CN105239146B - Engine cylinder cap surface treatment method - Google Patents
Engine cylinder cap surface treatment method Download PDFInfo
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- CN105239146B CN105239146B CN201510641890.9A CN201510641890A CN105239146B CN 105239146 B CN105239146 B CN 105239146B CN 201510641890 A CN201510641890 A CN 201510641890A CN 105239146 B CN105239146 B CN 105239146B
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- cylinder head
- cap surface
- cylinder cap
- surface treatment
- treatment method
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Abstract
The invention discloses a kind of engine cylinder cap surface treatment method, including step：(1) electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；(2) operation is soaked：Cylinder head after electrolysis is put into protective liquid and is soaked；(3) curing process：Cylinder head after immersion is solidified, cylinder cap surface is formed diaphragm.Engine cylinder cap surface treatment method of the invention; cylinder head can be made to obtain the clean outward appearance in surface; and the scab of cylinder head inner duct can also be removed; the nigrescence or burnt hair appearance for avoiding shot-peening from producing; the diaphragm of anti-mildew is obtained simultaneously; diaphragm has good discoloration resistance to high, corrosion resistant performance, light cylinder head attractive in appearance is obtained, while making cylinder head possess the anti-mildew effect of anticorrosion.
Description
Technical field
The invention belongs to technical field of engines, specifically, the present invention relates to a kind of surface treatment of engine cylinder cap
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 proportion
Gently, the low advantage of casting, difficulty of processing, is widely applied in kart.
The composition of aluminium alloy cylinder lid is generally alusil alloy, with the advantage that casting character is good, mechanical property is higher,
But Silicon In Alloys content is also for surface treatment brings difficulty.
At present, it is main to use sandblasting or bead for the surface treatment of aluminium alloy cylinder lid, in order to cost-effective,
Sandblasting or the raw material of shot-peening, sand or shot all use reusable mode.
Its surface of the sand or shot of recycling is stained with big gauging, and aluminium alloy cylinder cap surface is got in these balls or sand blasting
When, cause aluminium alloy cylinder cap surface to black or burnt hair, there is no metallic luster, appearance is unsightly.While sandblasting or bead
Aluminium alloy cylinder cap surface also do not possess anticorrosion ability, in product inventory, cause aluminum alloy surface produce corrosion mildew.
And produce mildew aluminium alloy cylinder lid cannot obtain client visa receive.
In order to avoid mildew is produced, aluminum alloy surface is generally processed using chromate conversion liquid.The sexavalence of aluminium alloy
The chemical conversion treatment of the compound of chromium has a many, Ah more for such as being invented by american chemical pigment company just Luo Dingfa, using chromium
The formed conversion film of hydrochlorate treatment, with superior corrosion resistance, but contains harmful potassium ferricyanate, play in the conversion fluid
The malicious hexavalent chromium polluted environment of carcinogenic substance, its production is high to environmental requirement, and wastewater treatment is numerous and diverse, costliness.Further, since the guarantor for being formed
Contain Cr VI in cuticula, thus from production environment, using safety from the point of view of, countries in the world all are forcing to cancel at chromate
Science and engineering skill.World today's European Union 2003 year promulgation in 2 months of greatest concern, what on July 1st, 2006 implemented《On in electronics
Limited in electric equipment and use some harmful substances》RoHS instruction, it is stipulated that from 1 day July in 2006, into EU market
New electric equipment products should be free of including Cr VI etc. six kinds of harmful substances, scrap electric equipment products its object is to improve
Recovery and recirculation rate, reduce electric equipment products waste material water source and soil are caused secondary pollution, ensure society can
Sustainable development.Some states in AAA and the U.S. are also discussing and are prohibitting the use of Cr VI to convert on automobile component
Film, and the formal legislation in 2007.
In sum, either single bead or shot-peening and chromate mixed processing technology, aluminium alloy cylinder
The drawbacks of lid all has larger, cylinder cap surface is not bright enough, does not also possess anticorrosion ability.
The content of the invention
The present invention provides a kind of engine cylinder cap surface treatment method, it is therefore an objective to obtain light cylinder head attractive in appearance, together
When cylinder head is possessed the anti-mildew effect of anticorrosion.
To achieve these goals, the technical scheme taken of the present invention is：Engine cylinder cap surface treatment method, including
Step：
（1）Electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；
（2）Immersion operation：Cylinder head after electrolysis is put into protective liquid and is soaked；
（3）Curing process：Cylinder head after immersion is solidified, cylinder cap surface is formed diaphragm.
