CN104498932A - Surface treatment method for structural components of satellite navigation receiver - Google Patents
Surface treatment method for structural components of satellite navigation receiver Download PDFInfo
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- CN104498932A CN104498932A CN201410794123.7A CN201410794123A CN104498932A CN 104498932 A CN104498932 A CN 104498932A CN 201410794123 A CN201410794123 A CN 201410794123A CN 104498932 A CN104498932 A CN 104498932A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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Abstract
The invention relates to a surface treatment method for structural components of a satellite navigation receiver. The method comprises the following steps: performing pretreatment, performing ceramic oxidizing treatment, removing unnecessary ceramic oxidizing layer and performing conductive oxidation treatment, wherein the pretreatment step comprises the following four sub-steps: chemically deoiling, washing with warm water, performing chemical polishing and performing alkali etching, the prepared deoiling solution, polishing solution and alkali etch solution are respectively adopted for treatment, and ceramic oxidizing treatment is performed by adopting the prepared ceramic oxidizing solution; and the ceramic oxidizing layer on the surface of a part needing conducting is removed, and finally conductive oxidation treatment is performed by adopting the prepared conductive oxidation solution. The three-proofing capacity of a Beidou navigation product can be effectively enhanced, the reliability of the product is improved, and the service life of the product is prolonged. The water resistance, mildew resistance, salt spray resistance, wear resistance and high/low-temperature resistance of the structural components are greatly improved under the condition that the electrical property is met.
Description
Technical field
The present invention relates to a kind of surface treatment method of satellite navigation receiver structural part.
Background technology
Current Beidou navigation product, mostly adopt aluminum alloy materials processing structure part, because the intensity of aluminium alloy is high, lightweight, conduct electricity very well (can form good shielding cavity), and the radio circuit of navigation product requires big area, good earth, so Big Dipper product structure part (aluminum component) all adopts electric conductive oxidation to carry out surface treatment substantially.Adopt the structural part of electric conductive oxidation processing mode to reduce circuit output noise, electromagnetic shielding box body can be formed simultaneously, ensure the anti-electromagnetic interference capability of receiving apparatus.But it is thin and soft to adopt the structural member surface of this processing mode to protect rete, is easy to wearing and tearing, gets rusty, simultaneously high-low temperature resistant, salt fog poor-performing.Due to protective film " three prevent " poor-performing that electric conductive oxidation is formed, the service requirements of the military therefore can not be met in some cases.
General electric conductive oxidation process (AL/CtOcd) is immersed in specific solution by aluminum component (to be generally chromatedsolution); at the layer protecting film that aluminium workpiece surface is formed; this film can play certain protective effect; but wearing and tearing are easy to because rete matter is soft; so its NBC protective performance is not very excellent; the general aluminum component through electric conductive oxidation process, after high/low temperature and salt-fog test, all can produce some corrosions.
Although electric conductive oxidation surface treatment can not provide good barrier propterty, at present a kind of structural part can be made to have surface treatment method that fine electrical property has again fine NBC protective performance.Therefore, exploring a kind of new structural member surface treatment process is the problem that current Beidou navigation product needed is captured.
Summary of the invention
In view of prior art Problems existing and defect, the invention provides a kind of surface treatment method of satellite navigation receiver structural part.Receiver card structural part is adopted the process of ceramic oxidizing layer by the method, and then will need with circuit board contacts or need the surface of electromagnetic shielding to adopt electric conductive oxidation process, two kinds of surface treatment modes are acted on same part, although implement technics comparing complexity, there is certain difficulty, but " three prevent " ability strengthening Beidou navigation product is one of main task of current Big Dipper project, adopts the Beidou navigation product of this surface treatment mode still should belong to the first.
