CN101767269A - Processing method for liquid-cooling anti-corrosion radiator - Google Patents
Processing method for liquid-cooling anti-corrosion radiator Download PDFInfo
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- CN101767269A CN101767269A CN200910311960A CN200910311960A CN101767269A CN 101767269 A CN101767269 A CN 101767269A CN 200910311960 A CN200910311960 A CN 200910311960A CN 200910311960 A CN200910311960 A CN 200910311960A CN 101767269 A CN101767269 A CN 101767269A
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Abstract
The invention provides a processing method for a liquid-cooling anti-corrosion radiator, aiming at solving the problems that a cooling channel of the liquid-cooling radiator in the prior art is difficult to carry out complete anti-corrosion treatment and the anti-corrosion effect is poor. A radiating rib upper part used for being oppositely connected with a radiating rib lower part at the inner side of a radiator main body is processed at the inner side of a cover plate; a rigid anodic oxidation treatment process is adopted to carry out anti-corrosion treatment, then welding surfaces are preprocessed in a unified manner, and finally the radiator main body and the cover plate are welded together in a vacuum manner to realize complete anti-corrosion of the cooling channel of the liquid-cooling radiator. The liquid-cooling radiator in the invention has the characteristics of strong corrosion resisting property, simple manufacturing process, easy operation and low production cost.
Description
Technical field
The present invention relates to a kind of radiator anti-corrosive treatment method, be specifically related to a kind of processing method of liquid-cooling anti-corrosion radiator.
Background technology
The principle of liquid cooling heat radiator is that the heat that heater element produces is conducted on the liquid cooling heat radiator by chill bar, takes heat to the radiator outside by the turnover radiator coolant, reaches the purpose that allows device dispel the heat.Common liquid cooling heat radiator all comprises radiator body and cover plate, generally is radiator body and cover plate are welded the liquid cooling heat radiator that formation has airtight cavity.On radiator body, be provided with suitable radiated rib and make it as far as possible sufficient heat exchange to reach better radiating effect.
During use, the inner cooling fluid of filling of liquid cooling heat radiator, cooling fluid is all dissolved some metal ions generally speaking, and these metal ions can produce corrosiveness to the surface, inside of radiator.If dress ornament long-term existence, might make the inwall of radiator destroy fully, cause cooling fluid to be revealed, can pollute, damage the heat radiation object, especially for electronic device, not only do not reach good stable radiating effect, also can cause problems such as electric leakage, short circuit, cause mortal injury to electronic device.Solve metal ion to the radiator internal corrosion, a best way is exactly to apply the corrosion resistant coating of one deck on the inwall of radiator.Usually apply corrosion resistant coating by the mode of electroplating, yet directly on technology, can't realize at electroplated coating on the radiator inwall; If respectively radiator body spare and cover plate are carried out electroplating processes, according to existing structure and processing mode, then problems such as coating shedding, coating performance variation also appear in complicated operation unavoidably in the process of last welding fabrication, make not reach the anticorrosion ability of expectation.At present, a kind of reasonable coating is a hard anodizing horizon, but for above-mentioned reasons, the hard anodizing treatment process is not being applied aspect the radiator inwall anti-corrosion treatment.Therefore, must seek other approach applies corrosion-resistant finishes and realizes the anti-corrosion treatment of liquid cooling heat radiator cooling duct on the inwall of radiator.
Summary of the invention
The invention provides a kind of processing method of liquid-cooling anti-corrosion radiator, mainly solved the problem that liquid cooling heat radiator cooling duct in the prior art is difficult to carry out complete anti-corrosion treatment and anticorrosion ability difference.
Technical solution of the present invention is as follows:
The processing method of this anti-corrosion radiator may further comprise the steps:
1) processing heat radiator: radiator comprises radiator body and cover plate, and establishing perpendicular to the base direction is short transverse; Described radiator body comprises base and first rib groups that is arranged on the base, and the radiator body height is A, and substructure height is a1, and the first rib groups height is a2, A=a1+a2; Described cover plate comprises top cover and second rib groups that is arranged on the top cover, and establishing the cover plate height is B, and cap height is b1, and the second rib groups height is b2, B=b1+b2; Described first rib groups is corresponding with the second rib groups position;
2) apply corrosion-resistant finishes: at the surface of radiator body and the surface-coated corrosion-resistant finishes of cover plate;
3) milling docking site coating: the corrosion-resistant finishes of removing first rib groups and the second rib groups docking location surface;
4) radiator welding fabrication: first rib groups and the second rib groups docking location surface are welded, and form the radiator internal cavity; If the height of radiator internal cavity is H, H=a2+b2.
Above-mentioned coating corrosion-resistant finishes specifically adopts the hard anodizing treatment process.
