CN102286738A - Preparation method and film forming liquid for gray aluminum alloy trivalent chromium composite conversion film - Google Patents
Preparation method and film forming liquid for gray aluminum alloy trivalent chromium composite conversion film Download PDFInfo
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Abstract
The invention discloses a preparation method and film forming liquid for a gray aluminum alloy trivalent chromium composite conversion film. Inorganic corrosion inhibitors of bivalent cobalt salts and organic corrosion inhibitors of alkylol amines are added into the film forming liquid, the film forming liquid is used for treating aluminum or aluminum alloy workpieces, and the gray trivalent chromium conversion film can be formed on the surface of the aluminum alloy. Compared with the trivalent chromium conversion film with the single film layer, the trivalent chromium conversion film prepared by adopting the method can meet the requirement of customers on the gray color, in addition, the anti-corrosion performance of the aluminum alloy is improved, and the anti-corrosion effect of hexavalent chromium chemical conversion films can be reached.
Description
Technical field
The present invention relates to aluminum alloy surface and handle the preparation method and the film forming liquid thereof of the compound conversion film of especially a kind of black aluminum alloy trivalent chromium.
Background technology
For improving the Corrosion Protection of aluminium and other its metals such as zinc, iron and steel, traditional method is to adopt the sexavalent chrome conversion film.Yet sexavalent chrome is poisonous, and in electrical equipment and electronic industry, the RoHS of European Union rules (Restriction of Hazardous Substances, " about being limited in the instruction of using some objectionable constituent in the electronic and electrical equipment ") ban use of hexavalent chromium compound.For satisfying the demand of environmentally friendly technology, people have developed various non-hexavalent chromium conversion films.Nearest research relates to novel conversion films such as titanium, tungsten, tin, zinc and rare-earth salts, because they do not have color, and the production poor operability, actual application value is little.The trivalent chromium conversion film meets the RoHS rules, has color again, produce workable, so at present both at home and abroad many to the technical study of surface of galvanized steel trivalent chromium conversion film., different ground performance differences, the technology of surface of galvanized steel trivalent chromium conversion film can not be used for the aluminium alloy processing.The report of at present relevant trivalent chromium aluminium alloy conversion film, Chinese patent " normal temperature fast filming fluid for aluminium alloy surface and using method thereof " (200710017506.3 applying date of application number 2007-03-15) as Xi'an University of Architecture and Technology, and the early stage Chinese patent " preparation method of aluminum or aluminum alloy trivalent chromium chemical conversion film " (200710034656.5 applying date of application number 2007-03-30) of contriver, its conversion film color and luster only is green, do not satisfy the requirement of client to other tone, composition is also single, and Corrosion Protection also has much room for improvement.
Summary of the invention
The technical problem to be solved in the present invention provides the preparation method and the film forming liquid thereof of the compound conversion film of a kind of black aluminum alloy trivalent chromium, with improve present trivalent chromium conversion film color, composition is single and Corrosion Protection.
For solving the problems of the technologies described above the present invention by the following technical solutions: the film forming liquid of the compound conversion film of a kind of black aluminum alloy trivalent chromium, this film forming liquid contains:
Chromic salt is a chromium sulphate, and manganous salt is a manganous sulfate, and ethanolamines is thanomin, diethanolamine or trolamine.The pH value of this film forming liquid is 1.8～4.0, and temperature is 10～60 ℃.
Use the preparation method of the compound conversion film of aluminum alloy trivalent chromium of above-mentioned film forming liquid, this method may further comprise the steps:
＜1〉oil removing: the grease of aluminum or aluminum alloy workpiece surface is removed, and cleaned up with deionized water;
＜2〉activation: with step＜1〉aluminum or aluminum alloy workpiece after handling is that 6～40g/L, temperature are to activate 1～2 minute in 10～38 ℃ the aqueous sodium hydroxide solution in concentration, and cleans up with deionized water;
＜3〉chromaking: with step＜2〉aluminum or aluminum alloy workpiece after handling chromaking 5～12 minutes in film forming liquid, and clean up with deionized water, be drying to obtain gray trivalent chromium chemical conversion film again.
