CN102912336A - Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof - Google Patents
Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof Download PDFInfo
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- CN102912336A CN102912336A CN2012103981255A CN201210398125A CN102912336A CN 102912336 A CN102912336 A CN 102912336A CN 2012103981255 A CN2012103981255 A CN 2012103981255A CN 201210398125 A CN201210398125 A CN 201210398125A CN 102912336 A CN102912336 A CN 102912336A
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Abstract
The invention discloses a method of preparing an aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof. The method comprises the following steps: adding copper salt and organic vinyl pyridines in the film-forming liquid; and using the film-forming liquid to process aluminum or aluminum alloy workpieces so that a dark green trivalent chromium conversion film can be formed on the surface of the aluminum alloy. Compared with a trivalent chromium conversion film with a single film layer, the application of the aluminum alloy dark green trivalent chromium conversion film can satisfy the requirement on dark green color tone, the anti-corrosion performance of the aluminum alloy is improved, and the anti-corrosion effect of a hexavalent chromium chemical conversion film can be achieved.
Description
Technical field
The present invention relates to aluminum alloy surface and process especially a kind of preparation method and film forming liquid thereof of aluminium alloy deep green trivalent chromium conversion film.
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 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 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) such as Xi'an University of Architecture and Technology, and contriver's Chinese patent in 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 only is green, do not satisfy the client to the requirement of 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 a kind of preparation method and film forming liquid thereof of aluminium alloy deep green trivalent chromium conversion film, 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: a kind of preparation method and film forming liquid thereof of aluminium alloy deep green trivalent chromium conversion film, this film forming liquid contains:
Chromic salt is chromium sulphate, and mantoquita is copper sulfate, and the vinyl pyridine class is 2-vinyl pyridine or 4-vinylpridine.The pH value of this film forming liquid is 1.2～3.6, and temperature is 5～45 ℃.
Use the preparation method of the aluminium alloy deep green trivalent chromium conversion film of above-mentioned film forming liquid, the 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 processing is that 2～40g/L, temperature are to activate 1～2 minute in 10～40 ℃ the aqueous sodium hydroxide solution 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, be drying to obtain again bottle-green trivalent chromium conversion film.
Drying temperature is 50～75 ℃.
The present invention has added mantoquita and organism vinyl pyridine class 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 deep green 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 deep green, 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 phosphoric acid, mantoquita and vinyl pyridine class to prepare the preparation method's of deep green trivalent chromium conversion film experiment or production technological process.
Embodiment
Fig. 1 has shown preparation method's technical process of aluminium alloy deep green trivalent chromium conversion film of the present invention, wherein sets up the used water of step 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: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 10% sulphuric acid soln 50L first, water cleans 2 times again, then each clear water 100L adds the degreaser 10KG Ridoline212 of Henkel, 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, for new container or new production line, clean with 10% sulphuric acid soln first, 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 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 first, and then water cleans up adding 78KG Cr
2(SO
4)
3And phosphatase 11 .8KG, use deionized water dissolving, add 1.1KG copper sulfate and 0.9KG4-vinyl pyridine, add again deionized water to 450L, mix even must film forming liquid, with the sulphur acid for adjusting pH value to 1.2 of 20% sodium hydroxide or 15%, then temperature adjustment to 5 ℃.
D. prepare deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 75 ℃ of lower dryings namely got bottle-green trivalent chromium conversion film in 30 minutes again.
Embodiment 2 3003 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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 8KGRidoline212 of Henkel, 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, for new container or new production line, clean with 10% sulphuric acid soln first, 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 40 ℃.
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 first, and then water cleans up adding 11KG Cr
2(SO
4)
3And phosphatase 11 8KG, use deionized water dissolving, add 0.12KG copper sulfate and 0.045KG4-vinyl pyridine, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 1.5 of 20% sodium hydroxide or 15%, then be warming up to 45 ℃.
D. prepare deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 70 ℃ of lower dryings 30 minutes and get final product again.
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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 9KGRidoline212 of Henkel, 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 first, 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 building bath, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 18KG Cr
2(SO
4)
3And phosphatase 11 5KG, use deionized water dissolving, add 0.2KG copper sulfate and 0.1KG2-vinyl pyridine, add again deionized water to 450L, mix even must 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. make each deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 65 ℃ of lower dryings 30 minutes and get final product again.
Embodiment 4 5052 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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 8KGRidoline212 of Henkel, 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 first, 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 building bath, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 28KG Cr
2(SO
4)
3And phosphoric acid 8KG, use deionized water dissolving, add 0.3KG copper sulfate and 0.2KG4-vinyl pyridine, 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 deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 70 ℃ of lower dryings namely got bottle-green trivalent chromium chemical conversion film in 30 minutes again.
Embodiment 5 6061 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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 12KGRidoline212 of Henkel, 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 first, 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 building bath, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 42KG Cr
2(SO
4)
3And phosphatase 11 2KG, use deionized water dissolving, add 0.6KG copper sulfate and 0.4KG2-vinyl pyridine, 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. make each deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 60 ℃ of lower dryings 30 minutes and get final product again.
Embodiment 6 6063 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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 10KGRidoline212 of Henkel, 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 first, 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 first, and then water cleans up adding 55KG Cr
2(SO
4)
3And phosphatase 11 6KG, use deionized water dissolving, add 0.8KG copper sulfate and 0.6KG4-vinyl pyridine, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 1.8 of 20% sodium hydroxide or 15%, then be warming up to 40 ℃.
