CN101191225B - Antiseptic wearable coat and coating method thereof - Google Patents
Antiseptic wearable coat and coating method thereof Download PDFInfo
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- CN101191225B CN101191225B CN2006101186268A CN200610118626A CN101191225B CN 101191225 B CN101191225 B CN 101191225B CN 2006101186268 A CN2006101186268 A CN 2006101186268A CN 200610118626 A CN200610118626 A CN 200610118626A CN 101191225 B CN101191225 B CN 101191225B
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Abstract
The invention discloses a corrosion and abrasion resistant coating and a coating method thereof, comprising: 1. adopting the following coating materials by weight percentage: C: less than or equal to 0.5 percent; Cr: 16 to 26 percent; Ni: 3.5 to 9.5 percent; Mo: 1.0 to 4.0 percent; B: 0.5 to 4.5 percent; Si: 0.5 to 4.5 percent; Cu: 1.0 to 4.0 percent; Mn: 0 to 2.0 percent; rare earth-Re: 0.01 to 1.5 percent; the balance being Fe and inevitable impurities; 2. pretreating the surface of a metallic matrix to reach technological demand; 3. thermal spraying the matrix surface, arranging a plurality of air cooling nozzles surrounding a spray gun which are in parallel with spraying flame velocity on the spray gun; travel rate of the spray gun being 150 to 400 mm/s; surface temperature of workpieces being controlled less than 150 DEG C; finally forming an amorphous stainless steel protective coating on the matrix surface; 4. cleaning sundries on the coating surface, and performing sealing treatment to the coating. The invention solves the protective problem of erosion-corrosion under the condition of acid humid environment and especially that Cl<-> ions and dust particles exist.
Description
Technical field
The present invention relates to metal part surface intensive treatment technology, particularly a kind of antiseptic wearable coat and coating method thereof.
Background technology
Top gas pressure energy recovery gas turbine machine (being called for short TRT), when the wet dust removal method is adopted in gas purification, the existence of nearly saturated humidity, can on metal parts, form local moisture film, the richness that chlorion takes place is long-pending, the solid particulate erosive wear that contains in the coal gas and the interaction of chlorion, cause that more serious erosion corrosion phenomenon produces, at overcurrent positions such as turbine rotor axial region, rotor blade, stator blades and roots thereof, larger area corrosion pit and erosive wear groove mark take place, have influence on the expected service life of equipment, shortened the turnaround of equipment.
The technology of the corrosive wear problem of existing this class of solution in acid wet environment is as follows:
Japanese Patent JP10130805 adopts plasma spraying TiO
2Powder makes matrix surface form oxide coating and protects; Japanese Patent JP2001335913 suppresses TiO by adjusting spraying coating process
2Powder in Plasma Spraying Process Using by a-TiO
2Structure is to r-TiO
2Structural transformation reaches the purpose that improves corrosion resistance coating, but plasma spraying equipment off-set facility complexity is not suitable for on-the-spot big area spraying application.
Japanese Patent JP60215753 adopts spraying NiCrBSi self-melting alloy on metallic matrix, be heated nearly 1100 ℃ subsequently and carry out coating remelting and DIFFUSION TREATMENT, make coated crystal organize homogeneous phase and eliminate hole, improve the solidity to corrosion of coating, handle but be difficult to carry out the remelting of big area high temperature, have the possibility of the deformation of member after the pyroprocessing simultaneously for large-scale component.Japanese Patent JP55115941 adopts the NiCoCrAl powdered alloy, and thermospray forms low-expansion anti-thermal shock coating, is used for gas turbine high temperature oxidation resisting and thermal etching.
Number of patent application WO0144533 mixes mica respectively to improve gas turbine high temperature oxidation resisting and wear resistance in alloy A lSi, AlCu, NiCrFeMoCoW, CoNiCrAlY matrix, adapting to the user demand under the differing temps, but these class methods are not suitable for moist acid attack abrasion environment.
