CN103212550B - Cleaning method before a kind of Aluminum alloy airplane skin spot welding - Google Patents
Cleaning method before a kind of Aluminum alloy airplane skin spot welding Download PDFInfo
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- CN103212550B CN103212550B CN201310145488.2A CN201310145488A CN103212550B CN 103212550 B CN103212550 B CN 103212550B CN 201310145488 A CN201310145488 A CN 201310145488A CN 103212550 B CN103212550 B CN 103212550B
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Abstract
The invention belongs to process for treating surface, relate to the improvement to cleaning method before Aluminum alloy airplane skin spot welding.It is characterized in that, the step of cleaning is as follows: alkali cleans; Caustic corrosion; Chromatosulfuric acid is washed; Pickling; Dry.The present invention cleans new method before proposing a kind of Aluminum alloy airplane skin spot welding, solves uneven pull-off strength after being coated with spot welding glue and is worth a underproof difficult problem, improve the qualification rate of product.
Description
Technical field
The invention belongs to process for treating surface, relate to the improvement to cleaning method before Aluminum alloy airplane skin spot welding.
Background technology
Certain type machine is in part production process, and the spot welding glue that the trade mark is 425-3 can be used in the Skin Parts edge of aircraft, and the supplier of this spot welding glue is Shanghai synthetic resin research institute.The non-molten watertight sealing that this spot welding glue is made up of epoxy resin, filler, flexibilizer, curing agent etc., be coated in metalwork welding edge position, the glued membrane of formation has sealing, waterproof, antirust effect.All somes weldments all will clean before spot welding, and to remove dirt and the oxide skin on surface, the performance of spot welding could improve, and the uneven pull-off strength value of the spot welding glue be coated with afterwards could be qualified.But with stove test piece, what at present find spot welding glue at workshop repeatedly occurs that uneven pull-off strength is worth underproof problem.According to 2011 annual data statistics, in 9 batches of parts of processing, have the spot welding glue of 7 batches of parts defective with stove test piece uneven pull-off strength value, disqualification rate reaches 77.8%, has had a strong impact on the progress of producing.
Summary of the invention
The object of the invention is: propose cleaning method before a kind of Aluminum alloy airplane skin spot welding, with solve be coated with spot welding glue after uneven pull-off strength be worth a underproof difficult problem, improve the qualification rate of product.
Technical scheme of the present invention is: cleaning method before a kind of Aluminum alloy airplane skin spot welding, and be the process before the spot welding glue of 425-3 for the aircraft skin edge coating trade mark that 0.5mm ~ 0.6mm is thick, it is characterized in that, the step of cleaning is as follows:
1, alkali cleaning: aircraft skin is soaked 10min ~ 15min in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 37.5g/L ~ 60g/L, the temperature of alkaline solution is 49 DEG C ~ 60 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current;
2, caustic corrosion: aircraft skin is immersed in NaOH and Na
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 20g/L ~ 35g/L, Na
2cO
3the concentration of solution is 20g/L ~ 30g/L, and the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 40 DEG C ~ 55 DEG C, and soak time is 2min ~ 3min, uses compressed air to stir in caustic corrosion process;
3, chromatosulfuric acid is washed: be immersed in by aircraft skin in the mixed solution of sulfuric acid and chromic anhydride and carry out chromatosulfuric acid and wash, in mixed solution, the concentration of sulfuric acid is 250g/L ~ 300g/L, the concentration of chromic anhydride is 45g/L ~ 55g/L, solvent is deionized water, the temperature of mixed solution is 60 DEG C ~ 65 DEG C, soak time is 3min ~ 5min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current;
4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 80g/L ~ 100g/L, the concentration of phosphoric acid is 10g/L ~ 70g/L, the concentration of potassium bichromate is 5g/L ~ 8g/L, solvent is deionized water, the temperature of mixed acid dilution is room temperature, soak time is 9min ~ 11min, compressed air is used to stir in acid cleaning process, then take out aircraft skin to drain, then use the deionized water wash clean of adverse current;
5, dry: aircraft skin to be put in drying box, drying at least 30min at 60 DEG C ~ 80 DEG C temperature.
Advantage of the present invention is: clean new method before proposing a kind of Aluminum alloy airplane skin spot welding, solves uneven pull-off strength after being coated with spot welding glue and is worth a underproof difficult problem, improve the qualification rate of product.Test proves, after employing the present invention, the qualification rate of product from rising violently more than 90% 20% more.