The present invention for achieving the above object, the technical scheme adopted is: a kind of surface treatment method of satellite navigation receiver structural part, it is characterized in that, the surface treatment of satellite navigation receiver structural part is carried out according to pre-treatment, ceramic oxidizing process, the step of removing unwanted ceramic oxidizing layer and electric conductive oxidation process, and concrete steps are as follows:
Step one. pre-treatment
This step is carried out according to following electrochemical deoiling-warm water washing-chemical bright dipping-caustic corrosion four step process process:
(1). electrochemical deoiling: prepare in proportion except oil solution with pure water and sodium phosphate, water glass and sodium laurylsulfonate: sodium phosphate concentration is 50 ~ 70g/L; Sodium silicate silicate 25 ~ 35g/L; Sodium laurylsulfonate concentration is 8 ~ 12g/L; 75 ~ 85 DEG C will be heated to except oil solution, then structural part be immersed in except in oil solution, keep 8 ~ 12min.
(2). warm water washing: with the clean structural member surface of purified rinse water of 35 DEG C ~ 60 DEG C except oil solution.
(3). chemical bright dipping: prepare bright dipping solution in proportion with pure water and nitric acid: concentration of nitric acid is 200 ~ 250mL/L; Structural part is immersed in bright dipping solution, becomes after light until structural member surface and take out.
(4). caustic corrosion: prepare caustic corrosion solution in proportion with pure water and sodium hydroxide and sodium carbonate: naoh concentration is 20 ~ 35g/L; Concentration of sodium carbonate is 20 ~ 30g/L; Caustic corrosion solution is heated to 50 ~ 60 DEG C, then structural part is immersed in caustic corrosion solution, keep 1 ~ 2min.
Step 2. ceramic oxidizing process
Ceramic oxidizing solution is prepared in proportion: titanium potassium oxalate(T.P.O.) concentration is 15 ~ 35g/L with pure water and titanium potassium oxalate(T.P.O.), boric acid, citric acid and oxalic acid; Boric acid concentration is 8 ~ 10g/L; Citric acid concentration is 11 ~ 13g/L; Concentration of oxalic acid is 2 ~ 4g/L; Be immersed in by structural part through pre-treatment in ceramic oxidizing solution, ceramic oxidizing solution temperature is 40 ~ 60 DEG C, and oxidization time is 10 ~ 20min, and oxidation voltage is 60 ~ 80V.
Step 3. remove unwanted ceramic oxidizing layer
With machining process milling except ceramic oxidizing layer structural part needing current-carrying part surface.
Step 4. electric conductive oxidation process
Electric conductive oxidation solution is prepared in proportion: phosphoric acid concentration is 20 ~ 24g/L with pure water and phosphoric acid, chromic trioxide, Sodium Fluoride and boric acid; Chromic trioxide concentration is 2 ~ 4g/L; Concentration of sodium fluoride is 4 ~ 6g/L; Boric acid concentration is 1.5 ~ 2.5g/L; Be immersed in electric conductive oxidation solution by the structural part removing part ceramic oxidizing layer, the temperature of electric conductive oxidation solution is room temperature, takes out after immersing 15 ~ 60s.
The invention has the beneficial effects as follows: adopt the present invention effectively can strengthen " three prevent " ability of Beidou navigation product, improve the reliability of product, extend the work-ing life of product.Under the prerequisite meeting electrical property by the waterproof of structural part, mildew-resistant, Defend salt fog, to resistance to wear and the performance such as high-low temperature resistant improves greatly.
Accompanying drawing explanation
Fig. 1 is the block schematic illustration that the present invention is applied to satellite navigation receiver.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment: with reference to Fig. 1, Fig. 1 is the block schematic illustration that the present invention is applied to satellite navigation receiver, A face on its middle frame and B face require to have good electroconductibility, A face and other structural part are well altogether and form shielding cavity, B face contacts with circuit board receiver, for circuit provide large-area altogether, as with reference to ground, reduce system noise.For meeting the electrical property of this navigation product, A, B two sides must be made to have electroconductibility, remaining surface does not need to have electroconductibility.
