CN113061825A - Iron art railing galvanizing process - Google Patents
Iron art railing galvanizing process Download PDFInfo
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- CN113061825A CN113061825A CN202110314620.2A CN202110314620A CN113061825A CN 113061825 A CN113061825 A CN 113061825A CN 202110314620 A CN202110314620 A CN 202110314620A CN 113061825 A CN113061825 A CN 113061825A
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- liquid
- zinc
- handrail
- acid
- water
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 32
- 238000005246 galvanizing Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000011701 zinc Substances 0.000 claims abstract description 50
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000007747 plating Methods 0.000 claims abstract description 36
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000002161 passivation Methods 0.000 claims abstract description 20
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 16
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 8
- 239000011592 zinc chloride Substances 0.000 claims abstract description 8
- 229920001213 Polysorbate 20 Polymers 0.000 claims abstract description 7
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims abstract description 7
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 6
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 35
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 26
- 239000002253 acid Substances 0.000 claims description 17
- 238000005554 pickling Methods 0.000 claims description 17
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 16
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000005238 degreasing Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 10
- 150000001412 amines Chemical class 0.000 claims description 8
- 150000002191 fatty alcohols Chemical class 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 6
- 238000012805 post-processing Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000007654 immersion Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 238000005406 washing Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000007665 sagging Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 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
- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to the technical field of metal surfaces, in particular to a zinc plating process for an iron art railing, which comprises the steps of hot-dip galvanizing a preprocessed railing component, and carrying out post-processing after the pretreatment is finished; the pretreatment comprises oil removal, rust removal and plating assistant, wherein the plating assistant is to immerse the railing member into plating assistant liquid at 55 ℃, and the plating assistant liquid comprises 120-200 g/L of zinc chloride, 2-5 g/L of Tween 20, 2-5 g/L of fluorocarbon surfactant F1157N and water; the immersion speed and the extraction speed of the handrail component are both 0.005-0.010 m/s, and the chemical components of the zinc liquid are Al: 0.35-0.85%, Ni: 0.03% -0.08%, Bi: 0.1 to 0.6 percent, and the balance of Zn and inevitable impurities; the post-treatment comprises cooling, passivation and rinsing. According to the invention, the components of the plating assistant solution raw material and the zinc solution are selected, so that the handrail component which is flat and smooth in appearance and has no obvious visible defects is obtained.
Description
Technical Field
The invention relates to the technical field of metal surfaces, in particular to a zinc plating process for an iron art railing.
Background
The iron art railing is a part with both decorative effect and protective effect, and is widely applied to the fields of municipal engineering, traffic and the like, and railings can be installed on the two sides of a road, the periphery of a central isolation belt, near a building and the like so as to achieve the purposes of regional division and attractive decoration.
In order to avoid the corrosion of the iron handrails caused by weather or environmental reasons when the iron handrails are used in the open air, the surfaces of the iron handrails need to be galvanized. Hot dip galvanizing is the most effective and practical rust prevention method for iron art railings at present, and specifically comprises the steps of polishing and degreasing the assembled iron art railings, and soaking the iron art railings in molten zinc. After hot-dip galvanizing treatment, a plating layer is formed on the surface of the iron art handrail and sequentially comprises a zeta layer, a delta layer and an eta layer from inside to outside, wherein the eta layer is a pure zinc layer, and the hardness of the plating layer is different from that of the zeta layer and the delta layer and is easy to collide to form a depression. After the zinc liquid is used for a long time, zinc slag can appear, and the zinc slag is attached to the iron art railing and can form granular protrusions on the surface of the iron art railing, so that the surface of a coating is rough, the appearance of the railing is influenced, the grade of a product is reduced, and the iron art railing is not favorable for market competition.
Disclosure of Invention
Aiming at the technical problem that the attractive appearance of the iron art handrail is damaged due to the appearance of defects such as granular protrusions and the like on the surface of the iron art handrail after hot dip galvanizing, the invention provides the galvanizing process of the iron art handrail.
A zinc plating process for an iron art railing, which comprises the steps of immersing a pretreated railing member into molten zinc for hot dip galvanizing, taking out the railing member after the hot dip galvanizing is finished, and performing post treatment;
the pretreatment comprises oil removal, rust removal and plating assistant, wherein the plating assistant is to immerse the railing member into plating assistant liquid at 50-60 ℃ for 1-10 min, and the plating assistant liquid comprises 120-200 g/L of zinc chloride, 2-5 g/L of Tween 20, 2-5 g/L of fluorocarbon surfactant F1157N and water;
the speeds of immersing and extracting the zinc liquid of the handrail component are both 0.005-0.010 m/s, and the chemical components and the content of the zinc liquid are Al: 0.35 wt% -0.85 wt%, Ni: 0.03 wt% -0.08 wt%, Bi: 0.1 to 0.6 weight percent, and the balance of Zn and inevitable impurities;
the post-treatment comprises cooling, passivation and rinsing.
