CN103103518A - Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof - Google Patents
Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof Download PDFInfo
- Publication number
- CN103103518A CN103103518A CN2013100758931A CN201310075893A CN103103518A CN 103103518 A CN103103518 A CN 103103518A CN 2013100758931 A CN2013100758931 A CN 2013100758931A CN 201310075893 A CN201310075893 A CN 201310075893A CN 103103518 A CN103103518 A CN 103103518A
- Authority
- CN
- China
- Prior art keywords
- forming liquid
- film forming
- trivalent chromium
- minutes
- aluminum alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a preparation method of an aluminum alloy yellowish trivalent chromium conversion film and a film forming liquid thereof. Chromium sulfate, 1-hydroxyethylidene-1,1-diphosphonic acid and sulfanilamide are added into the form forming liquid, and the yellowish trivalent chromium conversion film can be formed on the surface of the aluminum alloy by treating an aluminum or aluminum alloy workpiece through the film forming liquid. Compared with a single trivalent chromium conversion film, the preparation method of the aluminum alloy yellowish trivalent chromium conversion film and the film forming liquid thereof can meet the demand on yellowish tone, the corrosion resistant property of the aluminum alloy can be improved, and the corrosion resistance effect of the chemical hexavalent chromium conversion film can be achieved.
Description
Technical field
The present invention relates to aluminum alloy surface and process, preparation method and the film forming liquid thereof of the faint yellow trivalent chromium conversion film of especially a kind of aluminium alloy.
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, 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 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 the 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 again color, 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 technique of surface of galvanized steel trivalent chromium conversion film can not be used for aluminium alloy and process.the report of at present relevant trivalent chromium Conversion Coatings on Aluminum Alloys, 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 contriver's Chinese patent of 2011 " preparation method of the compound conversion film of aluminum alloy trivalent chromium and film forming liquid thereof " (application number: 201110068950.4, date of application: 2011-03-22), its conversion film color and luster is only green, can not meet the client to the requirement of other tone, composition is also single, Corrosion Protection also has much room for improvement.
Summary of the invention
The technical problem to be solved in the present invention is to provide preparation method and the film forming liquid thereof of the faint yellow trivalent chromium conversion film of a kind of aluminium alloy, 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 preparation method of the faint yellow trivalent chromium conversion film of a kind of aluminium alloy and film forming liquid thereof, this film forming liquid contains:
Chromium sulphate is in trivalent chromic ion 8～40g/L
(1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 5～28g/L
Sulfanilic amide 0.1～10g/L is formulated.
The pH value of this film forming liquid is 1.5～4.5, and temperature is 5～45 ℃.
Use the preparation method of the faint yellow look trivalent chromium conversion of the aluminium alloy film of above-mentioned film forming liquid, the method comprises the following 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 processing is that 2～40g/L, temperature are to activate 1～2 minute in the aqueous sodium hydroxide solution of 10～40 ℃ in concentration, and cleans up with deionized water;
＜3〉chromaking: with step＜2〉aluminum or aluminum alloy workpiece after processing chromaking 5～15 minutes in film forming liquid, and clean up with deionized water, then be drying to obtain flaxen trivalent chromium conversion film.
Drying temperature is 60～80 ℃.
The present invention has added chromic salts and organism (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid, sulfanilic amide in aluminum alloy trivalent chromium conversion film film forming liquid, use this film forming liquid to process the aluminum or aluminum alloy workpiece, can form faint yellow trivalent chromium conversion film 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 faint yellow, is convenient to production control.In addition, the present invention does not use six chromium valencys, and technological process and product all meet environmental requirement.
Description of drawings
Fig. 1 is that aluminium alloy of the present invention adopts trivalent chromium and (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid and sulfanilic amide to prepare the preparation method's of faint yellow trivalent chromium conversion film experiment or production technological process.
Embodiment
Fig. 1 has shown preparation method's technical process of the faint yellow trivalent chromium conversion film of aluminium alloy of the present invention, wherein sets up step water used such as removing oil bath, activating bath, chromaking bath and cleaning and is deionized water.
Embodiment 1 2024 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 10KGRidoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in 7～8 scopes, mixes evenly.
