CN104451852A - Electrolytic cleaning technology applicable to aluminum surface - Google Patents
Electrolytic cleaning technology applicable to aluminum surface Download PDFInfo
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- CN104451852A CN104451852A CN201410688777.1A CN201410688777A CN104451852A CN 104451852 A CN104451852 A CN 104451852A CN 201410688777 A CN201410688777 A CN 201410688777A CN 104451852 A CN104451852 A CN 104451852A
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Abstract
The invention provides an electrolytic cleaning technology applicable to an aluminum surface, which comprises the following steps of 1) performing precleaning: softening, separating and dissolving a pollutant on a workpiece by a hot dipping or spraying method, 2) performing electrolytic cleaning: performing cleaning for 0.05-0.1s with current density of 120-150A/dm<2> by the action of a water-based cleaning agent, 3) performing brushing: brushing a metal surface with alkaline liquid for 3 times to remove scrap iron and oil stain on the surface, and 4) performing rinsing: rinsing out dirt which falls off but still floats on the surface of the workpiece with flowing clear water and then performing hot air drying, wherein the water-based cleaning agent comprises the following components: 0.8-1.2g/l surfactant KE-1, 2.0-2.5g/l surfactant SDBS (Sodium Dodecyl Benzene Sulfonate), 2.2-2.6g/l surfactant NP-10, 0.5-0.6g/l builder, 0.8-1g/l composite corrosion inhibitor and water as a solvent.
Description
Technical field
The invention belongs to hardware manufacturing industry technical field, be specifically related to a kind of electrolytic cleaning process being applicable to aluminium surface.
Background technology
Cleaning refers to the liquid and solid pollutant of removing workpiece surface, makes the cleanliness factor that workpiece surface reaches certain.Cleaning is also one very important middle aided process in heat treatment production process.Allly to add through machine, workpiece before thermal treatment all should carry out.Otherwise the greasy dirt etc. on the forward and backward workpiece surface of thermal treatment directly enters heating volatilization and burning in stove, and easily cause workshop air to pollute, workpieces surface condition is also bad, even affects thermal treatment quality, particularly to thermo-chemical treatment and vacuum heat treatment.Cleaning can improve treatment production efficiency and thermal treatment quality, the environmental protection relevant with thermal treatment, and cleaning belongs to clean heat treatment category.
Complete electrolytic cleaning process comprises the operations such as pre-washing, electrolytic cleaning, rinsing and oven dry, and wherein electrolytic cleaning is core.Electrolytic cleaning is that the effect that produces electrolysis in metallic surface removes the oil of metallic surface, iron powder and other loose material by the strong base solution of metal by heat.It is an important factor affecting cleaning performance that the one-tenth of clean-out system is grouped into cleaning performance, which determine residue and whether can depart from metallic surface completely, whether the pollutent departing from metallic surface can emulsified and saponification well, avoids again producing metal polluting.General all uses coventional type electrolytic cleaning process at present, the current density of coventional type electrolytic clean unit is generally at 5.4 ~ 21.6 A/dm
2between, polar plate spacing is 51 ~ 152 mm.Because current density is lower, therefore pole plate length is comparatively large, and electrolysis total time is longer, and power consumption is higher.
Aluminium density is little, although matter is soft, can be made into alloy, so be widely used in the production such as aircraft, boats and ships, automobile.The electroconductibility of aluminium is also better, although electric conductivity is not as copper, aluminium conductor unit weight is light and with low cost, and the oxide film that surface is formed has certain insulativity, so be widely used in the industry such as electric apparatus manufacture, radio industry.Aluminium has the stronger capacity of heat transmission, so be made into various heat-exchange equipment, cooker etc.If accumulate in the equipment be manufactured from aluminium or attachment residual oil, reasonably clean with regard to needs.But the most alkalescence of oil-removing cleaning agent is in the past comparatively strong, and also need the condition by high temperature, such clean-out system has very large loss to resource, the energy, and easily causes security incident, causes environmental pollution.Development of new take tensio-active agent as the water system residual oil carbon steel clean-out system of main wash composition, can efficient, safety, environmental protection removing steel surface residual oil, all there is realistic meaning from the angle of economy, safety and environmental protection.
CN91109760.0, the application for a patent for invention that name is called " water-soluble metal cleaning liquor ", this scavenging solution take water as solvent, adds emulsifying agent sodium laurylsulfonate, OP-10; Rust-preventive agent sodium pentachlorophenate, Sodium Benzoate, Sodium Nitrite; Clean-out system trolamine, polyoxyethylene glycol, ethanol, phosphoric acid are formulated, and it can be used for the cleaning of various steel, cast iron product.But it is many that shortcoming is foam, and electric conductivity is low, general needs heats use, is not suitable for electrolytic cleaning.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of electrolytic cleaning process being applicable to aluminium surface.This technique cleaning performance is good, and soil removability is strong, and residual oil degreasing rate can reach more than 99.5%, and rustless property is good.