Further, degreasing is to immerse the handrail component in pickling degreasing liquid for 15-30 min, wherein the pickling degreasing liquid comprises 150-300 mL/L hydrochloric acid, 100-150 mL/L sulfuric acid, 10-25 g/mL fatty amine polyoxyethylene ether, 25-40 g/mL fatty alcohol polyoxyethylene ether and water;
and the rust removal is to immerse the handrail component into an acid pickling rust removal liquid for 30-60 min, wherein the acid pickling rust removal liquid is a hydrochloric acid aqueous solution with the concentration of 350-500 mL/L.
And further, monitoring the content of hydrochloric acid in the pickling rust removing liquid, collecting the pickling rust removing liquid for filtration when the concentration of the hydrochloric acid is less than 300mL/L, and sending the filtrate to a degreasing section to be mixed with sulfuric acid, fatty amine polyoxyethylene ether and fatty alcohol polyoxyethylene ether to prepare the pickling rust removing liquid.
Furthermore, flowing water is used for washing the railing member after oil removal and rust removal, acid cleaning degreasing liquid and/or acid cleaning rust removal liquid remained on the surface of the railing member are removed, and influence on subsequent operation is reduced.
Furthermore, before hot dip galvanizing, the content of zinc dross in the zinc liquid is checked, the rail member is placed after the zinc dross is left stand for 5-10 min after the slag is fished, the content of the zinc dross in the zinc liquid is observed at any time and the slag is fished, the adhesion of the zinc dross on the surface of the rail member is reduced as much as possible, the zinc dross caused by the slag is prevented from floating upwards when the zinc dross is left stand after the slag is fished, and the condition that the appearance of the rail member is damaged is effectively avoided.
Further, the cooling comprises primary air cooling and secondary water cooling, the handrail component is firstly cooled in air for 5-10 min and then immersed in flowing water with the water temperature of less than or equal to 50 ℃ for cooling for 1-5 min, and a cooling mode of firstly air cooling and then water cooling is adopted, so that the handrail component has the advantages of saving water and reducing energy consumption, and the cracking condition of the handrail component can be effectively avoided.
Further, passivation is to immerse the railing member in passivation solution for 0.5-2 min, the passivation solution is 1-3 g/L potassium dichromate, 0.5-2 g/L sulfuric acid and water, and the passivation solution formed by potassium dichromate and sulfuric acid can form a colored passivation film on the surface of the railing member, so that the railing member is endowed with good corrosion resistance, and the appearance of the railing member is improved to be attractive.
Further, the rinsing is to wash the handrail member with running water to remove the passivation solution remaining on the surface of the handrail member.
The beneficial effect of the invention is that,
according to the iron handrail galvanizing process provided by the invention, zinc chloride, Tween 20, fluorocarbon surfactant F1157N and water are used as the plating assistant solution, ammonium chloride is not used, excessive HCl release and ferric salt concentration increase caused by ammonium chloride decomposition are reduced, surfactant Tween 20 and F1157N are added, the deposition speed, the dispersibility and the surface tension of the plating assistant layer are improved, the integrity, the uniformity and the compactness of the plating assistant layer are improved, the surface smoothness of a handrail component after plating assistant is high, and plating omission is not easy to occur;
the immersion and extraction speeds of the handrail component during hot dip galvanizing are limited, so that the defects of pinholes, bubbles and the like caused by air brought by too high speed can be effectively avoided; the zinc liquid containing aluminum, nickel and bismuth is selected, so that the effects of increasing the fluidity of the zinc liquid, slowing down the formation of zinc slag, reducing the thickness of a coating, improving the brightness of the coating, improving the adhesive force of the coating and enhancing the corrosion resistance of the coating can be achieved;
the rail coating obtained by the iron rail galvanizing process provided by the invention is complete, uniform in thickness, free of obvious bubbles, pinholes, sagging and granular raised flaws, high in attractiveness, good in corrosion resistance effect and strong in market competitiveness.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An iron art railing is assembled by adopting hot-dip galvanized railing components, and the hot-dip galvanizing process of the railing components comprises the following steps:
s1 pretreatment:
s11 oil removal: soaking the railing member into acid-washing deoiling liquid for 15min, wherein the acid-washing deoiling liquid comprises 260mL/L hydrochloric acid, 140mL/L sulfuric acid, 20g/mL fatty amine polyoxyethylene ether, 30g/mL fatty alcohol polyoxyethylene ether and water, flushing the railing member by using flowing water after deoiling, and removing the acid-washing deoiling liquid remained on the surface of the railing member;