Detailed description of the invention
Below the present invention is described in further details.Cleaning method before a kind of Aluminum alloy airplane skin spot welding, be the process before the spot welding glue of 425-3 for the aircraft skin edge coating trade mark that 0.5mm ~ 0.6mm is thick, it is characterized in that, the step of cleaning is as follows:
1, alkali cleaning: aircraft skin is soaked 10min ~ 15min in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 37.5g/L ~ 60g/L, the temperature of alkaline solution is 49 DEG C ~ 60 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current.The main purpose of alkali matting is grease in order to remove aluminum alloy outer cover part surface and dirt;
2, caustic corrosion: aircraft skin is immersed in NaOH and Na
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 20g/L ~ 35g/L, Na
2cO
3the concentration of solution is 20g/L ~ 30g/L, and the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 40 DEG C ~ 55 DEG C, and soak time is 2min ~ 3min, uses compressed air to stir in caustic corrosion process.The object of caustic corrosion can improve the roughness on aluminum alloy outer cover part surface on the one hand, can remove oxide layer and the defect on aluminum alloy outer cover part surface on the other hand, remove stain further again;
3, chromatosulfuric acid is washed: be immersed in by aircraft skin in the mixed solution of sulfuric acid and chromic anhydride and carry out chromatosulfuric acid and wash, in mixed solution, the concentration of sulfuric acid is 250g/L ~ 300g/L, the concentration of chromic anhydride is 45g/L ~ 55g/L, solvent is deionized water, the temperature of mixed solution is 60 DEG C ~ 65 DEG C, soak time is 3min ~ 5min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current.The object of pickling is the mechanical lines (mould line) in order to remove aluminum alloy outer cover part surface, and make surface have more gloss after pickling is complete, mechanical performance can not receive impact;
4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 80g/L ~ 100g/L, the concentration of phosphoric acid is 10g/L ~ 70g/L, the concentration of potassium bichromate is 5g/L ~ 8g/L, solvent is deionized water, the temperature of mixed acid dilution is room temperature, soak time is 9min ~ 11min, compressed air is used to stir in acid cleaning process, then take out aircraft skin to drain, then use the deionized water wash clean of adverse current;
5, dry: in order to prevent trace, aircraft skin to be put in drying box, drying at least 30min at 60 DEG C ~ 80 DEG C temperature.
Operation principle of the present invention is: washing in alkali cleaning and chromatosulfuric acid increases caustic corrosion operation between operation and can improve strip roughness, greatly improve the uneven pull-off strength value of test piece, with current result of the test, increase by 2 minutes caustic corrosion processing times best.
Embodiment 1: aluminum alloy outer cover thickness is 0.5mm, be the aluminum alloy plate materials that 0.5mm is thick with stove 5 test pieces, test piece number is 1-1,1-2,1-3,1-4,1-5:
1, alkali cleaning: 12min will be soaked with stove test piece in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 50g/L, the temperature of alkaline solution is 55 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current;
2, caustic corrosion: NaOH and Na will be immersed in stove test piece
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 31g/L, Na
2cO
3the concentration of solution is 27g/L, and the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 52 DEG C, and soak time is 2min, uses compressed air to stir in caustic corrosion process;
3, chromatosulfuric acid is washed: wash carrying out chromatosulfuric acid in the mixed solution being immersed in sulfuric acid and chromic anhydride with stove test piece, in mixed solution, the concentration of sulfuric acid is 285g/L, the concentration of chromic anhydride is 50g/L, solvent is deionized water, the temperature of mixed solution is 62 DEG C, soak time is 4min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current;
4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 90g/L, the concentration of phosphoric acid is 55g/L, the concentration of potassium bichromate is 7g/L, and solvent is deionized water, and the temperature of mixed acid dilution is room temperature, soak time is 11min, use compressed air to stir in acid cleaning process, then take out aircraft skin and drain, then use the deionized water wash clean of adverse current;
5, dry: aircraft skin to be put in drying box, dry 30min at 70 DEG C of temperature.
