CN107723641A - The hot-dipping method of corrosion-resistant coating - Google Patents
The hot-dipping method of corrosion-resistant coating Download PDFInfo
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- CN107723641A CN107723641A CN201710817108.3A CN201710817108A CN107723641A CN 107723641 A CN107723641 A CN 107723641A CN 201710817108 A CN201710817108 A CN 201710817108A CN 107723641 A CN107723641 A CN 107723641A
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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
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/26—After-treatment
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present invention relates to a kind of hot-dipping method of corrosion-resistant coating.A kind of hot-dipping method of corrosion-resistant coating, comprises the following steps：Workpiece is carried out using quickening liquid to help plating；Processing is dried to the workpiece after helping plating again；The workpiece after drying process is placed in the zinc liquid of melting and carries out zinc-plated processing；Prepared by zinc-aluminium layer to the workpiece surface Jing Guo zinc-plated processing, the zinc-aluminium layer includes as mass fraction：70%~85% zinc, 5%~15% aluminium and 5%~15% chromium；And prepare resin bed on the aluminium zinc layer surface.The hot-dipping method of above-mentioned corrosion-resistant coating, zinc-aluminium layer is further coated in the workpiece surface Jing Guo zinc-plated processing, zinc-aluminium layer includes zinc, aluminium and chromium, and it is equipped with certain proportioning, the antiseptic property of raising coating while the adhesive force of zinc can be ensured, and the corrosion resistance of the surface coated with resins layer enhancing workpiece in workpiece, to meet the harsh use environment such as subway, tunnel and underground pipe gallery.
Description
Technical field
The present invention relates to hot plating technology, more particularly to the hot-dipping method of corrosion-resistant coating.
Background technology
Galvanizing or galvanizing by dipping are also in galvanizing, are a kind of effective method of preventing corrosion of metals, are mainly used in every profession and trade
Metal structure facility on.Workpiece is mainly immersed in the zinc liquid of thawing by hot dip galvanizing process so that the surface attachment of workpiece
Zinc layers, so as to play corrosion-resistant purpose.However, application of the metal works in subway, tunnel and underground pipe gallery at present
It is more and more extensive, however it is typically darker, moist in above-mentioned environment, and workpiece is more easy to that corrosion and damage occurs, so as to cause very
Multiple-project hidden danger.Therefore, current hot dip galvanizing process anti-corrosion can not meet to require, it is preferably hot to be badly in need of exploration antiseptic property
Electroplating method.
The content of the invention
Based on this, it is necessary to the problem of the workpiece antiseptic property deficiency obtained for current hot dip galvanizing process, there is provided a kind of
The hot-dipping method of corrosion-resistant coating.
A kind of hot-dipping method of corrosion-resistant coating, the hot-dipping method of the corrosion-resistant coating comprise the following steps：
Workpiece is carried out using quickening liquid to help plating；
Processing is dried to the workpiece after helping plating again；
The workpiece after drying process is placed in the zinc liquid of melting and carries out zinc-plated processing；
Prepared by zinc-aluminium layer to the workpiece surface Jing Guo zinc-plated processing, the zinc-aluminium layer includes as mass fraction：
70%~85% zinc, 5%~15% aluminium and 5%~15% chromium；And
Resin bed is prepared on the aluminium zinc layer surface.
In a wherein embodiment, also wrapped before described the step of carrying out helping plating to workpiece using quickening liquid
Include step：
Ungrease treatment is carried out to the workpiece by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil；
The workpiece is washed；And
Pickling is carried out to the workpiece.
It is described by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil pair in a wherein embodiment
The workpiece was carried out in the step of ungrease treatment, and ungrease treatment is carried out using degreasing agent, in the degreasing agent containing 30g/L~
50g/L NaOH, 20g/L~30g/L Na2CO3, 50g/L~70g/L Na3PO4·12H2O's and 10g/L~15g/L
Na2SiO3, the solvent of the degreasing agent is water；The temperature of the ungrease treatment is 80 DEG C~100 DEG C.
