CN105200508A - Bright engine cylinder cover surface treatment method - Google Patents
Bright engine cylinder cover surface treatment method Download PDFInfo
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- CN105200508A CN105200508A CN201510641868.4A CN201510641868A CN105200508A CN 105200508 A CN105200508 A CN 105200508A CN 201510641868 A CN201510641868 A CN 201510641868A CN 105200508 A CN105200508 A CN 105200508A
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- cylinder cover
- treatment method
- surface treatment
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- cylinder head
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a bright engine cylinder cover surface treatment method. The bright engine cylinder cover surface treatment method comprises the following steps of electrolysis procedure: performing electrolysis on a cylinder cover in electrolyte arranged in an electrolytic bath; soaking procedure: soaking the electrolyzed cylinder cover in protection liquid; and solidifying procedure: solidifying the soaked cylinder cover so that a protection film is formed on the surface of the cylinder cover. The electrolyte contains sodium sulfate with concentration of 18g/L, zincite with concentration of 3.5g/L, sodium superoxide with concentration of 4g/L, sodium alkyl sulfonate with concentration of 1g/L, and the balanced water. By the engine cylinder cover surface treatment method, the surface of the cylinder cover can be clean, burnt-on sand of an inner duct of the cylinder cover can be removed, a black or grey surface caused by shot blasting is avoided, the protection film capable of preventing mildew spots is obtained, and has good discoloration resistance and corrosion resistance, the bright and attractive cylinder cover can be obtained, and the cylinder cover has effects of preventing corrosion and mildew spots.
Description
Technical field
The invention belongs to technical field of engines, specifically, the present invention relates to a kind of bright engine cylinder cap surface treatment method.
Background technology
Aluminium alloy cylinder lid is the general engine component of small-sized bridge car, and compared with cast-iron head, it has light specific gravity, and casting, the advantage that difficulty of processing is low, obtain and apply widely in kart.
The composition of aluminium alloy cylinder lid is generally aluminum silicon alloy, have the advantage that castability is good, mechanical property is higher, but Silicon In Alloys content is also for surface treatment brings difficulty.
At present, for the surface treatment of aluminium alloy cylinder lid, main employing sandblasting or shot peening, in order to cost-saving, the starting material of sandblasting or shot-peening, sand or shot all adopt reusable mode.
Sand or its surface of shot of recycling are stained with large gauging, and when these balls or sand blasting get to aluminium alloy cylinder cap surface, cause aluminium alloy cylinder cap surface to turn black or burnt hair, do not have metallic luster, appearance unsightly.The aluminium alloy cylinder cap surface of sandblasting simultaneously or shot peening does not also possess anticorrosion ability, when product inventory, causes aluminum alloy surface to produce corrosion mildew.And the visa that the aluminium alloy cylinder lid producing mildew cannot obtain client receives.
In order to avoid mildew produces, aluminum alloy surface adopts chromate conversion liquid to process usually.The chemical conversion treatment of the chromic compound of aluminium alloy has many, as the Ah more just Luo Dingfa invented by american chemical pigment company, adopt the conversion film that chromic salt process is formed, there is superior solidity to corrosion, but containing harmful potassium ferricyanate, the hexavalent chromium polluted environment of hypertoxic carcinogens in this conversion fluid, its production is high to environmental requirement, and wastewater treatment is numerous and diverse, expensive.In addition, owing to containing sexavalent chrome in the protective membrane of formation, therefore consider from the angle of production environment, use safety, chromic salt treatment process is all cancelled in pressure in countries in the world.European Union's in February, 2003 promulgation that the world today is of greatest concern, the RoHS instruction of " the using some objectionable impurities about restriction in electronic and electrical equipment " of implementing on July 1st, 2006, specify that on July 1st, 2006 rises, the new electric equipment products entering EU market should not containing comprising six kinds of objectionable impuritiess such as sexavalent chrome, its object is to improve the recovery of scrapping electric equipment products and recirculation rate, secondary pollution that minimizing electric equipment products waste material causes water source and soil, the Sustainable development that ensures society.Some states of AAA and the U.S. are also being discussed and prohibitting the use sexavalent chrome conversion film on trolley parts, and the formally legislation in 2007.
