CN107723641B - The hot-dipping method of corrosion-resistant coating - Google Patents
The hot-dipping method of corrosion-resistant coating Download PDFInfo
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- CN107723641B CN107723641B CN201710817108.3A CN201710817108A CN107723641B CN 107723641 B CN107723641 B CN 107723641B CN 201710817108 A CN201710817108 A CN 201710817108A CN 107723641 B CN107723641 B CN 107723641B
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Electroplating Methods And Accessories (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present invention relates to a kind of hot-dipping methods of corrosion-resistant coating.A kind of hot-dipping method of corrosion-resistant coating, comprising the following steps: workpiece is carried out using quickening liquid to help plating；The workpiece after helping plating is dried 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 include: as mass fraction 70%~85% zinc, 5%~15% aluminium and 5%~15% chromium；And resin layer is prepared 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 proportion, it can guarantee the antiseptic property that coating is improved while the adhesive force of zinc, and in the corrosion resistance of the surface coated with resins layer of workpiece enhancing 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 technologies, more particularly to the hot-dipping method of corrosion-resistant coating.
Background technique
Galvanizing or galvanizing by dipping are also in hot galvanizing, are a kind of effective method of preventing corrosion of metals, are mainly used for 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 of workpiece is adhered to
Zinc layers, 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 generally darker, moist in above-mentioned environment, and workpiece is easier to that corrosion and damage occurs, to cause very
Multiple-project hidden danger.Therefore, current hot dip galvanizing process anti-corrosion is no longer satisfied requirement, and it is preferably hot to be badly in need of exploration antiseptic property
Electroplating method.
Summary of the invention
Based on this, it is necessary to for the problem for the workpiece antiseptic property deficiency that current hot dip galvanizing process obtains, provide one kind
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 the following steps are included:
Workpiece is carried out using quickening liquid to help plating；
The workpiece after helping plating is dried 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 layer is prepared on the aluminium zinc layer surface.
In a wherein embodiment, also wrapped before the use quickening liquid carries out the step of helping plating to workpiece
Include step:
Ungrease treatment is carried out to the workpiece in such a way that 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 in such a way that chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil pair in a wherein embodiment
The workpiece carried out in the step of ungrease treatment, carried out ungrease treatment using degreasing agent, in the degreasing agent containing 30g/L~
NaOH, 20g/L of 50g/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 in such a way that chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil pair in a wherein embodiment
The workpiece carried out in the step of ungrease treatment, carried out ungrease treatment using electrolyte, in the electrolyte containing 15g/L~
NaOH, 20g/L of 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 when 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 pickling solution
It washes, the pickling solution includes: 13%~20% H as mass fraction2SO4, 0.1%~0.5% thiocarbamide and the water of surplus；
Or, carrying out pickling using pickling solution, the pickling solution presses quality in described the step of carrying out pickling to the workpiece
Score meter includes: the water of 20%~42% HCl, 4%~5% methenamine and surplus.
In a wherein embodiment, including the NH of 100g/L~150g/L in the quickening liquid4Cl and 150g/L~
The ZnCl of 180g/L2, 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, which is placed in the zinc liquid of melting, to be plated
In the step of zinc processing, the temperature of the zinc liquid is 450 DEG C~470 DEG C, the time of the zinc-plated processing be 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 that when dip-coating centrifugal treating impregnates are 10s~30s, the revolving speed of centrifugal treating be 210rpm~
300rpm, the time of centrifugal treating are 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 layer is epoxy resin；The resin layer with a thickness of 3 μm
~5 μm.
The hot-dipping method of above-mentioned corrosion-resistant coating further coats zinc-aluminium layer, zinc in the workpiece surface Jing Guo zinc-plated processing
Aluminium layer includes zinc, aluminium and chromium, and is equipped with certain proportion, can guarantee the anti-corrosive properties that coating is improved while the adhesive force of zinc
Can, and in the corrosion resistance of the surface coated with resins layer of workpiece enhancing workpiece, to meet subway, tunnel and underground pipe gallery etc.
Harsh use environment.
Detailed description of the invention
Fig. 1 is the process flow chart of the hot-dipping method of the corrosion-resistant coating of an embodiment.
Specific embodiment
The hot-dipping method of corrosion-resistant coating is described in further detail below in conjunction with specific embodiment and attached drawing.
Referring to Fig. 1, the hot-dipping method of the corrosion-resistant coating of an embodiment, comprising the following steps:
S110, ungrease treatment is carried out to workpiece in such a way that chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil.
