CN107513681A - A kind of hot-dip galvanizing technique - Google Patents
A kind of hot-dip galvanizing technique Download PDFInfo
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- CN107513681A CN107513681A CN201710710675.9A CN201710710675A CN107513681A CN 107513681 A CN107513681 A CN 107513681A CN 201710710675 A CN201710710675 A CN 201710710675A CN 107513681 A CN107513681 A CN 107513681A
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- 238000005246 galvanizing Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000243 solution Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000005554 pickling Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 239000003595 mist Substances 0.000 claims abstract description 5
- -1 12 15g/L Substances 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims abstract description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 4
- 230000001629 suppression Effects 0.000 claims abstract description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 33
- 239000011701 zinc Substances 0.000 claims description 33
- 229910052725 zinc Inorganic materials 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 20
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000003507 refrigerant Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 150000007524 organic acids Chemical class 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000002161 passivation Methods 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 4
- 239000006079 antiknock agent Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 2
- 235000014655 lactic acid Nutrition 0.000 claims description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 2
- 229960004889 salicylic acid Drugs 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 230000009849 deactivation Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
Classifications
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- 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
- C23C22/07—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 phosphates
- C23C22/08—Orthophosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Coating With Molten Metal (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a kind of hot-dip galvanizing technique, comprise the following steps：The first step, oil removing：Workpiece is poured into the mixed solution of the sodium hydroxide by 10 12g/L sodium carbonate, 12 15g/L, solution temperature is 90~100 DEG C, reaches workpiece completely by untill infiltration；Second step, pickling, 5~10min of pickling in the sulfuric acid solution that concentration is 15%~20% is put the workpiece in, and addition suppression mist corrosion inhibiter, pickling temperature are 30~50 DEG C in the solution, and 2~3min is rinsed with clear water after pickling is complete；3rd step, with 50 60 DEG C of warm water cleaning workpieces.Hot-dip galvanizing technique cooling link cooling velocity is fast, and water consumption is small, and energy consumption is low, and uses chromium-free deactivation, environmentally friendly.
Description
Technical field：
The present invention relates to zinc-plated field, is especially a kind of hot-dip galvanizing technique.
Background technology：
Hot-dip galvanizing technique generally comprises following steps:Pickling, clean, help plating, galvanizing by dipping, cooling and passivation, wherein,
Acid mist is also easy to produce in acid cleaning process, has a strong impact on working environment, and pickling time grasp is incorrect, can consume a large amount of hydrochloric acid；
Galvanizing by dipping layer formation process is the process that iron-kirsite is formed between iron-based body and outmost pure zinc layer, and workpiece surface exists
Iron-zinc alloy layer is formed during hot-dip, just to be combined very well between iron and pure zinc layer, but zinc gray can be produced during this,
Galvanizing quality is not only influenceed, and influences production efficiency；Because the workpiece after hot dipping is the height close to 400 DEG C in cooling procedure
Temperature, if common water cooling, cooling effect is bad not to be said, cooling water temperature is drastically raised, it is necessary to change cooling water in real time, is consumed
Water is big, and cooling effect is bad；It is exactly finally passivating process, existing passivating solution is typically environmental pollution than more serious
Sexavalence chromium passivating based on chromic salts.Furthermore the galvanized part uneven coating of existing process production is even, perishable.
The content of the invention：
The technical problem to be solved by the invention is to provide a kind of production environment is friendly, galvanizing quality is high, galvanized part coating
Uniformly, corrosion resistant hot-dip galvanizing technique, zincincation cooling link cooling velocity is fast, and water consumption is small, and energy consumption is low, and adopts
It is environmentally friendly with chromium-free deactivation.