Summary of the invention
The object of the present invention is to provide a kind of antiseptic wearable coat and coating method thereof, solving in the acid wet environment is particularly having Cl
-There are the protection question of erosion corrosion down in ion and dust granules.
For achieving the above object, technical scheme of the present invention is:
A kind of antiseptic wearable coat, its composition quality per-cent be,
C ≤0.5
Cr 16～26
Ni 3.5～9.5
Mo 1.0～4.0
B 0.5～4.5
Si 0.5～4.5
Cu 1.0～4.0
Rare earth RE 0.01～1.5
Surplus is Fe and inevitable impurity.
Further, also comprise Mn 0～2.0, by percentage to the quality.
Again, described rare earth RE comprises Ce, La, Y.
In the present invention,
Chromium, the effect in stainless steel mainly is to improve the corrosion resistance nature of steel, mainly is because chromium can form one deck Cr at stainless steel surface after oxidation
2O
3Protective membrane, can effectively stop the extraneous soda acid factor enter and continue the corrosion.
Nickel, the effect in stainless steel can be embodied on its erosion resistance on the one hand, and stainless mechanical property also can be improved greatly in the aspect on the other hand, and a certain amount of nickel can change the heterogeneous microstructure of steel.
After adding right amount of boron, element silicon, can obviously reduce the solid-liquid phase temperature of alloy, the solid-liquid that makes alloy have a broad is interval mutually, help the formation of amorphous alloy, along with the increase of boron, element silicon, its hardness increases thereupon, but too high boron content is unfavorable for and the combining of matrix metal, silicon is dissolved in the matrix, plays the solution strengthening effect.Molybdenum, copper can significantly improve the solidity to corrosion of alloy in non-oxidizing acid.
Manganese and nickel can change the heterogeneous microstructure of steel equally, improve the stability of tissue.The adding of rare earth elements RE improves the thermodynamic stability of amorphous alloy, has suppressed the formation of recrystallize, and simultaneously, rare earth elements RE can also have been improved the plasticity and the toughness of passive film, improves corrosion resisting property.
The coating method of antiseptic wearable coat of the present invention, it comprises the steps:
1) the composition quality per-cent of the coated material of Cai Yonging is, C≤0.5, Cr 16～26, Ni 3.5～9.5, Mo 1.0～4.0, B 0.5～4.5, Si 0.5～4.5, Cu 1.0～4.0, Mn 0～2.0, rare earth RE 0.01～1.5, surplus are Fe and inevitable impurity;
2) to metal base surface heat, sandblast alligatoring and pressurized air drifting dust handle and make surfaceness and degree of cleaning reach the Construction of Thermal Spraying demand;
3) adopt thermospray through pretreated matrix surface, forming the amorphous metal alloy supercoat; Wherein, on spray gun, be provided with and many capable air cooling nozzles of spraying flame levelling around spray gun; The spray gun translational speed is 150～400mm/s, forms coating and successively superposes, workpiece surface temperature is controlled at＜and 150 ℃, finally form non-crystalline state stainless steel protection coating at matrix surface;
4) clear up coatingsurface burr and removing surface irregularities subsequently, when the sprayed surface temperature is reduced to 50～60 ℃, brush encapsulant and carry out the processing of coating sealing of hole.
Further, described coated material Cheng Sicai or Powdered.
Again, the described nozzle of step 3) is 75～150mm to the spray distance of workpiece.
The every layer thickness of step 3) is 0.05～0.10mm.
The encapsulant that step 4) is brushed is the liquid encapsulant of epoxy, phenolic aldehyde or silicone resin type.
Many the air cooling nozzles around spray gun capable with spraying the flame levelling are set on spray gun are the equal angles symmetrical distribution.
In addition, at least 4 air cooling nozzles are set on the spray gun.
The present invention is directed under the acid dampness, there are solids to exist, the different corrosion conditions that degree of impairment is comparatively complicated, adopt the FeCrNiMoBZE series non-crystalline state stainless steel spray material of hot-spraying techniques method and adding rare earth, form amorphous metal coatings corrosion-resistant, the antiscour wearing and tearing on surface, easy damaged position, after organic sealing agent and coating processing, reach the purpose of corrosion resistant antiwear.Coating is made up of amorphous metal alloy layer and organic sealing agent.