Above-mentioned hard anodizing is handled and is adopted sulfuric acid hard anodizing direct current method; Electrolyte is that concentration is 15%～25% sulfuric acid electrolyte, and in the electrolytic process, beginning voltage is 8～12V, and final voltage is decided according to the thickness and the material of rete; The beginning current density is 0.5A/dm
2, in 25 minutes, divide progressively to be elevated to 2.5A/dm 5～8 times
2, keep current density 2.5A/dm later on
2Before carrying out hard anodizing, adopt ultrasonic wave oil removing and cleaning; Electrolyte carries out electrolysis in the hard anode oxidation process under the temperature about-10 ℃～+ 5 ℃.
Above-mentionedly be welded as vacuum welding.
Above-mentioned vent rib is strip or tubulose rib.
The material of above-mentioned radiator body and cover plate is rustproof aluminum alloy or wrought aluminium.The processing method of above-mentioned liquid-cooling anti-corrosion radiator is characterized in that: plain milling technology is adopted in described milling.
The present invention compares with prior art, has following advantage:
1, realized the complete anti-corrosion treatment of radiator internal cooling channel;
2, corrosion resistance is strong;
3, operation is simple, and operation is easily gone.
4, the technology cost is low.
Description of drawings
Fig. 1 is common radiator internal structure schematic diagram;
Fig. 2 is radiator body of the present invention and cover plate schematic diagram;
Fig. 3 is for applying the schematic diagram of erosion shield among the present invention;
Fig. 4 mills for the present invention or the schematic diagram of line cutting coating result;
Fig. 5 is the liquid cooling heat radiator schematic diagram of welding fabrication of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in detail, as Fig. 1, liquid cooling heat radiator of the prior art, comprise radiator body and common cover, the radiator body inboard is processed with radiated rib, and do not process radiated rib on the common cover, often pass through welding or the bonding liquid cooling heat radiator that forms integral body between common cover and the radiator body.When needs carry out anti-corrosion treatment, often can only apply erosion shield to common cover and radiator body respectively, yet in process with cover plate and radiator body welding, will inevitably near the coating the solder side be damaged, cause coating covering liquid cold heat sink inwall fully, thereby do not reach good anticorrosion ability.
For solving common radiator is difficult to apply fully erosion shield on radiator inwall technical difficulty, the invention provides a kind of new thinking, cover plate has been made new design.As Fig. 2, the radiator body inboard processes the first vent rib group, process the second vent rib group that is used to dock the first vent rib group in the cover plate inboard, obviously, the second vent rib group that so processes should be consistent at the arranged evenly of radiator body inboard with the first vent rib group at the arranged evenly of cover plate inboard.And structure of cover plate and radiator body structure are also basic identical, even consider easy to processly, can make identical structure.In a word, should guarantee vent rib top and vent rib bottom after welding process in can dock exactly.
Then, as Fig. 3, apply erosion shield fully at radiator body and lid surface.At present, the hard anodizing treatment process is comparatively ripe, and because the resistant to elevated temperatures characteristics of hard anodizing corrosion-resistant finishes, in welding process, the hard anodizing coating can not melted, so the concrete mode of electroplating the hard anodizing coating that adopts is done anti-corrosion treatment.
Main treatment step is as follows:
(1) at first open cooling system, electrolyte temperature is reduced in the temperature range of technology defined, negative electrode is hung stereotype, the part that dress is hung up properly is placed on the anode conducting thick stick and tightens then, between part and the part, must keep bigger distance between part and the negative electrode, definitely can not contact.Open compressed air electrolyte and stir (note: compressed air must carry out oil removal treatment).
(2) send with dc source, the current density of beginning is generally 0.5A/dm
2, in 25 minutes, divide progressively to be elevated to 2.5 A/dm 5～8 times
2Keep current density 2.5A/dm later on
2, all every 5 minutes, it is 8～12V that the investigation primary current begins voltage, final voltage can be decided according to the thickness of rete is different with material.
(3) in hard anode oxidation process, must often note the voltage and current table, there is electric current to increase suddenly as finding, the phenomenon that voltage descends, dissolve this explanation part rete part, and the part of dissolving is checked and taken out to powered-down immediately, other part can be proceeded oxidation processes, and electric current can once be given enough.
Oxide-film is along with increase, the electric current of conduction time increase and thicken, and meanwhile, because chemical property (Al2O3) has duality, promptly it is basic anhydride in acid solution, is acidic oxide in alkaline solution.Oxide-film liquid dissolves in sulfuric acid solution undoubtedly, has only the dissolution velocity of the formation speed of oxide-film greater than it, and oxide-film just might thicken, and when dissolution velocity equated with formation speed, oxide-film no longer thickened.When oxidation rate during too greater than dissolution velocity, aluminium and articles made of aluminium alloy surface easily generate the oxide-film of band powdery.
