CN113186476B - Hot galvanizing process method for coil-type scaffold - Google Patents

Hot galvanizing process method for coil-type scaffold Download PDF

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Publication number
CN113186476B
CN113186476B CN202110479177.4A CN202110479177A CN113186476B CN 113186476 B CN113186476 B CN 113186476B CN 202110479177 A CN202110479177 A CN 202110479177A CN 113186476 B CN113186476 B CN 113186476B
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tank
pickling
workpiece
acid cleaning
plating
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CN113186476A (en
Inventor
刘成强
徐海港
刘爱萍
李悦
杨金河
李长恩
姚红蕾
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Shandong Shifeng Commercial Vehicle Co ltd
Shandong Shifeng Group Co Ltd
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Shandong Shifeng Commercial Vehicle Co ltd
Shandong Shifeng Group Co Ltd
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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
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention discloses a hot galvanizing process method for a coil-fastener type scaffold. The method comprises the following process steps: (1): fastening and hanging a workpiece; (2): acid washing: the pickling solution in the pickling tank is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃; (3): washing with water; (4): plating assistance: the mass ratio of zinc chloride to ammonium chloride in the plating assistant solution is 1.2-1.6: 1, the pH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃; (5): hot galvanizing: the temperature of the zinc liquid in the zinc plating tank is 435-; (6): cooling; (7): passivating; (8) repairing materials; (9): and (3) refluxing the tool, and returning the hot galvanized tool hanger to a deplating tank for deplating, wherein the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%.

Description

Hot galvanizing process method for coil-type scaffold
Technical Field
The invention relates to a hot galvanizing process method for a coil-fastener type scaffold.
Background
Hot dip galvanizing is one of the most effective means for retarding the environmental corrosion of steel and iron materials, and is to dip the steel and iron products with their surfaces cleaned and activated in molten zinc bath to plate a zinc alloy plating layer with good adhesion on the steel and iron products through the reaction and diffusion between iron and zinc. Compared with other metal protection methods, the hot-dip galvanizing process has incomparable advantages in the protection characteristic of the combination of the physical barrier and the electrochemical protection of the plating layer, the bonding strength of the plating layer and the substrate, the compactness, the durability, the maintenance-free property and the economical efficiency of the plating layer and the adaptability of the plating layer to the shape and the size of a product.
At present, hot-dip galvanized products mainly comprise steel pipes, steel plates, steel strips, steel wires and the like, wherein the proportion of the hot-dip galvanized steel pipes to the hot-dip galvanized steel plates is large. The disk-type scaffold is a scaffold for buildings which is widely applied at present, and the production execution standard (JG/T503-.
The existing hot galvanizing process for steel plates, steel pipes and the like generally has the defects of low production efficiency, low production capacity, poor uniformity of a galvanized layer, poor durability and the like, and can not meet the hot galvanizing production of the coil buckle type scaffold.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the hot galvanizing process method for the coil button type scaffold, which has high production efficiency, high production capacity, good uniformity of a zinc coating and good durability.
The invention is realized by the following technical scheme: a hot galvanizing process method for a coil-buckled scaffold is characterized by comprising the following steps: the method comprises the following process steps:
step (1): the black parts are fastened and hung through a tool hanger and then conveyed to the upper part of a feed chute by a travelling crane, and workpieces are conveyed to a pretreatment area through a chain type conveying system;
step (2): acid washing: conveying the workpiece forwards in a stepping manner through a lifting and walking system to pass through a plurality of pickling tanks for pickling treatment so as to remove rust and dirt on the surface of the workpiece, wherein pickling solution in the pickling tanks is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃;
and (3): washing with water: conveying the pickled workpiece step by step through a hoisting walking system to pass through a rinsing bath for rinsing;
and (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the pH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃;
and (5): hot galvanizing: after being fastened for the second time, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, the temperature of the zinc liquid in the galvanizing bath is 435-;
and (6): and (3) cooling: conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃;
and (7): passivation: conveying the cooled workpiece into a passivation tank through a circular rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator;
and (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and conveying the repaired workpiece to a packaging area for packaging;
and (9): the tool is refluxed, and the hot galvanized tool hanger is returned to a deplating tank for deplating so as to remove a galvanized layer on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%.