D. prepare deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 60 ℃ of lower dryings 30 minutes and get final product again.
Embodiment 7 7075 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 first, water cleans 2 times again, then each clear water 100L adds the degreaser 10KGRidoline212 of Henkel, 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 first, 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 building bath, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 65KG Cr
2(SO
4)
3And phosphatase 11 0KG, use deionized water dissolving, add 0.9KG copper sulfate and 0.8KG2-vinyl pyridine, add again deionized water to 450L, mix the even film forming liquid that gets, with the sulphur acid for adjusting pH value to 2.2 of 20% sodium hydroxide or 15%, then be warming up to 45 ℃.
D. prepare deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 65 ℃ of lower dryings 30 minutes and get final product again.
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 first, water cleans 2 times again, each clear water 60L, the degreasing powder Ridoline2126KG that then adds Henkel 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 first, 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 building bath, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 25KG KCr (SO
4)
2And phosphoric acid 8KG, add 0.5KG copper sulfate and 0.28KG4-vinyl pyridine, use deionized water dissolving, add again 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 deep green trivalent chromium conversion film:
＜1〉oil removing: the aluminum or aluminum alloy workpiece put into the stainless steel basket or hang on the hanger, through removing the workpiece surface grease in 8 minutes except oil bath, 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, 60 ℃ of lower dryings namely got bottle-green trivalent chromium conversion film in 30 minutes again.
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, clean with 10% sulphuric acid soln 40L first, water cleans 2 times again, each clear water 80L, then the degreasing powder Ridoline2128KG that adds Henkel 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 first, 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 bath of 400L chromaking: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 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, then will be adjusted in the scope with the sulfuric acid of 20% sodium hydroxide or 15%.Then be warming up to 40-50 degree centigrade.
2.4) after above-mentioned Job readiness is good, again workpiece is put into the stainless steel basket 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, 80 degrees centigrade were descended dry 30 minutes, namely obtained the green compound conversion film of trivalent chromium.
Reference examples 2 conventional aluminium alloy sexavalent chrome 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, clean with 10% sulphuric acid soln 40L first, water cleans 2 times again, each clear water 80L, then the degreasing powder Ridoline2128KG that adds Henkel 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 first, 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 bath of 400L chromaking: before building bath, please container is thoroughly cleaned up, for new container or new production line, clean with 15% sulphuric acid soln first, and then water cleans up adding 20KG K
2Cr
2O
7And phosphoric acid 8KG, 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, then will be adjusted in the scope with the sulfuric acid of 20% sodium hydroxide or 15%.Then be warming up to 50-60 degree centigrade.
2.4) after above-mentioned Job readiness is good, again workpiece is put into the stainless steel basket or hung on the hanger, through oil removing 6 minutes, cleaned 2 minutes, activate 2 minutes, cleaned 2 minutes, chromaking 6 minutes was cleaned 2 minutes at last, drying is 30 minutes under 100 degrees centigrade, 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, 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 conversion film is deep green, 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. preparation method and the film forming liquid thereof of an aluminium alloy deep green trivalent chromium conversion film is characterized in that this film forming liquid contains:
2. the film forming liquid of aluminium alloy deep green trivalent chromium conversion film according to claim 1, it is characterized in that: described chromic salt is chromium sulphate, and described mantoquita is copper sulfate, and described vinyl pyridine class is 2-vinyl pyridine or 4-vinylpridine.
3. the preparation method of deep green trivalent chromium conversion film according to claim 1 and 2 and film forming liquid thereof, the pH value that it is characterized in that this film forming liquid is 1.2～3.6, temperature is 5～45 ℃.
4. right to use requires the preparation method of the aluminium alloy deep green trivalent chromium conversion film of 3 described film forming liquid, it is characterized in that the 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 processing is that 2～40g/L, temperature are to activate 1～2 minute in 10～40 ℃ the aqueous sodium hydroxide solution 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, be drying to obtain again.
5. right to use requires the preparation method of the aluminium alloy deep green trivalent chromium conversion film of 4 described film forming liquid, and it is characterized in that: described drying temperature is 50-75 ℃.
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|---|---|---|---|---|
| CN107604348A (en) * | 2017-09-26 | 2018-01-19 | 中国石油大学(华东) | A kind of new green environment protection trivalent chromium conversion membrane preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102174694A (en) * | 2011-03-22 | 2011-09-07 | 广西民族大学 | Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102174694A (en) * | 2011-03-22 | 2011-09-07 | 广西民族大学 | Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof |
Non-Patent Citations (1)
| Title |
|---|
| 黄旋等: "铝合金三价铬钝化研究进展", 《材料保护》, vol. 44, no. 4, 30 April 2011 (2011-04-30), pages 41 - 44 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604348A (en) * | 2017-09-26 | 2018-01-19 | 中国石油大学(华东) | A kind of new green environment protection trivalent chromium conversion membrane preparation method |
| CN107604348B (en) * | 2017-09-26 | 2021-01-08 | 中国石油大学(华东) | Preparation method of green environment-friendly trivalent chromium conversion coating |
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Application publication date: 20130206 |