CN1062932A - Low-concentration normal-temp. chromium-plating additive and its application process - Google Patents
Low-concentration normal-temp. chromium-plating additive and its application process Download PDFInfo
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- CN1062932A CN1062932A CN 90106488 CN90106488A CN1062932A CN 1062932 A CN1062932 A CN 1062932A CN 90106488 CN90106488 CN 90106488 CN 90106488 A CN90106488 A CN 90106488A CN 1062932 A CN1062932 A CN 1062932A
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- Prior art keywords
- plating
- chromium
- additive
- chrome
- micropore
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- 238000007747 plating Methods 0.000 title claims abstract description 41
- 239000000654 additive Substances 0.000 title claims abstract description 30
- 230000000996 additive effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 28
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 46
- 239000011651 chromium Substances 0.000 claims abstract description 46
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 7
- 239000011734 sodium Substances 0.000 claims abstract description 7
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 5
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 229910052693 Europium Inorganic materials 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 3
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 239000011777 magnesium Substances 0.000 claims abstract description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 3
- 239000011591 potassium Substances 0.000 claims abstract description 3
- 239000010935 stainless steel Substances 0.000 claims abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 150000002148 esters Chemical class 0.000 claims description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 2
- 229910000978 Pb alloy Inorganic materials 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 238000002161 passivation Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011775 sodium fluoride Substances 0.000 claims description 2
- 235000013024 sodium fluoride Nutrition 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 229910000881 Cu alloy Inorganic materials 0.000 claims 1
- 239000006072 paste Substances 0.000 claims 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract description 24
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 abstract description 24
- 239000011248 coating agent Substances 0.000 abstract description 14
- 238000000576 coating method Methods 0.000 abstract description 14
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 abstract 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 239000011833 salt mixture Substances 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000008151 electrolyte solution Substances 0.000 description 15
- 238000009713 electroplating Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- RKLPWYXSIBFAJB-UHFFFAOYSA-N [Nd].[Pr] Chemical compound [Nd].[Pr] RKLPWYXSIBFAJB-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011696 chromium(III) sulphate Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- -1 gunmetal Chemical compound 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The chromium plating process in surface treatment technology is characterized by that the additive formed from oxide of europium, potassium, gadolinium, magnesium, neodymium, sodium and lanthanum and its salt mixture is added into chromic acid solution whose concentration is 100-200 g/l by 2-7 g/l, the temp. of electrolyte is above 25 deg.C, and the cathode current density is 5-15A/dm2The bright chromium or micropore chromium coating can be obtained under the process conditions, the deep plating capacity is good, and the deposition speed is high. It is suitable for plating protection on plastics, copper-tin alloy, nickel-iron alloy and stainless steel, namely decorative chromium and hard chromium plating and chromium rolling plating on iron, steel and steel alloy.
Description
What the present invention relates to is chrome-plated process in the process for treating surface.
The chromium plating technology has been the main component of electrolytic solution with chromic anhydride (being called chromic acid after water-soluble) since being applied to produce always.During chromium plating, chromic acid in breaking of a spot of sulfate radical (or other negatively charged ion) down, in 50 ℃ of left and right sides temperature, with the plating piece of every square decimeter of face apply 15-40 ampere direct current and bright coating.Chromic acid has very big toxicity, and it is very big to human body and physical environment harm, therefore, does not influence in the production under the condition of quality of coating, all wishes to use the electrolytic solution of low chromic acid concentration.Yet, the electrolytic solution covering power (covering power) of low chromic acid concentration is poor, the range of current that obtains bright coating is narrow, the bath voltage height, be unfavorable for producing in batches, application is restricted, height by chromic acid content in the electrolytic solution is divided into high, normal, basic chromic acid chrome-plated process traditionally, it is 250 grams per liters that the electrolytic solution of intermediate concentration contains chromic acid, it uses more common, usually claim the standard chrome-plated process again, in order to reduce the temperature and the current density of chromic acid content and deposit bright chromium layer in the electrolytic solution, domestic and international project technician adds fluorochemical usually in chromium plating solution, silicofluoride, the oxyhydroxide of fluoroborate and praseodymium neodymium is realized low chromic acid chrome-plated process, is a kind of additive for chrome-plating and the application art thereof of 87102034A as number of patent application, and the additive in these new adding electrolytic solution all contains fluorion, fluorine-containing acid group is big to the electroplating device corrosion, maintenance requirement height, its wastewater treatment also bother, and are unfavorable for popularizing.