It is described by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil pair in a wherein embodiment
The workpiece was carried out in the step of ungrease treatment, and ungrease treatment is carried out using electrolyte, in the electrolyte containing 15g/L~
20g/L NaOH, 20g/L~30g/L Na2CO3, 50g/L~70g/L Na3PO4·12H2O's and 5g/L~10g/L
Na2SiO3, the solvent of the electrolyte is water；The temperature of the ungrease treatment is 70 DEG C~90 DEG C；The electricity during ungrease treatment
Current density is 10A/dm2~15A/dm2。
In a wherein embodiment, in described the step of carrying out pickling to the workpiece, acid is carried out using pickle
Wash, the pickle includes as mass fraction：13%~20% H2SO4, 0.1%~0.5% thiocarbamide and the water of surplus；
Or, in described the step of carrying out pickling to the workpiece, pickling is carried out using pickle, the pickle presses quality
Fraction meter includes：20%~42% HCl, 4%~5% methenamine and surplus water.
In a wherein embodiment, the quickening liquid includes 100g/L~150g/L NH4Cl and 150g/L~
180g/L ZnCl2, the solvent of the fluxing agent is water；The time for helping plating is 1min~2min；It is described to help at plating
The temperature of reason is 70 DEG C~80 DEG C.
In a wherein embodiment, the workpiece by after drying process is placed in the zinc liquid of melting and plated
In the step of zinc processing, the temperature of the zinc liquid is 450 DEG C~470 DEG C, time of the zinc-plated processing for 0.5min~
1.5min。
In a wherein embodiment, to the workpiece system Jing Guo zinc-plated processing by the way of dip-coating centrifugal treating
Standby zinc-aluminium layer, the time impregnated during the dip-coating centrifugal treating be 10s~30s, the rotating speed of centrifugal treating be 210rpm~
300rpm, the time of centrifugal treating is 10s~30s.
In a wherein embodiment, the step of described pair of workpiece surface Jing Guo zinc-plated processing prepares zinc-aluminium layer
Repeat 2 times~5 times.
In a wherein embodiment, the material of the resin bed is epoxy resin；The thickness of the resin bed is 3 μm
~5 μm.
The hot-dipping method of above-mentioned corrosion-resistant coating, zinc-aluminium layer, zinc are further coated in the workpiece surface Jing Guo zinc-plated processing
Aluminium lamination includes zinc, aluminium and chromium, and is equipped with certain proportioning, can ensure to improve the anti-corrosive properties of coating while the adhesive force of zinc
Can, and the corrosion resistance of the surface coated with resins layer enhancing workpiece in workpiece, to meet subway, tunnel and underground pipe gallery etc.
Harsh use environment.
Brief description of the drawings
Fig. 1 is the process chart of the hot-dipping method of the corrosion-resistant coating of an embodiment.
Embodiment
The hot-dipping method of corrosion-resistant coating is described in further detail below in conjunction with embodiment and accompanying drawing.
Referring to Fig. 1, the hot-dipping method of the corrosion-resistant coating of an embodiment, comprises the following steps：
S110, ungrease treatment is carried out to workpiece by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil.
In a wherein embodiment, to described by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil
Workpiece was carried out in the step of ungrease treatment, carries out ungrease treatment using degreasing agent, degreasing agent is cleaned to workpiece.It can adopt
Workpiece is cleaned with the mode of spray or dipping.
In a wherein embodiment, NaOH, 20g/L containing 30g/L~50g/L~30g/L in degreasing agent
Na2CO3, 50g/L~70g/L Na3PO4·12H2O and 10g/L~15g/L Na2SiO3, the solvent of degreasing agent is water.
In a wherein embodiment, temperature during above-mentioned degreasing agent progress ungrease treatment is used as 80 DEG C~100 DEG C.
In other embodiments, to the workpiece by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil
In the step of carrying out ungrease treatment, ungrease treatment is carried out using electrolyte.