B. build activating bath: please container is thoroughly cleaned up, for new container or new production line, first clean with 10% sulphuric acid soln before building bath, and then water cleans up, the sodium hydroxide that adds required 3kg, more also be diluted to 450L with deionized water again with deionized water dissolving, mix evenly.Temperature remains on 10 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 67KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 2.5KG, use deionized water dissolving, then add 45 gram sulfanilic amide, add again deionized water to 450L, mix even film forming liquid, with the sulphur acid for adjusting pH value to 1.5 of 20% sodium hydroxide or 15%, then temperature adjustment to 5 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 15 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then under 60 ℃, drying namely got flaxen trivalent chromium conversion film in 30 minutes.
Embodiment 2 3003 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 8KG Ridoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build activating bath: please container is thoroughly cleaned up, for new container or new production line, first clean with 10% sulphuric acid soln before building bath, and then water cleans up, the sodium hydroxide that adds required 6KG, more also be diluted to 450L with deionized water again with deionized water dissolving, mix evenly.Temperature remains on 40 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 14KG Cr
2(S0
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 12.5KG, use deionized water dissolving, then add the 4.5KG sulfanilic amide, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 4.5 of 20% sodium hydroxide or 15%, then be warming up to 45 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing 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 processing chromaking 5 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then drying 30 minutes and get final product under 80 ℃.
Embodiment 3 4032 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 9KG Ridoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 20 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 20KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 5KG, use deionized water dissolving, then add 100 gram sulfanilic amide, add again deionized water to 450L, mix even film forming liquid, with the sulphur acid for adjusting pH value to 2.0 of 20% sodium hydroxide or 15%, then spend temperature adjustment to 18 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 6 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then drying 30 minutes and get final product under 65 ℃.
Embodiment 4 5052 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 8KGRidoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 30 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 28KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 6KG, use deionized water dissolving, then add 500 gram sulfanilic amide, add again deionized water 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%, then be warming up to 40 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 1 minute in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 8 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then under 70 ℃, drying namely got flaxen trivalent chromium chemical conversion film in 30 minutes.
Embodiment 5 6061 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 12KGRidoline212 of Henkel, then is diluted to 500L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 38 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 40KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 8KG, use deionized water dissolving, then add the 1KG sulfanilic amide, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 3.5 of 20% sodium hydroxide or 15%, then be warming up to 35 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 1 minute in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 12 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then drying 30 minutes and get final product under 60 ℃.
Embodiment 6 6063 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 10KGRidoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 50KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 8KG, use deionized water dissolving, then add the 2KG sulfanilic amide, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.8 of 20% sodium hydroxide or 15%, then be warming up to 40 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 14 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then drying 30 minutes and get final product under 68 ℃.
Embodiment 7 7075 aluminum alloy trivalent chromium chromaking
A. build 450L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 100L adds the degreaser 10KGRidoline212 of Henkel, then is diluted to 450L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.
B. build the 450L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 38 ℃.
C. building the 450L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 60KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 10KG, use deionized water dissolving, then add the 4KG sulfanilic amide, add again deionized water to 450L, 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%, then be warming up to 45 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 12 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then drying 30 minutes and get final product under 65 ℃.
Embodiment 8 aluminum alloy die casting trivalent chromium chromaking
A. build 300L and remove oil bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln 50L, water cleans 2 times again, then each clear water 60L adds the degreasing powder Ridoline2126KG of Henkel to release 300L, then is diluted to 300L with deionized water, pH is controlled in the 7-8 scope, mixes evenly.B. build the 300L activating bath: please container is thoroughly cleaned up before building bath, for new container or new production line, first clean with 10% sulphuric acid soln, 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 45 ℃.
C. building the 300L chromaking bathes: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 20KG Cr
2(SO
4)
3And (1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 5KG, use deionized water dissolving, then add the 1.8KG sulfanilic amide, use deionized water dissolving, then add deionized water 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%, then be warming up to 40 ℃.
D. prepare faint yellow trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece is put into the stainless steel basket or is hung on hanger, through removing the workpiece surface grease except oil bath 8 minutes, and with washed with de-ionized water 2 minutes to totally;
＜2〉activation: with step＜1〉workpiece after processing activate 2 minutes in activating bath, and with washed with de-ionized water 2 minutes extremely totally;
＜3〉chromaking: with step＜2〉workpiece after processing chromaking 8 minutes in the film forming liquid that chromaking is bathed, and with washed with de-ionized water 2 minutes to clean, then under 78 ℃, drying namely got flaxen trivalent chromium 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 except oil bath: please container is thoroughly cleaned up before bathing building, for new container or new production line, first clean with 10% sulphuric acid soln 40L, water cleans 2 times again, each clear water 80L, then add the degreasing powder Ridoline2128KG of Henkel to release 400L, then be diluted to 400L with deionized water, 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, first clean with 10% sulphuric acid soln, 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 25 degrees centigrade.