The framework surface treatment concrete steps of the satellite navigation receiver of the present embodiment are as follows:
Step one. pre-treatment: this step is carried out according to following electrochemical deoiling-warm water washing-chemical bright dipping-caustic corrosion four step process process:
(1). electrochemical deoiling: prepare in proportion except oil solution with pure water and sodium phosphate, water glass and sodium laurylsulfonate: sodium phosphate concentration is 60g/L; Sodium silicate silicate 30g/L; Sodium laurylsulfonate concentration is 10g/L; 80 DEG C will be heated to except oil solution, then framework junction part be immersed in except in oil solution, keep 10min; This step is the oil stain on cleaning framework junction part surface.
(2). warm water washing: with the clean framework junction part surface of the purified rinse waters of 50 DEG C except oil solution.
(3). chemical bright dipping: prepare bright dipping solution in proportion with pure water and nitric acid: concentration of nitric acid is 220mL/L; Framework junction part is immersed in bright dipping solution, takes out after framework junction part surface obviously becomes light; This step makes framework junction part surface-brightening, remove portion surface oxide layer.
(4). caustic corrosion: prepare caustic corrosion solution in proportion with pure water and sodium hydroxide and sodium carbonate: naoh concentration is 25g/L; Concentration of sodium carbonate is 25g/L; Caustic corrosion solution is heated to 55 DEG C, then framework junction part is immersed in caustic corrosion solution, keep 1min to take out.This step removes framework junction part surface oxide layer comprehensively.
Step 2. ceramic oxidizing process: prepare ceramic oxidizing solution in proportion with pure water and titanium potassium oxalate(T.P.O.), boric acid, citric acid and oxalic acid: titanium potassium oxalate(T.P.O.) concentration is 25g/L; Boric acid concentration is 9g/L; Citric acid concentration is 12g/L; Concentration of oxalic acid is 3g/L; Be immersed in by framework junction part through pre-treatment in ceramic oxidizing solution, ceramic oxidizing solution temperature is 50 DEG C, and oxidization time is 15min, and oxidation voltage is 70V.This step makes the outside surface of whole framework junction part form the equally bright and clean rete of the similar pottery of one deck, and hardness is very high, have the very excellent performance such as wear-resistant, anticorrosive, but the rete that ceramic oxidizing is formed does not possess electroconductibility.
Step 3. remove unwanted ceramic oxidizing layer: with machining process milling except ceramic oxidizing layer framework junction part needing current-carrying part (the A face in Fig. 1, B face) surface; Top layer (secondary processing) need be milled by machining center for baroque part, benchmark due to secondary processing is difficult to process completely the same with first time, easily cause morpheme size deviation, so general structure is complicated, need two or more surface-treated structural part, just ceramic oxidizing process is carried out when being processed as work in-process, and then continue all the other textural elements of processing, the impact that twice machining benchmark deviation causes can be reduced like this.
Step 4. electric conductive oxidation process: prepare electric conductive oxidation solution in proportion with pure water and phosphoric acid, chromic trioxide, Sodium Fluoride and boric acid: phosphoric acid concentration is 22g/L; Chromic trioxide concentration is 3g/L; Concentration of sodium fluoride is 5g/L; Boric acid concentration is 2g/L; Be immersed in electric conductive oxidation solution by the framework junction part removing part ceramic oxidizing layer (the A face in Fig. 1, B face), the temperature of electric conductive oxidation solution is room temperature, takes out after immersing 40s.Carry out the framework junction part after chemical oxidation, the surface in its A face and B face defines conductive oxide film, and other anodization for porcelain like film of framework junction part is not also destroyed.
After testing, the framework junction part after above-mentioned technical process process, A, B two sides electric conductive oxidation rete has good electroconductibility; Remaining surface is ceramic oxidizing rete, has excellent " three prevent " performance.This satellite-navigation product is owing to adopting above-mentioned surface treatment method, and its " three prevent " ability improves greatly, and the life-span also extends relatively, has very large advantage compared with adopting the Beidou navigation product of conventional junction component processing mode.