In the electrolyte, sodium sulfate concentration is 15-20g/L, and oxidation zinc concentration is 2-5g/L, and sodium peroxide concentration is 3-
4 g/L, dodecyl sodium sulfate concentration is 1-2g/L, balance of water.
In the electrowinning process, electrolytic current density about 1-2A/dm2。
In the electrowinning process, electrolysis time is 3-6 minutes.
The protective liquid is sol gel solution.
Engine cylinder cap surface treatment method of the invention, can make cylinder head obtain the clean outward appearance in surface, and
The scab of cylinder head inner duct can also be removed, it is to avoid nigrescence or burnt hair appearance that shot-peening is produced, while obtaining the guarantor of anti-mildew
Cuticula, diaphragm has good discoloration resistance to high, corrosion resistant performance, light cylinder head attractive in appearance is obtained, while making cylinder head
Possesses the anti-mildew effect of anticorrosion.
Specific embodiment
Below by the description to embodiment, specific embodiment of the invention is described in further detail, purpose
Be to aid in those skilled in the art has more complete, accurate and deep understanding to design of the invention, technical scheme, and helps
In its implementation.
The invention provides a kind of engine cylinder cap surface treatment method, including step：
（1）Electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；
（2）Immersion operation：Cylinder head after electrolysis is put into protective liquid and is soaked；
（3）Curing process：Cylinder head after immersion is solidified, cylinder cap surface is formed diaphragm.
Specifically, processing method of the invention is primarily adapted for use in the engine cylinder cap of aluminum alloy material, electrowinning process
In, clear up scar, scab, the stain of aluminium alloy cylinder cap surface using electrolysis, electrolysis has treatment clean and can be with
The effectively effect of the scab of removal casting inner duct.
Used as preferred, in the electrolyte that electrowinning process is used, sodium sulfate concentration is 15-20g/L, and oxidation zinc concentration is 2-
5g/L, sodium peroxide concentration is 3-4 g/L, and dodecyl sodium sulfate concentration is 1-2g/L, balance of water.
As preferred, in electrowinning process, electrolytic current density about 1-2A/dm2, electrolysis time is 3-6 minutes, using electricity
The surface of aluminium alloy cylinder lid can produce the dirts such as bubble removal scar, scab during solution.Unsuitable excessive, the excessive electric current meeting of electric current
Cause product surface to black, electric current is too small, react insufficient, clear up unclean.
After the completion of electrolysis, aluminium alloy cylinder lid is lifted out from electrolytic cell, cylinder is then removed using high pressure draught spray
Cap surface hangs water, and cylinder head is dried naturally.
In immersion operation, using in the cylinder head immersion protective liquid that dip coating will be cleaned up entirely, immersion is for a period of time
Again cylinder head is lifted out afterwards.
As preferred, soak in operation, the protective liquid for using is SiO2-Al2O3Sol gel solution.In immersion operation,
Soak time is 30 seconds.
In curing process, after cylinder head is lifted out, the colloidal sol for blowing cylinder head excess surface off using high pressure air rifle coagulates
Glue extension amount, and cylinder head is dried naturally, is solidified, make cylinder cap surface formed can prevent aluminium alloy from changing colour, it is mouldy saturating
Bright diaphragm, obtains the aluminium alloy cylinder lid with metallic luster；SiO2-Al2O3The hybrid protection of sol gel solution has resistance to
High-temperature behavior, after cylinder head installation use, may also operate as the effect of protection, postpone the service life of aluminium alloy.
Used as preferred, the composition of protective liquid is SiO2And Al2O3, by weight percentage it is SiO285%、Al2O3 15%。
Protective liquid does not use common chemical composition coating, without the chromium valency of carcinogenic substance six, without hypertoxic potassium ferricyanate, using the colloidal sol of environmental protection
Gel protects embrane method, 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, successively addition 16L tetraethyl orthosilicates, 5L glacial acetic acid, 60L absolute ethyl alcohols, 5L hydrochloric acid, 2L ethylene glycol；
C, temperature of reaction kettle is adjusted to 80 degrees Celsius again, stirs 10min, be incubated 2h, be aged 12h.
D, resulting solution are supernatant liquid, and micro-strip yellow has sticky sense.Particle surface group in solution is cross-linked with each other,
Latticed molecular structure is formed, collosol and gel is formed by Al, Si and O atom interconnection.
As preferred, in processing method of the invention, need to have periodically using activated carbon by the oily waste degradation in electrolyte
Gymnastics conduct, the activated carbon of 10g/L is imported in electrolyte, is stirred 20 minutes, using filter by electrolyte filtering.Periodically inspection
The concentration of electrolyte is surveyed, electrolyte is compensated, reach concentration standard.