2.3) build the 400L chromaking and bathe: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 15KG Cr
2(SO
4)
3And phosphoric acid 6KG, add 290g manganous sulfate and 80g trolamine, use deionized water dissolving, add again deionized water to 400L, mix evenly, measure its pH value, if the pH value not in the 1.8-4.0 scope, will be adjusted in scope with the sulfuric acid of 20% sodium hydroxide or 15%.Then be warming up to 40-50 degree centigrade.
2.4) again workpiece is put into the stainless steel basket or hang on hanger after above-mentioned Job readiness is good, through oil removing 6 minutes, cleaned 2 minutes, activate 2 minutes, cleaned chromaking 6 minutes 2 minutes, cleaned at last 2 minutes, and under 80 degrees centigrade dry 30 minutes, namely obtained green trivalent chromium chemical conversion film.
The conventional aluminium alloy sexavalent chrome of reference examples 2 chromaking
6063 aluminium alloy sexavalent chrome chromaking
2.1) build 400L except oil bath: please container is thoroughly cleaned up before bathing building, for new container or new production line, first clean with 10% sulphuric acid soln 40L, water cleans 2 times again, each clear water 80L, then add the degreasing powder Ridoline2128KG of Henkel to release 400L, then be diluted to 400L with deionized water, 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, first clean with 10% sulphuric acid soln, 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 30 degrees centigrade.
2.3) build the 400L chromaking and bathe: please container is thoroughly cleaned up before bathing building, for new container or new production line, first with 15% sulphuric acid soln cleaning, and then water cleans up, and adds 20KG K
2Cr
2O
7And phosphoric acid 8KG, use deionized water dissolving, then add deionized water to 400L, mix evenly, measure its pH value, if the pH value not in the 1.8-4.0 scope, will be adjusted in scope with the sulfuric acid of 20% sodium hydroxide or 15%.Then be warming up to 50-60 degree centigrade.
2.4) again workpiece is put into the stainless steel basket or hang on hanger after above-mentioned Job readiness is good, through oil removing 6 minutes, cleaned 2 minutes, activate 2 minutes, cleaned 2 minutes, chromaking 6 minutes was cleaned 2 minutes at last, under 100 degrees centigrade, drying is 30 minutes, namely obtains 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, its Corrosion Protection technical indicator result is as shown in table 1.
Table 1: Corrosion Protection technical indicator comparison sheet
Conclusion: the tone of this conversion film is faint yellow, 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 (4)
1. the film forming liquid of the faint yellow trivalent chromium conversion film of aluminium alloy is characterized in that this film forming liquid contains:
Chromium sulphate is in trivalent chromic ion 8～40g/L
(1-hydroxy ethylene) di 2 ethylhexyl phosphonic acid 5～28g/L
Sulfanilic amide 0.1～10g/L is formulated.
2. the film forming liquid of the faint yellow trivalent chromium conversion film of aluminium alloy according to claim 1, the film forming pH value that it is characterized in that this film forming liquid is 1.5～4.5, temperature is 5～45 ℃.
3. right to use requires 1 and 2 described film forming liquid, and the faint yellow trivalent chromium conversion membrane preparation method of this aluminium alloy is characterised in that the method comprises the following 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 processing is that 2～40g/L, temperature are to activate 1～2 minute in the aqueous sodium hydroxide solution of 10～40 ℃ in concentration, and cleans up with deionized water;
＜3〉chromaking: with step＜2〉aluminum or aluminum alloy workpiece after processing chromaking 5～15 minutes in film forming liquid, and clean up with deionized water, then be drying to obtain.