In a wherein embodiment, to described in such a way that chemical deoiling and degreasing or water-base metal degreased cleaning agent deoil
Workpiece carried out in the step of ungrease treatment, carries out ungrease treatment using degreasing agent, degreasing agent cleans workpiece.It can adopt
Workpiece is cleaned with the mode of spray or dipping.
NaOH, 20g/L~30g/L in a wherein embodiment, in degreasing agent containing 30g/L~50g/L
Na2CO3, 50g/L~70g/L Na3PO4·12H2The Na of O and 10g/L~15g/L2SiO3, the solvent of degreasing agent is water.
In a wherein embodiment, temperature when above-mentioned degreasing agent being used to carry out ungrease treatment is 80 DEG C~100 DEG C.
In other embodiments, to the workpiece in such a way that 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.
NaOH, 20g/L~30g/L in a wherein embodiment, in electrolyte containing 15g/L~20g/L
Na2CO3, 50g/L~70g/L Na3PO4·12H2The Na of O and 5g/L~10g/L2SiO3, the solvent of electrolyte is water.
In a wherein embodiment, temperature when above-mentioned electrolyte being used to carry out ungrease treatment is 70 DEG C~90 DEG C.
Current density when above-mentioned electrolyte being used to carry out ungrease treatment is 10A/dm2~15A/dm2。
S120, workpiece is washed.
In a wherein embodiment, workpiece is washed 2 times~5 times, so that degreasing agent or electrolyte on workpiece
It is cleaned.
S130, pickling is carried out to workpiece.
In a wherein embodiment, workpiece is immersed in pickling solution when carrying out pickling to workpiece, with workpiece of going out
The oxide of the iron on surface.
In a wherein embodiment, pickling solution includes: 13%~20% H as mass fraction2SO4, 0.1%~
0.5% thiocarbamide and the water of surplus.
Temperature is 40 DEG C~60 DEG C when above-mentioned pickling solution being used to carry out pickling to workpiece, time of pickling for 8min~
10min。
In another embodiment, pickling solution include: as mass fraction 20%~42% HCl, 4%~5%
Methenamine and surplus water.
Temperature is 20 DEG C~40 DEG C when above-mentioned pickling solution being used to carry out pickling to workpiece, time of pickling for 10min~
30min。
S140, workpiece is carried out using quickening liquid to help 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
It is handled in liquid.
In a wherein embodiment, the solute of quickening liquid includes the NH of 100g/L~150g/L4Cl and 150g/L~
The ZnCl of 180g/L2, solvent is water.
In a wherein embodiment, help temperature when plating is 70 DEG C~80 DEG C；Help the time of plating
For 1min~2min.
Help plating that can increase during subsequent zinc-plated processing zinc in workpiece surface workpiece using quickening liquid
Adhesive force.
S150, the workpiece after helping plating is dried.
In a wherein embodiment, the workpiece after helping plating is placed at a temperature of 80 DEG C~140 DEG C and is dried
Intervene heat.
S160, it 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 is formed with a thickness of 55 μm~70 μm of zinc 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 or list edge of workpiece surface.
In a wherein embodiment, the surface roughness to guarantee workpiece is arranged to workpiece surface, 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 include: 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 layer.
In a wherein embodiment, the time that when dip-coating centrifugal treating impregnates 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 remove to the workpiece after dip-coating
The extra liquid of workpiece surface avoids hydrops from remaining on workpiece and causes 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, zinc-aluminium layer with a thickness of 3~5 μm.
It can guarantee 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 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
When the secondary progress step S180 of~(n-1), the workpiece after zinc-aluminium layer will be coated it is placed at a temperature of 320 DEG C~340 DEG C and toast,
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~
It is toasted at a temperature of 220 DEG C, the time of baking is 30min~50min.
S190, prepared by resin layer to the surface of zinc-aluminium layer.
In a wherein embodiment, using epoxy resin to the workpiece coating resin layer after drying；The thickness of resin layer
Degree is 3 μm~5 μm.
In a wherein embodiment, the viscosity of epoxy resin is 6Pas~40Pas, the softening point of epoxy resin
It is 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 layer by the way of dip-coating centrifugal treating.
In a wherein embodiment, the time that when dip-coating centrifugal treating impregnates is 10s~30s, and centrifugal treating turns
Speed is 210rpm~300rpm, and the time of centrifugal treating is 10s~30s.
Coated with resins layer makes workpiece have anti-chemical agent and anti acid alkali performance on workpiece, and resin layer can enhance corrosion resistant
Corrosion, resin layer also can carry out sealing of hole to workpiece, workpiece further prevented to be corroded.
