CN109023210A - The preparation method of cast iron alitizing coating - Google Patents
The preparation method of cast iron alitizing coating Download PDFInfo
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- CN109023210A CN109023210A CN201810906466.6A CN201810906466A CN109023210A CN 109023210 A CN109023210 A CN 109023210A CN 201810906466 A CN201810906466 A CN 201810906466A CN 109023210 A CN109023210 A CN 109023210A
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
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- Coating By Spraying Or Casting (AREA)
Abstract
The preparation method of cast iron alitizing coating of the present invention belongs to Surface Science and corrosion and protection field, more particularly to the method for a kind of pair of metal material plating.Its purpose is to provide a kind of preparation method of the cast iron alitizing coating of stronger pyro-oxidation resistance and corrosion resistance.The preparation method of cast iron alitizing coating of the present invention includes: to use for reference laser remolten repairing technique, and it is applied in surface covering preparation, to spray dedicated fine aluminium silk material as raw material, using oxy-acetylene flame spraying mode, calorized coating is prepared in cast iron matrix material surface.Relative to hot-dip aluminizing plating leakage, consumption aluminum amount is big, generates for pernicious gas, and coating surface quality made from the preparation method of cast iron alitizing coating of the invention is good, reduces the consumption and waste of the energy, does not also pollute to air.
Description
Technical field
The invention belongs to Surface Sciences and corrosion and protection field, more particularly to the side of a kind of pair of metal material plating
Method.
Background technique
Cast iron materials are because its is low in cost, casting formability is good, good damping compression-resistant ability, in actual industrial production
In be concerned.But oxidation resistant ability is weaker under its high temperature.Preparing the most common method of Al-based coating at present is Cheng W
J[Cheng W J,Wang C J.EBSD characterization of high-temperature phase
transformations in an Al–Si coating on Cr–Mo steel[J].Materials
Characterization, 2012,64 (2): 15-20] et al. obtained using the method for hot-dip, it is practical to have put into production
In.But the method is there are still the problems that can not solve of many, for example plating leakage, quickening liquid is unstable, consumption aluminium is big, waste energy
Source, coverture pollution environment etc., thus develop new method prepare Al-based coating put into production it is most important.
R.S.C Paredes[R.S.C Paredes,S.C Amico,A.S.C.M d’Oliveira.The effect
of roughness and pre-heating of the substrate on the morphology of aluminium
coatings deposited by thermal spraying[J],Surf Coat Technol,2006；200(9):3049
~3055.] the advantages that coating quality et al. using plasma spray technology preparation is good, easy to operate, workpiece deflection is small, it is wide
General is applied to the specific functions coatings art such as anti-corrosion, wear-resisting.But A.G Liu, [A.G Liu, M.H Guo, M.H Zhao,
H Ma.Arc sprayed erosion-resistant coating for carbon fiber reinforced
polymer matrix composite substrates[J],Surf Coat Technol,2006；200 (9): 3073~
3077.] et al. research discovery is since the combination of hot-spraying coating and matrix is not metallurgical bonding, bond strength one mostly
As it is impossible to meet requiring, under certain operating conditions, the phenomenon that being easy to produce crackle, or even peel off, influence workpiece
Service life.Wang Jidong [king after the iron-based electric arc spraying aluminium layer of eastern high-frequency induction melting technique [J] plating and finish, 2005,
03:15-18.] when carrying out the heating of high temperature inducting remolten to electric arc spraying aluminium layer, it proposes using 625 water of waterglass and high alumina
Mud compo brushes aluminium layer surface, can prevent aluminium layer from aoxidizing at high temperature, coating can voluntarily fall off after remelting, alternative
The effect of gas shield.Metallurgical bonding occurs for matrix and aluminium layer when remelting, and diffusion layer organization even compact, bond strength is larger, can
Strong operability.A kind of new coating production is proposed on the basis of comprehensive forefathers' research, i.e., in sample through oil removing, pickling
A kind of derusting (can be used Chinese patent 201310284195.2, alumetized steel and preparation method, the quick acid washing method of announcement) spray
Remelting is carried out after sand and DIFFUSION TREATMENT carrys out prepares coating.