In the invention, the process steps of acid washing, water washing, plating assisting and the like all adopt step-by-step conveying, so that the production efficiency can be greatly improved. The workpiece can effectively remove rust, dirt and the like on the surface of the workpiece through acid washing, and the adhesiveness of a zinc coating is facilitated. The mass ratio of zinc chloride to ammonium chloride in the plating assistant solution adopted in the invention is 1.2-1.6: 1, under the proportion, zinc chloride and ammonium chloride can generate better plating assisting effect through complementation, and salt film formed on the surface of a workpiece has better thermal stability, thereby being beneficial to improving the quality of a subsequent zinc coating. When the content of iron salt in the plating assistant liquid exceeds the standard, the quality of zinc liquid can be influenced, the production of zinc ash and zinc slag can be improved, the zinc consumption is increased, and the quality of a zinc coating is reduced: the iron salt is carried into the zinc liquid along with the assistant plating double salt film and reacts with the zinc liquid, about 20 percent of iron enters the zinc coating (hemp grains or small particles), and the rest 80 percent of iron directly enters the zinc slag. The temperature of the plating assistant solution in the plating assistant tank is controlled to be 60-70 ℃, the temperature of the workpiece can be increased, the temperature difference between the workpiece and the zinc solution is reduced, and zinc explosion is prevented. In the invention, the main functions of adding aluminum into the zinc liquid are to improve the gloss of a hot dip galvanized layer and reduce the oxidation of the surface of a zinc bath, and the functions of adding nickel into the zinc liquid are to improve the fluidity and reduce the zinc consumption. The stripping solution in the stripping tank adopts hydrochloric acid with the mass percentage concentration of 10-12%, and the galvanized hanger can be subjected to zinc stripping treatment on the premise of reducing iron reaction to the maximum extent.
Furthermore, pickling is performed in a partition stepping mode during pickling, all pickling tanks are sequentially arranged along the conveying direction of the workpiece and are sequentially divided into three pickling areas, each pickling area is provided with at least two pickling tanks, a common pickling tank is arranged between every two adjacent pickling areas, the mass percentage concentration of a pickling solution in each pickling tank of the first area is 6% -10%, the mass percentage concentration of a pickling solution in each pickling tank of the second area is 13% -16%, and the mass percentage concentration of a pickling solution in each pickling tank of the third area is 18% -20%. Through the partitioned stepping pickling, the workpiece can be sufficiently pickled in each pickling area, the pickling effect is improved, the workpiece waiting time can be reduced through the partitioned stepping pickling, the production process is smoother, the production efficiency can be greatly improved, and the equipment production capacity is improved.
Furthermore, in order to ensure the pickling effect and the production efficiency, the pickling time of each workpiece in a pickling tank in a pickling area is 8-15 minutes.
Furthermore, 10-11 pickling tanks are used for ensuring the pickling effect and the production efficiency; the rinsing baths are two rinsing baths which are sequentially arranged along the conveying direction of the workpiece, the two rinsing baths are one for one and one for standby, when the pH value of rinsing water in the rinsing baths is lower than 3, the rinsing baths are stopped, and the other rinsing bath is replaced to finish water washing.
Furthermore, a pre-zinc-stripping tank is arranged between the rinsing tank and the plating assisting tank, and the stripping liquid in the pre-zinc-stripping tank is hydrochloric acid with the mass percentage concentration of 10% -12%. Through setting up the zinc groove of moving back in advance, can get rid of the zinc that adheres to in the environment on the frock hanger, avoid the zinc that adheres to on the frock hanger to get into subsequent process, produce adverse effect to the galvanizing coat, influence hot-galvanize effect.
Further, in order to ensure that the factory area has no sour taste and no zinc smoke during production, the steps 2 to 4 are all completed in a totally closed negative pressure pickling room.
Further, in order to ensure that the acid mist generated in the production process can reach the standard and be discharged, the acid mist in the negative-pressure pickling room is captured and treated by primary water and secondary alkali liquor of an acid mist absorption tower, so that HCl is less than or equal to 100mg/m 3 。
Furthermore, in order to reduce energy consumption, the plating assisting tank is heated by tail gas of a combustion system of the galvanizing tank.
Furthermore, in order to reduce energy consumption, the pickling bath is heated by tail gas of a combustion system of the galvanizing bath and/or waste heat of cooling water.