The uneven pull-off strength value finally obtained is:
Embodiment 2: aluminum alloy outer cover thickness is 0.5mm, be the aluminum alloy plate materials that 0.5mm is thick with stove 5 test pieces, test piece number is 2-1,2-2,2-3,2-4,2-5:
1, alkali cleaning: 13min will be soaked with stove test piece in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 49g/L, the temperature of alkaline solution is 54 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current;
2, caustic corrosion: NaOH and Na will be immersed in stove test piece
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 30g/L, Na
2cO
3the concentration of solution is 26g/L, and the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 53 DEG C, and soak time is 2min, uses compressed air to stir in caustic corrosion process;
3, chromatosulfuric acid is washed: wash carrying out chromatosulfuric acid in the mixed solution being immersed in sulfuric acid and chromic anhydride with stove test piece, in mixed solution, the concentration of sulfuric acid is 283g/L, the concentration of chromic anhydride is 49g/L, solvent is deionized water, the temperature of mixed solution is 63 DEG C, soak time is 5min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current;
4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 87g/L, the concentration of phosphoric acid is 50g/L, the concentration of potassium bichromate is 7g/L, and solvent is deionized water, and the temperature of mixed acid dilution is room temperature, soak time is 10min, use compressed air to stir in acid cleaning process, then take out aircraft skin and drain, then use the deionized water wash clean of adverse current;
5, dry: aircraft skin to be put in drying box, dry 35min at 70 DEG C of temperature.The uneven pull-off strength value finally obtained is:
Embodiment 3: aluminum alloy outer cover thickness is 0.5mm, be the aluminum alloy plate materials that 0.5mm is thick with stove 5 test pieces, test piece number is 3-1,3-2,3-3,3-4,3-5:
1, alkali cleaning: 12min will be soaked with stove test piece in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 51g/L, the temperature of alkaline solution is 56 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current;
2, caustic corrosion: NaOH and Na will be immersed in stove test piece
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 32g/L, Na
2cO
3the concentration of solution is 26g/L, and the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 53 DEG C, and soak time is 2min, uses compressed air to stir in caustic corrosion process;
3, chromatosulfuric acid is washed: wash carrying out chromatosulfuric acid in the mixed solution being immersed in sulfuric acid and chromic anhydride with stove test piece, in mixed solution, the concentration of sulfuric acid is 280g/L, the concentration of chromic anhydride is 51g/L, solvent is deionized water, the temperature of mixed solution is 63 DEG C, soak time is 5min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current;
4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 86g/L, the concentration of phosphoric acid is 50g/L, the concentration of potassium bichromate is 8g/L, and solvent is deionized water, and the temperature of mixed acid dilution is room temperature, soak time is 10min, use compressed air to stir in acid cleaning process, then take out aircraft skin and drain, then use the deionized water wash clean of adverse current;
5, dry: aircraft skin to be put in drying box, dry 40min at 70 DEG C of temperature.The uneven pull-off strength value finally obtained is:
Claims (1)
1. a cleaning method before Aluminum alloy airplane skin spot welding, be the process before the spot welding glue of 425-3 for the aircraft skin edge coating trade mark that 0.5mm ~ 0.6mm is thick, it is characterized in that, the step of cleaning is as follows:
1.1, alkali cleaning: aircraft skin is soaked 10min ~ 15min in alkaline solution, alkaline solution is the aqueous solution of TURCO4215NCLT, concentration is 37.5g/L ~ 60g/L, the temperature of alkaline solution is 49 DEG C ~ 60 DEG C, compressed air is used to stir in the process of soaking, then take out and drain, and with the deionized water wash clean of adverse current;
1.2, caustic corrosion: aircraft skin is immersed in NaOH and Na
2cO
3mixed base etchant solution in carry out caustic corrosion, in mixed base etchant solution, the concentration of NaOH is 20g/L ~ 35g/L, Na
2cO
3concentration be 20g/L ~ 30g/L, the solvent of caustic corrosion solution is deionized water, and the temperature of mixed base etchant solution is 40 DEG C ~ 55 DEG C, and soak time is 2min ~ 3min, uses compressed air to stir in caustic corrosion process;
1.3, chromatosulfuric acid is washed: be immersed in by aircraft skin in the mixed solution of sulfuric acid and chromic anhydride and carry out chromatosulfuric acid and wash, in mixed solution, the concentration of sulfuric acid is 250g/L ~ 300g/L, the concentration of chromic anhydride is 45g/L ~ 55g/L, solvent is deionized water, the temperature of mixed solution is 60 DEG C ~ 65 DEG C, soak time is 3min ~ 5min, uses compressed air to stir in the washed journey of chromatosulfuric acid, and chromatosulfuric acid is washed rear taking-up aluminum alloy outer cover and drained and the deionized water wash clean using adverse current;
1.4, pickling: aircraft skin is immersed in the mixed acid dilution of nitric acid, phosphoric acid and potassium bichromate and carries out pickling, in mixed acid dilution, the concentration of nitric acid is 80g/L ~ 100g/L, the concentration of phosphoric acid is 10g/L ~ 70g/L, the concentration of potassium bichromate is 5g/L ~ 8g/L, solvent is deionized water, the temperature of mixed acid dilution is room temperature, soak time is 9min ~ 11min, compressed air is used to stir in acid cleaning process, then take out aircraft skin to drain, then use the deionized water wash clean of adverse current;
1.5, dry: aircraft skin to be put in drying box, drying at least 30min at 60 DEG C ~ 80 DEG C temperature.
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| CN105088303A (en) * | 2014-05-16 | 2015-11-25 | 哈尔滨飞机工业集团有限责任公司 | Hard anodizing technological process for 7050 super-thick aluminum alloy |
| CN104818473A (en) * | 2015-05-07 | 2015-08-05 | 哈尔滨飞机工业集团有限责任公司 | Method of chemical conversion of 7010 aluminum alloy |
| CN105780028A (en) * | 2016-01-13 | 2016-07-20 | 哈尔滨飞机工业集团有限责任公司 | Method for removing flow marks and dark spots on surface of aluminum plate |
| CN110202244A (en) * | 2019-07-06 | 2019-09-06 | 太仓欧克仓储设备有限公司 | A kind of welding procedure of sheet metal part welding point |
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