CN102174694B - Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof - Google Patents
Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof Download PDFInfo
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Abstract
The invention discloses a method for preparing an aluminium alloy/trivalent chromium composite conversion film and a film-forming liquid thereof. An inorganic corrosion inhibitor divalent manganese salt and an organic corrosion inhibitor ethanolamine are added into the coating-forming liquid, and a trivalent chromium composite conversion film can be formed on the surface of an aluminium alloy when the film-forming liquid is used to process an aluminium or aluminium alloy workpiece. Compared with the trivalent chromium conversion film with a single film layer, the aluminium alloy/trivalent chromium composite conversion film prepared by the method can improve the corrosion resistance of the aluminium alloy, and achieve the same corrosion resistance effect with that of a hexavalent chromium chemical conversion film.
Description
Technical field
The present invention relates to aluminum alloy surface and handle the preparation method of the compound conversion film of especially a kind of aluminum alloy trivalent chromium and film forming liquid thereof.
Background technology
For improving the Corrosion Protection of aluminium and other 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 performances are different, and the technology of surface of galvanized steel trivalent chromium conversion film can not be used for duraluminum and handle.The report of at present relevant trivalent chromium duraluminum conversion film; Chinese patent " normal temperature fast filming fluid for aluminium alloy surface and method of use thereof " (on 03 15th, 2,007 200710017506.3 applyings date of application number) like 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 " (on 03 30th, 2,007 200710034656.5 applyings date of application number) of contriver; Its conversion film composition is single, and Corrosion Protection remains further to be improved.
Summary of the invention
The technical problem that the present invention will solve provides the preparation method and the film forming liquid thereof of the compound conversion film of a kind of aluminum alloy trivalent chromium, to improve the Corrosion Protection of present single composition trivalent chromium conversion film.
Adopt following technical scheme for solving the problems of the technologies described above the present invention: the film forming liquid of the compound conversion film of aluminum alloy trivalent chromium, this film forming liquid contains:
Chromic salt is in trivalent chromic ion 5～28g/L
Phosphoric acid 5～28g/L
Manganous salt is in divalent manganesetion 0.2～1.6g/L
Ethanolamines is in thanomin 0.1～0.6g/L.
Chromic salt is chromium sulphate or potassium chromium sulfate, and manganous salt is a manganous sulfate, and ethanolamines is thanomin, diethylolamine or trolamine.
The pH value of this film forming liquid is 1.5～4.0, and temperature is 10～50 ℃.
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: the aluminum or aluminum alloy workpiece after step < 1>handled is that 5～60g/L, temperature are activation 1～2 minute in 5～30 ℃ the aqueous sodium hydroxide solution in concentration, and cleans up with deionized water;
< 3>chromaking: the chromaking 6～12 minutes in film forming liquid of the aluminum or aluminum alloy workpiece after step < 2>handled, and clean up with deionized water, be drying to obtain again.
Drying temperature is 80 ℃.
The present invention has added inorganic inhibitor manganous salt and organic inhibitor ethanolamines in aluminum alloy trivalent chromium conversion film film forming liquid, use this film forming liquid to handle aluminum or aluminum alloy two 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 the Corrosion Protection of duraluminum; 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, and conversion film has color, 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 preparing method's process flow sheet of the compound conversion film of aluminum alloy trivalent chromium of the present invention.