Summary of the invention
The technical problem to be solved in the present invention is to provide the novel of a kind of stronger pyro-oxidation resistance and corrosion resistance
The preparation method of Cast Iron Surface calorized coating is proposed based on laser induced remelting and alitizing technology, is to utilize oxygen
Fine aluminium line-material coating to cast iron matrix material surface is then carried out remelting and DIFFUSION TREATMENT by acetylene torch spraying, obtains infiltration layer
The biggish calorized coating of thickness, makes it have good high temperature oxidation resistance, and technological operation is simple, it can be achieved that industrial metaplasia
It produces.
The present invention relates to a kind of preparation method of cast iron alitizing coating, the method uses for reference laser remolten repairing
Technology, and be applied in surface covering preparation, to spray dedicated fine aluminium silk material as raw material, using oxy-acetylene flame spraying
Mode prepares calorized coating in cast iron matrix material surface.
Preferably, it the described method comprises the following steps:
(1) aluminium wire is selected: using spraying dedicated aluminium wire, the dedicated aluminium wire 99.6wt% containing Al of the spraying, Si≤
0.3wt%, Fe≤0.4wt%, separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05wt%；
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material；
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm；
(4) it remelting: after basis material of the step (3) through spraying Al-based coating is cut into the sample of suitable dimension, is put into
Into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature；
(5) diffusion annealing: step (4) is put into the Muffle furnace of specified diffusion temperature through the sample of re melting process and is carried out
Diffusion annealing processing, takes out after certain diffusion time, is air-cooled to room temperature；
(6) it polishes: being carried out at surface since surface roughness is larger with fine sandpaper to through step (5) treated sample
Reason polishing, that is, complete the preparation of cast iron alitizing coating of the present invention.
Preferably, step (2) the medium cast iron basis material is in production using wider HT200.
Preferably, oil removing is to be cleaned using organic solvent such as alcohol, acetone in the step (2), is then rushed with water
2~3min is washed, guarantees to clean up；Derusting is cleaned using the HCL aqueous solution that volume fraction is 10%~20%, and room temperature is clear
Wash 1~2min of time；Sandblasting uses partial size to carry out sandblasting roughening treatment to matrix surface for 200-700 μm of corundum sand, mentions
The roughness of high matrix surface.
The sample after flame-spraying is directly introduced to carry out re melting process under high temperature in the step (4), so that aluminium
Base coating is fused into rapidly liquid phase, metallurgical bonding occurs in interface and cast iron materials, and generate obvious interdiffusion phenomenon,
About 40 μm can be penetrated into matrix.
Using total coating thickness made from method of the invention be close to 600 μm, the main object of coating outer layer be mutually Al and
FeAl3, internal layer object are mutually mainly Fe2Al5。
In method of the invention, under high temperature environment, surface can form fine and close oxidation film, prevent oxygen atom further with
Oxidation reaction occurs for basis material, can be obviously improved the ability of resistance to high temperature oxidation.
The present invention is using the wear resistance of the aluminising sample of method spray-on coating of the invention and in 5%NaCl
Corrosion-resistant in solution, which also has, significantly to be promoted.
Preferably, the specimen size cut in the step (4) is 17mm × 20mm × 5mm.
Preferably, melting temperature in the step (4) again is 840~900 DEG C.
Preferably, diffusion time is 2~5h in the step (5).
The preparation method difference from prior art of cast iron alitizing coating of the present invention is:
1, the preparation method of cast iron alitizing coating of the present invention is easy to operate, and the size shape of workpiece is not any
Limitation, coating material are fine aluminium wire material, do not add any valuable metallic element and rare earth element, reduce and be produced into
This.
