CN110438533A - Prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap - Google Patents
Prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap Download PDFInfo
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- CN110438533A CN110438533A CN201910755204.9A CN201910755204A CN110438533A CN 110438533 A CN110438533 A CN 110438533A CN 201910755204 A CN201910755204 A CN 201910755204A CN 110438533 A CN110438533 A CN 110438533A
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- Prior art keywords
- gap
- ultrasonic cleaning
- zinc
- concentration
- soldering
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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
- C23C22/24—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 containing hexavalent chromium compounds
- C23C22/26—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 containing hexavalent chromium compounds containing also organic compounds
- C23C22/27—Acids
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
Abstract
The invention discloses a kind of electrogalvanizing methods of zinc coating blackening at soldering part gap prevented with gap, improve product electroplating quality.Zinc coating can corrode simultaneously blackening since corrosive medium remaining in gap returns infiltration at soldering part gap with gap, influence the presentation quality and corrosion resistance of part.The present invention simplifies electrogalvanizing process, and the corrosive deposit that part is contacted in plating is preferably minimized.Simultaneously, utilize the superpower cleaning effect of high-frequency ultrasonic (80KHz), high-frequency ultrasonic cleaning is reasonably added in galvanizing technique process, corrosive medium remaining in gap is cleaned out, in case zinc coating corrodes simultaneously blackening caused by part returns infiltration because of corrosive medium remaining in gap.
Description
Technical field
The galvanizing technique method of the present invention relates to a kind of carbon steel soldering part with gap belongs to electroplating technology technology neck
It domain can be effective by the electrogalvanizing part that this method is processed particular for single-sided welding and the apertured part of back of weld
Prevent phenomena such as zinc coating peeling, blackening occur at gap.
Background technique
Carbon steel material part, to guarantee part corrosion resistance, needs to be plated in part whole surface after welding processing
Zinc processing, for single-sided welding part, there are micro gap structures for back of weld and inside.Since zinc is amphoteric metal, with acid
Or corrosion reaction all easily occurs for alkali, currently, being often used many strong acid or strong basicity corrosive deposit in zinc-plated processing, such as alkalinity plating
Zinc-plated tank liquor uses sodium hydroxide strong basicity corrosive deposit in zinc, and passivation tank liquor uses the highly acids corrosive deposits such as chromic anhydride, nitric acid,
In part galvanizing process, these corrosive deposits penetrate into the micro gap structure of part back of weld and inside, these corrosion
Substance easily returns plating zinc layers after plating, and zinc coating at this is caused to corrode and black, and causes protective layer at this to fail, and influence part
Presentation quality after plating.
Summary of the invention
In order to meet appearance and corrosion resisting property requirement of the soldering part with gap to zinc coating, the present invention is intended to provide one
Kind can prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap, improve band gap soldering part zinc coating
Presentation quality and corrosion resistance.
The present invention is achieved by following technical solution:
The electrogalvanizing method of zinc coating blackening at the soldering part gap with gap is prevented, including,
Electrochemical degreasing and ultrasonic cleaning before part is zinc-plated, and electrochemical degreasing and ultrasonic cleaning carry out simultaneously；
Ultrasonic cleaning after part is zinc-plated first carries out ultrasonic cleaning, is then dried after part is zinc-plated, do
Part is passivated again after the completion of dry, ultrasonic cleaning and drying are carried out to part again after passivation.
Further, the ultrasonic frequency of above-mentioned ultrasonic cleaning is 80KHz.
The method of zinc coating blackening at the above-mentioned soldering part gap prevented with gap is applied to the welding zero with gap
On part, following proposal can be obtained:
A kind of electrogalvanizing method for the soldering part with gap, comprising the following steps:
(1) parcel received is checked and accepted: being checked part to be processed, confirmation piece surface is completed, and no scuffing, burr etc. lack
It falls into, if piece surface greasy dirt situation is more serious, oil removing first is carried out to part with organic solvents such as gasoline；
(2) dress is hung: by design of part to parts fixation, being guaranteed that part is opening up, not will cause bubble coalescence, and conductive
Property is good；
(3) electrochemical degreasing and ultrasonic cleaning: the process is important procedure, because there are gaps for part, before part is zinc-plated
Oil sealing can be carried out with antirust oil to part, because antirust oil permeability is stronger, greasy dirt often removes unclean, all oil removings in gap
It is needed in the process to degreasing tank while carrying out ultrasonic cleaning, accelerate the decomposition of greasy dirt in gap, supersonic frequency 80KHz, the time 8 divides
Clock can extend depending on part gap depth；
(4) to check whether piece surface greasy dirt removes completely, moisture film inspection, parts list moisture film inspection: are carried out to part
The moisture film in face is continuous in 10~30s；
(5) to improve part binding force of cladding material, slight erosion weak corrosion: is carried out to part.
