CN104404612A - Electrolytic cleaning process suitable for magnalium surface - Google Patents
Electrolytic cleaning process suitable for magnalium surface Download PDFInfo
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- CN104404612A CN104404612A CN201410689112.2A CN201410689112A CN104404612A CN 104404612 A CN104404612 A CN 104404612A CN 201410689112 A CN201410689112 A CN 201410689112A CN 104404612 A CN104404612 A CN 104404612A
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Abstract
The invention provides an electrolytic cleaning process suitable for a magnalium surface. The process comprises the following steps: 1), pre-cleaning, wherein pollutants on a workpiece are softened, separated and dissolved through a hot dip or spray rinsing manner; 2) electrolytic cleaning, wherein under the action of a water-based cleaning agent, washing is realized with the 100-150 A/dm<2> electric current density for 0.05-0.1 s; 3), scrubbing, a soda solution is used to scrub the metal surface for three times to move iron scales and oil stains on the surface; 4) rinsing, fluid purified water is used to clean up dirt which drops off but still floats on the surface of the workpiece, and the workpiece is dried through hot air. The water-based cleaning agent comprises the following components: a 2.0-3.0 g/l surfactant AO90, a 2.0-2.5 g/l surfactant SDBS, a 2.0-2.2 g/l surfactant NP-10, a 0.5-0.6 g/l builder, a 0.8-1 g/l compound corrosion inhibitor, and a water 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 surface of magnesium aluminium alloy.
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.
According to carbon content number, generally carbon steel can be divided into high carbon steel, medium carbon steel and soft steel three class.The intensity of its medium and high carbon steel is good, poor toughness, so physical strength is little, easily ruptures, the material in uncomfortable cooperation machinery and some fields, and life medium and high carbon steel is often used as the material of making frying pan; The good toughness of soft steel, but intensity is low, is often made into iron wire and uses; If accumulate in the equipment manufactured by carbon steel 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 surface of magnesium aluminium alloy.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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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 100 ~ 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:
Surfactant A O90 2.5-3.0 g/l
Tensio-active agent SDBS 2.0-2.5 g/l
Tensio-active agent NP-10 2.0-2.2 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 surface of magnesium aluminium alloy aqueous cleaning agent.The surface tension that the present invention selects surfactant A O90, AES, NP-7 and NP-10 can reduce system, effectively can promote wetting, the infiltration of surface of magnesium aluminium alloy greasy dirt, emulsification and dispersion, be cleaned up by surface of magnesium aluminium alloy greasy dirt.By electrolytic action, by clean-out system working fluid component rapid permeability between greasy dirt and metal, greasy dirt is made to peel off surface of magnesium aluminium alloy rapidly, 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 surfactant A O90, AES, NP-7 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 sodium carbonate.
Preferably, described composite corrosion inhibitor is that polyethylene, benzotriazole and tetrahydroglyoxaline are composite.
Further preferably, the composite mass ratio of described polyethylene, benzotriazole and tetrahydroglyoxaline is 1:0.5:1.
Inhibiter polyethylene, benzotriazole 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 80-90 DEG C.
Polar plate spacing of the present invention is 20 mm.
Hot-air seasoning of the present invention, refers at 90-100 DEG C, dries 3-10min.
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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 2.5g/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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 3.0 g/l
Tensio-active agent SDBS 2.5 g/l
Tensio-active agent NP-10 2.2g/l
4A zeolite 0.6 g/l
Composite corrosion inhibitor 1 g/l
Solvent is water.
Embodiment 3
Be applicable to an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 2.6g/l
Tensio-active agent SDBS 2.1 g/l
Tensio-active agent NP-10 2.1g/l
Water glass 0.52g/l
Polyethylene, benzotriazole and tetrahydroglyoxaline 0.9g/l
Solvent is water.
Embodiment 4
Be applicable to an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 2.7g/l
Tensio-active agent SDBS 2.3g/l
Tensio-active agent NP-10 2.05g/l
Tripoly phosphate sodium STPP and water glass 0.55g/l
Polyethylene, benzotriazole 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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 2.8g/l
Tensio-active agent SDBS 2.2g/l
Tensio-active agent NP-10 2.15g/l
Tripoly phosphate sodium STPP and 4A zeolite 0.56g/l
Polyethylene, benzotriazole and tetrahydroglyoxaline 0.9g/l
Solvent is water.
The composite mass ratio of described polyethylene, benzotriazole and tetrahydroglyoxaline is 1:0.5:1.
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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 1.0g/l
Surfactant A ES 2.0g/l
Surfactant NP 7 2.1g/l
Tensio-active agent NP-10 2.2 g/l
Tripoly phosphate sodium STPP 0.55g/l
Polyethylene, benzotriazole and tetrahydroglyoxaline 0.8g/l
Solvent is water.
The composite mass ratio of described polyethylene, benzotriazole and tetrahydroglyoxaline is 1:0.5:1.
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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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:
Surfactant A O90 2.6g/l
Tensio-active agent SDBS 2.1g/l
Tensio-active agent NP-10 2.0g/l
Tripoly phosphate sodium STPP and water glass 0.55g/l
Polyethylene, benzotriazole and tetrahydroglyoxaline 0.8g/l
Solvent is water.
The composite mass ratio of described polyethylene, benzotriazole and tetrahydroglyoxaline is 1:0.5:1.
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
After electrolytic cleaning process cleaning of the present invention, dustiness the results are shown in Table 1.
Table 1
As seen from the above table, the cleaning performance of electrolytic cleaning process of the present invention is excellent, 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 an electrolytic cleaning process for surface of magnesium aluminium alloy, 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 100 ~ 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:
Surfactant A O90 2.5-3.0 g/l
Tensio-active agent SDBS 2.0-2.5 g/l
Tensio-active agent NP-10 2.0-2.2 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 surface of magnesium aluminium alloy 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 surface of magnesium aluminium alloy according to claim 1, is characterized in that: described electrolysis temperature is 80-90 DEG C.
4. a kind of electrolytic cleaning process being applicable to surface of magnesium aluminium alloy 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 surface of magnesium aluminium alloy according to claim 1, is characterized in that: described hot-air seasoning, refers at 90-100 DEG C, dries 3-10min.
6. a kind of electrolytic cleaning process being applicable to surface of magnesium aluminium alloy 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 sodium carbonate.
7. a kind of electrolytic cleaning process being applicable to surface of magnesium aluminium alloy according to claim 1, is characterized in that: described composite corrosion inhibitor is that polyethylene, benzotriazole and tetrahydroglyoxaline are composite.
8. a kind of electrolytic cleaning process being applicable to surface of magnesium aluminium alloy according to claim 7, is characterized in that: the composite mass ratio of described polyethylene, benzotriazole and tetrahydroglyoxaline is 1:0.5:1.
9. a kind of electrolytic cleaning process being applicable to surface of magnesium aluminium alloy according to claim 1, is characterized in that: the massfraction of described aqueous cleaning agent when cleaning is 2%-3%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112584294A (en) * | 2020-12-03 | 2021-03-30 | 昆山思瑞奕电子有限公司 | Manufacturing method of light and thin alloy diaphragm |
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Application publication date: 20150311 |