In sum, be no matter single shot peening or shot-peening and chromic salt combination treatment technology, all there is larger drawback in aluminium alloy cylinder lid, cylinder head surface is bright not, does not also possess anticorrosion ability.
Summary of the invention
The invention provides a kind of bright engine cylinder cap surface treatment method, object obtains light cylinder head attractive in appearance, makes cylinder head possess the anti-mildew effect of protection against corrosion simultaneously.
To achieve these goals, the technical scheme that the present invention takes is: bright engine cylinder cap surface treatment method, comprises step:
(1) electrowinning process: being arranged in the electrolytic solution in electrolyzer, electrolysis is carried out to cylinder head;
(2) operation is soaked: the cylinder head after electrolysis is put into protective liquid and soaks;
(3) curing process: the cylinder head after soaking be cured, makes cylinder head surface form protective membrane;
In described electrolytic solution, sodium sulfate concentration is 18g/L, and zinc oxide concentration is 3.5g/L, and sodium peroxide concentration is 4g/L, and sodium laurylsulfonate concentration is 1g/L, and surplus is water.
In described electrowinning process, electrolytic current density is 2A/dm
2.
In described electrowinning process, electrolysis time is 4 minutes.
Described protective liquid is sol gel solution.
Engine cylinder cap surface treatment method of the present invention; cylinder head can be made to obtain the outward appearance of surface clean; and the scab of cylinder head inner duct also can be removed; the blackout avoiding shot-peening to produce or burnt hair appearance; obtain the protective membrane of anti-mildew simultaneously; protective membrane has good resistance to high variable color, corrosion resistant performance, obtains the cylinder head that light is attractive in appearance, makes cylinder head possess the anti-mildew effect of protection against corrosion simultaneously.
Embodiment
Below by the description to embodiment, be described in further detail the specific embodiment of the present invention, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present invention, technical scheme, and contribute to its enforcement.
The invention provides a kind of bright engine cylinder cap surface treatment method, comprise step:
(1) electrowinning process: being arranged in the electrolytic solution in electrolyzer, electrolysis is carried out to cylinder head;
(2) operation is soaked: the cylinder head after electrolysis is put into protective liquid and soaks;
(3) curing process: the cylinder head after soaking be cured, makes cylinder head surface form protective membrane.
Specifically, treatment process of the present invention is mainly applicable to the engine cylinder cap of aluminum alloy material, in electrowinning process, adopt the scar of electrolytic process cleaning aluminium alloy cylinder cap surface, scab, stain, electrolytic process has the effect processing totally and effectively can remove the scab of foundry goods inner duct.
As preferably, in the electrolytic solution that electrowinning process adopts, sodium sulfate concentration is 15-20g/L, and zinc oxide concentration is 2-5g/L, and sodium peroxide concentration is 3-4g/L, and sodium laurylsulfonate concentration is 1-2g/L, and surplus is water.
As preferably, in electrowinning process, electrolytic current density is 1-2A/dm
2, electrolysis time is 3-6 minute, and during employing electrolysis, the surface of aluminium alloy cylinder lid can produce the dirts such as bubble removal scar, scab.Electric current is unsuitable excessive, and excessive electric current can cause product surface to turn black, and electric current is too small, reacts insufficient, clears up unclean.
After electrolysis completes, aluminium alloy cylinder lid is lifted out from electrolyzer, then adopt high pressure draft spray degasification cylinder lid surface to hang water, and cylinder head is dried naturally.
Soak in operation, adopt dip coating to immerse in protective liquid by the whole cylinder head cleaned up, again cylinder head is lifted out after soaking for some time.
As preferably, soak in operation, the protective liquid of employing is SO
2-Al
2o
3sol gel solution.Soak in operation, soak time is 30 seconds.