The hot-dipping method of above-mentioned corrosion-resistant coating further coats zinc-aluminium layer, zinc in the workpiece surface Jing Guo zinc-plated processing
Aluminium layer includes zinc, aluminium and chromium, and is equipped with certain proportion, can guarantee the anti-corrosive properties that coating is improved while the adhesive force of zinc
Can, and in the corrosion resistance of the surface coated with resins layer of workpiece enhancing workpiece, to meet subway, tunnel and underground pipe gallery etc.
Harsh use environment.
Here is the explanation of specific embodiment, and following embodiment is unless otherwise specified, then inevitably miscellaneous without containing removing
The component pointed out is not known in other other than matter.
Embodiment 1
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein degreasing agent includes NaOH, 30g/L of 30g/L
Na2CO3, 50g/L Na3PO4·12H2The Na of O and 15g/L2SiO3, 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 pickling solution includes: 13% H as mass fraction2SO4, 0.5% thiocarbamide
And the water of surplus, temperature when pickling are 40 DEG C, the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein the solute of quickening liquid includes the NH of 100g/L4Cl and
The ZnCl of 180g/L2, solvent is water, and helping the temperature of plating is 70 DEG C, and helping the time of plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and is 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
Zinc layers with a thickness of 70 μm.
(7) arrange the remaining zinc on removal surface to workpiece surface or list edge to the roughness Ra of workpiece surface is 25.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, forms zinc-aluminium layer in workpiece surface using centrifugal treating,
Wherein zinc-aluminium coating liquid include 70% zinc, 15% aluminium and 15% chromium, then by workpiece be baked to workpiece dry, is formed
Zinc-aluminium layer with a thickness of 5 μm；
Repeat aforesaid operations (8) twice, temperature when for the first time being toasted workpiece is 320 DEG C, and the time of baking is
30min, temperature when for the second time being toasted workpiece are 200 DEG C, and the time of baking is 30min.
(9) resin layer on the surface of zinc-aluminium layer is prepared using epoxy resin, wherein resin layer with a thickness of 3 μm.
Embodiment 2
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein degreasing agent includes NaOH, 20g/L of 50g/L
Na2CO3, 70g/L Na3PO4·12H2The Na of O and 10g/L2SiO3, 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 pickling solution includes: 13% H as mass fraction2SO4, 0.5% thiocarbamide
And the water of surplus, temperature when pickling are 40 DEG C, the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein the solute of quickening liquid includes the NH of 150g/L4Cl and
The ZnCl of 150g/L2, solvent is water, and helping the temperature of plating is 80 DEG C, and helping the time of plating is 1min.
(5) workpiece is placed in dry at 140 DEG C and is 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
Zinc layers with a thickness of 55 μm.
(7) arrange the remaining zinc on removal surface to workpiece surface or list edge to the roughness Ra of workpiece surface is 12.5.
(8) workpiece is placed in 340 DEG C of zinc-aluminium coating liquid, forms zinc-aluminium layer in workpiece surface using centrifugal treating,
Wherein zinc-aluminium coating liquid include 85% zinc, 5% aluminium and 10% chromium, then by workpiece be baked to workpiece dry, is formed
Zinc-aluminium layer with a thickness of 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 for the third time being toasted workpiece is 200 DEG C, and the time of baking is 30min.
(9) resin layer on the surface of zinc-aluminium layer is prepared using epoxy resin, wherein resin layer with a thickness of 3 μm.
Embodiment 3
(1) ungrease treatment is carried out to workpiece in such a way that water-base metal degreased cleaning agent deoils, wherein electrolyte includes
The Na of NaOH, 30g/L of 15g/L2CO3, 50g/L Na3PO4·12H2The Na of O and 10g/L2SiO3, solvent is water, at degreasing
The temperature of reason is 70 DEG C, and current density when ungrease treatment is 15A/dm2。
(2) workpiece is washed 5 times.
(3) pickling is carried out to workpiece, wherein pickling solution includes: 15% H as mass fraction2SO4, 0.1% thiocarbamide
And the water of surplus, temperature when pickling are 40 DEG C, the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein the solute of quickening liquid includes the NH of 130g/L4Cl and
The ZnCl of 170g/L2, solvent is water, and helping the temperature of plating is 75 DEG C, and helping the time of plating is 2min.
(5) workpiece is placed in dry at 100 DEG C and is 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
Zinc layers with a thickness of 70 μm.
