CN1038310A - Little chromium passivating technology of no nitrate radical and sulfate radical - Google Patents
Little chromium passivating technology of no nitrate radical and sulfate radical Download PDFInfo
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- CN1038310A CN1038310A CN 88103500 CN88103500A CN1038310A CN 1038310 A CN1038310 A CN 1038310A CN 88103500 CN88103500 CN 88103500 CN 88103500 A CN88103500 A CN 88103500A CN 1038310 A CN1038310 A CN 1038310A
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- Prior art keywords
- chromic acid
- grams per
- little
- radical
- inhibiter
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title abstract 2
- 229910052804 chromium Inorganic materials 0.000 title abstract 2
- 239000011651 chromium Substances 0.000 title abstract 2
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 title abstract 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract 2
- 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 2
- 238000002161 passivation Methods 0.000 abstract 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract 1
- 229910001297 Zn alloy Inorganic materials 0.000 abstract 1
- 239000003929 acidic solution Substances 0.000 abstract 1
- 239000012190 activator Substances 0.000 abstract 1
- 229910052793 cadmium Inorganic materials 0.000 abstract 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 235000011194 food seasoning agent Nutrition 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 239000011701 zinc Substances 0.000 abstract 1
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- Chemical Treatment Of Metals (AREA)
Abstract
The present invention is the little chromic acid passivation technology that does not contain nitrate radical, sulfate radical, is specially adapted to the surface passivation of zinc, zinc alloy and cadmium coater.It is by chromic acid, the acidic solution that soluble metal halogenide activator and inhibiter are formed.The passive film solidity to corrosion is good, the film of more existing little chromium passivating, and the salt-fog resistant test cycle life significantly increases.Seasoning need not dried, and is solution-stabilized, long service life.
Description
The present invention's the little chromic acid passivation novel process that does not contain nitrate radical, sulfate radical belongs to the conversion film field, is specially adapted to the surface passivation of zinc, zinc alloy and cadmium coater.
Chromating is to improve zinc, the main means that cadmium coater is decorated a protective for a long time, field of electroplating is being continued to use three acid (chromic acid, nitric acid, sulfuric acid) passivation pattern, typical high chromium passivating solution, chromic acid content reaches 250～300 grams per liters, not only waste chromium resource, and since pollution problem serious seventies, for reducing the pollution problem of chromate waste water, the many scientific and technical personnel of China's electroplating industry, reducing chromic acid concentration, realizing obtaining very great achievement from the research aspect of high chromium to low chromium concn transformation, many low chromic acid passivation technologies have obtained industrial application, typical low chromic acid passivation prescription is: chromic acid 5～6 grams per liters, 0.4 milliliter/liter in sulfuric acid, 3 milliliters/liter in nitric acid, potassium permanganate 0.1 grams per liter, nickelous nitrate 1 grams per liter.Developed little chromium passivating technology of chromic acid content lower (0.5～2 grams per liter) at present both at home and abroad, though chromic acid content significantly reduces, but still contain nitric acid and sulfuric acid, and the solidity to corrosion of passive film has been not ideal enough.
For this reason, we have studied new passivating dip, the present invention does not have little chromium passivating technology of nitrate radical, sulfate radical, be by chromic acid, the acidic solution that soluble metal halogenide activator and inhibiter are formed, its chromic acid content 1～2 grams per liter, soluble metal halogenide activator 1～45 grams per liter, inhibiter 0.2～1.0%(by volume), PH1.2～1.8, preferably processing range is chromic acid 1～1.75 grams per liter, soluble metal halogenide promoting agent 3～40 grams per liters, inhibiter 0.4～0.8%(is by volume), PH1.2～1.8.Soluble metal halogenide activator of the present invention is by formula M X
nForm with their mixture, n is 1～4 integer.
The present invention's passivating dip does not allow to introduce nitrate radical and sulfate ion, should not use the nitric acid bright dipping before the coating Passivation Treatment yet, otherwise, will influence passive film visual appearance and erosion resistance.
Passivation Treatment can be carried out in 18 °～55 ℃ scopes, for fresh coating surface, generally controlling solution temperature is 18 ℃～35 ℃, as form lazy attitude because of coating is detained in air, generally can improve passivating dip temperature to 35 ℃～55 ℃ or higher, all can obtain the passivation film of being satisfied with.
The Passivation Treatment time was generally 10～60 seconds, and Best Times is looked solution temperature and coating surface situation, was advisable can generate the passive film that requires.
The typical process method of this Passivation Treatment is that pending plating piece is dipped in the present invention's the passivating dip entirely, keeps contacting of coating surface and solution, and what other can keep that solution and coating surface well contact also can use as methods such as spray, pouring.