In a wherein embodiment, NaOH, 20g/L containing 15g/L~20g/L~30g/L in electrolyte
Na2CO3, 50g/L~70g/L Na3PO4·12H2O and 5g/L~10g/L Na2SiO3, the solvent of electrolyte is water.
In a wherein embodiment, temperature during above-mentioned electrolyte progress ungrease treatment is used as 70 DEG C~90 DEG C.
Current density during above-mentioned electrolyte progress ungrease treatment is used as 10A/dm2~15A/dm2。
S120, workpiece is washed.
In a wherein embodiment, workpiece is washed 2 times~5 times, to cause the degreasing agent or electrolyte on workpiece
It is cleaned.
S130, pickling is carried out to workpiece.
In a wherein embodiment, workpiece is immersed in pickle when carrying out pickling to workpiece, with workpiece of going out
The oxide of the iron on surface.
In a wherein embodiment, pickle includes as mass fraction：13%~20% H2SO4, 0.1%~
0.5% thiocarbamide and the water of surplus.
Use above-mentioned pickle to carry out during pickling temperature to workpiece as 40 DEG C~60 DEG C, time of pickling be 8min~
10min。
In another embodiment, pickle includes as mass fraction：20%~42% HCl, 4%~5%
Methenamine and surplus water.
Use above-mentioned pickle to carry out during pickling temperature to workpiece as 20 DEG C~40 DEG C, time of pickling be 10min~
30min。
S140, using quickening liquid workpiece is carried out helping plating.
It is to be immersed in workpiece to help plating in a wherein embodiment, when carrying out to workpiece using quickening liquid and help plating
Handled in liquid.
In a wherein embodiment, the solute of quickening liquid includes 100g/L~150g/L NH4Cl and 150g/L~
180g/L ZnCl2, solvent is water.
In a wherein embodiment, it is 70 DEG C~80 DEG C help temperature during plating；Help the time of plating
For 1min~2min.
To workpiece help plating can increase during follow-up zinc-plated processing zinc in workpiece surface using quickening liquid
Adhesive force.
S150, processing is dried to the workpiece after helping plating.
In a wherein embodiment, dried at a temperature of the workpiece after helping plating is placed in into 80 DEG C~140 DEG C
Intervene heat.
S160, the workpiece after drying process is placed in the zinc liquid of melting carries out zinc-plated processing.
In a wherein embodiment, the temperature of zinc liquid is 450 DEG C~470 DEG C, and the time of zinc-plated processing is 0.5min
~1.5min.
In a wherein embodiment, zinc content is 99.995% in zinc liquid.
In a wherein embodiment, workpiece surface forms the zinc that thickness is 55 μm~70 μm after zinc-plated processing
Layer.
S170, workpiece surface is arranged.
In a wherein embodiment, after the workpiece cooling after zinc-plated processing, workpiece surface is arranged,
To remove the remaining zinc of workpiece surface or list edge.
In a wherein embodiment, workpiece surface is arranged to ensure the surface roughness of workpiece, process is whole
The surface roughness Ra of workpiece after reason is 12.5~25.
S180, prepared by zinc-aluminium layer to the workpiece surface Jing Guo zinc-plated processing.
In a wherein embodiment, zinc-aluminium layer includes as mass fraction：70%~85% zinc, 5%~15%
Aluminium and 5%~15% chromium.
In a wherein embodiment, to the workpiece coating zinc Jing Guo zinc-plated processing by the way of dip-coating centrifugal treating
Aluminium lamination.
The time impregnated in a wherein embodiment, during dip-coating centrifugal treating is 10s~30s, and centrifugal treating turns
Speed is 210rpm~300rpm, and the time of centrifugal treating is 10s~30s.Centrifugal treating is carried out to the workpiece after dip-coating to remove
The unnecessary liquid of workpiece surface, avoid hydrops from remaining on workpiece and cause Aluminum Coating out-of-flatness and influence workpiece performance.