The invention has the beneficial effects that: the method of the invention is adopted to carry out hot galvanizing on the disk-type scaffold, the bonding strength of the coating and the substrate is high, the compactness of the coating is good, the uniformity and the durability of the zinc coating are good, the appearance effect is good, and the service life of the disk-type scaffold can be prolonged. The process steps of pickling, washing, plating assisting and the like in the invention all adopt step-by-step conveying, so that the production efficiency can be greatly improved, the production capacity can be improved, particularly, the partitioned step-by-step pickling is adopted, the waiting time of workpieces can be reduced, the production process is smoother, and the production efficiency is greatly improved.
Drawings
FIG. 1 is a process flow diagram of the present invention in an embodiment;
FIG. 2 is a schematic illustration of a zone step pickling process according to the present invention in an embodiment;
FIG. 3 is a schematic view (front half) of the apparatus arrangement of the present invention in a specific embodiment;
FIG. 4 is a schematic view (second half) of the apparatus arrangement of the present invention in a specific embodiment;
in the figure, 1, traveling cranes I and 2, a feeding tank, 3, a negative pressure pickling room, 4, an acid mist absorption tower, 5, iron salt removing equipment, 6, a pickling tank, 7, a rinsing tank, 8, a zinc pre-stripping tank, 9, a plating assisting tank, 10, a pickling tool hanger return track, 11, pickling tool hanger transmission equipment, 12, a hoisting traveling system, 13, a small traveling crane, 14, a traveling crane II, 15, a galvanizing tank, 16, a pure water cooling tank, 17, a passivation tank, 18, a circular track, 19, dust removing equipment, 20, a cooling tower, 21, a stripping tank, 22, traveling cranes III and 23 and a traveling crane IV.
Detailed Description
The invention will now be further illustrated by way of non-limiting examples in conjunction with the accompanying drawings:
FIG. 1 is a process flow chart of the present invention, FIG. 2 is a schematic view of a sectional step pickling process, and FIGS. 3 and 4 are equipment layout views of a hot galvanizing process for a coil scaffold according to the present invention.
A hot galvanizing process method for a coil-fastener type scaffold comprises the following process steps:
step (1): and (4) after the black part is fastened and hung by a tool hanger, the black part is conveyed to the upper part of the feeding chute by a travelling crane, and the workpiece is conveyed to a pretreatment area by a chain type conveying system. And selecting a proper tool hanger according to the size and the shape of the workpiece and a bundling method to hang the black piece on the hanging bar.
Step (2): acid washing: the workpiece is conveyed forwards in a stepping mode through a lifting and walking system and then passes through a plurality of pickling tanks for automatic pickling treatment, and the purpose of removing rust and dirt on the surface of the workpiece is achieved. The pickling solution in the pickling tank is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃. The lifting walking system can be an electric hoist, and the workpiece is conveyed forwards in a stepping mode through the lifting walking system.
And (3): washing with water: and conveying the pickled workpiece by a hoisting walking system step by step to pass through a rinsing bath for rinsing.
And (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the pH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant tank is 60-70 ℃.
And (5): hot galvanizing: and after secondary hanging, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, wherein the temperature of the zinc liquid in the galvanizing bath is 435-.
And (6): and (3) cooling: and conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃.
And (7): passivation: and conveying the cooled workpiece into a passivation tank through a ring rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator which does not contain chromium and is an environment-friendly material.
And (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and conveying the repaired workpiece to a packaging area for packaging.
And (9): the tool is refluxed, and the hot galvanized tool hanger is returned to a deplating tank for deplating so as to remove a galvanized layer on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%. The pickled tool hanger can directly flow back to the initial position, the surface of the tool hanger subjected to hot galvanizing along with a workpiece is provided with a zinc coating, the zinc stripping treatment is required, the part of the tool hanger is conveyed into a stripping tank through a ring rail for stripping, and iron can react in a large amount while zinc on the tool hanger reacts with acid liquor in the stripping process. The comparative experiment can prove the effect of the deplating solution adopted by the invention: the tool hanger to be de-galvanized is placed in the de-plating solution to be soaked, when the concentration (3%) of the de-plating solution meets the requirement of entering a zinc chloride regeneration system, the de-plating solution is detected, wherein the iron ion content is about 20g/L, and the zinc content reaches 300 g/L. The hanger to be subjected to zinc stripping is placed in a stripping solution (hydrochloric acid with the mass percentage concentration of 20%) with the common proportioning concentration for soaking, and when the concentration (3%) of the stripping solution accords with that of the solution entering a zinc chloride regeneration system, the stripping solution is detected, wherein the iron ion content is about 50 g/L. Therefore, compared with the deplating solution with the common proportioning concentration, the deplating solution has good effect of removing and collecting zinc on the surface of the hanger and relatively weaker reaction with iron.