Claims (1)
1. the surface treatment method of a satellite navigation receiver structural part, it is characterized in that, the surface treatment of satellite navigation receiver structural part is carried out according to pre-treatment, ceramic oxidizing process, the step of removing unwanted ceramic oxidizing layer and electric conductive oxidation process, and concrete steps are as follows:
Step one. pre-treatment
This step is carried out according to following electrochemical deoiling-warm water washing-chemical bright dipping-caustic corrosion four step process process:
(1). electrochemical deoiling: prepare in proportion except oil solution with pure water and sodium phosphate, water glass and sodium laurylsulfonate: sodium phosphate concentration is 50 ~ 70g/L; Sodium silicate silicate 25 ~ 35g/L; Sodium laurylsulfonate concentration is 8 ~ 12g/L; 75 ~ 85 DEG C will be heated to except oil solution, then structural part be immersed in except in oil solution, keep 8 ~ 12min;
(2). warm water washing: with the clean structural member surface of purified rinse water of 35 DEG C ~ 60 DEG C except oil solution;
(3). chemical bright dipping: prepare bright dipping solution in proportion with pure water and nitric acid: concentration of nitric acid is 200 ~ 250mL/L; Structural part is immersed in bright dipping solution, becomes after light until structural member surface and take out;
(4). caustic corrosion: prepare caustic corrosion solution in proportion with pure water and sodium hydroxide and sodium carbonate: naoh concentration is 20 ~ 35g/L; Concentration of sodium carbonate is 20 ~ 30g/L; Caustic corrosion solution is heated to 50 ~ 60 DEG C, then structural part is immersed in caustic corrosion solution, keep 1 ~ 2min;
Step 2. ceramic oxidizing process
Ceramic oxidizing solution is prepared in proportion: titanium potassium oxalate(T.P.O.) concentration is 15 ~ 35g/L with pure water and titanium potassium oxalate(T.P.O.), boric acid, citric acid and oxalic acid; Boric acid concentration is 8 ~ 10g/L; Citric acid concentration is 11 ~ 13g/L; Concentration of oxalic acid is 2 ~ 4g/L; Be immersed in by structural part through pre-treatment in ceramic oxidizing solution, ceramic oxidizing solution temperature is 40 ~ 60 DEG C, and oxidization time is 10 ~ 20min, and oxidation voltage is 60 ~ 80V;
Step 3. remove unwanted ceramic oxidizing layer
With machining process milling except ceramic oxidizing layer structural part needing current-carrying part surface;
Step 4. electric conductive oxidation process
Electric conductive oxidation solution is prepared in proportion: phosphoric acid concentration is 20 ~ 24g/L with pure water and phosphoric acid, chromic trioxide, Sodium Fluoride and boric acid; Chromic trioxide concentration is 2 ~ 4g/L; Concentration of sodium fluoride is 4 ~ 6 g/L; Boric acid concentration is 1.5 ~ 2.5g/L; Be immersed in electric conductive oxidation solution by the structural part removing part ceramic oxidizing layer, the temperature of electric conductive oxidation solution is room temperature, takes out after immersing 15 ~ 60s.
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| WO2017161582A1 (en) * | 2016-03-25 | 2017-09-28 | 深圳市恒兆智科技有限公司 | Aluminum material filming agent, aluminum material, and surface filming processing method therefor |
| CN110230047A (en) * | 2019-06-21 | 2019-09-13 | 嘉丰工业科技（惠州）有限公司 | A kind of magnesium alloy preparation method of corrosion-resistant, highly conductive characteristic |
| CN114318316A (en) * | 2021-10-28 | 2022-04-12 | 中国航发西安动力控制科技有限公司 | Aluminum alloy colorless chemical oxidation treatment solution and process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017161582A1 (en) * | 2016-03-25 | 2017-09-28 | 深圳市恒兆智科技有限公司 | Aluminum material filming agent, aluminum material, and surface filming processing method therefor |
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| CN114318316A (en) * | 2021-10-28 | 2022-04-12 | 中国航发西安动力控制科技有限公司 | Aluminum alloy colorless chemical oxidation treatment solution and process |
| CN114318316B (en) * | 2021-10-28 | 2024-01-12 | 中国航发西安动力控制科技有限公司 | Colorless chemical oxidation treatment solution and process for aluminum alloy |
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