Drying temperature is 60～80 ℃.
The present invention has added inorganic inhibitor divalent cobalt and organic inhibitor ethanolamines in aluminum alloy trivalent chromium conversion film film forming liquid, use this film forming liquid to handle the aluminum or aluminum alloy workpiece, can form the compound conversion film of trivalent chromium in aluminum alloy surface.Compare with the trivalent chromium conversion film of single rete, adopt the present invention to improve aluminium alloy color and luster and Corrosion Protection, can reach the anticorrosion ability (3.5% NaCl saline soak more than 10 days not cast alumin(i)um rust) of hexavalent chromium chemistry conversion film, and working concentration is low, cost is low, conversion film is a grey, is convenient to production control.In addition, the present invention does not use six chromium valencys, and technological process and product be compliance with environmental protection requirements all.
Description of drawings
Fig. 1 is preparation method's process flow sheet of the compound conversion film of aluminum alloy trivalent chromium of the present invention.
Embodiment
Fig. 1 has shown preparation method's technical process of the compound conversion film of aluminum alloy trivalent chromium of the present invention, wherein sets up step institute waters such as removing oil bath, activating bath, chromaking bath and cleaning and is deionized water.
Embodiment 12024 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 10KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in 7～8 scopes, mixes evenly.
B. build activating bath: before building bath, please container is thoroughly cleaned up,, clean with 10% sulphuric acid soln earlier for new container or new production line, and then water cleans up, the sodium hydroxide that adds required 3KG also is diluted to 450L with deionized water again with deionized water dissolving again, mixes evenly.Temperature remains on 30 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 14KG Cr
2(SO
4)
3And phosphatase 24 KG, use deionized water dissolving, add 1000g rose vitriol and 400g thanomin, add deionized water again to 450L, mix even must film forming liquid, with the sulphur acid for adjusting pH value to 1.8 of 20% sodium hydroxide or 15%, temperature adjustment to 10 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 10 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 60 ℃ down drying promptly got gray trivalent chromium chemical conversion film in 30 minutes.
Embodiment 23003 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 8KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: before building bath, please container is thoroughly cleaned up,, clean with 10% sulphuric acid soln earlier for new container or new production line, and then water cleans up, the sodium hydroxide that adds required 6KG also is diluted to 450L with deionized water again with deionized water dissolving again, mixes evenly.Temperature remains on 20 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 16KG Cr
2(SO
4)
3And phosphoric acid 6KG, use deionized water dissolving, add 1500g rose vitriol and 300g diethanolamine, add deionized water again to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 4.0 of 20% sodium hydroxide or 15%, be warming up to 20 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 1.5 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 11 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ drying 30 minutes is promptly down.
Embodiment 34032 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 9KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 25KG, also be diluted to 450L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 15 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 20KG Cr
2(SO
4)
3And phosphoric acid 8KG, use deionized water dissolving, add 2000g rose vitriol and 200g diethanolamine, add deionized water again to 450L, mix even must film forming liquid, with the sulphur acid for adjusting pH value to 2.8 of 20% sodium hydroxide or 15%, spend temperature adjustment to 15 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 9 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 60 ℃ drying 30 minutes is promptly down.
Embodiment 45052 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 8KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 12KG, also be diluted to 450L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 15 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 30KG Cr
2(SO
4)
3And phosphatase 11 0KG, use deionized water dissolving, add 4000g rose vitriol and 60g trolamine, add deionized water again to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.0 of 20% sodium hydroxide or 15%, be warming up to 60 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 1 minute in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 10 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 60 ℃ down drying promptly got gray trivalent chromium chemical conversion film in 30 minutes.Embodiment 56061 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 12KGRidoline212 of Henkel then, is diluted to 500L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 12KG, also be diluted to 450L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 10 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 48KG Cr
2(SO
4)
3And phosphatase 11 2KG, use deionized water dissolving, add 1800g rose vitriol and 200g diethanolamine, add deionized water again to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 3.8 of 20% sodium hydroxide or 15%, be warming up to 36 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 1 minute in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 7 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ drying 30 minutes is promptly down.