Embodiment
Fig. 1 has shown preparing 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 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; Water cleans 2 times again; Each clear water 100L adds the degreaser 8KgRidoline212 of Henkel then, is diluted to 500L with deionized water again; PH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 2.5Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 30 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 10Kg Cr for new container or new production line
2(SO
4)
3And phosphatase 24 Kg, use deionized water dissolving, add 275g manganous sulfate and 300g thanomin, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.3 of 15% sodium hydroxide or 10%, be warming up to 10 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 2 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 10 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 23003 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; Water cleans 2 times again; Each clear water 100L adds the degreaser 9KgRidoline212 of Henkel then, is diluted to 500L with deionized water again; PH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 5Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 20 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 16Kg Cr for new container or new production line
2(SO
4)
3And phosphoric acid 6Kg, use deionized water dissolving, add 800g manganous sulfate and 150g diethylolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 4.0 of 15% sodium hydroxide or 10%, be warming up to 20 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 1.5 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 11 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 34032 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; Water cleans 2 times again; Each clear water 100L adds the degreaser 9KgRidoline212 of Henkel then, is diluted to 500L with deionized water again; PH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 25Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 15 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 20Kg Cr for new container or new production line
2(SO
4)
3And phosphoric acid 8Kg, use deionized water dissolving, add 1000g manganous sulfate and 100g diethylolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 1.5 of 15% sodium hydroxide or 10%, be warming up to 10 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 2 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 9 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 45052 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; Water cleans 2 times again; Each clear water 100L adds the degreaser 8KgRidoline212 of Henkel then, is diluted to 500L with deionized water again; PH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 20Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 5 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 32Kg Cr for new container or new production line
2(SO
4)
3And phosphatase 11 4Kg, use deionized water dissolving, add 1200g manganous sulfate and 50g trolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.0 of 15% sodium hydroxide or 10%, be warming up to 50 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 1 minute in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 10 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 56061 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; 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 activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 12Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 10 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 50Kg Cr for new container or new production line
2(SO
4)
3And phosphatase 11 2Kg, use deionized water dissolving, add 1800g manganous sulfate and 200g diethylolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 3.8 of 15% sodium hydroxide or 10%, be warming up to 35 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 1 minute in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 7 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 66063 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; 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 activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 12Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 23 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 12Kg Cr for new container or new production line
2(SO
4)
3And phosphatase 11 0Kg, use deionized water dissolving, add 2100g manganous sulfate and 100g trolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 4.0 of 15% sodium hydroxide or 10%, be warming up to 40 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 2 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 9 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 77075 aluminum alloy trivalent chromium chromaking
A. build 500L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 10% sulphuric acid soln 50L earlier for new container or new production line; 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 activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 12Kg; Also be diluted to 500L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 17 ℃.
C. build the bath of 500L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 18Kg Cr for new container or new production line
2(SO
4)
3And phosphatase 11 2Kg, use deionized water dissolving, add 2000g manganous sulfate and 200g trolamine, add deionized water again to 500L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 3.0 of 15% sodium hydroxide or 10%, be warming up to 40 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 2 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 12 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Embodiment 8 aluminum alloy die casting trivalent chromium chromaking
A. build 300L and remove oil bath: before building bath, earlier container is thoroughly cleaned up,, clean with 20% sulphuric acid soln 50L earlier for new container or new production line; Water cleans 2 times again; Each clear water 60L, the oil-bound distemper Ridoline2128Kg 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 activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% 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 26 ℃.
C. build the bath of 300L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 10Kg KCr (SO for new container or new production line
4)
2And phosphoric acid 6Kg, add 800g manganous sulfate and 80g 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 15% sodium hydroxide or 10%, be warming up to 50 ℃ then.
D. prepare the compound conversion film of trivalent chromium:
< 1>oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung 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: the activation 2 minutes in activating bath of the workpiece after step < 1>handled, and with washed with de-ionized water 2 minutes to totally;
< 3>chromaking: the chromaking 6 minutes in the film forming liquid that chromaking is bathed of the workpiece after step < 2>handled, and with washed with de-ionized water 2 minutes to clean, again 80 ℃ down drying promptly got in 30 minutes.
Reference examples 16063 aluminum alloy trivalent chromium chromaking (pressing Chinese patent 200710034656.5 implements)
A. build 400L and remove oil bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 20% 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.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% sulphuric acid soln earlier, and then water cleans up; The sodium hydroxide that adds required 50Kg; Also be diluted to 400L with deionized water again with deionized water dissolving again, mix evenly, temperature remains on 5-30 degree centigrade.
C. build the bath of 400L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 6Kg Cr for new container or new production line
2(SO
4)
3And phosphoric acid 5Kg, use deionized water dissolving, add deionized water again to 400L, mix evenly, measure its pH value, if the pH value not in the 1.8-4.0 scope, then the sulfuric acid with 15% sodium hydroxide or 10% is adjusted in the scope, is warming up to 50-60 degree centigrade then.
D. treat again workpiece to be put into the stainless steel basket after above-mentioned work is ready to or hang on the hanger,, cleaned 2 minutes through oil removing 6 minutes; Chromaking 6 minutes was cleaned in activation 2 minutes 2 minutes; Cleaned at last 2 minutes, and 100 subcutaneous dry 30 minutes Celsius, promptly obtained absinthe-green trivalent chromium chemical conversion film.