Meanwhile, because the iron content in the acid liquor is low, the deplating liquid can be used for regenerating zinc chloride and supplementing the zinc chloride in the plating bath, so that the production cost can be saved, and the economic benefit of an enterprise can be improved. Generally, when the concentration of the deplating solution (3%) is consistent with that of entering a zinc chloride regeneration system, the deplating solution can be used for regenerating zinc chloride.
In the pickling step of the present invention, when the stepwise pickling is adopted, the pickling may be performed one by one according to the configuration of the pickling tank, but in view of the production efficiency, the production capacity, and the pickling effect, it is preferable that: the pickling process comprises the steps of pickling according to a zone stepping mode, wherein all pickling tanks are sequentially arranged along the conveying direction of a workpiece and are sequentially divided into three pickling zones, each pickling zone is provided with at least two pickling tanks, a common pickling tank is arranged between every two adjacent pickling zones, the mass percentage concentration of pickling solution in the pickling tank of the first zone is 6-10%, the mass percentage concentration of pickling solution in the pickling tank of the second zone is 13-16%, and the mass percentage concentration of pickling solution in the pickling tank of the third zone is 18-20%. The number of pickling tanks is 10-11, and the pickling time of each workpiece in the pickling tank in one pickling area is 8-15 minutes. As shown in FIG. 2, the 11 pickling tanks are divided into three groups, the 1# -3# pickling tank is the first zone, the 5# -7# pickling tank is the second zone, the 9# -11# pickling tank is the third zone, and the 4# pickling tank and the 8# pickling tank are used as the common pickling tank. During the zonal pickling, when the feeding material is loaded: the hoisting walking system hoists the workpiece from the station No. 1 to any station of the station No. 3-5, the workpiece is placed in a pickling tank for 8-15 minutes, and after the time reaches the set time, the workpiece in the corresponding tank is hoisted to the station No. 6 for pickling waiting; when the No. 6 station has materials: the hoisting walking system hoists the workpiece to any station of the stations 7-9 from the station 6, the workpiece is placed in a pickling tank for 8-15 minutes, and after the time reaches the set time, the workpiece in the corresponding tank is hoisted to the station 10 for pickling waiting; when the No. 10 station has materials: the lifting walking system lifts the workpiece from the station No. 10 to any station of the station No. 11 to 13, the workpiece is placed in the pickling tank for 8 to 15 minutes, and when the time reaches the set time, the lifting walking system lifts the workpiece to the next station. Through the partitioned stepping pickling, the workpiece can be sufficiently pickled in each pickling area, the pickling effect is improved, the workpiece waiting time can be reduced through the partitioned stepping pickling, the production process is smoother, the production efficiency can be greatly improved, and the equipment production capacity is improved.
In order to improve the production efficiency, the invention preferably selects two rinsing baths which are sequentially arranged along the conveying direction of the workpiece, the two rinsing baths are one-used one-standby, when the pH value of rinsing water in the rinsing baths is lower than 3, the rinsing baths are stopped, and the other rinsing bath is replaced to finish the rinsing.
When the tool hanger runs in a factory environment, zinc can be attached to the surface of the tool hanger, and when the zinc attached to the tool hanger enters a subsequent hot galvanizing process, the zinc can have adverse effects on a zinc coating of a workpiece, so that the hot galvanizing effect is influenced. In order to effectively remove zinc attached to the surface of the hanger, a pre-annealing zinc tank is arranged between a rinsing tank and an assistant plating tank, and an annealing liquid in the pre-annealing zinc tank is hydrochloric acid with the mass percentage concentration of 10% -12%.
In order to ensure that the factory area has no sour taste and no zinc smoke during production, the invention preferably completes the steps (2) to (4) in a totally closed negative pressure pickling room.
To ensure the acid mist generated in the production process to reach the standardDischarging, preferably, the acid mist in the negative pressure pickling room is captured and treated by primary water and secondary alkali liquor of an acid mist absorption tower to ensure that HCl is less than or equal to 100mg/m 3 。
In order to reduce energy consumption, the plating assisting tank is preferably heated by tail gas of a combustion system of the galvanizing tank, and the pickling tank is preferably heated by the tail gas of the combustion system of the galvanizing tank and/or waste heat of cooling water.
