrosion of aluminium alloy anode oxide film behind the sealing treatment with this understanding.
The principle of sealing treatment of the present invention and boiling water sealing treatment is similar, in the sealing treatment process, and in the aluminium alloy anode oxide film micropore, Al 2O 3With H 2Following reaction: Al takes place in O 2O 3+ H 2O → 2AlO (OH), the boehmite of generation are deposited in the anodic oxidation membrane micropore, to reach the effect that physics stops up the anodic oxidation membrane micropore; When also having other rare-earth saltss in the confining liquid, follow top reaction, part rare earth ion can react the generation rare earth compound and boehmite together is deposited in the hole, the deposition of rare earth compound has increased the solidity to corrosion of anode oxide film, and has better solidity to corrosion than the sealing oxide film that boiling water enclosure method and potassium bichromate enclosure method obtain.
Enclosure method of the present invention uses multiple nontoxic carbonated rare earth salt to replace original virose encapsulant, and human body and environment are not all had disadvantageous effect; The medicine of its drug price in the traditional technology (bichromate solutions valency and about 7 jiaos/liter, nickel acetate solution closes 3 jiaos/liter) is because the solubleness of rare-earth salts in water is extremely low.Every cubic metre of confining liquid drug expenditure market price is tens yuans only, amounts to every liter of a few minutes and consume heat energy few; Confining liquid can recycle.The present invention is because the carbonated rare earth salt that adopts all is slightly soluble salt (being that solubleness is less than 0.1 gram/100 ml waters) for water, and solubleness is extremely low.For the ease of operation, confining liquid is formulated as the supersaturation carbonated rare earth aqueous solution in use.Only need to add a spot of carbonated rare earth salt in every premium on currency and just can reach degree of super saturation, the carbonated rare earth salt amount of using seldom in use only needs to replenish to add entry, just can guarantee that solution is under oversaturated state, confining liquid is safeguarded simple, and duration of service is long.
Polarization curve behind the anodic oxidation membrane closure resulting anode oxidation membrane passivation current of the present invention is as can be seen compared much smaller with the resulting anode oxidation membrane passivation current of potassium bichromate enclosure method and boiling water enclosure method.Hence one can see that, and the anode oxide film that enclosure method of the present invention is handled has higher solidity to corrosion.
Description of drawings
Fig. 1 polarization curve comparison diagram that to be the forging aluminium alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a is the polarization curve of the embodiment of the invention 1 rare-earth salts sealing among the figure, and b is the polarization curve of Comparative Examples 1 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 2 boiling water sealing.
Fig. 2 polarization curve comparison diagram that to be the rust-preventing aluminum alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a is the polarization curve of the embodiment of the invention 2 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 3 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 4 boiling water sealing.
Fig. 3 polarization curve comparison diagram that to be the cast aluminium alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a represents the polarization curve of the embodiment of the invention 3 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 5 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 6 boiling water sealing.
Fig. 4 polarization curve comparison diagram that to be superhard aluminum alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a is the polarization curve of the embodiment of the invention 4 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 7 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 8 boiling water sealing.
Fig. 5 polarization curve comparison diagram that to be the duralumin oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a represents the polarization curve of the embodiment of the invention 5 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 9 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 10 boiling water sealing.
Fig. 6 polarization curve comparison diagram that to be the cast aluminium alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a represents the polarization curve of the embodiment of the invention 6 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 11 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 12 boiling water sealing.
Fig. 7 is the polarization curve comparison diagram that the cast aluminium alloy oxide film obtains with rare-earth salts enclosure method plural components of the present invention and one-component.Curve a represents the polarization curve that the embodiment of the invention 7 plural components obtain among the figure, and b is the polarization curve of embodiment 10 one-components, and c is the polarization curve of embodiment 11 one-components.
Fig. 8 polarization curve comparison diagram that to be the cast aluminium alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a represents the polarization curve of the embodiment of the invention 8 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 13 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 14 boiling water sealing.
Fig. 9 polarization curve comparison diagram that to be the cast aluminium alloy oxide film obtain with rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method and boiling water enclosure method.Curve a represents the polarization curve of the embodiment of the invention 9 rare-earth saltss sealing among the figure, and b is the polarization curve of Comparative Examples 15 potassium bichromate sealing, and c is the polarization curve of Comparative Examples 16 boiling water sealing.
Rare-earth salts confining liquid that the present invention adopts and dichromic acid confining liquid, nickel acetate confining liquid are relatively, and be not only nontoxic, and consumption is few, and cost is low.Rare-earth salts enclosure method of the present invention and Vapor Seal method compare facilities are simpler, more convenient operation.Rare-earth salts enclosure method of the present invention and potassium bichromate enclosure method, boiling water enclosure method from polarization curve more as can be known, the present invention is resultant, and must to seal anode oxide film littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, and the compound closure oxidation film corrosion resistance is higher.