In curing process, after cylinder head is lifted out, high pressure air rifle is adopted to blow the collosol and gel extension amount of cylinder head excess surface off, and cylinder head is dried naturally, be cured, cylinder head surface is formed and can prevent aluminium alloy variable color, mouldy transparent protective film, obtain the aluminium alloy cylinder lid with metalluster; SO
2-Al
2o
3the hybrid protection of sol gel solution has resistance to elevated temperatures, after cylinder head installation uses, can also play the effect of protection, postpone the work-ing life of aluminium alloy.
As preferably, the composition of protective liquid is SO
2and Al
2o
3, be SO by weight percentage
285%, Al
2o
315%.Protective liquid does not adopt common chemical conversion film, and not containing carcinogens six chromium valency, not containing hypertoxic potassium ferricyanate, adopting the collosol and gel protection embrane method of environmental protection, is the technology application of environmental protection.The preparation process of protective liquid is as follows:
A, 20 kilogram of nine water aluminum nitrate is dissolved in 30L water, stirs 3 ~ 5min;
B, priority add 16L tetraethoxy, 5L Glacial acetic acid, 60L dehydrated alcohol, 5L hydrochloric acid, 2L ethylene glycol;
C, again temperature of reaction kettle is adjusted to 80 degrees Celsius, stirs 10min, insulation 2h, ageing 12h.
D, gained solution are clarified liq, and micro-band is yellow, has thickness sense.Particle surface group in solution is cross-linked with each other, and forms latticed molecular structure, and collosol and gel forms by Al, Si and O atom is interconnected.
As preferably, in treatment process of the present invention, need regularly to adopt gac by the oily waste degradation in electrolytic solution, concrete operations are, are imported in electrolytic solution by the gac of 10g/L, stir 20 minutes, and employing filter is by electrolyte filtering.The concentration of periodic detection electrolytic solution, compensates electrolytic solution, reaches concentration standard.
Embodiment one
Present embodiments provide a kind of surface treatment method of bright engine cylinder cap, comprise following step:
(1) electrowinning process: being arranged in the electrolytic solution in electrolyzer, electrolysis is carried out to cylinder head;
In electrolytic solution, sodium sulfate concentration is 15g/L, and zinc oxide concentration is 3g/L, and sodium peroxide concentration is 3g/L, and sodium laurylsulfonate concentration is 2g/L, and surplus is water; Electrolytic current density is 1A/dm
2, electrolysis time 5 minutes.
(2) operation is soaked: the cylinder head after electrolysis is put into protective liquid and carry out immersion 30 seconds;
(3) curing process: after cylinder head is lifted out; high pressure air rifle is adopted to blow the collosol and gel extension amount of cylinder head excess surface off; and cylinder head is dried naturally; be cured; cylinder head surface is formed and can prevent aluminium alloy variable color, mouldy transparent protective film, obtain the aluminium alloy cylinder lid with metalluster.
Embodiment two
Present embodiments provide a kind of surface treatment method of bright engine cylinder cap, comprise following step:
(1) electrowinning process: being arranged in the electrolytic solution in electrolyzer, electrolysis is carried out to cylinder head;
In electrolytic solution, sodium sulfate concentration is 18g/L, and zinc oxide concentration is 3.5g/L, and sodium peroxide concentration is 4g/L, and sodium laurylsulfonate concentration is 1g/L, and surplus is water; Electrolytic current density is 2A/dm
2, electrolysis time 4 minutes.
(2) operation is soaked: the cylinder head after electrolysis is put into protective liquid and carry out immersion 30 seconds;
(3) curing process: after cylinder head is lifted out; high pressure air rifle is adopted to blow the collosol and gel extension amount of cylinder head excess surface off; and cylinder head is dried naturally; be cured; cylinder head surface is formed and can prevent aluminium alloy variable color, mouldy transparent protective film, obtain the aluminium alloy cylinder lid with metalluster.
Above to invention has been exemplary description.Obviously, specific implementation of the present invention is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; Or without improvement, above-mentioned design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention.