4. right to use requires the preparation method of the faint yellow trivalent chromium conversion film of aluminium alloy of 3 described film forming liquid, and it is characterized in that: described drying temperature is 60-80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100758931A CN103103518A (en) | 2013-03-11 | 2013-03-11 | Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100758931A CN103103518A (en) | 2013-03-11 | 2013-03-11 | Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103103518A true CN103103518A (en) | 2013-05-15 |
Family
ID=48311700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100758931A Pending CN103103518A (en) | 2013-03-11 | 2013-03-11 | Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103103518A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060251A (en) * | 2013-09-05 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Chromium ion passivation solution and preparation method thereof and hot-dip plated metal material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040000358A1 (en) * | 2002-05-13 | 2004-01-01 | Promila Bhatia | Corrosion resistant trivalent chromium phosphated chemical conversion coatings |
| CN101275225A (en) * | 2007-03-30 | 2008-10-01 | 中南大学 | Preparation for aluminum or aluminum alloy trivalent chromium chemical conversion film |
| CN102301033A (en) * | 2009-01-30 | 2011-12-28 | 油研工业股份有限公司 | Composition for chemical conversion coating, and member equipped with chemical conversion coating film comprising the composition |
-
2013
- 2013-03-11 CN CN2013100758931A patent/CN103103518A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040000358A1 (en) * | 2002-05-13 | 2004-01-01 | Promila Bhatia | Corrosion resistant trivalent chromium phosphated chemical conversion coatings |
| CN101275225A (en) * | 2007-03-30 | 2008-10-01 | 中南大学 | Preparation for aluminum or aluminum alloy trivalent chromium chemical conversion film |
| CN102301033A (en) * | 2009-01-30 | 2011-12-28 | 油研工业股份有限公司 | Composition for chemical conversion coating, and member equipped with chemical conversion coating film comprising the composition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060251A (en) * | 2013-09-05 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Chromium ion passivation solution and preparation method thereof and hot-dip plated metal material |
| CN104060251B (en) * | 2013-09-05 | 2016-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Chromium ion passivating solution and preparation method thereof and hot-dip metal plated material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103866311B (en) | One is prepared chemical conversion film method based on molybdate in aluminum alloy surface | |
| KR20060126752A (en) | Chrome-free passivating solution | |
| EP1978131B2 (en) | Means for manufacturing corrosion protection coats on metal surfaces | |
| CN102174694B (en) | Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof | |
| CN105112904A (en) | Sedimentation accelerating agent and application used for coating mechanically plated with copper and copper alloy | |
| CN105200482A (en) | Nickel-free hole sealing agent for improving abrasion resistance of aluminum alloy anode oxide film and preparation method of nickel-free hole sealing agent | |
| CN100567569C (en) | The preparation method of aluminum or aluminum alloy trivalent chromium chemical conversion film | |
| CN104278281B (en) | Pickling solution containing compound passivating agent and preparation method thereof | |
| CN102383120B (en) | Preparation method and film formation liquid for aluminium-alloy organic sealing film | |
| CN104451634A (en) | Aluminum and aluminum alloy passivation solution, preparation method and using method thereof | |
| CN102002704B (en) | Trivalent chromium natural colour passivation solution for processing aluminium alloy | |
| CN103103518A (en) | Preparation method of aluminum alloy yellowish trivalent chromium conversion film and film forming liquid thereof | |
| CN108359969A (en) | A kind of preparation method of aluminum alloy surface environmental protection self-cure type titanium/zirconium/molybdenum conversion film | |
| CN102534598B (en) | Preparation method and film-forming liquid for aluminum alloy high-performance trivalent chromium hybrid conversion film | |
| CN102618861B (en) | Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method | |
| CN103160824B (en) | A kind of preparation method of aluminium alloy organic amine phenol compound closure film and film forming liquid thereof | |
| CN102912336A (en) | Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof | |
| CN102286738A (en) | Preparation method and film forming liquid for gray aluminum alloy trivalent chromium composite conversion film | |
| CN102864445B (en) | Preparation method of aluminum alloy yellow-green trivalent chromium conversion coating and filming liquid thereof | |
| CN104611689A (en) | Chemical oxidation liquid for magnesium alloy | |
| JP5663684B2 (en) | Chromium-free chemical conversion treatment solution, chemical conversion treatment method, and chemical conversion treatment article | |
| CN102304707A (en) | Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof | |
| CN103866309A (en) | Trivalent chromium blue-white passivation solution for treating zinc die-cast alloys | |
| CN103060877A (en) | Electrolyte for aluminum alloy micro-plasma electrolytic oxidation and treating process thereof | |
| CN102560456A (en) | Preparation method of aluminium alloy trivalent chromium and trivalent cerium composite conversion film, and film formation liquid of composite conversion film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130515 |