As shown in fig. 3-4, the equipment adopted by the process method comprises: the traveling crane comprises a feeding tank 2, a negative-pressure pickling room 3, a pickling tank 6, a rinsing tank 7, a pre-annealing zinc tank 8, a plating assisting tank 9, a pickling tool hanger return track 10, pickling tool hanger transmission equipment 11, a hoisting traveling system 12, a galvanizing tank 15, a pure water cooling tank 16, a passivation tank 17, a circular track 18, a plating removing tank 21, an acid mist absorption tower 4, deironing salt equipment 5, dedusting equipment 19 and a cooling tower 20 which are sequentially arranged in the negative-pressure pickling room 3 according to the workpiece conveying direction. Wherein, the black material hanging area is arranged below the travelling crane I1, and the areas of the feed chute 2 and the negative pressure pickling room 3 are the pretreatment areas. The feed chute 2 is arranged at the front part of the negative pressure pickling room 3, and a chain type conveying system for conveying workpieces is arranged at the position of the feed chute 2. The hoisting travelling system 12 is arranged in the negative-pressure pickling room 3 and is positioned above the pickling tank 6, the rinsing tank 7, the pre-annealing zinc tank 8 and the plating assisting tank 9, and the hoisting travelling system 12 is an electric hoist. The pickling tool hanger return track 10 is arranged on the outer side of the negative-pressure pickling room 3 and used for returning the pickling tool hanger. The pickling tool hanger transmission equipment 11 is correspondingly arranged below the pickling tool hanger return track 10 and used for conveying the pickling tool hanger, and the pickling tool hanger can be hung and unloaded through the small travelling crane 13 when returning. Each pickling tank 6 is provided with acid liquor heating equipment, preferably tail gas and/or cooling water waste heat of a combustion system of the galvanizing tank are/is adopted for heating, and steam is adopted for heating when the temperature is insufficient. The plating assisting tank 9 is provided with heating equipment, preferably tail gas of a combustion system of the galvanizing tank is used for heating, and steam is used for heating when the temperature is insufficient. The tail gas and the cooling water waste heat of the galvanizing tank combustion system are used for heating, so that the waste heat can be effectively utilized, and the energy consumption is reduced. The acid mist absorption tower 4 and the deironing salt equipment 5 are arranged outside the negative-pressure pickling room 3, the acid mist absorption tower 4 is communicated with the negative-pressure pickling room 3, the acid mist absorption tower 4 is the prior art, and the inside of the negative-pressure pickling room is provided withThe acid mist can be captured and treated by primary water and secondary alkali liquor in an acid mist absorption tower to ensure that HCl is less than or equal to 100mg/m 3 . And the workpiece subjected to acid cleaning and plating assisting enters a secondary fastening region for fastening. The galvanizing tank 15, the pure water cooling tank 16, and the passivation tank 17 are provided in this order in the workpiece conveying direction. The circular rail 18 passes through the upper part of the galvanizing tank 15, the pure water cooling tank 16, the passivation tank 17 and the deplating tank 21. The secondarily hung workpiece is conveyed into a galvanizing tank 15 through a ring rail 18 for hot galvanizing, then conveyed into a pure water cooling tank through the ring rail 18 for cooling, then conveyed into a passivation tank 17 through the ring rail 18 for passivation treatment, then conveyed to a material repairing process through the ring rail 18 for material repairing, and the workpiece entering a material repairing area is lifted through a crane III 22. And conveying the hot galvanized tool hanger to a de-plating tank through a ring rail to perform de-zinc treatment. The galvanizing bath 15 is heated by a galvanizing bath combustion system which is combusted by natural gas. The smoke generated by hot galvanizing is treated by dust removing equipment 19. The cooling water system of the cooling step is treated by a cooling tower 20.
Other parts in this embodiment are the prior art, and are not described herein again.