2, relative to hot-dip aluminizing plating leakage, consumption aluminum amount is big, generates for pernicious gas, cast iron surface of the invention is seeped
Coating surface quality made from the preparation method of aluminized coating is good, reduces the consumption and waste of the energy, to air also without dirt
Dye.
3, metallurgical bonding occurs for calorized coating and matrix prepared by the present invention, and the counterdiffusion of very long range has occurred, and ties
It closes secured.
4, calorized coating overall thickness prepared by the present invention can form fine and close oxidation film at 600 μm on surface under high temperature,
800~900 DEG C can prolonged application without fail.
Detailed description of the invention
Fig. 1 is that the Cross Section Morphology figure of coating is made in the preparation method of cast iron alitizing coating of the present invention；
Fig. 2 is one timing of other parameters, influence curve figure of the different remelting temperatures to alloying layer thickness；
Fig. 3 is one timing of other parameters condition, the curve graph that different diffusion times influences alloying layer thickness；
Fig. 4 is to be continued until matrix position, the material phase analysis X-ray diffractogram of different zones range from coating performance；
Fig. 5 is the oxidation of Spray aluminizing sample and cast iron coupon under the different cyclic oxidation time at 800,900 DEG C
Increase weight curve；
Fig. 6 is the wear shape figure of cast iron coupon, coating；
Fig. 7 is the wear shape figure of cast iron coupon, coating；
Fig. 8 is the wear shape figure of cast iron coupon, coating.
Specific embodiment
By following embodiment and verification test to the preparation method of cast iron alitizing coating of the invention make into
The explanation of one step.
Embodiment 1
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be 840 DEG C of remelting temperature, and other parameters press Orthogonal Experiment and Design.[previous step
In parameter whether be design in design parameter.]
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 394.6 μm.
Embodiment 2
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be 860 DEG C of remelting temperature, and other parameters press Orthogonal Experiment and Design.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 354.375 μm.
Embodiment 3
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be 880 DEG C of remelting temperature, and other parameters press Orthogonal Experiment and Design.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 424.525 μm.
Embodiment 4
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be 900 DEG C of remelting temperature, and other parameters press Orthogonal Experiment and Design.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 444.85 μm.
Embodiment 5
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be diffusion time 2h, and other parameters press Orthogonal Experiment and Design.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 393.475 μm.
Embodiment 6
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The present embodiment technological parameter is chosen to be diffusion time 3h, and other parameters press Orthogonal Experiment and Design.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 387.175 μm.
Embodiment 7
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 429.4 μm.
The present embodiment technological parameter is chosen to be diffusion time 4h, and other parameters press Orthogonal Experiment and Design.
Embodiment 8
The preparation method of the cast iron alitizing coating of the present embodiment sequentially includes the following steps:
(1) Spray aluminizing prepares Al-based coating, the aluminium wire ingredient of spraying are as follows: Al (99.6), Si (≤0.3), Fe (≤
0.4) separately containing a small amount of impurity such as Cu, Mn, Zn, Ti etc., content is within 0.05.
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material.
(3) it oxy-acetylene flame spraying: is made on the basis material after step (2) surface treatment using flame spray device
Standby Al-based coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spraying away from
From 120~150mm, wire feed rate 2m/min, coating thickness 0.5mm.
(4) the cast iron piece wire cutting by (3) through spraying Al-based coating is put at having a size of 17mm × 20mm × 5mm sample
Enter into the constant temperature Muffle furnace of specified remelting temperature, after keeping the temperature certain remelting time, taking-up is air-cooled to room temperature.
(5) (4) are put into the Muffle furnace of specified diffusion temperature through the cast iron coupon of re melting process and are diffused annealing
Processing, takes out after certain diffusion time, is air-cooled to room temperature.
(6) it is surface-treated since surface roughness is larger with fine sandpaper to through (5) treated sample.
The alloying layer thickness under this technique is measured using SEM, PS etc. and microscopic appearance is observed, it is known that infiltration layer is good
It is good, thickness are as follows: 408.3 μm.
