CN104278263A - Second passivation method - Google Patents
Second passivation method Download PDFInfo
- Publication number
- CN104278263A CN104278263A CN201310276762.XA CN201310276762A CN104278263A CN 104278263 A CN104278263 A CN 104278263A CN 201310276762 A CN201310276762 A CN 201310276762A CN 104278263 A CN104278263 A CN 104278263A
- Authority
- CN
- China
- Prior art keywords
- passivation
- metal
- secondary passivity
- metal workpiece
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
-
- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a second passivation method belonging to the field of metal plating and used for cleaning metal surface. The second passivation method includes the following steps: A. immersing a metal workpiece into a first passivation solution, soaking for 5-10 minutes at normal temperature or after heating to 50-60 DEG C until surface dirt is completely removed, and a uniform and compact passivation film is formed, when processing is complete, taking the metal workpiece out, and using clean water to clean the metal workpiece; and B. immersing the metal workpiece into a second passivation solution, soaking for 5-8 minutes at normal temperature or after heating to 55-65 DEG C, taking the metal workpiece out, and using water to wash; wherein the concentration of the second passivation solution is 30-40g / L, the first passivation solution comprises 250-300g / L of trivalent chromate and 10-20ml / L of sulfuric acid, and the second passivation solution comprises 30-40g / L of trivalent chromate. The beneficial effects of the second passivation method are that: the second passivation method is simple in operation, convenient in use, economic and practical, can prevent metal corrosion and hydrogen embrittlement phenomena, and is especially suitable for complicated metal workpieces.
Description
Technical field
The invention belongs to Metal plating field.
Background technology
In modern manufacturing industry, use metal products in a large number, on metal products, coating is also common production method.Passivation Treatment is a crucial processing step, its objective is the protection against corrosion in order to material.Because metal works is after pickling, water flushing, rinsing, metallic surface is very clean, activates very much, is easy to be corroded, so must carry out Passivation Treatment immediately, makes the metallic surface after cleaning generate protective membrane, slowing down corrosion.
Summary of the invention
The object of this invention is to provide a kind of method of secondary passivity, improve coating surface bright and attractive in appearance, generate the passive film of one deck dense structure at coating surface, increase coating rotproofness.
In order to achieve the above object, the technical solution used in the present invention is:
A method for secondary passivity, is characterized in that comprising the following steps:
A. metal works is immersed in a passivating solution, normal temperature or after being heated to 50 ~ 60 degree, soaks 5-10 minute, remove completely to surface smut, till forming the Passivation Treatment film of even compact, process rear taking-up, with clear water washing totally;
B. immersed by metal works in secondary passivity liquid, normal temperature or after being heated to 55 ~ 65 degree, soak 5-8 minute, take out washing, wherein the concentration of secondary passivity liquid is 30-40g/L.
In an above-described passivating solution, trivalent chromate 250 ~ 300g/L, sulfuric acid 10 ~ 20ml/L.
In above-described secondary passivity liquid, trivalent chromate 30 ~ 40g/L.
The invention has the beneficial effects as follows, simple to operate, easy to use, economical and practical, prevent metal from occurring excessive erosion and Hydrogen Brittleness Phenomena, be specially adapted to complicated metal works.
Accompanying drawing explanation
Fig. 1 is the present invention's deactivation slot structural representation used.
In figure: 1. a groove; 2. two grooves; 3. notch; 4. liquid level line; 5. substrate.
Embodiment
From accompanying drawing 1, the present invention adopts two 500L deactivation slots, and fixes on the substrate 5.Inject a groove 1 by after a passivating solution proportioning, inject secondary groove 2 by after secondary passivity liquid proportioning.Position near notch 3 on groove is provided with liquid level line 4, for limiting the extreme higher position of the passivating solution of injection.In the present invention's passivating solution, trivalent chromate 250 ~ 300g/L, sulfuric acid 10 ~ 20ml/L.In secondary passivity liquid, trivalent chromate 30 ~ 40g/L, wherein the concentration of secondary passivity liquid is 30-40g/L.
Embodiment 1:
Metal works is immersed in a groove 1, after a passivating solution is heated to 60 degree, soak 5 minutes, remove completely to surface smut, till forming the Passivation Treatment film of even compact, processed rear taking-up, immerse in secondary groove 2 after clean with clear water washing, use after being heated to 55 degree in secondary passivity liquid, soak 8 minutes, take out washing.
Embodiment 2:
Metal works is immersed in a groove 1, after a passivating solution is heated to 50 degree, soak 10 minutes, remove completely to surface smut, till forming the Passivation Treatment film of even compact, processed rear taking-up, immerse in secondary groove 2 after clean with clear water washing, use after being heated to 65 degree in secondary passivity liquid, soak 5 minutes, take out washing.
It should be noted that embodiment of the present invention is only its optimal way, to belonging to general idea of the present invention, and being only apparent change, all should belonging within protection scope of the present invention.
Claims (3)
1. a method for secondary passivity, is characterized in that comprising the following steps:
A. metal works is immersed in a passivating solution, normal temperature or after being heated to 50 ~ 60 degree, soaks 5-10 minute, remove completely to surface smut, till forming the Passivation Treatment film of even compact, process rear taking-up, with clear water washing totally;
B. immersed by metal works in secondary passivity liquid, normal temperature or after being heated to 55 ~ 65 degree, soak 5-8 minute, take out washing, wherein the concentration of secondary passivity liquid is 30-40g/L.
2. the method for secondary passivity according to claim 1, is characterized in that: in a described passivating solution, trivalent chromate 250 ~ 300g/L, sulfuric acid 10 ~ 20ml/L.
3. the method for secondary passivity according to claim 1, is characterized in that: in described secondary passivity liquid, trivalent chromate 30 ~ 40g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310276762.XA CN104278263A (en) | 2013-07-03 | 2013-07-03 | Second passivation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310276762.XA CN104278263A (en) | 2013-07-03 | 2013-07-03 | Second passivation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104278263A true CN104278263A (en) | 2015-01-14 |
Family
ID=52253595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310276762.XA Pending CN104278263A (en) | 2013-07-03 | 2013-07-03 | Second passivation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104278263A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088209A (en) * | 2015-09-11 | 2015-11-25 | 江苏振宇环保科技有限公司 | Preparation method of inky and brown chromate-free passivation solution |
| CN106884164A (en) * | 2015-12-16 | 2017-06-23 | 常熟宝升精冲材料有限公司 | A kind of strip deactivation slot and its passivating method for producing fine material |
-
2013
- 2013-07-03 CN CN201310276762.XA patent/CN104278263A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088209A (en) * | 2015-09-11 | 2015-11-25 | 江苏振宇环保科技有限公司 | Preparation method of inky and brown chromate-free passivation solution |
| CN105088209B (en) * | 2015-09-11 | 2017-06-30 | 南通亿能彩钢板有限公司 | A kind of preparation method of black brown chromium-free passivation liquid |
| CN106884164A (en) * | 2015-12-16 | 2017-06-23 | 常熟宝升精冲材料有限公司 | A kind of strip deactivation slot and its passivating method for producing fine material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150114 |