Claims (7)

1. A hot galvanizing process method for a coil-buckled scaffold is characterized by comprising the following steps: the method comprises the following process steps:
step (1): the black parts are fastened and hung through a tool hanger and then conveyed to the upper part of a feed chute by a travelling crane, and workpieces are conveyed to a pretreatment area through a chain type conveying system;
step (2): acid washing: conveying the workpiece forwards in a stepping manner through a lifting and walking system to pass through a plurality of pickling tanks for pickling treatment so as to remove rust and dirt on the surface of the workpiece, wherein pickling solution in the pickling tanks is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃;
and (3): washing with water: conveying the pickled workpiece step by step through a hoisting walking system to pass through a rinsing bath for rinsing;
and (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is a solution of zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the pH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃;
and (5): hot galvanizing: after being fastened for the second time, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, the temperature of the zinc liquid in the galvanizing bath is 435-;
and (6): and (3) cooling: conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃;
and (7): passivation: conveying the cooled workpiece into a passivation tank through a ring rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator;
and (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and conveying the repaired workpiece to a packaging area for packaging;
and (9): returning the tool, namely returning the hot-galvanized tool hanger to a deplating tank for deplating to remove a zinc coating on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%;
when in acid cleaning, the acid cleaning is carried out according to a subarea stepping mode, 11 acid cleaning tanks are arranged in sequence along the workpiece conveying direction and are sequentially divided into three acid cleaning areas, a common acid cleaning tank is arranged between the adjacent acid cleaning areas, the 1 st to the 3 rd acid cleaning tanks are first acid cleaning areas, the 5 th to the 7 th acid cleaning tanks are second acid cleaning areas, the 9 th to the 11 th acid cleaning tanks are third acid cleaning areas, the 4 th acid cleaning tank and the 8 th acid cleaning tank are common acid cleaning tanks, the mass percentage concentration of the acid cleaning solution in the acid cleaning tank of the first acid cleaning area is 6-10%, the mass percentage concentration of the acid cleaning solution in the acid cleaning tank of the second acid cleaning area is 13-16%, the mass percentage concentration of the acid cleaning solution in the acid cleaning tank of the third acid cleaning area is 18-20%, when in subareas, when a feeding position has materials, the hoisting travelling system hoists the workpiece to any one of the 1 st to the 3 rd acid cleaning tanks, placing the workpiece in the pickling tank for 8-15 minutes, and hoisting the workpiece in the pickling tank to a 4 th pickling tank for pickling after the time reaches a set time; when the material exists in the 4 th pickling tank, the lifting walking system lifts the workpiece from the 4 th pickling tank to any one of the 5 th to 7 th pickling tanks, the workpiece is placed in the pickling tank for 8 to 15 minutes, and after the time reaches the set time, the workpiece in the pickling tank is lifted to the 8 th pickling tank for pickling waiting; when the pickling tank 8 is filled with materials, the lifting and walking system lifts the workpiece from the pickling tank 8 to any pickling tank from the pickling tank 9 to the pickling tank 11, the workpiece is placed in the pickling tank for 8-15 minutes, and when the time reaches the set time, the lifting and walking system lifts the workpiece to the next station.
2. The hot galvanizing process method for the disc scaffold according to the claim 1, which is characterized in that: two rinsing baths are sequentially arranged along the conveying direction of the workpiece, one rinsing bath is used, the other rinsing bath is stopped when the pH value of rinsing water in the rinsing bath is lower than 3, and the other rinsing bath is replaced to finish water washing.
3. The hot galvanizing process method for the disc scaffold according to claim 1, which is characterized in that: a pre-zinc-stripping tank is arranged between the rinsing tank and the plating assisting tank, and the stripping liquid in the pre-zinc-stripping tank is hydrochloric acid with the mass percentage concentration of 10% -12%.
4. A hot galvanizing process for a coil scaffold according to claim 1, 2 or 3, characterized in that: and (3) finishing the steps (2) and (4) in a fully-closed negative-pressure pickling room.
5. The hot galvanizing process for the disc scaffold according to claim 4, which is characterized in that: the acid mist in the negative pressure pickling room is captured and treated by the primary water and the secondary alkali liquor of the acid mist absorption tower, so that HCl is less than or equal to 100mg/m 3 。
6. The hot galvanizing process for the disc scaffold according to claim 4, which is characterized in that: the plating assisting tank is heated by tail gas of a combustion system of the galvanizing tank.
7. The hot galvanizing process for the disc scaffold according to claim 4, which is characterized in that: the pickling tank is heated by tail gas of a combustion system of the galvanizing tank and/or waste heat of cooling water.
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