In order to realize foregoing invention object, the present invention adopts following technical scheme:
Be applicable to the electrolytic cleaning process on aluminium surface, it is characterized in that:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening, and alleviates the load of lower road matting;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 120 ~ 150 A/dm
2current density cleaning 0.05-0.1s;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 0.8-1.2 g/l
Tensio-active agent SDBS 2.0-2.5 g/l
Tensio-active agent NP-10 2.2-2.6 g/l
Washing assistant 0.5-0.6 g/l
Composite corrosion inhibitor 0.8-1 g/l
Solvent is water.
The screening and application of tensio-active agent is the key of aluminium surface water based cleaning agent.The present invention selects tensio-active agent KE-1, SDBS and NP-10 can reduce the surface tension of system, effectively can promote wetting, the infiltration of aluminium surface and oil contaminant, emulsification and dispersion, be cleaned up by aluminium surface and oil contaminant.By electrolytic action, by clean-out system working fluid component rapid permeability between greasy dirt and metal, greasy dirt is made to peel off rapidly aluminium surface, peel off rear surface promoting agent by grease emulsifying, under the effect of electrolysis, grease broken up and be uniformly distributed in system, improve the oil removing performance of aqueous cleaning agent highly.
On the other hand, due in the functional group of tensio-active agent KE-1, SDBS and NP-10 with multiple-limb branched structure, for the tensio-active agent of linear chain structure, its obstruction discharge opeing on liquid membrane surface and " reparation " effect reduce greatly, froth stability weakens, and after therefore bubbling, lather collapse must than comparatively fast.They are composite, good froth breaking and cleaning performance can be reached, meet the requirement of cleaning.
Preferably, described washing assistant is the one or more kinds of combinations in tripoly phosphate sodium STPP, 4A zeolite and water glass.
Preferably, described composite corrosion inhibitor is that polyethylene and tetrahydroglyoxaline are composite.
Further preferably, the composite mass ratio of described polyethylene and tetrahydroglyoxaline is 1:1.
Inhibiter polyethylene and tetrahydroglyoxaline are attracted to metallic surface through chemisorption process, and itself forms one deck film closely, or form one deck film closely after reacting with metal ion, therefore corrosion mitigating effect is good.When its addition is 0.6 g/l, minimum corrosion rate can reach 0.3%.
Preferably, the massfraction of described clean-out system cleaning performance when 2%-3% is best.
OH in alkali lye of the present invention
-volumetric molar concentration be 0.5-0.6mol/L.
Electrolysis temperature of the present invention is 75-80 DEG C.
Polar plate spacing of the present invention is 20 mm.
Hot-air seasoning of the present invention, refers at 90-110 DEG C, dries 3-8min.
Beneficial effect of the present invention is:
1, better cleaning performance, soil removability is strong, and residual oil degreasing rate can reach more than 99.5%, and rustless property is good.
2, realize more speed, linear velocity reaches as high as 900 m/min.
3, shorten the electrolytic cleaning time, can effectively shorten unit length.
Embodiment
Below in conjunction with embodiment, essentiality content of the present invention is described in further detail.
Embodiment 1
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 100A/dm
2current density cleaning 0.1s;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 0.8g/l
Tensio-active agent SDBS 2.0g/l
Tensio-active agent NP-10 2.2 g/l
Tripoly phosphate sodium STPP 0.5g/l
Composite corrosion inhibitor 0.8g/l
Solvent is water.
Embodiment 2
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 150 A/dm
2current density cleaning 0.05s;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.5mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 1.2 g/l
Tensio-active agent SDBS 2.5 g/l
Tensio-active agent NP-10 2.6 g/l
4A zeolite 0.6 g/l
Composite corrosion inhibitor 1 g/l
Solvent is water.
Embodiment 3
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 110 A/dm
2current density cleaning 0.06s, electrolysis temperature is 70 DEG C;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.6mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 0.9g/l
Tensio-active agent SDBS 2.1 g/l
Tensio-active agent NP-10 2.3 g/l
Water glass 0.52g/l
Polyethylene and tetrahydroglyoxaline 0.9g/l
Solvent is water.
Embodiment 4
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 120A/dm
2current density cleaning 0.07s, electrolysis temperature is 90 DEG C, and polar plate spacing is 20 mm;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.55mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 0.9g/l
Tensio-active agent SDBS 2.3g/l
Tensio-active agent NP-10 2.5g/l
Tripoly phosphate sodium STPP and water glass 0.55g/l
Polyethylene and tetrahydroglyoxaline 0.85g/l
Solvent is water.
The massfraction of described clean-out system when cleaning is 2.5%.