Above-mentioned two types chrome-plated process; the crackle of the chromium coating that obtains is slightly concentrated; the electrochemically resistant corrosive nature is poor in actual use for it; the chromium crackle that corrosion current passes through slightly to concentrate is to the matrix metal longitudinal erosion; cause under the also intact situation of flawless place chromium layer the phenomenon that has the protected base metal of cracks but to get rusty.In decades, professional attempts to seek out the flawless chromium coating of light both at home and abroad, does not have the result so far.But it is found that under the same conditions tiny crack chromium and micropore chromium electrochemically resistant corrodibility improve greatly than standard technology chromium coating electrochemically resistant corrodibility, so people seek the electrochemically resistant corrosive nature that the method for electroplating crackle chromium is improved coating in succession.The method of the plating micropore chromium of taking both at home and abroad at present is: part has plated after the bright nickel, plates the nickel envelope of one deck light again.In the electrolytic solution of nickel envelope technology, add granularity requirements superfine non-conductive particle such as silicon fluoride, main at present by import, when producing, by stirring silicon oxide is dispersed in the electrolytic solution, allows it be deposited on piece surface, utilize the non-conductive property of silicon oxide with nickel, thereby make and to deposit chromium generation microporous type chromium coating above it, self-evident, whether the silicon oxide that nickel is sealed up distributes evenly is whether the micropore that decision produces is evenly distributed, i.e. the key of quality of coating, the thickness requirement that while nickel is sealed up electrodeposited chromium is also very tight, the chromium layer is thin excessively, and porosity does not reach requirement, and the chromium layer is blocked up, the bridging phenomenon that micropore deposits chromium more also makes number cells fall now, in a word, since complex process, the cost height, troublesome poeration, also difficult popularizing.
Purpose of the present invention just provides a kind of additive and application art thereof, chromic acid concentration in reaching the reduction plating chromic electrolyte, reduce temperature, improve current efficiency, cut down the consumption of energy, reduce and pollute, when raising the efficiency, it is good directly to obtain quality in plating chromic electrolyte, the corrosion stability height, the microporous type chromium coating that cost is low.
Lower concentration normal temperature plating (micropore) chrome additive provided by the invention, it is characterized in that forming main additive by the oxide compound or its esters of europium, potassium, gadolinium, magnesium, neodymium, sodium, lanthanum, do not contain any fluorochemical, the supplementary additive of forming by the salt of lanthanum, gadolinium, sodium and ester fat alcohol sodium sulfate and alkyl sodium sulfonate, drop in the plating chromic electrolyte according to technological specification (seeing attached list), can realize this technology.
According to above-mentioned technological specification, the chrome-plated process feature of using the additive of patent of the present invention is CrO
-2 4Concentration is the 100-200 grams per liter; CrO
-2 4: SO
-2 4=100: 1; The principal mode 2-7 grams per liter of this additive, auxilliary type 0.01-0.02 grams per liter.Processing condition be electrolyte temperature on 25 ℃ all can, the close main 5-15 peace/square decimeter of cathodic current.Anode is formed: lead or lead alloy; Ratio of cathodic to anodic area: the moon: sun=1: 2-3, need not exhausting or add F-53 foam inhibiting fog agent, (comprise standard technology and novel process) in recent years anion-content (as sulfate radical) does not lie in many because whole plating chromic electrolyte, and whether the ratio of looking negatively charged ion and chromic acid is suitable, in recent years, the chromic acid of low chromic acid chrome-plated process and sulfate radical ratio are less than standard technology, it is converted to when hanging down the chromic acid chrome-plated process standard technology, at first must reduce sulfate radical, and the time of accurately reducing the sulfate radical needs is longer, cause the conversion process process time-consuming, influence is produced.The ratio of chromic acid and sulfate radical is in full accord with the standard chrome-plated process in the electrolytic solution of the present invention, i.e. CrO
-2
4: SO
-2
4=100: 1, thus during the electrolytic solution conversion cost technology of standard technology, only need concentration with clear water dilution chromic acid after, drop into additive of the present invention again, need not to adjust sulfate radical, it helps chemical examination and customary use and popularizes on a large scale.
Suitability of the present invention is wide, every traditional technology can be carried out, this technology can adapt to equally, when plating general chromium layer, main additive add-on is 2 grams per liters, and when plating micropore chromium, main additive add-on is the 5-7 grams per liter, use the present invention, can plate hard chrome plating on protection-decorative chromium and iron, steel, the steel alloy on copper, gunmetal, nickel, Rhometal and the stainless steel.In electrolytic solution of the present invention, add 5-20 grams per liter Sodium Fluoride, just can use chromium plating on barrel plating chromium and the passivation gunmetal bar after luminous, when traditional technology is carried out barrel plating chromium, because current efficiency is low, the earth stream penetrates the drum difficulty and difficult chromium plating, simultaneously, the electrolyte temperature height makes the plastics drum easily and moulds the groove damage, can not electroplate on a large scale always, and process current efficient height of the present invention, electrolyte temperature is low, can give full play to its advantage.In like manner, the present invention is used for the distortion that the electroplating plastic part can reduce part.