Reference examples 26063 duraluminum sexavalent chrome chromaking
A. build 400L and remove oil bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 20% sulphuric acid soln 40L earlier, water cleans 2 times again; Each clear water 80L; The oil-bound distemper Ridoline212 8Kg 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.
B. build activating bath: before building bath, earlier container is thoroughly cleaned up; For new container or new production line, clean with 15% 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 5-30 degree centigrade.
C. build the bath of 400L chromaking: before building bath, earlier container is thoroughly cleaned up,, clean with 15% sulphuric acid soln earlier, and then water cleans up adding 10Kg K for new container or new production line
2Cr
2O
7And phosphoric acid 5Kg, use deionized water dissolving, add deionized water again to 400L, mix evenly, measure its pH value, if the pH value not in the 1.8-4.0 scope, then the sulfuric acid with 15% sodium hydroxide or 10% is adjusted in the scope, is warming up to 50-60 degree centigrade then.
D. treat again workpiece to be put into the stainless steel basket after above-mentioned work is ready to or hang on the hanger,, cleaned 2 minutes through oil removing 6 minutes; Chromaking 6 minutes was cleaned in activation 2 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 through embodiment 1 to 8 with reference examples 1 to 2 processing gained Al alloy parts to above-mentioned, the result is as shown in table 1 for its Corrosion Protection technical indicator.
Table 1: Corrosion Protection technical indicator comparison sheet
Conclusion: the antiseptic property of the compound conversion film of aluminum alloy trivalent chromium of employing the present invention preparation 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 aluminum alloy trivalent chromium is characterized in that this film forming liquid contains:
Chromic salt is in trivalent chromic ion 5～28g/L
Phosphoric acid 5～28g/L
Manganous salt is in divalent manganesetion 0.2～1.6g/L
Ethanolamines is in thanomin 0.1～0.6g/L.
2. the film forming liquid of the compound conversion film of aluminum alloy trivalent chromium according to claim 1 is characterized in that: said chromic salt is chromium sulphate or potassium chromium sulfate, and said manganous salt is a manganous sulfate, and said ethanolamines is thanomin, diethylolamine or trolamine.
3. the film forming liquid of the compound conversion film of aluminum alloy trivalent chromium according to claim 1 and 2, the pH value that it is characterized in that this film forming liquid is 1.5～4.0, temperature is 10～50 ℃.
4. use the preparation method of the compound conversion film of aluminum alloy trivalent chromium of the said 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: the aluminum or aluminum alloy workpiece after step < 1>handled is that 5～60g/L, temperature are activation 1～2 minute in 5～30 ℃ the aqueous sodium hydroxide solution in concentration, and cleans up with deionized water;
< 3>chromaking: the chromaking 6～12 minutes in film forming liquid of the aluminum or aluminum alloy workpiece after step < 2>handled, 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 said film forming liquid of claim 4, it is characterized in that: said drying temperature is 80 ℃.
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| CN102304707A (en) * | 2011-09-23 | 2012-01-04 | 广西民族大学 | Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof |
| CN102618861B (en) * | 2012-03-16 | 2014-03-26 | 广西民族大学 | Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method |
| CN102912336A (en) * | 2012-10-18 | 2013-02-06 | 广西民族大学 | Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof |
| CN103805984A (en) * | 2012-11-09 | 2014-05-21 | 重庆长安工业(集团)有限责任公司 | Aluminum alloy chemical film forming process |
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| EP1571238A1 (en) * | 2004-03-02 | 2005-09-07 | Nihon Hyomen Kagaku Kabushiki Kaisha | Aluminium elements, processes and compositions for producing aluminium surface free- chromium (VI) chromate coatings |
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| EP1571238A1 (en) * | 2004-03-02 | 2005-09-07 | Nihon Hyomen Kagaku Kabushiki Kaisha | Aluminium elements, processes and compositions for producing aluminium surface free- chromium (VI) chromate coatings |
Non-Patent Citations (1)
| Title |
|---|
| 余会成.6063铝合金三价铬化学转化膜的制备及性能研究.《中南大学博士论文》.2009,第26、39、91、115页. * |
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