(6) zinc-plated: zinc-plated processing is carried out to part；
(7) go out light: to keep piece surface brightness higher, appearance is more preferable, carries out out light processing to part；
(8) ultrasonic cleaning: the process is important procedure, and because zinc-plated tank liquor is alkalinity, remaining tank liquor returns infiltration in gap
Zinc coat can be corroded, it is therefore desirable to solution remaining in gap is cleaned up, part is cleaned by ultrasonic, it will be residual in gap
The solution stayed cleans up, and supersonic frequency 80KHz, scavenging period 10min or more can extend depending on part gap depth；
(9) dry: part being dried, in time cleans out moisture remaining in gap, prevents residual rotten
Erosion, 80 DEG C of drying temperature, time 2h or more can extend depending on part gap depth；
(10) rainbow is passivated: processing is passivated to part after dry, it is blunt to prevent passivating solution from remaining in part gap
Change the time no more than 20s；
(11) ultrasonic cleaning: to guarantee that passivating solution will not remain in inside part gap, ultrasonic wave need to be carried out to part
Cleaning, remaining passivating solution is cleaned
(12) dry: part being dried, in time cleans out moisture remaining in gap, prevents residual rotten
Erosion, 80 DEG C of drying temperature, time 2h or more can extend depending on part gap depth；
(13) it examines: part being checked by technological procedure requirement.
Compared with prior art, greasy dirt often removes not completely at gap in such previous product of present invention change, leads
There is greasy dirt after cause plating and return infiltration, coating at this is caused to blister.Through ultrasonic cleaning+electrochemical degreasing method, while oil removing
The cleaning oil pollution in gap is clean, and using the high frequency ultrasound cleaning machine of 80KHz, the bubble of generation is smaller, imitates to the cleaning in gap
Fruit is more obvious.Part is zinc-plated+go out light after, part need to be cleaned by ultrasonic again, because galvanizing flux is strong basicity, remain in seam
Infiltration is returned in gap will cause zinc layers corrosion, and coating is caused to black, therefore need in time to remove galvanizing flux remaining in gap clean.Zero
After part passivation, to prevent passivating solution from penetrating into gap, part is cleaned by ultrasonic again, guarantees to remain at part gap
Corrosive media.After processing by the process flow, remaining corrosive medium at part gap is eliminated, guarantees part subsequent
Zinc coat corrosion blackening phenomena will not occur in the process, improve the corrosion resistance and presentation quality of part.
Specific embodiment
By normal tape gap part processing flow, the present invention is further illustrated below, but not that should not be interpreted as this with regard to this
The range for inventing the theme is only limitted to embodiment below, without departing from the idea case in the present invention described above, all bases
Various modifications, replacement and the change that ordinary skill knowledge and customary means are made, are included within the scope of the present invention.
The blackening of part coating is to return infiltration due to remaining in back of weld and internal micro gap structure erosion substance and make
At therefore, the cleaning of addition high-frequency ultrasonic is in time to the micro gap structure of back of weld and inside between the zinc-plated process of part
It is cleared up, the corrosive deposit in the micro gap structure of the effective trimming back side of energy and inside.Prevent part subsequent
Storage during occur zinc coating corrode blackening phenomena.
Above-mentioned electrogalvanizing method is applicable in band gap welded seam part, is illustrated below to main manufacturing procedure.