In a wherein embodiment, when coating zinc-aluminium layer, the temperature of zinc-aluminium coating liquid is 320 DEG C~340 DEG C.
In a wherein embodiment, the thickness of zinc-aluminium layer is 3~5 μm.
It can ensure the adhesive force of zinc in the workpiece surface coating zinc-aluminium layer Jing Guo zinc-plated processing, and increase the thickness of coating
Degree, and the zinc-aluminium layer formed can also play preferable corrosion-resistant effect, and the zinc-aluminium layer coated also can guarantee that the light of workpiece surface
Slippery.
In a wherein embodiment, step S180 repeats 2 times~5 times
In a wherein embodiment, if step S180 repeats n times, n is the arbitrary integer in 2~5, then the 1st
During the secondary progress step S180 of~(n-1), it will coat at a temperature of the workpiece after zinc-aluminium layer is placed in 320 DEG C~340 DEG C and toasted,
The time of baking is 30min~35min；N-th carry out step S180 when, by coat zinc-aluminium thickness workpiece be placed in 200 DEG C~
Toasted at a temperature of 220 DEG C, the time of baking is 30min~50min.
S190, the surface to zinc-aluminium layer prepare resin bed.
In a wherein embodiment, using epoxy resin to dried workpiece coating resin bed；The thickness of resin bed
Spend for 3 μm~5 μm.
In a wherein embodiment, the viscosity of epoxy resin is 6Pas~40Pas, the softening point of epoxy resin
For 21 DEG C~155 DEG C, the epoxide number of epoxy resin is 0.01~0.55.
In a wherein embodiment, to workpiece coating resin bed by the way of dip-coating centrifugal treating.
The time impregnated in a wherein embodiment, during dip-coating centrifugal treating is 10s~30s, and centrifugal treating turns
Speed is 210rpm~300rpm, and the time of centrifugal treating is 10s~30s.
Coated with resins layer causes workpiece to have anti-chemical agent and anti acid alkali performance on workpiece, and resin bed can strengthen corrosion resistant
Corrosion, resin bed also can carry out sealing of hole to workpiece, further prevent workpiece to be corroded.
The hot-dipping method of above-mentioned corrosion-resistant coating, zinc-aluminium layer, zinc are further coated in the workpiece surface Jing Guo zinc-plated processing
Aluminium lamination includes zinc, aluminium and chromium, and is equipped with certain proportioning, can ensure to improve the anti-corrosive properties of coating while the adhesive force of zinc
Can, and the corrosion resistance of the surface coated with resins layer enhancing workpiece in workpiece, to meet subway, tunnel and underground pipe gallery etc.
Harsh use environment.
Here is the explanation of specific embodiment, and following examples unless otherwise specified, are not then contained except inevitably miscellaneous
The component pointed out is not known in other beyond matter.
Embodiment 1
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein, degreasing agent includes 30g/L NaOH, 30g/L
Na2CO3, 50g/L Na3PO4·12H2O and 15g/L Na2SiO3, solvent is water, and the temperature of ungrease treatment is 80 DEG C.
(2) workpiece is washed 2 times.
(3) pickling is carried out to workpiece, wherein, pickle includes as mass fraction：13% H2SO4, 0.5% thiocarbamide
And the water of surplus, temperature during pickling is 40 DEG C, and the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein, the solute of quickening liquid includes 100g/L NH4Cl and
180g/L ZnCl2, solvent is water, and the temperature for helping plating is 70 DEG C, and the time for helping plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and preheated.
(6) workpiece is placed in 450 DEG C of zinc liquid and carries out zinc-plated processing, the time of zinc-plated processing is 1.5min, formation
The thickness of zinc layers is 70 μm.