Embodiment 5
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 130A/dm
2current density cleaning 0.08s, electrolysis temperature is 80 DEG C, and polar plate spacing is 20 mm.
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.52mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 1.0g/l
Tensio-active agent SDBS 2.2g/l
Tensio-active agent NP-10 2.2g/l
Tripoly phosphate sodium STPP and 4A zeolite 0.56g/l
Polyethylene and tetrahydroglyoxaline 0.9g/l
Solvent is water.
The composite mass ratio of described polyethylene and tetrahydroglyoxaline is 1:1.
The massfraction of described clean-out system when cleaning is 2%.
Described hot-air seasoning, refers at 90 DEG C, dries 10min.
Embodiment 6
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 125A/dm
2current density cleaning 0.06s, electrolysis temperature is 75 DEG C, and polar plate spacing is 20 mm.
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.56mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 1.0g/l
Tensio-active agent SDBS 2.3 g/l
Tensio-active agent NP-10 2.2 g/l
Tripoly phosphate sodium STPP and water glass 0.55g/l
Polyethylene and tetrahydroglyoxaline 0.8g/l
Solvent is water.
The composite mass ratio of described polyethylene and tetrahydroglyoxaline is 1:1.
The massfraction of described clean-out system when cleaning is 3%.
Described hot-air seasoning, refers at 110 DEG C, dries 3min.
Embodiment 7
Be applicable to the electrolytic cleaning process on aluminium surface, processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 135 A/dm
2current density cleaning 0.09s, electrolysis temperature is 85 DEG C, and polar plate spacing is 20 mm.
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
OH in described alkali lye
-volumetric molar concentration be 0.58mol/L.
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 1.1g/l
Tensio-active agent SDBS 2.4 g/l
Tensio-active agent NP-10 2.2 g/l
Tripoly phosphate sodium STPP and water glass 0.55g/l
Polyethylene and tetrahydroglyoxaline 0.8g/l
Solvent is water.
The composite mass ratio of described polyethylene and tetrahydroglyoxaline is 1:1.
The massfraction of described clean-out system when cleaning is 3%.
Described hot-air seasoning, refers at 100 DEG C, dries 6min.
Embodiment 8
Dustiness is tested
Electrolytic cleaning process of the present invention the results are shown in Table 1 to the dustiness after aluminium surface cleaning.
Table 1
As seen from the above table, electrolytic cleaning process of the present invention is excellent to the cleaning performance on aluminium surface, and to operator's toxicological harmless, through simply neutralizing, filtration treatment can discharge, and meets environmental protection requirement.The industries such as automobile, machinery, refrigeration, computer can be widely used in.
Claims (9)
1. be applicable to the electrolytic cleaning process on aluminium surface, it is characterized in that: processing step is as follows:
1) pre-washing
Employing hot dipping is washed or the pollutent on workpiece softens, is separated, dissolves by the method for hydro-peening;
2) electrolytic cleaning
Under the effect of aqueous cleaning agent, with 120 ~ 150 A/dm
2current density cleaning 0.05-0.1s;
3) scrub
Adopt alkali lye to scrub metallic surface 3 times, remove the iron filings on surface and greasy dirt;
4) rinsing
Utilize the water purification of flowing to come off but still float wash dirt on the surface of the workpiece and totally, adopt hot-air seasoning;
The composition and ratio of described aqueous cleaning agent is as follows:
Tensio-active agent KE-1 0.8-1.2 g/l
Tensio-active agent SDBS 2.0-2.5 g/l
Tensio-active agent NP-10 2.2-2.6 g/l
Washing assistant 0.5-0.6 g/l
Composite corrosion inhibitor 0.8-1 g/l
Solvent is water.
2. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: OH in described alkali lye
-volumetric molar concentration be 0.5-0.6mol/L.
3. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: described electrolysis temperature is 75-80 DEG C.
4. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: described polar plate spacing is 20 mm.
5. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: described hot-air seasoning, refers at 90-110 DEG C, dries 3-8min.
6. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: described washing assistant is the one or more kinds of combinations in tripoly phosphate sodium STPP, 4A zeolite and water glass.
7. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: described composite corrosion inhibitor is that polyethylene and tetrahydroglyoxaline are composite.
8. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 7, is characterized in that: the composite mass ratio of described polyethylene and tetrahydroglyoxaline is 1:1.
9. a kind of electrolytic cleaning process being applicable to aluminium surface according to claim 1, is characterized in that: the massfraction of described aqueous cleaning agent when cleaning is 2%-3%.
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| CN201410688777.1A CN104451852A (en) | 2014-11-26 | 2014-11-26 | Electrolytic cleaning technology applicable to aluminum surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106601483A (en) * | 2016-12-09 | 2017-04-26 | 深圳市兴创嘉科技有限公司 | Solid aluminum electrolytic capacitor manufacturing method |
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