Claims (4)
1. bright engine cylinder cap surface treatment method, is characterized in that, comprise step:
(1) electrowinning process: being arranged in the electrolytic solution in electrolyzer, electrolysis is carried out to cylinder head;
(2) operation is soaked: the cylinder head after electrolysis is put into protective liquid and soaks;
(3) curing process: the cylinder head after soaking be cured, makes cylinder head surface form protective membrane;
In described electrolytic solution, sodium sulfate concentration is 18g/L, and zinc oxide concentration is 3.5g/L, and sodium peroxide concentration is 4g/L, and sodium laurylsulfonate concentration is 1g/L, and surplus is water.
2. bright cylinder head surface treatment method according to claim 1, is characterized in that, in described electrowinning process, electrolytic current density is 2A/dm
2.
3. bright engine cylinder cap surface treatment method according to claim 1, is characterized in that, in described electrowinning process, electrolysis time is 4 minutes.
4. bright engine cylinder cap surface treatment method according to claim 1, is characterized in that, described protective liquid is sol gel solution.
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| CN201510641868.4A CN105200508B (en) | 2015-09-30 | 2015-09-30 | Bright engine cylinder cover surface treatment method |
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|---|---|---|---|
| CN201510641868.4A CN105200508B (en) | 2015-09-30 | 2015-09-30 | Bright engine cylinder cover surface treatment method |
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| CN105200508A true CN105200508A (en) | 2015-12-30 |
| CN105200508B CN105200508B (en) | 2017-05-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1044963A (en) * | 1963-06-28 | 1966-10-05 | Brockway Glass Co Inc | Method of electrolytically cleaning iron moulds |
| US4475995A (en) * | 1982-05-29 | 1984-10-09 | Robert Bosch Gmbh | Method for electrochemical removal of metallic work material |
| CN101457387A (en) * | 2007-12-13 | 2009-06-17 | 广西玉柴机器股份有限公司 | Method for removing cross-hole bur |
| CN201306224Y (en) * | 2008-11-17 | 2009-09-09 | 重庆博奥实业有限公司 | Magnesium alloy cylinder head of automotive engine |
| US20110210011A1 (en) * | 2010-03-01 | 2011-09-01 | Chih-Feng Ho | Method for cleaning surface of stainless steel |
| CN102234832A (en) * | 2011-06-30 | 2011-11-09 | 清华大学 | Precise controllable electrolysis removal technology for burrs on inner bore intersection line of mechanical metal part |
| CN103272749A (en) * | 2013-06-07 | 2013-09-04 | 山东国强五金科技有限公司 | Surface treatment method of zinc alloy die casting |
-
2015
- 2015-09-30 CN CN201510641868.4A patent/CN105200508B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1044963A (en) * | 1963-06-28 | 1966-10-05 | Brockway Glass Co Inc | Method of electrolytically cleaning iron moulds |
| US4475995A (en) * | 1982-05-29 | 1984-10-09 | Robert Bosch Gmbh | Method for electrochemical removal of metallic work material |
| CN101457387A (en) * | 2007-12-13 | 2009-06-17 | 广西玉柴机器股份有限公司 | Method for removing cross-hole bur |
| CN201306224Y (en) * | 2008-11-17 | 2009-09-09 | 重庆博奥实业有限公司 | Magnesium alloy cylinder head of automotive engine |
| US20110210011A1 (en) * | 2010-03-01 | 2011-09-01 | Chih-Feng Ho | Method for cleaning surface of stainless steel |
| CN102234832A (en) * | 2011-06-30 | 2011-11-09 | 清华大学 | Precise controllable electrolysis removal technology for burrs on inner bore intersection line of mechanical metal part |
| CN103272749A (en) * | 2013-06-07 | 2013-09-04 | 山东国强五金科技有限公司 | Surface treatment method of zinc alloy die casting |
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Address after: Zhi Zhen Wuhu County in Anhui province Wuhu city Anhui Bay 241100 Wuhu Economic Development Zone Sunshine Road No. 2188 Building 2 Patentee after: Wuhu Yongyu auto industry Limited by Share Ltd Address before: 241100 Wuhu City, Wuhu Province Machinery Industrial Development Zone, sunshine road, No. 2188, No. Patentee before: Wuhu YongYu Autocar Industrial Co., Ltd. |
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