(7) it is 25 workpiece surface to be carried out arranging the remaining zinc for removing surface or list edge to the roughness Ra of workpiece surface.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, then zinc-aluminium layer is formed in workpiece surface by centrifugal treating,
Wherein zinc-aluminium coating liquid includes 70% zinc, 15% aluminium and 15% chromium, then workpiece is carried out being baked to workpiece and dried, and is formed
Zinc-aluminium layer thickness be 5 μm；
Repeat aforesaid operations (8) twice, temperature when workpiece is toasted for the first time is 320 DEG C, and the time of baking is
30min, temperature when workpiece is toasted for the second time is 200 DEG C, and the time of baking is 30min.
(9) resin bed is prepared on the surface of zinc-aluminium layer using epoxy resin, wherein, the thickness of resin bed is 3 μm.
Embodiment 2
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein, degreasing agent includes 50g/L NaOH, 20g/L
Na2CO3, 70g/L Na3PO4·12H2O and 10g/L Na2SiO3, solvent is water, and the temperature of ungrease treatment is 100 DEG C.
(2) workpiece is washed 5 times.
(3) pickling is carried out to workpiece, wherein, pickle includes as mass fraction：13% H2SO4, 0.5% thiocarbamide
And the water of surplus, temperature during pickling is 40 DEG C, and the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein, the solute of quickening liquid includes 150g/L NH4Cl and
150g/L ZnCl2, solvent is water, and the temperature for helping plating is 80 DEG C, and the time for helping plating is 1min.
(5) workpiece is placed in dry at 140 DEG C and preheated.
(6) workpiece is placed in 470 DEG C of zinc liquid and carries out zinc-plated processing, the time of zinc-plated processing is 0.5min, formation
The thickness of zinc layers is 55 μm.
(7) it is 12.5 workpiece surface to be carried out arranging the remaining zinc for removing surface or list edge to the roughness Ra of workpiece surface.
(8) workpiece is placed in 340 DEG C of zinc-aluminium coating liquid, then zinc-aluminium layer is formed in workpiece surface by centrifugal treating,
Wherein zinc-aluminium coating liquid includes 85% zinc, 5% aluminium and 10% chromium, then workpiece is carried out being baked to workpiece and dried, and is formed
Zinc-aluminium layer thickness be 3 μm；
Repeat aforesaid operations (8) three times, temperature when for the first time and second is toasted workpiece is 320 DEG C, baking
Time be 30min, temperature when workpiece is toasted for the third time be 200 DEG C, the time of baking is 30min.
(9) resin bed is prepared on the surface of zinc-aluminium layer using epoxy resin, wherein, the thickness of resin bed is 3 μm.
Embodiment 3
(1) ungrease treatment is carried out to workpiece by the way of water-base metal degreased cleaning agent deoils, wherein, electrolyte includes
15g/L NaOH, 30g/L Na2CO3, 50g/L Na3PO4·12H2O and 10g/L Na2SiO3, solvent is water, at degreasing
The temperature of reason is 70 DEG C, and current density during ungrease treatment is 15A/dm2。
(2) workpiece is washed 5 times.
(3) pickling is carried out to workpiece, wherein, pickle includes as mass fraction：15% H2SO4, 0.1% thiocarbamide
And the water of surplus, temperature during pickling is 40 DEG C, and the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein, the solute of quickening liquid includes 130g/L NH4Cl and
170g/L ZnCl2, solvent is water, and the temperature for helping plating is 75 DEG C, and the time for helping plating is 2min.
(5) workpiece is placed in dry at 100 DEG C and preheated.
(6) workpiece is placed in 450 DEG C of zinc liquid and carries out zinc-plated processing, the time of zinc-plated processing is 1.5min, formation
The thickness of zinc layers is 70 μm.
(7) it is 25 workpiece surface to be carried out arranging the remaining zinc for removing surface or list edge to the roughness Ra of workpiece surface.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, then zinc-aluminium layer is formed in workpiece surface by centrifugal treating,
Wherein zinc-aluminium coating liquid includes 80% zinc, 10% aluminium and 10% chromium, then workpiece is carried out being baked to workpiece and dried, and is formed
Zinc-aluminium layer thickness be 4 μm；
Repeat aforesaid operations (8) five times, temperature when workpiece is toasted to the 4th time for the first time is 320 DEG C, baking
Time be 30min, temperature when the 5th time workpiece is toasted is 200 DEG C, and the time of baking is 50min.