Advantage of the present invention is that passivating dip does not contain nitrate radical, sulfate radical, the chromatic passivation film solidity to corrosion that forms is good, the film of more existing little chromium passivating, the salt-fog resistant test cycle life significantly increases, seasoning after the passivation need not dried, and is solution-stabilized, long service life not only is suitable for the also suitable automation line production of manual operations.
Embodiment 1
With zinc-plated, cadmium plating product,, obtain the chromatic passivation film by following condition passivation
Chromic acid 1～1.75 grams per liter
Sodium-chlor 1～35 grams per liter
Inhibiter 0.3～0.6(by volume)
PH 1.2～1.8
The temperature room temperature
20 seconds time
Embodiment 2
With zinc-plated, cadmium plating product,, obtain the chromatic passivation film by following condition passivation
Chromic acid 1～1.75 grams per liter
Magnesium chloride 1～45 gram/magnesium
Inhibiter 0.4～0.8%(by volume)
PH 1.2～1.8
The temperature room temperature
20 seconds time
Embodiment 3
Zinc-plated, cadmium plating product are pressed following condition passivation, obtain the chromatic passivation film
Chromic acid 1～1.75 grams per liter
Aluminum chloride 1～40 grams per liter
Inhibiter 0.3～0.6%(by volume)
PH 1.2～1.8
The temperature room temperature
30 seconds time
Embodiment 4
With zinc-plated, cadmium plating, galvanized alloy product,, obtain the chromatic passivation film by following condition passivation
Chromic acid 1～1.75 grams per liter
Sodium-chlor+Repone K+magnesium chloride+aluminum chloride 1～40 grams per liter
Inhibiter 0.5～1%(by volume)
PH 1.2～1.8
The temperature room temperature
20～30 seconds time
Claims (3)
1, a kind of zinc that is applicable to, surperficial little chromic acid passivation technology of zinc alloy and cadmium coater, its principal character is by chromic acid, the acidic solution that soluble metal halogenide activator and inhibiter are formed, processing range is chromic acid 1～2 grams per liter, soluble metal halogenide activator 1～45 grams per liter, inhibiter 0.2～1.0% (by volume), PH1.2～1.8, do not contain nitrate radical and sulfate ion, keep this solution to contact a reasonable time, to generate desired chromatic passivation film with pending coating surface.
2, little chromic acid passivation technology according to claim 1 is characterized in that chromic acid 1～1.75 grams per liter of best processing range, soluble metal halogenide activator 3～40 grams per liters, inhibiter 0.4～0.8%(is by volume), PH1.2～1.8.
3, little chromic acid passivation technology according to claim 1 and 2 is characterized in that soluble metal halogenide activator, by formula M X
nExpression, n is 1～4 integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103500 CN1017727B (en) | 1988-06-06 | 1988-06-06 | Process of micro-chromium passivaion free from nitrate radical and sulfate radical |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103500 CN1017727B (en) | 1988-06-06 | 1988-06-06 | Process of micro-chromium passivaion free from nitrate radical and sulfate radical |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038310A true CN1038310A (en) | 1989-12-27 |
| CN1017727B CN1017727B (en) | 1992-08-05 |
Family
ID=4832625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88103500 Expired CN1017727B (en) | 1988-06-06 | 1988-06-06 | Process of micro-chromium passivaion free from nitrate radical and sulfate radical |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017727B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053932C (en) * | 1995-07-21 | 2000-06-28 | 中山中粤马口铁工业有限公司 | Low-chromium chemical passivation method on surface of tin-plated thin steel plate |
| CN101956190A (en) * | 2010-04-20 | 2011-01-26 | 山东建筑大学 | Preparation and passivation process of iridescent passivant agent for zinc coating |
| CN103741127A (en) * | 2013-11-28 | 2014-04-23 | 苏州长风航空电子有限公司 | Passivating solution and passivation method for zinc-nickel alloy plating |
-
1988
- 1988-06-06 CN CN 88103500 patent/CN1017727B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053932C (en) * | 1995-07-21 | 2000-06-28 | 中山中粤马口铁工业有限公司 | Low-chromium chemical passivation method on surface of tin-plated thin steel plate |
| CN101956190A (en) * | 2010-04-20 | 2011-01-26 | 山东建筑大学 | Preparation and passivation process of iridescent passivant agent for zinc coating |
| CN103741127A (en) * | 2013-11-28 | 2014-04-23 | 苏州长风航空电子有限公司 | Passivating solution and passivation method for zinc-nickel alloy plating |
| CN103741127B (en) * | 2013-11-28 | 2016-02-24 | 苏州长风航空电子有限公司 | A kind of zinc-nickel alloy coating passivating solution and passivating method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017727B (en) | 1992-08-05 |
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