1. parcel received is checked and accepted, piece surface is not allow for serious casting skin, greasy dirt, crackle, weighs wounded, deforms, scuffing of colliding with, hair
The defects of thorn；
2. Solvent degreasing, 180# gasoline selects on demand, can be without when piece surface cleans；
3. it is dry, it dries in air or dries up part with compressed air；
4. dress is hung, fixture should completely remove surface oxide skin completely before use；Female part recess is upward, is convenient for
Electroplating process Bubble；
5. electrochemical deoiling, degreasing powder, 30~50g/L of concentration, time≤30min, the serious part of greasy dirt carry out；
6. hot water wash, the time is 5~10s, temperature >=60 DEG C；
7. flowing cool water is washed；
8. electrochemical degreasing, oil removing solution component includes sodium carbonate (Na2CO3), sodium phosphate (Na3PO4), sodium hydroxide
(NaOH) and sodium metasilicate (Na2SiO3), wherein sodium carbonate (Na2CO3) and sodium phosphate (Na3PO4) 20~30g/L of concentration, hydrogen-oxygen
Change the 30~40g/L of concentration, sodium metasilicate (Na2SiO of sodium (NaOH)3) 3~5g/L of concentration (above-mentioned concentration refers to electrochemical degreasing liquid
In the component concentration, the ratio in solution between each component determines by the concentration of each component in electrochemical degreasing solution), electrification
Learn the oil removing time: 5~8min of anode, temperature: 60~80 DEG C, current density: 3~10A/dm2 (while oil removing, is with frequency
The supersonic wave cleaning machine of 80KHz simultaneously cleans part, and electrode material is steel plate or nickel-clad steel plate, and part does not allow cathode
When greasy dirt is heavier, 5~15min of oil removing time can be appropriately extended in oil removing)；
9. hot water wash, time: 5~10S, temperature >=60 DEG C；
10. flowing cool water is washed；
11. moisture film inspection, piece surface moisture film is continuous in 10~30s；
12. weak corrosion, sulfuric acid (H2SO4) density be 1.84g/ml, 100~150g/L of concentration, the time: 0.5~1.5min,
Temperature is in room temperature；
13. flowing cool water is washed；
14. neutralizing, sodium carbonate (Na is selected2CO3) as solution is neutralized, concentration is 30~50g/L, time: 3~5min, temperature
Degree: room temperature；
15. flowing cool water is washed；
16. zinc-plated, zinc oxide (ZnO) 10~20g/L of solution concentration of use, sodium hydroxide (NaOH) solution concentration 110
~160g/L, open cylinder agent, 15~30ml/L of concentration, brightener, 1~5ml/L of concentration detect thickness of coating every 10min, to determine
Electroplating time, temperature: 15~30 DEG C, current density: 3~5A/dm2；
17. flowing cool water is washed；
18. ultrasonic cleaning carries out ultrasonic cleaning, frequency 80KHz, time to part in clean cold rinse bank
10min or more；,
19. dry, carry out being put into baking oven drying after part is dried up, 80 DEG C of drying temperature, time 2h or more；
20. rainbow is passivated, passivating dip component includes chromic anhydride (CrO3), concentration 4~5g/L, H2SO4(density 1.84g/
Ml), 0.3~0.5ml/L of concentration, nitric acid (HNO3) density 1.42g/ml, 1.5~1.75ml/L of concentration, acetic acid (CH3COOH), dense
2~2.5ml/L is spent, the time: 5~20s, passivation temperature is in room temperature；
21. flowing cool water is washed；
22. ultrasonic cleaning carries out ultrasonic cleaning, frequency 80KHz, time 5min to part in clean cold rinse bank
More than；
23. dry, carry out being put into baking oven drying after part is dried up, 80 DEG C of drying temperature, time 2h or more；
24. disassembly, when disassembly, are careful not to injuring part；
25. examining, test by HB5035 requirement to part.
Claims (10)
1. preventing the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap, it is characterised in that: including part plating
Electrochemical degreasing and ultrasonic cleaning before zinc, and electrochemical degreasing and ultrasonic cleaning carry out simultaneously；
Ultrasonic cleaning after part is zinc-plated first carries out ultrasonic cleaning, is then dried, dried after part is zinc-plated
Cheng Houzai is passivated part, carries out ultrasonic cleaning and drying to part again after passivation.
2. the electrogalvanizing method of zinc coating blackening at the soldering part gap according to claim 1 prevented with gap,
Be characterized in that: the ultrasonic frequency of the ultrasonic cleaning is 80KHz.