Method for surface reinforced treatment of metal part of the present invention has following characteristics:
(1) the hot-spraying techniques operation of equipment is convenient, the spray efficiency height, and cost is lower, for being difficult for travelling workpiece, can carry out on-the-spot large-area construction.
(2) the bonding strength height of non-crystalline state stainless steel coating and metallic matrix, do not need spraying in conjunction with bottom, has higher intensity and hardness with the crystalline state metallographic phase than amorphous metal coating, abrasion resistance properties strengthens, simultaneously,, arranges in the amorphous microstructure atom lattice imperfection that does not have crystalline state metals such as crystal boundary and dislocation to exist because being random state, reduced corrosion and formed the path, corrosion resisting property improves.
(3) adding of the rare earth elements RE in the spray material, the thermodynamic stability of amorphous alloy is improved, suppressed the formation of recrystallize, simultaneously, the plasticity and the toughness of passive film have been improved, improve corrosion resisting property, coated material can be made a material or powder to adapt to the process requirements of different spraying equipments.
(4) in thermal spray process, what setting and spraying flame levelling were capable on the spray gun is equal angles symmetrical distribution cooling jet around spray gun more than 4, forms ring-type air cooling band, accelerates the cooling of coating, avoids the transformation of coating structure to crystalline state.
(5) because all there is certain space in thermally sprayed coating, harmful substance infiltrates the destruction of causing coating with matrix effect meeting, adopts hole sealing agent to handle, and can intercept the erosion of corrosive medium to metallic substance effectively, improves the protection effect of coating.
Embodiment
Embodiment is referring to table 1.
Table 1
Unit: mass percent
| Embodiment | C | Cr | Ni | Mo | B | Si | Cu | Mn | Ce | La | Y | Fe |
| 1 | 0.07 | 21.1 | 7.12 | 3.4 | 2.5 | 1.35 | 1.98 | 1.92 | 0.046 | Surplus | ||
| 2 | 0.10 | 22.2 | 6.81 | 3.8 | 2.3 | 1.25 | 2.10 | 0 | 0.038 | Surplus | ||
| 3 | 0.05 | 17.5 | 5.70 | 2.9 | 1.9 | 1.37 | 2.83 | 1.98 | 0.029 | Surplus | ||
| 4 | 0.08 | 25.7 | 8.04 | 1.8 | 3.4 | 3.00 | 3.24 | 0 | 0.058 | Surplus | ||
| 5 | 0.49 | 16.2 | 3.57 | 1.2 | 4.3 | 0.54 | 3,86 | 1.99 | 0.146 | Surplus | ||
| 6 | 0.06 | 21.4 | 9.48 | 3.9 | 0.6 | 4.40 | 1.12 | 0 | 0.014 | Surplus |
4 above air cooling nozzles are set on the spray gun in spraying process, and coat-thickness is 0.20～0.90mm; Thickness is 0.10～0.50mm.The organic sealing film thickness is 1～20 μ m, and the organic anti-corrosive coat-thickness is 0.05～0.30mm.Whole compound coating thickness is at 0.25～1.20mm.
The method of making compound coating is to adopt hot-spraying techniques to form coating on metallic matrix, adopts the method for heating, sandblast and pressurized air cleaning that metal base surface is carried out texturing and clean before the spraying, to guarantee the good combination of coating and matrix.Metallize protective layer on the pretreated matrix surface of process, thickness is 0.20～0.90mm; The liquid encapsulant of brushing, spraying or roller coating epoxy, phenolic aldehyde or silicone resin type carries out the coating sealing of hole and handles, and the organic sealing film thickness is 1～20 μ m, forms the complex protection to workpiece.