The electrolysis under the temperature about-10 ℃～+ 5 ℃ of the electrolyte of hard anodizing.Because the oxidation film layer that hard anodizing generated has higher resistance, can directly have influence on the oxidation of current strength.In order to obtain thicker oxide-film, external voltage certainly will will be increased, its objective is in order to eliminate the big influence of resistance, and make current density keep certain, but electric current can produce fierce heating phenomenon when big, adds when generating oxide-film and can emit a large amount of heats, make part around electrolyte temperature acutely rise, temperature rise will the accelerated oxidation film dissolving, make the oxide-film can't thickening.In addition, the heating phenomenon is the most serious in the contact position of rete and metal, and as untimely solution, the local surfaces of processing parts meeting Yin Wendu rises and burnt out.
Solution adopts cooling device and stirring to combine exactly.Cooling device is lowered the temperature electrolyte by force, and stirring is in order to make whole groove electrolyte temperature even, to be beneficial to obtain the hard anodic oxidation coating of better quality.
Can generate the hardening oxidation rete of high-quality on aluminium and the aluminum alloy surface, depend primarily on the components and concentration of electrolyte, temperature, current density, and raw-material composition.
When adopting sulfuric acid electrolyte to carry out hard anodizing, generally in 10%～30% concentration range, it is 15%～25% sulfuric acid electrolyte that the present invention selects concentration.This mainly considers, when concentration is hanged down, and oxide-film hardness height, particularly fine aluminium is apparent in view, but the aluminium alloy higher to copper content (LY12) exception.Because the higher aluminium alloy of copper content easily generates the compound of CuO, this compound dissolution velocity when oxidation is very fast, very easily burns the aluminium part.So generally be not suitable for the sulfuric acid electrolyte with low concentration, must (H2SO4 carries out oxidation processes or adopts the alterating and direct current addition method to handle in 300～400g/L) in high concentration.
Electrolyte temperature is very big to the wearability influence of oxide-film, in general, if temperature descends, the anode oxide film anti-wear performance of aluminium and aluminium alloy just increases so, this is owing to the dissolution velocity decline of electrolyte for film causes, in order to obtain the oxide-film of higher hardness.Do we exist at the GPRS temperature? carrying out hard anodizing in ℃ scope is treated to.
In order to obtain quality horniness anode oxide film preferably, and can guarantee the required size of part, must be noted that sport technique segments such as acute angle rounding, the surplus that guarantees surface smoothness, accessory size, special fixture:
Part to be processed does not allow acute angle, burr and other various sharp-pointed places that corner angle are arranged because of hardening oxidation, and general anodizing time all is very long, and oxidizing process itself is exactly an exothermic reaction.Not only because so the place of general part corner angle often but also be the easiest hot-spot that causes part in these positions, position that electric current is comparatively concentrated, is burnt part.Therefore aluminium and all corner angle of aluminium alloy all should carry out chamfered, and chamfering y radius of circle should be less than 0.5 millimeter.
Behind the hard anodizing, the fineness of piece surface changes to some extent, for more coarse surface, after handling, this can seem than original more smooth, and for the higher part of original fineness, after often passing through this kind processing, any surface finish brightness of demonstration decreases on the contrary, and the amplitude of reduction is about 1～2 grade.
Higher because of the thickness of hard anodic oxidation coating, so the part as needing the aluminium part of further processing or needing later on to assemble should leave certain allowance in advance, reach appointment clamping position.During because of hard anodizing, change accessory size, thus when machining, predict in advance, the possible thickness and the dimensional tolerance of oxide-film, the part actual size before determining anodic oxidation then, so that after handling, the margin of tolerance up to specification.In general, the size of part increase is roughly about half that generates oxide thickness.
Because of the part of hard anodizing in oxidizing process, bear very high voltage and higher electric current, must make anchor clamps and part can keep utmost point excellent contact, otherwise will puncture or the defect of burn part contact site because of loose contact cause.So require difform part, and the specific requirement after the part oxidation designs and makes special fixture.
As Fig. 4, radiator body and cover plate after the hard anodizing processing are welded preliminary treatment, it is the corrosion resistant coating that the first vent rib group and the second vent rib group docking location are removed in the cutting of milling or line, radiator body and cover plate are exposed in order to the liquid cooling heat radiator two ends of soldering and the aluminium alloy body of radiated rib, specifically can adopt plain milling technology to guarantee the smooth of welding end surface, be beneficial to seamless vacuum welding.Finally, handle the liquid cooling heat radiator that obtains moulding as shown in Figure 5 through further processing.