Embodiment
For identical aluminum alloy materials, embodiment is identical with the anode oxidation process of Comparative Examples, and the operational condition of embodiment 1~embodiment 11 is as shown in table 1, and the operational condition of Comparative Examples 1~16 is as shown in table 2.Potassium bichromate enclosure method in the Comparative Examples, the potassium bichromate mass concentration that is adopted is 50g/l.With 15~20 microns of aluminium alloy anode oxide film thickness, treatment time be 30 minutes be that example further specifies the inventive method and compares with Comparative Examples.
Embodiment 1 forging aluminium alloy anodic rare-earth oxide membrane sealing method.
(1) material: forging aluminium alloy adopts GB LD7 aluminium alloy.
(2) anodic oxidation treatment:, go out after the optical processing in sulphuric acid soln (mass concentration is 250g/l) with 2A/dm with test piece polishing, alkali cleaning oil removing 2CURRENT OXIDATION 1 hour, with washed with de-ionized water, with scanning electron microscopic observation as can be known, obtain the about 20 microns anode oxide film of thickness.
(3) sealing treatment: according to the operation steps of enclosure method of the present invention, with 1 gram Nd 2(CO 3) 3With 1 gram La 2(CO 3) 3Add in 1 premium on currency, be made into Nd 2(CO 3) 3And La 2(CO 3) 3The confining liquid of supersaturated aqueous solution.Under 95 ℃ of temperature, the condition of 30 minutes off-periods, obtain aluminium alloy sealing anode oxide film.
Record polarization curve shown in a curve among Fig. 1.
Present embodiment and Comparative Examples 1, Comparative Examples 2 are relatively, as can be seen from Figure 1, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension that potassium bichromate sealing and boiling water seal, and this solidity to corrosion that compound closure anode oxide film that the present invention obtains just is described is higher.
Embodiment 2 rust-preventing aluminum alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the rust-preventing aluminum alloy of GB LF21 aluminium alloy.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 200g/l, obtains 18 microns anode oxide film.All the other working method are identical with embodiment 1 with processing condition.The polarization curve of gained such as a curve among Fig. 2.
Present embodiment and Comparative Examples 3, Comparative Examples 4 relatively, as can be seen from Figure 2, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 3 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 3.
Present embodiment and Comparative Examples 5, Comparative Examples 6 relatively, as can be seen from Figure 3, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, just sealing oxidation film corrosion resistance of explanation invention is higher for this.
Embodiment 4 super-hard aluminum alloys anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the super-hard aluminum alloys of GB LC4.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 180g/l, obtains 15 microns aluminum anodized film.Setting oil bath temperature is 90 ℃ of working temperatures, makes to carry out in the confining liquid that is enclosed in 90 ℃.All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 4.
Present embodiment and Comparative Examples 7, Comparative Examples 8 relatively, as can be seen from Figure 4, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 5 duralumin anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the duralumin of GB L Y12.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 180g/l, obtains 15 microns aluminum anodized film.Setting oil bath temperature is 100 ℃ of working temperatures, makes to carry out in the confining liquid that is enclosed in 100 ℃.All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 5.
Present embodiment and Comparative Examples 9, Comparative Examples 10 relatively, as can be seen from Figure 5, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 6 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is Ce 2(CO 3) 3And La 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 6.
Present embodiment and Comparative Examples 11, Comparative Examples 12 relatively, as can be seen from Figure 6, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 7 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is Ce 2(CO 3) 3And La 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 7.
Present embodiment and embodiment 10, embodiment 11 relatively, as can be seen from Figure 7, compound closure anode oxide film of the present invention is all littler than the blunt electric current of dimension of one-component sealing, this oxidation film corrosion resistance that just illustrates that the compound closure method obtains is higher.
Embodiment 8 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is Pr 2(CO 3) 3And Nd 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 8.
Present embodiment and Comparative Examples 13, Comparative Examples 14 relatively, as can be seen from Figure 8, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 9 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is Pr 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.A curve among the polarization curve of gained such as Fig. 9.
Present embodiment and Comparative Examples 15, Comparative Examples 16 relatively, as can be seen from Figure 9, present embodiment is resultant, and must to seal anode oxide film all littler than the blunt electric current of dimension of potassium bichromate and boiling water sealing, this just illustrates that sealing oxidation film corrosion resistance of the present invention is higher.
Embodiment 10 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is Ce 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.B curve among the polarization curve of gained such as Fig. 7.
Embodiment 11 cast aluminium alloy anodic rare-earth oxide membranes sealing method.
Aluminium alloy adopts the cast aluminium alloy of GB ZL201.Anodic oxidation treatment: the sulphuric acid soln mass concentration of using is 150g/l, obtains 15 microns aluminum anodized film.The rare-earth salts of joining confining liquid is La 2(CO 3) 3All the other working method are identical with embodiment 1 with processing condition.C curve among the polarization curve of gained such as Fig. 7.