Embodiment 66063 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 10KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 12KG, also be diluted to 450L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 25 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 20KG Cr
2(SO
4)
3And phosphatase 11 0KG, use deionized water dissolving, add 2500g rose vitriol and 100g trolamine, add deionized water again to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 4.0 of 20% sodium hydroxide or 15%, be warming up to 40 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 9 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 70 ℃ drying 30 minutes is promptly down.
Embodiment 77075 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 100L adds the degreaser 10KGRidoline212 of Henkel then, is diluted to 450L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 12KG, also be diluted to 450L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 18 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 18KG Cr
2(SO
4)
3And phosphatase 11 2KG, use deionized water dissolving, add 4000g rose vitriol and 150g trolamine, add deionized water again to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 3.2 of 20% sodium hydroxide or 15%, be warming up to 50 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜l〉workpiece after handling activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 12 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 60 ℃ drying 30 minutes is promptly down.
Embodiment 8 aluminum alloy die casting trivalent chromium chromaking
A. build 300L and remove oil bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L earlier, water cleans 2 times again, each clear water 60L, the oil-bound distemper Ridoline2126KG that removes that adds Henkel then releases 300L, is diluted to 300L with deionized water again, PH is controlled in the 7-8 scope, mixes evenly.
B. build the 300L activating bath: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 8KG, also be diluted to 300L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on 28 ℃.
C. building the 300L chromaking bathes: please container is thoroughly cleaned up before building bath, for new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 15KG KCr (SO
4)
2And phosphoric acid 5KG, add 1000g rose vitriol and 60g trolamine, use deionized water dissolving, add deionized water again to 300L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.5 of 20% sodium hydroxide or 15%, be warming up to 45 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, removed the workpiece surface grease in 8 minutes through removing oil bath, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after handling activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after handling chromaking 8 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, again 60 ℃ down drying promptly got gray trivalent chromium chemical conversion film in 30 minutes.
Reference examples 1 aluminum alloy trivalent chromium chromaking is implemented by patent 200710034656.5
6063 aluminum alloy trivalent chromium chromaking
2.1) build 400L and remove oil bath: please container is thoroughly cleaned up before bathing building, for new container or new production line, clean with 10% sulphuric acid soln 40L earlier, water cleans 2 times again, each clear water 80L, the oil-bound distemper Ridoline2128KG that removes that adds Henkel then releases 400L, is diluted to 400L with deionized water again, and PH is controlled in the 7-8 scope.
2.2) build activating bath:: please container is thoroughly cleaned up before bathing building, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 20KG, also be diluted to 400L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on normal 20-25 degree centigrade.
2.3) build the bath of 400L chromaking: before building bath, please container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 15KG Cr for new container or new production line
2(SO
4)
3And phosphoric acid 6KG, use deionized water dissolving, add deionized water again to 400L, mix evenly, measure its pH value, if pH value not in the 1.8-4.0 scope, then will be adjusted in the scope with the sulfuric acid of 20% sodium hydroxide or 15%.Be warming up to 40-50 degree centigrade then.
2.4) treat again workpiece to be put into the stainless steel basket after above-mentioned work is ready to or hung on the hanger, through oil removing 6 minutes, cleaned 2 minutes, activate 2 minutes, cleaned chromaking 6 minutes 2 minutes, cleaned at last 2 minutes, 100 degrees centigrade were descended dry 30 minutes, and promptly obtained absinthe-green trivalent chromium chemical conversion film.
Reference examples 2 conventional aluminium alloy sexavalent chrome chromaking
6063 aluminium alloy sexavalent chrome chromaking
2.1) build 400L and remove oil bath: please container is thoroughly cleaned up before bathing building, for new container or new production line, clean with 10% sulphuric acid soln 40L earlier, water cleans 2 times again, each clear water 80L, the oil-bound distemper Ridoline2128KG that removes that adds Henkel then releases 400L, is diluted to 400L with deionized water again, and PH is controlled in the 7-8 scope.
2.2) build the 400L activating bath:: please container is thoroughly cleaned up before bathing building, for new container or new production line, clean with 10% sulphuric acid soln earlier, and then water cleans up, the sodium hydroxide that adds required 20KG, also be diluted to 400L with deionized water again with deionized water dissolving again, mix evenly.Temperature remains on normal 20～30 degrees centigrade.