Embodiment one
Present embodiments provide a kind of surface treatment method of aluminium alloy engine cylinder lid, including the steps：
（1）Electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；
In electrolyte, sodium sulfate concentration is 15g/L, and oxidation zinc concentration is 3g/L, and sodium peroxide concentration is 3 g/L, 12
Alkyl sulfonic acid na concn is 2g/L, balance of water；Electrolytic current density is 1A/dm2, electrolysis time 5 minutes.
（2）Immersion operation：Cylinder head after electrolysis is put into protective liquid carries out immersion 30 seconds；
（3）Curing process：After cylinder head is lifted out, the colloidal sol for blowing cylinder head excess surface off using high pressure air rifle coagulates
Glue extension amount, and cylinder head is dried naturally, is solidified, make cylinder cap surface formed can prevent aluminium alloy from changing colour, it is mouldy saturating
Bright diaphragm, obtains the aluminium alloy cylinder lid with metallic luster.
Embodiment two
Present embodiments provide a kind of surface treatment method of aluminium alloy engine cylinder lid, including the steps：
（1）Electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；
In electrolyte, sodium sulfate concentration is 18g/L, and oxidation zinc concentration is 3.5g/L, and sodium peroxide concentration is 4g/L, 12
Alkyl sulfonic acid na concn is 1g/L, balance of water；Electrolytic current density is 2A/dm2, electrolysis time 4 minutes.
（2）Immersion operation：Cylinder head after electrolysis is put into protective liquid carries out immersion 30 seconds；
（3）Curing process：After cylinder head is lifted out, the colloidal sol for blowing cylinder head excess surface off using high pressure air rifle coagulates
Glue extension amount, and cylinder head is dried naturally, is solidified, make cylinder cap surface formed can prevent aluminium alloy from changing colour, it is mouldy saturating
Bright diaphragm, obtains the aluminium alloy cylinder lid with metallic luster.
The present invention is exemplarily described above.Obviously, the present invention is implemented and is not subject to the restrictions described above.
As long as employ the improvement of the various unsubstantialities that method of the present invention design and technical scheme are carried out；Or it is not improved, will
Above-mentioned design of the invention and technical scheme directly apply to other occasions, within protection scope of the present invention.
Claims (3)
1. engine cylinder cap surface treatment method, it is characterised in that including step：
(1) electrowinning process：In the electrolyte being arranged in electrolytic cell, cylinder head is electrolysed；
(2) operation is soaked：Cylinder head after electrolysis is put into protective liquid and is soaked；
(3) curing process：Cylinder head after immersion is solidified, cylinder cap surface is formed diaphragm；
In the electrolyte, sodium sulfate concentration is 15-20g/L, and oxidation zinc concentration is 2-5g/L, and sodium peroxide concentration is 3-4g/
L, dodecyl sodium sulfate concentration is 1-2g/L, balance of water.
2. engine cylinder cap surface treatment method according to claim 1, it is characterised in that in the electrowinning process,
Electrolysis time is 3-6 minutes.
3. engine cylinder cap surface treatment method according to claim 1, it is characterised in that the protective liquid is colloidal sol
Gel solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510641890.9A CN105239146B (en) | 2015-09-30 | 2015-09-30 | Engine cylinder cap surface treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510641890.9A CN105239146B (en) | 2015-09-30 | 2015-09-30 | Engine cylinder cap surface treatment method |
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| CN105239146A CN105239146A (en) | 2016-01-13 |
| CN105239146B true CN105239146B (en) | 2017-06-30 |
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| CN201510641890.9A Active CN105239146B (en) | 2015-09-30 | 2015-09-30 | Engine cylinder cap surface treatment method |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52108337A (en) * | 1976-03-08 | 1977-09-10 | Retoraza Ibaruguengoite Jiyuan | Method of improving chromium plated worn surface of cylinder or sleeve of internal combustion engine |
| DE102008011298A1 (en) * | 2007-03-16 | 2008-09-18 | Süddeutsche Aluminium Manufaktur GmbH | Partial pigmentation of a cover layer to avoid interference with aluminum components or aluminum-containing components |
| CN102677120B (en) * | 2011-03-09 | 2015-06-10 | 汉达精密电子(昆山)有限公司 | Hole sealing treatment method for aluminum and aluminum alloy anodized films |
| CN102206847A (en) * | 2011-05-07 | 2011-10-05 | 太原理工大学 | Microarc oxidation/sol-gel compound treatment process for magnesium alloy |
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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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