Table 1
Embodiment Aluminium alloy Thickness of oxidation film (micron) The confining liquid component Working temperature (℃) Off-period (minute) The pH value Polarization curve
1 LD7 20 Nd 2(CO 3) 3、La 2(CO 3) 3 95 30 6.5 A curve among Fig. 1
2 LF21 18 Nd 2(CO 3) 3、La 2(CO 3) 3 95 30 6.5 A curve among Fig. 2
3 ZL201 15 Nd 2(CO 3) 3、La 2(CO 3) 3 95 30 6.5 A curve among Fig. 3
4 LC4 15 Nd 2(CO 3) 3、La 2(CO 3) 3 90 30 6.5 A curve among Fig. 4
5 LY12 15 Nd 2(CO 3) 3、La 2(CO 3) 3 100 30 6.5 A curve among Fig. 5
6 ZL201 15 Ce 2(CO 3) 3、La 2(CO 3) 3 95 30 6.5 A curve among Fig. 6
7 ZL201 15 Ce 2(CO 3) 3、La 2(CO 3) 3 95 30 6.5 A curve among Fig. 7
8 ZL201 15 Pr 2(CO 3) 3、Nd 2(CO 3) 3 95 30 6.5 A curve among Fig. 8
9 ZL201 15 Pr 2(CO 3) 3 95 30 6.5 A curve among Fig. 9
10 ZL201 15 Ce 2(CO 3) 3 95 30 6.5 B curve among Fig. 7
11 ZL201 15 La 2(CO 3) 3 95 30 6.5 C curve among Fig. 7
Table 2
Comparative Examples Aluminium alloy Thickness of oxidation film (micron) The confining liquid component Working temperature (℃) Off-period (minute) The pH value Polarization curve
1 LD7 20 Potassium bichromate 95 30 6.5 B curve among Fig. 1
2 LD7 20 Boiling water 100 30 6.5 C curve among Fig. 1
3 LF21 18 Potassium bichromate 95 30 6.5 B curve among Fig. 2
4 LF21 18 Boiling water 100 30 6.5 C curve among Fig. 2
5 ZL201 15 Potassium bichromate 95 30 6.5 B curve among Fig. 3
6 ZL201 15 Boiling water 100 30 6.5 C curve among Fig. 3
7 LC4 15 Potassium bichromate 95 30 6.5 B curve among Fig. 4
8 LC4 15 Boiling water 100 30 6.5 C curve among Fig. 4
9 LY12 15 Potassium bichromate 95 30 6.5 B curve among Fig. 5
10 LY12 15 Boiling water 100 30 6.5 C curve among Fig. 5
11 ZL201 15 Potassium bichromate 95 30 6.5 B curve among Fig. 6
12 ZL201 15 Boiling water 100 30 6.5 C curve among Fig. 6
13 ZL201 15 Potassium bichromate 95 30 6.5 B curve among Fig. 8
14 ZL201 15 Boiling water 100 30 6.5 C curve among Fig. 8
15 ZL201 15 Potassium bichromate 95 30 6.5 B curve among Fig. 9
16 ZL201 15 Boiling water 100 30 6.5 C curve among Fig. 9

Claims (4)

1. anodic rare-earth oxide membrane closing method of aluminium alloy; be through after the anodic oxidation treatment with aluminium alloy; in the confining liquid of pH value 5.5~6.5, carry out sealing treatment; make aluminium alloy anode oxide film form the close and protect film; it is characterized in that: under 90~100 ℃ condition; supersaturated aqueous solution with carbonated rare earth salt is made confining liquid, realizes the sealing of aluminium alloy anode oxide film.
2. method according to claim 1 is characterized in that: carbonated rare earth salt is La 2(CO 3) 3, Nd 2(CO 3) 3, Ce 2(CO 3) 3Or Pr 2(CO 3) 3In a kind of.
3. method according to claim 1 is characterized in that: carbonated rare earth salt is La 2(CO 3) 3, Nd 2(CO 3) 3, Ce 2(CO 3) 3Or Pr 2(CO 3) 3In any two kinds of composite carbon acid rare earth salt.
4. method according to claim 1 is characterized in that: aluminium alloy anode oxide film is forging aluminium alloy oxide film, rust-preventing aluminum alloy oxide film, cast aluminium alloy oxide film or superhard aluminum alloy oxide film.
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LY12铝合金阳极氧化稀土封孔工艺及性能的研究. 于兴文,严川伟,曹楚南.电镀与涂饰,第20卷第5期. 2001 *
铝及铝合金阳极氧化膜德封闭技术. 周育红,韩喜江,周德瑞,孙丽欣.哈尔滨工业大学学报,第35卷第11期. 2003 *

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