The technical solution of the present invention is to provide a kind of hot-dip galvanizing technique, comprises the following steps：
The first step, oil removing：Workpiece is poured into the mixed solution of the sodium hydroxide by 10-12g/L sodium carbonate, 12-15g/L
In, solution temperature is 90~100 DEG C, reaches workpiece completely by untill infiltrating；
Second step, pickling, 5~10min of pickling in the sulfuric acid solution that concentration is 15%~20% is put the workpiece in, and molten
Addition suppression mist corrosion inhibiter, pickling temperature are 30~50 DEG C in liquid, and 2~3min is rinsed with clear water after pickling is complete；
3rd step, with 50-60 DEG C of warm water cleaning workpiece；
4th step, impregnate quickening liquid, put the workpiece in zinc chloride-aqueous ammonium chloride solution and impregnate, dipping temperature be 60~
70 DEG C, dip time is 1~3min；
5th step, drying preheating, in order to prevent workpiece from being deformed in immersion plating because temperature drastically raises, and removes remnants
Moisture, quick-fried zinc is prevented, cause zinc liquid is quick-fried to splash, generally 80~125 DEG C of preheating；
6th step, galvanizing by dipping, the workpiece after preheating is put into zinc liquid, zinc liquid temperature is 450~495 DEG C, when soaking zinc
Between be 3~6min, and be passed through pressure-air in zinc liquid, zinc liquid is constantly rolled in workpiece surface, to remove zinc gray, and with scraping
Grey device removes the zinc gray floated；
7th step, cooling, put the workpiece in cooling water of the temperature less than 30 DEG C and cool down, wherein, cooling bay bottom is set
Sub-cooled matchmaker's bending tube, sub-cooled matchmaker is using LNG cold energy as low-temperature receiver, by the temperature of normal temperature refrigerant after being exchanged heat with normal temperature refrigerant
- 50~-15 DEG C are down to, the natural gas after heat exchange is used to heat the solution temperature in other steps；
8th step, passivation, rinsing, puts the workpiece in passivating solution after being passivated and rinses, then air-dry, passivating solution is by metatitanic acid
Salt, phosphate, modifying epoxy resin by organosilicon, organic acid and water composition.
Preferably, anti-knock agent is additionally added in step 4.
Further, one or more of the organic acid in citric acid, tartaric acid, salicylic acid or lactic acid in step 8.
The beneficial effects of the invention are as follows：This technique productions is environment-friendly, galvanizing quality is high, galvanized part coating is uniform, corrosion resistant
Erosion, zincincation cooling link cooling velocity is fast, and water consumption is small, and energy consumption is low, and uses chromium-free deactivation, environmentally friendly.
Embodiment：
With reference to embodiment, the invention will be further described：
A kind of hot-dip galvanizing technique, comprises the following steps：
The first step, oil removing：Workpiece is poured into the mixed solution of the sodium hydroxide by 10-12g/L sodium carbonate, 12-15g/L
In, solution temperature is 90~100 DEG C, reaches workpiece completely by untill infiltrating；
Second step, pickling, 5~10min of pickling in the sulfuric acid solution that concentration is 15%~20% is put the workpiece in, and molten
Addition suppression mist corrosion inhibiter, pickling temperature are 30~50 DEG C in liquid, and 2~3min is rinsed with clear water after pickling is complete；
3rd step, with 50-60 DEG C of warm water cleaning workpiece；
4th step, impregnate quickening liquid, put the workpiece in zinc chloride-aqueous ammonium chloride solution and impregnate, dipping temperature be 60~
70 DEG C, dip time is 1~3min, and adds anti-knock agent in zinc chloride-aqueous ammonium chloride solution；
5th step, drying preheating, in order to prevent workpiece from being deformed in immersion plating because temperature drastically raises, and removes remnants
Moisture, quick-fried zinc is prevented, cause zinc liquid is quick-fried to splash, generally 80~125 DEG C of preheating；
6th step, galvanizing by dipping, the workpiece after preheating is put into zinc liquid, zinc liquid temperature is 450~495 DEG C, when soaking zinc
Between be 3~6min, and be passed through pressure-air in zinc liquid, zinc liquid is constantly rolled in workpiece surface, to remove zinc gray, and with scraping
Grey device removes the zinc gray floated；
7th step, cooling, put the workpiece in cooling water of the temperature less than 30 DEG C and cool down, wherein, cooling bay bottom is set
Sub-cooled matchmaker's bending tube, cooling water are tap water at normal temperature, and sub-cooled matchmaker changes using LNG cold energy as low-temperature receiver with normal temperature refrigerant
The temperature of normal temperature refrigerant is down to -20 DEG C after heat, the natural gas after heat exchange is used to heat the solution temperature in other steps；Although
The refrigerant temperature of cooling bay bottom is -20 DEG C, but upper strata running water water temperature initial temperature is soaked at 5-12 DEG C or so through high temperature workpiece
After entering, its temperature can be controlled between 20-30 DEG C substantially, can so use the cooling water cooling down high-temperature workpiece repeatedly in cooling bay
Without supplement cold water in real time.