2.3) build the bath of 400L chromaking: before building bath, please container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 20KG K for new container or new production line
2Cr
2O
7And phosphoric acid 8KG, use deionized water dissolving, add deionized water again to 400L, mix evenly, measure its pH value, if pH value not in the 1.8-4.0 scope, then will be adjusted in the scope with the sulfuric acid of 20% sodium hydroxide or 15%.Be warming up to 50-60 degree centigrade then.
2.4) treat again workpiece to be put into the stainless steel basket after above-mentioned work is ready to or hung on the hanger, through oil removing 6 minutes, cleaned 2 minutes, activate 2 minutes, cleaned chromaking 6 minutes 2 minutes, cleaned at last 2 minutes, 100 degrees centigrade were descended dry 30 minutes, and promptly obtained flavous hexavalent chromium chemistry conversion film.
Carry out quality examination to above-mentioned through embodiment 1 to 8 and reference examples 1 to 2 processing gained Al alloy parts, the result is as shown in table 1 for its Corrosion Protection technical indicator.
Table 1: Corrosion Protection technical indicator comparison sheet
Conclusion: the tone of this compound conversion film is a grey, and antiseptic property surpasses the aluminum alloy trivalent chromium conversion film of routine in the past, and is suitable with the sexavalent chrome conversion film.
Claims (5)
1. the film forming liquid of the compound conversion film of grey aluminum alloy trivalent chromium is characterized in that this film forming liquid contains:
2. the film forming liquid of the compound conversion film of aluminum alloy trivalent chromium according to claim 1 is characterized in that: described chromic salt is a chromium sulphate, and described divalent cobalt is a rose vitriol, and described ethanolamines is thanomin, diethanolamine or trolamine.
3. the film forming liquid of the compound conversion film of grey aluminum alloy trivalent chromium according to claim 1 and 2, the pH value that it is characterized in that this film forming liquid is 1.8～4.0, temperature is 10～60 ℃.
4. use the preparation method of the compound conversion film of aluminum alloy trivalent chromium of the described film forming liquid of claim 3, it is characterized in that this method may further comprise the steps:
＜1〉oil removing: the grease of aluminum or aluminum alloy workpiece surface is removed, and cleaned up with deionized water;
＜2〉activation: with step＜1〉aluminum or aluminum alloy workpiece after handling is that 6～40g/L, temperature are to activate 1～2 minute in 10～38 ℃ the aqueous sodium hydroxide solution in concentration, and cleans up with deionized water;
＜3〉chromaking: with step＜2〉aluminum or aluminum alloy workpiece after handling chromaking 5～12 minutes in film forming liquid, and clean up with deionized water, be drying to obtain again.
5. use the preparation method of the compound conversion film of aluminum alloy trivalent chromium of the described film forming liquid of claim 4, it is characterized in that: described drying temperature is 60-80 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560456A (en) * | 2012-03-16 | 2012-07-11 | 广西民族大学 | Preparation method of aluminium alloy trivalent chromium and trivalent cerium composite conversion film, and film formation liquid of composite conversion film |
| CN114016692A (en) * | 2021-11-09 | 2022-02-08 | 晋江市新思维环保科技有限公司 | Honeycomb aluminum plate based on hot press molding and preparation process thereof |
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| CN101275225A (en) * | 2007-03-30 | 2008-10-01 | 中南大学 | Preparation for aluminum or aluminum alloy trivalent chromium chemical conversion film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101275225A (en) * | 2007-03-30 | 2008-10-01 | 中南大学 | Preparation for aluminum or aluminum alloy trivalent chromium chemical conversion film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102560456A (en) * | 2012-03-16 | 2012-07-11 | 广西民族大学 | Preparation method of aluminium alloy trivalent chromium and trivalent cerium composite conversion film, and film formation liquid of composite conversion film |
| CN114016692A (en) * | 2021-11-09 | 2022-02-08 | 晋江市新思维环保科技有限公司 | Honeycomb aluminum plate based on hot press molding and preparation process thereof |
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Application publication date: 20111221 |