(7) arrange the remaining zinc on removal surface to workpiece surface or list edge to the roughness Ra of workpiece surface is 25.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, forms zinc-aluminium layer in workpiece surface using centrifugal treating,
Wherein zinc-aluminium coating liquid include 80% zinc, 10% aluminium and 10% chromium, then by workpiece be baked to workpiece dry, is formed
Zinc-aluminium layer with a thickness of 4 μm；
It repeats aforesaid operations (8) five times, temperature when for the first time being toasted workpiece to the 4th time is 320 DEG C, baking
Time be 30min, temperature when being toasted workpiece the 5th time is 200 DEG C, and the time of baking is 50min.
(9) resin layer on the surface of zinc-aluminium layer is prepared using epoxy resin, wherein resin layer with a thickness of 5 μm.
Embodiment 4
(1) ungrease treatment is carried out to workpiece in such a way that water-base metal degreased cleaning agent deoils, wherein electrolyte includes
The Na of NaOH, 20g/L of 20g/L2CO3, 70g/L Na3PO4·12H2The Na of O and 5g/L2SiO3, solvent is water, ungrease treatment
Temperature be 90 DEG C, current density when ungrease treatment is 10A/dm2。
(2) workpiece is washed 3 times.
(3) pickling is carried out to workpiece, wherein pickling solution includes: 13% H2SO4,0.2% thiocarbamide as mass fraction
And the water of surplus, temperature when pickling are 60 DEG C, 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
The ZnCl2 of 180g/L, solvent are water, and helping the temperature of plating is 70 DEG C, and helping the time of plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and is 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
Zinc layers with a thickness of 70 μm.
(7) arrange the remaining zinc on removal surface to workpiece surface or list edge to the roughness Ra of workpiece surface is 12.5.
(8) workpiece is placed in 320 DEG C of zinc-aluminium coating liquid, forms zinc-aluminium layer in workpiece surface using centrifugal treating,
Wherein zinc-aluminium coating liquid include 85% zinc, 10% aluminium and 5% chromium, then by workpiece be baked to workpiece dry, is formed
Zinc-aluminium layer with a thickness of 5 μm；
Repeat aforesaid operations (8) twice, temperature when for the first time being toasted workpiece is 320 DEG C, and the time of baking is
30min, temperature when for the second time being toasted workpiece are 200 DEG C, and the time of baking is 30min.
(9) resin layer on the surface of zinc-aluminium layer is prepared using epoxy resin, wherein resin layer with a thickness of 3 μm.
Embodiment 5
(1) mode of chemical deoiling and degreasing carries out ungrease treatment to workpiece, wherein degreasing agent includes NaOH, 30g/L of 30g/L
Na2CO3, 50g/L Na3PO4·12H2The Na of O and 15g/L2SiO3, 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 pickling solution includes: 13% H as mass fraction2SO4, 0.5% thiocarbamide
And the water of surplus, temperature when pickling are 40 DEG C, the time of pickling is 10min.
(4) workpiece is carried out to help plating using quickening liquid, wherein the solute of quickening liquid includes the NH of 100g/L4Cl and
The ZnCl of 180g/L2, solvent is water, and helping the temperature of plating is 70 DEG C, and helping the time of plating is 2min.
(5) workpiece is placed in dry at 80 DEG C and is 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
Zinc layers with a thickness of 70 μm.
(7) arrange the remaining zinc on removal surface to workpiece surface or list edge to the roughness Ra of workpiece surface is 12.5.
The workpiece that the hot-dipping method of the corrosion-resistant coating of Examples 1 to 5 is prepared carries out neutral salt spray test, as a result
As shown in table 1.Wherein, method of the neutral salt spray test according to state marked as GB/T10125-2012 carries out, and spray chamber's temperature is
35 DEG C, NaCl concentration 50g/L, salt water pH value is 7.0.
It can be seen that in the technical solution of Examples 1 to 4 workpiece in neutral salt spray test from the data of Examples 1 to 5
Corrosion resistance obviously increase, after test in 2400 hours still have preferable appearance.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies 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, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of hot-dipping method of corrosion-resistant coating, which is characterized in that the hot-dipping method of the corrosion-resistant coating includes following step
It is rapid:
Workpiece is carried out using quickening liquid to help plating；
The workpiece after helping plating is dried 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, the dip-coating centrifugation to the workpiece surface Jing Guo zinc-plated processing by the way of dip-coating centrifugal treating
The time impregnated when processing is 10s~30s, and the revolving speed of centrifugal treating is 210rpm~300rpm, and the time of centrifugal treating is 10s
~30s, the zinc-aluminium layer include: as mass fraction 70%~85% zinc, 5%~15% aluminium and 5%~15% chromium；
And
Resin layer is prepared on the aluminium zinc layer surface.