The electric arc spraying process method; at first processing work is heated polishing and remove corrosion product and moisture; there is corrosion pit will carry out soldering; with 20 order corundum sands metal base surface is carried out sandblast alligatoring and the processing of pressurized air drifting dust; make surfaceness and degree of cleaning reach the Construction of Thermal Spraying demand; adopt electric arc spraying FeCrNiMoBCe non-crystalline state Stainless Steel Wire material subsequently; 4 the air cooling nozzles that around spray gun are equal angles symmetrical distribution capable with spraying flame levelling are set on the spray gun in spraying process; spray distance 75～150mm; the spray gun translational speed is 150～400mm/s; forming coating successively superposes; every layer thickness is about 0.05～0.10mm; workpiece surface temperature should be controlled at＜and 150 ℃; finally form the non-crystalline state stainless steel protection coating of thickness 0.5mm at matrix surface; subsequently with stainless steel brush cleaning coatingsurface burr; dried compressed air is removed surface irregularities; when the sprayed surface temperature is reduced to 50～60 ℃; brush the liquid encapsulant of phenolic resin type and carry out the processing of coating sealing of hole; brush three times; the first pass construction guarantees that coating fully infiltrates; resol layer thickness 10 μ m are treated to carry out after the coating surface drying twice in the back.Composite protective layer thickness 〉=0.5mm.
Adopt the hot-spraying techniques method of the invention described above, blast-furnace top gas recovery energy recovery turbine major parts is carried out corrosion prevention to be handled, obtained good on-the-spot result of use, what the annual overhaul cycle of turbine system was preceding thus extended to more than a year and a half less than 1 year.
Claims (6)
1. antiseptic wearable coat, its composition quality per-cent be,
C ≤0.5％
Cr 16～26％
Ni 3.5～9.5％
Mo 1.0～4.0％
B 0.5～4.5％
Si 0.5～4.5％
Cu 1.0～4.0％
Rare earth RE 0.01～0.146%
Surplus is Fe and inevitable impurity; And coating is the amorphous metal alloy supercoat.
2. antiseptic wearable coat as claimed in claim 1 is characterized in that, also comprises Mn, 0＜Mn≤2.0%, by percentage to the quality.
3. antiseptic wearable coat as claimed in claim 1 is characterized in that, described rare earth RE comprises Ce, La, Y.
4. the coating method of antiseptic wearable coat as claimed in claim 1 or 2, it comprises the steps:
1) the composition quality per-cent of the coated material of Cai Yonging is, C≤0.5%, Cr 16～26%, Ni3.5～9.5%, Mo 1.0～4.0%, B 0.5～4.5%, Si 0.5～4.5%, Cu 1.0～4.0%, Mn 0～2.0%, rare earth RE 0.01～0.146%, surplus are Fe and inevitable impurity;
2) to metal base surface heat, sandblast alligatoring and pressurized air drifting dust handle and make surfaceness and degree of cleaning reach the Construction of Thermal Spraying demand;
3) adopt thermospray through pretreated matrix surface, forming the amorphous metal alloy supercoat; Wherein, on spray gun, be provided with at least 4 with the capable air cooling nozzle of spraying flame levelling around spray gun, and the air cooling nozzle is equal angles and is symmetrically distributed; Nozzle is 75～150mm to the spray distance of workpiece, the spray gun translational speed is 150～400mm/s, and the coating of formation successively superposes, and every layer thickness is 0.05～0.10mm, workpiece surface temperature is controlled at＜and 150 ℃, finally form the amorphous metal alloy supercoat at matrix surface;
4) cleaning coatingsurface burr and removing surface irregularities when the sprayed surface temperature is reduced to 50～60 ℃, are brushed encapsulant and are carried out the processing of coating sealing of hole.
5. the coating method of antiseptic wearable coat as claimed in claim 4 is characterized in that, described coated material Cheng Sicai or Powdered.
6. the coating method of antiseptic wearable coat as claimed in claim 4 is characterized in that, the encapsulant that step 4) is brushed is the liquid encapsulant of epoxy, phenolic aldehyde or silicone resin type.
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| CN101191225B true CN101191225B (en) | 2011-05-11 |
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