3. a kind of electrogalvanizing method for the soldering part with gap, which comprises the following steps:
Step 1, electrochemical degreasing and ultrasonic cleaning carry out ultrasonic cleaning, accelerating slit to degreasing tank in oil removal process simultaneously
The decomposition of greasy dirt in gap；
Step 2, weak corrosion carry out slight erosion to part to improve part binding force of cladding material；
Step 3, it is zinc-plated, zinc-plated processing is carried out to part；
Step 4, ultrasonic cleaning are cleaned by ultrasonic part, and solution remaining in gap is cleaned up；
Step 5, it is dry, part is dried；
Step 6, rainbow passivation, is passivated processing to part after dry；
Step 7, ultrasonic cleaning carry out ultrasonic cleaning to part, remaining passivating solution are cleaned；
Step 8, it is dry, part is dried, moisture remaining in gap is cleaned out.
4. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: described
Further including that parcel received checks and accepts step before step 1, part to be processed is checked, confirmation piece surface is complete, no scuffing,
Veining defect first carries out oil removing to part with organic solvent if piece surface greasy dirt situation is more serious.
5. a kind of electrogalvanizing method for the soldering part with gap according to claim 4, it is characterised in that: described
Parcel received further includes that dress hangs step after checking and accepting step, by design of part to parts fixation, guarantees that part is opening up.
6. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: described
It include sodium carbonate, sodium phosphate, sodium hydroxide and sodium metasilicate, wherein sodium carbonate and phosphoric acid in electrochemical degreasing solution in step 1
The concentration of sodium is 20~30g/L, and the concentration of sodium hydroxide is 30~40g/L, and the concentration of sodium metasilicate is 3~5g/L.
7. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: described
It include chromic anhydride, sulfuric acid, nitric acid and acetic acid in rainbow passivating dip in step 6, wherein chromium anhydride concentration is 4~5g/L, and sulfuric acid is dense
0.3~0.5ml/L is spent, concentration of nitric acid is 1.5~1.75ml/L, and acetic acid concentration is 2~2.5ml/L.
8. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: described
In step 2, the weak sulfuric acid solution concentration used of corroding of part is 100~150g/L.
9. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: described
In step 5 and step 8, part is dried under 80 DEG C of dry environment.
10. a kind of electrogalvanizing method for the soldering part with gap according to claim 3, it is characterised in that: institute
Step 5 is stated to carry out in 80 DEG C of baking ovens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910755204.9A CN110438533A (en) | 2019-08-15 | 2019-08-15 | Prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910755204.9A CN110438533A (en) | 2019-08-15 | 2019-08-15 | Prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap |
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| CN110438533A true CN110438533A (en) | 2019-11-12 |
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| CN201910755204.9A Pending CN110438533A (en) | 2019-08-15 | 2019-08-15 | Prevent the electrogalvanizing method of zinc coating blackening at the soldering part gap with gap |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590085A (en) * | 2013-11-13 | 2014-02-19 | 北京达博有色金属焊料有限责任公司 | Surface treatment method of aluminum spool for bonding wire production |
| CN107299365A (en) * | 2017-06-29 | 2017-10-27 | 十堰市协兴工贸有限公司 | A kind of weldment plates post-passivation process |
| CN109385649A (en) * | 2018-12-24 | 2019-02-26 | 陕西航天时代导航设备有限公司 | A kind of crisp acid cyanideless electro-plating zinc technology method of low hydrogen |
-
2019
- 2019-08-15 CN CN201910755204.9A patent/CN110438533A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590085A (en) * | 2013-11-13 | 2014-02-19 | 北京达博有色金属焊料有限责任公司 | Surface treatment method of aluminum spool for bonding wire production |
| CN107299365A (en) * | 2017-06-29 | 2017-10-27 | 十堰市协兴工贸有限公司 | A kind of weldment plates post-passivation process |
| CN109385649A (en) * | 2018-12-24 | 2019-02-26 | 陕西航天时代导航设备有限公司 | A kind of crisp acid cyanideless electro-plating zinc technology method of low hydrogen |
Non-Patent Citations (1)
| Title |
|---|
| 田孝成: "焊接件镀锌工艺", 《电话与交换》 * |
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Application publication date: 20191112 |