2. the hot-dipping method of corrosion-resistant coating according to claim 1, which is characterized in that use quickening liquid to work described
Part further comprise the steps of: before the step of helping plating
Ungrease treatment is carried out to the workpiece in such a way that 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, which is characterized 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 at degreasing using degreasing agent
It manages, NaOH, 20g/L containing 30g/L~50g/L~30g/L Na in the degreasing agent2CO3, 50g/L~70g/L
Na3PO4·12H2The Na of O and 10g/L~15g/L2SiO3, 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, which is characterized 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 at degreasing using electrolyte
It manages, NaOH, 20g/L containing 15g/L~20g/L~30g/L Na in the electrolyte2CO3, 50g/L~70g/L
Na3PO4·12H2The Na of O and 5g/L~10g/L2SiO3, the solvent of the electrolyte is water；The temperature of the ungrease treatment is
70 DEG C~90 DEG C；The current density when ungrease treatment is 10A/dm2~15A/dm2。
5. the hot-dipping method of corrosion-resistant coating according to claim 2, which is characterized in that described to carry out acid to the workpiece
In the step of washing, pickling is carried out using pickling solution, the pickling solution includes: 13%~20% H as mass fraction2SO4、
0.1%~0.5% thiocarbamide and the water of surplus；
Or, carrying out pickling using pickling solution, the pickling solution presses mass fraction in described the step of carrying out pickling to the workpiece
Meter includes: the water of 20%~42% HCl, 4%~5% methenamine and surplus.
6. the hot-dipping method of corrosion-resistant coating according to claim 1, which is characterized in that include in the quickening liquid
The NH of 100g/L~150g/L4The ZnCl of Cl and 150g/L~180g/L2, 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, which is characterized in that the institute by after drying process
It states 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, which is characterized in that described pair by zinc-plated processing
The step of workpiece surface prepares zinc-aluminium layer repeats 2 times~5 times.
9. the hot-dipping method of corrosion-resistant coating according to claim 1, which is characterized in that the material of the resin layer is ring
Oxygen resin；The resin layer with a thickness of 3 μm~5 μm.
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| JPS59173254A (en) * | 1983-03-23 | 1984-10-01 | Sumitomo Electric Ind Ltd | Preparation of highly corrosion resistant zinc plated material |
| CN1053268A (en) * | 1991-01-09 | 1991-07-24 | 河北省冶金研究所 | The double dipping hot plating technology of the high anti-corrosion of steel wire |
| CN101910466A (en) * | 2007-12-28 | 2010-12-08 | Posco公司 | Zinc alloy coated steel sheet having good sealer adhesion and corrosion resistance and process of manufacturing the same |
| CN102994926A (en) * | 2012-12-20 | 2013-03-27 | 常熟市保得利电力通讯设备有限公司 | Hot dip galvanizing process method |
| CN105603349A (en) * | 2016-01-06 | 2016-05-25 | 云南东电线路器材有限公司 | Hot galvanizing process |
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| JPH06235049A (en) * | 1993-02-09 | 1994-08-23 | Nippon Steel Corp | High strength nonmagnetic stainless steel and its production |
| BRPI1007387B1 (en) * | 2009-01-16 | 2019-11-19 | Nippon Steel & Sumitomo Metal Corp | hot-dip zn-al-mg-si-cr alloy coated steel material and its method for production |
| KR101535073B1 (en) * | 2012-08-01 | 2015-07-10 | 동국제강주식회사 | Production method for zn-al alloy coated steel sheet and its production device |
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|---|---|---|---|---|
| JPS59173254A (en) * | 1983-03-23 | 1984-10-01 | Sumitomo Electric Ind Ltd | Preparation of highly corrosion resistant zinc plated material |
| CN1053268A (en) * | 1991-01-09 | 1991-07-24 | 河北省冶金研究所 | The double dipping hot plating technology of the high anti-corrosion of steel wire |
| CN101910466A (en) * | 2007-12-28 | 2010-12-08 | Posco公司 | Zinc alloy coated steel sheet having good sealer adhesion and corrosion resistance and process of manufacturing the same |
| CN102994926A (en) * | 2012-12-20 | 2013-03-27 | 常熟市保得利电力通讯设备有限公司 | Hot dip galvanizing process method |
| CN105603349A (en) * | 2016-01-06 | 2016-05-25 | 云南东电线路器材有限公司 | Hot galvanizing process |
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