The present embodiment technological parameter is chosen to be diffusion time 5h, and other parameters press Orthogonal Experiment and Design.
Verification test
By survey of the coating of aluminising sample made from preparation method of the present invention and other several reports in 5%NaCl solution
Corrosion rate is tried, the results are shown in Table 1.
The comparison between corrosion of table 1 aluminising sample and the prior art prepared by the present invention
Fig. 1 is the Cross Section Morphology figure of Cast Iron Surface calorized coating produced by the present invention；Fig. 2 is one timing of other parameters, no
Influence curve figure of the same remelting temperature to alloying layer thickness；Fig. 3 is one timing of other parameters condition, and different diffusion times is to infiltration
The curve graph of layer thickness effect；Fig. 4 is to be continued until matrix position, the material phase analysis X of different zones range from coating performance
X ray diffration pattern x；Fig. 5 is the oxygen of Spray aluminizing sample and cast iron coupon under the different cyclic oxidation time at 800,900 DEG C
Change weight gain curve；Fig. 6 is the wear shape figure of cast iron coupon, coating；Fig. 7 is the fretting wear shape of cast iron coupon, coating
Looks figure；Fig. 8 is the wear shape figure of cast iron coupon, coating.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, various changes or modifications can be made to these embodiments, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (7)
1. a kind of preparation method of cast iron alitizing coating, it is characterised in that: the method is to spray dedicated aluminium wire
Calorized coating is prepared in cast iron matrix material surface using oxy-acetylene flame spraying mode for raw material.
2. the preparation method of cast iron alitizing coating according to claim 1, it is characterised in that: the method packet
Include following steps:
(1) aluminium wire is selected: using spraying dedicated aluminium wire, the dedicated aluminium wire 99.6wt% containing Al of the spraying, Si≤
0.3wt%, Fe≤0.4wt%；
(2) surface degreasing, derusting, blasting treatment are carried out to cast iron matrix material；
(3) oxy-acetylene flame spraying: aluminium is prepared on the basis material after step (2) surface treatment using flame spray device
Base coating, technological parameter are as follows: oxygen pressure 0.4MPa, acetylene pressure 0.06MPa, air pressure 0.5MPa, spray distance 120
~150mm, wire feed rate 2m/min, coating thickness 0.5mm；
(4) remelting: after basis material of the step (3) through spraying Al-based coating is cut into the sample of suitable dimension, it is put into perseverance
After keeping the temperature in warm Muffle furnace, taking-up is air-cooled to room temperature；
(5) diffusion annealing: step (4) is taken after the sample of re melting process is put into Muffle furnace and is diffused annealing
Out, it is air-cooled to room temperature；
(6) it polishes: is polished with fine sandpaper through step (5) treated sample, that is, complete cast iron surface of the present invention
The preparation of calorized coating.
3. the preparation method of cast iron alitizing coating according to claim 2, it is characterised in that: the step
(2) medium cast iron basis material is HT200.
4. the preparation method of cast iron alitizing coating according to claim 3, it is characterised in that: the step
(2) oil removing is to be cleaned using organic solvent in, is then rinsed with water 2~3min；Derusting using volume fraction be 10%~
20% HCL aqueous solution is cleaned, 1~2min of room temperature scavenging period；Sandblasting uses partial size for 200-700 μm of corundum sand
Sandblasting roughening treatment is carried out to matrix surface, improves the roughness of matrix surface.
5. the preparation method of cast iron alitizing coating according to claim 4, it is characterised in that: the step
(4) specimen size cut in is 17mm × 20mm × 5mm.
6. the preparation method of cast iron alitizing coating according to claim 5, it is characterised in that: the step
(4) melting temperature in again is 840~900 DEG C.
7. the preparation method of cast iron alitizing coating according to claim 6, it is characterised in that: the step
(5) diffusion time is 2~5h in.
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