This liquid cooling heat radiator can be applicable to the occasion that much needs efficiently radiates heat for a long time, especially in the heat radiation to the less electronic component of volume, is installed on and has guaranteed radiating effect and circuit safety on the corresponding heat conductive pad well.
Claims (8)
1. the processing method of an anti-corrosion radiator, its special character is, may further comprise the steps:
1) processing heat radiator: radiator comprises radiator body and cover plate, and establishing perpendicular to the base direction is short transverse; Described radiator body comprises base and first rib groups that is arranged on the base, and the radiator body height is A, and substructure height is a1, and the first rib groups height is a2, A=a1+a2; Described cover plate comprises top cover and second rib groups that is arranged on the top cover, and establishing the cover plate height is B, and cap height is b1, and the second rib groups height is b2, B=b1+b2; Described first rib groups is corresponding with the second rib groups position;
2) apply corrosion-resistant finishes: at the surface of radiator body and the surface-coated corrosion-resistant finishes of cover plate;
3) milling docking site coating: the corrosion-resistant finishes of removing first rib groups and the second rib groups docking location surface;
4) radiator welding fabrication: first rib groups and the second rib groups docking location surface are welded, and form the radiator internal cavity; If the height of radiator internal cavity is H, H=a2+b2.
2. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 1 is characterized in that: described coating corrosion-resistant finishes employing hard anodizing treatment process.
3. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 2 is characterized in that: described hard anodizing processing employing sulfuric acid hard anodizing direct current method; Electrolyte is that concentration is 15%～25% sulfuric acid electrolyte, and in the electrolytic process, beginning voltage is 8～12V, and final voltage is decided according to the thickness and the material of rete; The beginning current density is 0.5A/dm2, divides progressively to be elevated to 2.5A/dm2 5～8 times in 25 minutes, keeps current density 2.5A/dm2 later on.
4. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 3 is characterized in that: adopt ultrasonic wave oil removing and cleaning before carrying out hard anodizing; Electrolyte carries out electrolysis in the hard anode oxidation process under the temperature about-10 ℃～+ 5 ℃.
5. as the processing method of the arbitrary described liquid-cooling anti-corrosion radiator of claim 2 to 4, it is characterized in that: describedly be welded as vacuum welding.
6. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 5, it is characterized in that: described vent rib is strip or tubulose rib.
7. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 6, it is characterized in that: the material of described radiator body and cover plate is rustproof aluminum alloy or wrought aluminium.
8. the processing method of liquid-cooling anti-corrosion radiator as claimed in claim 7 is characterized in that: described milling employing plain milling technology.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950297A (en) * | 2012-12-06 | 2013-03-06 | 无锡博华机电有限公司 | Cooling and circulating passage of electric main shaft |
| CN104152966A (en) * | 2013-12-10 | 2014-11-19 | 贵州黎阳航空动力有限公司 | Method for determining minimum ablation rounded corner radius of component |
| CN104455025A (en) * | 2014-12-19 | 2015-03-25 | 苏州市吴中区郭巷旭宇羊毛衫加工场 | Cooling structure of bearing bush base |
| CN104711652A (en) * | 2013-12-11 | 2015-06-17 | 贵州红林机械有限公司 | High-hardness hard anodization technology for processing hard aluminum alloy |
| CN113897650A (en) * | 2021-10-21 | 2022-01-07 | 中国电子科技集团公司第五十四研究所 | Passivation method for aluminum alloy micro-channel radiator inner surface flow channel |
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2009
- 2009-12-22 CN CN2009103119609A patent/CN101767269B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950297A (en) * | 2012-12-06 | 2013-03-06 | 无锡博华机电有限公司 | Cooling and circulating passage of electric main shaft |
| CN104152966A (en) * | 2013-12-10 | 2014-11-19 | 贵州黎阳航空动力有限公司 | Method for determining minimum ablation rounded corner radius of component |
| CN104711652A (en) * | 2013-12-11 | 2015-06-17 | 贵州红林机械有限公司 | High-hardness hard anodization technology for processing hard aluminum alloy |
| CN104455025A (en) * | 2014-12-19 | 2015-03-25 | 苏州市吴中区郭巷旭宇羊毛衫加工场 | Cooling structure of bearing bush base |
| CN113897650A (en) * | 2021-10-21 | 2022-01-07 | 中国电子科技集团公司第五十四研究所 | Passivation method for aluminum alloy micro-channel radiator inner surface flow channel |
| CN113897650B (en) * | 2021-10-21 | 2022-12-27 | 中国电子科技集团公司第五十四研究所 | Passivation method for aluminum alloy micro-channel radiator inner surface flow channel |
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| CN101767269B (en) | 2011-07-20 |
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