8th step, passivation, rinsing, puts the workpiece in passivating solution after being passivated and rinses, then air-dry, passivating solution is by metatitanic acid
Salt, phosphate, modifying epoxy resin by organosilicon, organic acid and water composition, organic acid is citric acid and salicylic combination.
Claims (3)
1. a kind of hot-dip galvanizing technique, it is characterised in that comprise the following steps：
The first step, oil removing：Workpiece is poured into the mixed solution of the sodium hydroxide by 10-12g/L sodium carbonate, 12-15g/L,
Solution temperature is 90~100 DEG C, reaches workpiece completely by untill infiltrating；
Second step, pickling, 5~10min of pickling in the sulfuric acid solution that concentration is 15%~20% is put the workpiece in, and in the solution
Addition suppression mist corrosion inhibiter, pickling temperature is 30~50 DEG C, and 2~3min is rinsed with clear water after pickling is complete；
3rd step, with 50-60 DEG C of warm water cleaning workpiece；
4th step, quickening liquid is impregnated, puts the workpiece in zinc chloride-aqueous ammonium chloride solution and impregnates, dipping temperature is 60~70
DEG C, dip time is 1~3min；
5th step, drying preheating, in order to prevent workpiece from being deformed in immersion plating because temperature drastically raises, and removes residual water
Point, quick-fried zinc is prevented, causes zinc liquid is quick-fried to splash, generally 80~125 DEG C of preheating；
6th step, galvanizing by dipping, the workpiece after preheating is put into zinc liquid, zinc liquid temperature is 450~495 DEG C, galvanizing time 3
~6min, and pressure-air is passed through in zinc liquid, zinc liquid is constantly rolled in workpiece surface, to remove zinc gray, and use ash-scraper
The zinc gray floated is removed；
7th step, cooling, put the workpiece in cooling water of the temperature less than 30 DEG C and cool down, wherein, cooling bay bottom sets low temperature
Matchmaker's bending tube is cooled down, cooling water is tap water at normal temperature, and sub-cooled matchmaker is using LNG cold energy as low-temperature receiver, after being exchanged heat with normal temperature refrigerant
The temperature of normal temperature refrigerant is down to -50~-15 DEG C, the natural gas after heat exchange is used to heat the solution temperature in other steps；
8th step, passivation, rinsing, puts the workpiece in passivating solution after being passivated and rinses, then air-dry, passivating solution is by titanate, phosphorus
Hydrochlorate, modifying epoxy resin by organosilicon, organic acid and water composition.
2. hot-dip galvanizing technique according to claim 1, it is characterised in that anti-knock agent is additionally added in step 4.
3. hot-dip galvanizing technique according to claim 1, it is characterised in that organic acid is selected from citric acid, wine in step 8
One or more in stone acid, salicylic acid or lactic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710675.9A CN107513681B (en) | 2017-08-18 | 2017-08-18 | Hot-dip galvanizing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710675.9A CN107513681B (en) | 2017-08-18 | 2017-08-18 | Hot-dip galvanizing process |
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| CN107513681A true CN107513681A (en) | 2017-12-26 |
| CN107513681B CN107513681B (en) | 2019-12-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304572A (en) * | 2019-12-31 | 2020-06-19 | 桐乡市铁盛线路器材有限公司 | Hot-dip galvanizing process for corrosion-resistant steel pipe |
| CN111945091A (en) * | 2019-05-15 | 2020-11-17 | 扬州澳洋顺昌金属材料有限公司 | Galvanizing production process |
| CN114807812A (en) * | 2022-04-24 | 2022-07-29 | 上海聚丰热镀锌有限公司 | Hot-dip galvanizing process for metal plated part |
| CN114855109A (en) * | 2022-05-31 | 2022-08-05 | 杭州新兴车料有限公司 | Foldable scooter frame galvanizing process |
| CN114921741A (en) * | 2022-05-26 | 2022-08-19 | 中电建武汉铁塔有限公司 | Hot galvanizing process |
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| CN114807812A (en) * | 2022-04-24 | 2022-07-29 | 上海聚丰热镀锌有限公司 | Hot-dip galvanizing process for metal plated part |
| CN114921741A (en) * | 2022-05-26 | 2022-08-19 | 中电建武汉铁塔有限公司 | Hot galvanizing process |
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