(9) resin bed is prepared on the surface of zinc-aluminium layer using epoxy resin, wherein, the thickness of resin bed is 5 μm.
Embodiment 4
(1) ungrease treatment is carried out to workpiece by the way of water-base metal degreased cleaning agent deoils, wherein, electrolyte includes
20g/L NaOH, 20g/L Na2CO3, 70g/L Na3PO4·12H2O and 5g/L Na2SiO3, solvent is water, ungrease treatment
Temperature be 90 DEG C, current density during ungrease treatment is 10A/dm2。
(2) workpiece is washed 3 times.
(3) pickling is carried out to workpiece, wherein, pickle includes as mass fraction：13% H2SO4,0.2% thiocarbamide
And the water of surplus, temperature during pickling is 60 DEG C, and the time of pickling is 9min.
(4) workpiece is carried out to help plating using quickening liquid, wherein, the solute of quickening liquid include 100g/L NH4Cl and
180g/L ZnCl2, solvent are water, and the temperature for helping plating is 70 DEG C, and the time for helping plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and preheated.
(6) workpiece is placed in 450 DEG C of zinc liquid and carries out zinc-plated processing, the time of zinc-plated processing is 1.5min, formation
The thickness of zinc layers is 70 μm.
(7) it is 12.5 workpiece surface to be carried out arranging the remaining zinc for removing surface or list edge to the roughness Ra of workpiece surface.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, then zinc-aluminium layer is formed in workpiece surface by centrifugal treating,
Wherein zinc-aluminium coating liquid includes 85% zinc, 10% aluminium and 5% chromium, then workpiece is carried out being baked to workpiece and dried, and is formed
Zinc-aluminium layer thickness be 5 μm；
Repeat aforesaid operations (8) twice, temperature when workpiece is toasted for the first time is 320 DEG C, and the time of baking is
30min, temperature when workpiece is toasted for the second time is 200 DEG C, and the time of baking is 30min.
(9) resin bed is prepared on the surface of zinc-aluminium layer using epoxy resin, wherein, the thickness of resin bed is 3 μm.
Embodiment 5
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein, degreasing agent includes 30g/L NaOH, 30g/L
Na2CO3, 50g/L Na3PO4·12H2O and 15g/L Na2SiO3, solvent is water, and the temperature of ungrease treatment is 80 DEG C.
(2) workpiece is washed 2 times.
(3) pickling is carried out to workpiece, wherein, pickle includes as mass fraction：13% H2SO4, 0.5% thiocarbamide
And the water of surplus, temperature during pickling is 40 DEG C, and the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein, the solute of quickening liquid includes 100g/L NH4Cl and
180g/L ZnCl2, solvent is water, and the temperature for helping plating is 70 DEG C, and the time for helping plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and preheated.
(6) workpiece is placed in 450 DEG C of zinc liquid and carries out zinc-plated processing, the time of zinc-plated processing is 1.5min, formation
The thickness of zinc layers is 70 μm.
(7) it is 12.5 workpiece surface to be carried out arranging the remaining zinc for removing surface or list edge to the roughness Ra of workpiece surface.
The workpiece that the hot-dipping method of the corrosion-resistant coating of embodiment 1~5 is prepared carries out neutral salt spray test, as a result
As shown in table 1.Wherein, neutral salt spray test is carried out according to method of the state marked as GB/T10125-2012, and spray chamber's temperature is
35 DEG C, NaCl concentration 50g/L, salt solution pH value is 7.0.
Workpiece is can be seen that in the technical scheme of embodiment 1~4 in neutral salt spray test from the data of embodiment 1~5
Decay resistance substantially increase, still there is preferable outward appearance after the test of 2400 hours.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of hot-dipping method of corrosion-resistant coating, it is characterised in that the hot-dipping method of the corrosion-resistant coating includes following step
Suddenly：
Workpiece is carried out using quickening liquid to help plating；
Processing is dried to the workpiece after helping plating again；
The workpiece after drying process is placed in the zinc liquid of melting and carries out zinc-plated processing；
Prepared by zinc-aluminium layer to the workpiece surface Jing Guo zinc-plated processing, the zinc-aluminium layer includes as mass fraction：70%~
85% zinc, 5%~15% aluminium and 5%~15% chromium；And
Resin bed is prepared on the aluminium zinc layer surface.
2. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that use quickening liquid to work described
Also include step before the step of part carries out helping plating：
Ungrease treatment is carried out to the workpiece by the way of chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil；
The workpiece is washed；And
Pickling is carried out to the workpiece.
3. the hot-dipping method of corrosion-resistant coating according to claim 2, it is characterised in that described to use chemical deoiling and degreasing or water
In the step of mode that Base Metal degreased cleaning agent deoils carries out ungrease treatment to the workpiece, carried out using degreasing agent at degreasing
Manage, NaOH, 20g/L containing 30g/L~50g/L~30g/L Na in the degreasing agent2CO3, 50g/L~70g/L
Na3PO4·12H2O and 10g/L~15g/L Na2SiO3, the solvent of the degreasing agent is water；The temperature of the ungrease treatment is
80 DEG C~100 DEG C.
4. the hot-dipping method of corrosion-resistant coating according to claim 2, it is characterised in that described to use chemical deoiling and degreasing or water
In the step of mode that Base Metal degreased cleaning agent deoils carries out ungrease treatment to the workpiece, carried out using electrolyte at degreasing
Manage, NaOH, 20g/L containing 15g/L~20g/L~30g/L Na in the electrolyte2CO3, 50g/L~70g/L
Na3PO4·12H2O and 5g/L~10g/L Na2SiO3, the solvent of the electrolyte is water；The temperature of the ungrease treatment is
70 DEG C~90 DEG C；The current density during ungrease treatment is 10A/dm2~15A/dm2。
5. the hot-dipping method of corrosion-resistant coating according to claim 2, it is characterised in that described that acid is carried out to the workpiece
In the step of washing, pickling is carried out using pickle, the pickle includes as mass fraction：13%~20% H2SO4、
0.1%~0.5% thiocarbamide and the water of surplus；
Or, in described the step of carrying out pickling to the workpiece, pickling is carried out using pickle, the pickle presses mass fraction
Meter includes：20%~42% HCl, 4%~5% methenamine and surplus water.
6. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that the quickening liquid includes
100g/L~150g/L NH4Cl and 150g/L~180g/L ZnCl2, the solvent of the fluxing agent is water；It is described to help plating
Time be 1min~2min；The temperature for helping plating is 70 DEG C~80 DEG C.
7. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that the institute by after drying process
State workpiece to be placed in the zinc liquid of melting in the step of carrying out zinc-plated processing, the temperature of the zinc liquid is 450 DEG C~470 DEG C, described
The time of zinc-plated processing is 0.5min~1.5min.
8. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that using the side of dip-coating centrifugal treating
Formula prepares zinc-aluminium layer to the workpiece Jing Guo zinc-plated processing, and the time impregnated during the dip-coating centrifugal treating is 10s~30s,
The rotating speed of centrifugal treating is 210rpm~300rpm, and the time of centrifugal treating is 10s~30s.
9. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that described pair by zinc-plated processing
The step of workpiece surface prepares zinc-aluminium layer repeats 2 times~5 times.
10. the hot-dipping method of corrosion-resistant coating according to claim 1, it is characterised in that the material of the resin bed is
Epoxy resin；The thickness of the resin bed is 3 μm~5 μm.
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| CN115704077A (en) * | 2021-08-12 | 2023-02-17 | 江苏华能电缆股份有限公司 | Zinc-aluminum hot-dip process for armored steel wire of load-bearing detection cable |
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