s12 rust removal: soaking the handrail component into acid cleaning rust removing liquid for 30min, wherein the acid cleaning rust removing liquid is 500mL/L hydrochloric acid aqueous solution, flushing the handrail component with flowing water after rust removal, and removing the residual acid cleaning rust removing liquid on the surface of the handrail component;
monitoring the content of hydrochloric acid in the pickling derusting solution, collecting the pickling derusting solution when the concentration of the hydrochloric acid is less than 300mL/L, filtering, and sending the filtrate to an oil removal working section to be mixed with sulfuric acid, fatty amine polyoxyethylene ether and fatty alcohol polyoxyethylene ether to prepare pickling derusting liquid;
s13 plating aid: immersing the handrail component into an auxiliary plating solution at 55 ℃ for 5min, wherein the auxiliary plating solution comprises 150g/L of zinc chloride, 3g/L of Tween 20, 3g/L of fluorocarbon surfactant F1157N and water;
s2 hot dip galvanization:
checking the content of zinc slag in the zinc liquid, after slag is fished, standing for 10min, then putting the rail component into the molten zinc liquid, and immersing the rail component into the molten zinc liquid at 0.008m/s, wherein the chemical components and the content of the zinc liquid are Al: 0.44 wt%, Ni: 0.07 wt%, Bi: 0.25 wt%, the balance of Zn and inevitable impurities, and after finishing, lifting the handrail component at 0.008 m/s;
and S3 post-processing:
s31, cooling: the method comprises primary air cooling and secondary water cooling, wherein the railing member is cooled in air for 8min and then immersed in flowing water with the water temperature less than or equal to 50 ℃ for cooling for 2 min;
s32 passivation: immersing the railing member in a passivation solution for 0.5min, wherein the passivation solution comprises 2.94g/L potassium dichromate, 0.98g/L sulfuric acid and water;
s33 rinsing: and (4) flushing the railing member by using flowing water to remove the passivation solution remained on the surface of the railing member.
And drying the handrail components obtained in the steps, collecting the handrail components, and assembling the handrail components according to the design during use to obtain the finished iron art handrail.
Example 2
An iron art railing is assembled by adopting hot-dip galvanized railing components, and the hot-dip galvanizing process of the railing components comprises the following steps:
s1 pretreatment:
s11 oil removal: soaking the railing member into acid-washing deoiling liquid for 30min, wherein the acid-washing deoiling liquid comprises 200mL/L hydrochloric acid, 100mL/L sulfuric acid, 12g/mL fatty amine polyoxyethylene ether, 28g/mL fatty alcohol polyoxyethylene ether and water, flushing the railing member by using flowing water after deoiling, and removing the acid-washing deoiling liquid remained on the surface of the railing member;
s12 rust removal: soaking the handrail component into acid cleaning rust removing liquid for 60min, wherein the acid cleaning rust removing liquid is 350mL/L hydrochloric acid aqueous solution, flushing the handrail component with flowing water after rust removal, and removing residual acid cleaning rust removing liquid on the surface of the handrail component;
monitoring the content of hydrochloric acid in the pickling derusting solution, collecting the pickling derusting solution when the concentration of the hydrochloric acid is less than 300mL/L, filtering, and sending the filtrate to an oil removal working section to be mixed with sulfuric acid, fatty amine polyoxyethylene ether and fatty alcohol polyoxyethylene ether to prepare pickling derusting liquid;
s13 plating aid: immersing the handrail component into an auxiliary plating solution at 55 ℃ for 3min, wherein the auxiliary plating solution comprises 200g/L of zinc chloride, 5g/L of Tween 20, 5g/L of fluorocarbon surfactant F1157N and water;
s2 hot dip galvanization:
checking the content of zinc slag in the zinc liquid, after slag is fished, standing for 10min, then putting the rail component into the molten zinc liquid, and immersing the rail component into the molten zinc liquid at 0.008m/s, wherein the chemical components and the content of the zinc liquid are Al: 0.72 wt%, Ni: 0.05 wt%, Bi: 0.38 wt%, the balance of Zn and inevitable impurities, and after finishing, lifting the handrail component at 0.008 m/s;
and S3 post-processing:
s31, cooling: the method comprises primary air cooling and secondary water cooling, wherein the railing member is cooled in air for 5min and then immersed in flowing water with the water temperature less than or equal to 50 ℃ for cooling for 5 min;
s32 passivation: immersing the handrail component in a passivation solution for 1min, wherein the passivation solution comprises 1.47g/L of potassium dichromate, 1.96g/L of sulfuric acid and water;
s33 rinsing: and (4) flushing the railing member by using flowing water to remove the passivation solution remained on the surface of the railing member.