Additive provided by the invention and application art thereof, reach and reduce chromic acid concentration 40%(relative standard chrome-plated process in the plating chromic electrolyte), reduce about 20 ℃ of temperature, improve current efficiency 100%, the consumption that cuts down the consumption of energy (is calculated with electric energy, annual economize on electricity 15,000 degree of plating chromic electrolyte per ton), alleviate the pollution of chromic acid to environment, when improving workman's operating environment and increasing economic efficiency (seeing Table two), can directly in plating chromic electrolyte, obtain the microporous type chromium coating, after tested, every square centimeter of porosity reaches more than 120,000, the blue bright and cold and cheerless light of micropore chromium layer color not only has excellent decoration, and its corrosion stability all has raising greatly than the coating of standard chrome-plated process and other low concentration chromium plating process; The more existing micropore chromium process of cost significantly reduces (30-40% that has only it), and is easy to implement, and need not increase nickel plating envelope technology, sedimentation velocity is fast, per minute is 0.2 micron after tested, is the twice of standard chrome-plated process, and covering power good (seeing Table three) binding force of cladding material is good, because a large amount of micropore, coating stress has disperseed, and simultaneously, electrolytic solution can produce foam, suppress the volatilization of chromium mist, be of value to staff's health.
Enforcement of the present invention is fairly simple, during new electrolyte, chromic acid adds by 130 grams per liters, and sulfuric acid is that 1.3 grams per liters add, and the main additive of electroplating general chromium layer adds by 2 grams per liter amounts, when electroplating micropore chromium, main additive adds by 7 grams per liter amounts, and supplementary additive is dissolved in the hot water with 0.02 grams per liter amount, adds then in the electrolytic solution, a little stirring, energising can be produced.
When standard technology was converted to novel process of the present invention, at first the used for electrolyte clear water of standard technology being diluted to chromic acid content was the 150-160 grams per liter, and chromic acid content is higher than new electrolyte and considers that mainly electrolytic solution contains Fe
+ 3, Cu
+ 2Deng metallic impurity, make effective chromic acid concentration less than chemical examination concentration, adding main and auxiliary additive then can produce.
Claims (5)
1, a kind of additive of lower concentration normal temperature plating (micropore) chromium, it is characterized in that forming main additive the supplementary additive of forming by the salt of lanthanum, gadolinium, sodium and ester fat alcohol sodium sulfate and alkyl sodium sulfonate by the oxide compound or its esters of europium, potassium, gadolinium, magnesium, neodymium, sodium, lanthanum.
2, a kind of chrome-plated process of lower concentration normal temperature plating (micropore) chrome additive according to claim 1, it is characterized in that: CrO42-concentration is the 100-200 grams per liter, CrO42-: SO42-=100: 1, the principal mode of this additive is the 2-7 grams per liter, auxilliary type is the 0.01-0.02 grams per liter; Processing condition are: electrolyte temperature is more than 25 ℃, cathode current density 5-15 peace/square decimeter; Anode is formed: lead or lead alloy, ratio of cathodic to anodic area: the moon: sun=1: 2-3; Need not exhausting or interpolation F-53 foam inhibiting fog agent.
3, the chrome-plated process of lower concentration normal temperature according to claim 2 plating (micropore) chrome additive is characterized in that main additive add-on is 2 grams per liters when the general chromium layer of plating, and when plating micropore chromium, main additive add-on is the 5-7 grams per liter.
4, the chrome-plated process of lower concentration normal temperature plating (micropore) chrome additive according to claim 3 is characterized in that being used for plating on plastic paste, copper, copper alloy, nickel, Rhometal and the stainless steel hard chrome plating on protection-decorative chromium and iron, steel, the Steel Alloy.
5, the chrome-plated process of lower concentration normal temperature according to claim 3 plating (micropore) chrome additive, the Sodium Fluoride that it is characterized in that adding the 5-20 grams per liter in the described additive of claim 1 can be used chromium plating on barrel plating chromium and the passivation gunmetal bar after luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106488 CN1062932A (en) | 1990-12-29 | 1990-12-29 | Low-concentration normal-temp. chromium-plating additive and its application process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106488 CN1062932A (en) | 1990-12-29 | 1990-12-29 | Low-concentration normal-temp. chromium-plating additive and its application process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1062932A true CN1062932A (en) | 1992-07-22 |
Family
ID=4880127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106488 Pending CN1062932A (en) | 1990-12-29 | 1990-12-29 | Low-concentration normal-temp. chromium-plating additive and its application process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1062932A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510096A (en) * | 2012-06-20 | 2014-01-15 | 江苏华宇印涂设备集团有限公司 | Oil transmission roller |
| CN103943382A (en) * | 2014-04-25 | 2014-07-23 | 东北大学 | Method for manufacturing CuCr electrical contact materials through copper surface electrolytic chrome in sintering mode |
-
1990
- 1990-12-29 CN CN 90106488 patent/CN1062932A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510096A (en) * | 2012-06-20 | 2014-01-15 | 江苏华宇印涂设备集团有限公司 | Oil transmission roller |
| CN103943382A (en) * | 2014-04-25 | 2014-07-23 | 东北大学 | Method for manufacturing CuCr electrical contact materials through copper surface electrolytic chrome in sintering mode |
| CN103943382B (en) * | 2014-04-25 | 2016-04-06 | 东北大学 | A kind of copper surface electrolysis chromium sintering prepares the method for CuCr electrical contact material |
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