And drying the handrail components obtained in the steps, collecting the handrail components, and assembling the handrail components according to the design during use to obtain the finished iron art handrail.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the chemical components and the contents of the zinc bath are different, and the zinc bath of the comparative example 1 includes Zn and inevitable impurities.
Comparative example 2
The difference between the comparative example 2 and the example 1 is that the acid-washing degreasing liquid is different, and the acid-washing degreasing liquid of the comparative example 2 is 260mL/L hydrochloric acid, 140mL/L sulfuric acid and water.
Comparative example 3
The difference between the comparative example 3 and the example 1 is that the assistant plating solution is different, and the assistant plating solution of the comparative example 3 is 150g/L zinc chloride aqueous solution.
The rail members of the examples 1-2 and the comparative examples 1-3 are subjected to hot dip galvanizing, the rail members of the examples 1-2 are free from defects such as bubbles, pinholes, sagging, granular bulges and the like which are visible to naked eyes, and the coating is flat and smooth; comparative example 1 the surface of the handrail member has granular protrusions and the local part has sagging defects, because pure zinc liquid has relatively weak fluidity and is easy to generate zinc slag; comparative example 2 the surface of the handrail member is uneven, which is caused by poor adhesion effect and uneven thickness of the plating layer and the plating layer at the position where the degreasing is incomplete due to the unsatisfactory degreasing effect of the pretreatment of the handrail member; comparative example 3 the surface of the handrail member was uneven and had a defect of plating missing locally due to poor dispersion effect but too fast deposition rate when a single aqueous solution of zinc chloride was used as the plating aid.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. A zinc plating process for an iron art handrail is characterized in that a pretreated handrail component is immersed into molten zinc liquid for hot dip galvanizing, and after the hot dip galvanizing is finished, the handrail component is taken out and post-treated;
the pretreatment comprises oil removal, rust removal and plating assistant, wherein the plating assistant is to immerse the railing member into plating assistant liquid at 50-60 ℃ for 1-10 min, and the plating assistant liquid comprises 120-200 g/L of zinc chloride, 2-5 g/L of Tween 20, 2-5 g/L of fluorocarbon surfactant F1157N and water;
the speeds of immersing and extracting the zinc liquid of the handrail component are both 0.005-0.010 m/s, and the chemical components and the content of the zinc liquid are Al: 0.35 wt% -0.85 wt%, Ni: 0.03 wt% -0.08 wt%, Bi: 0.1 to 0.6 weight percent, and the balance of Zn and inevitable impurities;
the post-treatment comprises cooling, passivation and rinsing.
2. The iron art handrail galvanizing process according to claim 1, wherein the oil removing step is to dip the handrail component into an acid cleaning deoiling liquid for 15-30 min, wherein the acid cleaning deoiling liquid comprises 150-300 mL/L hydrochloric acid, 100-150 mL/L sulfuric acid, 10-25 g/mL fatty amine polyoxyethylene ether, 25-40 g/mL fatty alcohol polyoxyethylene ether and water;
and the rust removal is to immerse the handrail component into an acid pickling rust removal liquid for 30-60 min, wherein the acid pickling rust removal liquid is a hydrochloric acid aqueous solution with the concentration of 350-500 mL/L.
3. The iron art handrail galvanizing process according to claim 2, wherein the content of hydrochloric acid in the acid cleaning rust removing liquid is monitored, when the concentration of hydrochloric acid is less than 300mL/L, the acid cleaning rust removing liquid is collected and filtered, and the filtrate is sent to a degreasing section to be mixed with sulfuric acid, fatty amine polyoxyethylene ether and fatty alcohol polyoxyethylene ether to prepare acid cleaning degreasing liquid.
4. The process of claim 1, wherein the flowing water is used to flush the balustrade member after oil and rust removal to remove the residual pickling degreasing fluid and/or pickling rust removing fluid on the surface of the balustrade member.
5. The process of galvanizing an iron rail according to claim 1, wherein before hot dip galvanizing, the content of zinc dross in the zinc bath is checked, and after slag removal, the iron rail is placed into the rail after standing for 5-10 min.
6. The process of galvanizing an iron art rail according to claim 1, wherein the cooling includes primary air cooling and secondary water cooling, and the rail member is first cooled in air for 5-10 min and then immersed in flowing water with a water temperature of less than or equal to 50 ℃ for cooling for 1-5 min.
7. The process of claim 1, wherein the passivation step comprises immersing the balustrade component in a passivation solution for 0.5-2 min, wherein the passivation solution comprises 1-3 g/L potassium dichromate, 0.5-2 g/L sulfuric acid and water.
8. The process of galvanization of iron art rails as in claim 1, wherein the rinsing is flushing the rail member with running water to remove the residual passivating solution from the surface of the rail member.
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