CN107034427B - The alloy coat and preparation method thereof of boiler heating surface high-temperature corrosion resistance - Google Patents
The alloy coat and preparation method thereof of boiler heating surface high-temperature corrosion resistance Download PDFInfo
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- CN107034427B CN107034427B CN201710235992.XA CN201710235992A CN107034427B CN 107034427 B CN107034427 B CN 107034427B CN 201710235992 A CN201710235992 A CN 201710235992A CN 107034427 B CN107034427 B CN 107034427B
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- 239000000956 alloy Substances 0.000 title claims abstract description 133
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 132
- 230000007797 corrosion Effects 0.000 title claims abstract description 40
- 238000005260 corrosion Methods 0.000 title claims abstract description 40
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 75
- 238000000576 coating method Methods 0.000 claims abstract description 61
- 239000011248 coating agent Substances 0.000 claims abstract description 59
- 239000002344 surface layer Substances 0.000 claims abstract description 36
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910001120 nichrome Inorganic materials 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims abstract description 30
- 238000005516 engineering process Methods 0.000 claims abstract description 27
- 239000001997 corrosion-resisting alloy Substances 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 19
- 238000007788 roughening Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 6
- 229910001119 inconels 625 Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000005488 sandblasting Methods 0.000 claims description 13
- 238000010285 flame spraying Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000012159 carrier gas Substances 0.000 claims description 8
- 230000004907 flux Effects 0.000 claims description 8
- 239000002737 fuel gas Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 7
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000010301 surface-oxidation reaction Methods 0.000 claims description 2
- 239000010742 number 1 fuel oil Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 description 9
- 229910052801 chlorine Inorganic materials 0.000 description 9
- 239000003350 kerosene Substances 0.000 description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 239000010813 municipal solid waste Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011253 protective coating Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000002633 protecting effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 240000005561 Musa balbisiana Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 229940100616 topical oil Drugs 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- 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
- C23C4/08—Metallic material containing only metal elements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The present invention discloses a kind of high-temp corrosion-resisting alloy coating and preparation method thereof of boiler heating surface, and the high-temp corrosion-resisting alloy coating includes NiCrAlY alloy prime coat and Incone1625/NiCr alloy surface layer；It is stand-by that spherical complex alloy powder, drying is made comprising steps of (1) mixes in proportion Incone1625 alloy powder and NiCr alloy powder in the preparation method；(2) substrate surface is cleaned, roughening treatment；(3) NiCrAlY alloy powder is sprayed in substrate surface using plasma spray technology, forms prime coat；(4) surface layer is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology.(5) alloy coat to get the high-temperature corrosion resistance is cooled down.The coating prepared by this method has the features such as porosity is low, each layer is tightly combined, surface even compact, and resistance to high temperature corrosion performance is good, can prolonged boiler service life, save cost.
Description
Technical field
The present invention relates to corrosion-inhibiting coating technical fields, and in particular to a kind of alloy coat of boiler heating surface high-temperature corrosion resistance
And preparation method thereof.
Background technique
Waste incineration is a kind of main means of current garbage disposal, but component of refuse is extremely complex, content of organics
Height, simultaneously containing the harmful substances such as a large amount of Cl, S and alkali metal, these ingredients can be generated after high temperature incineration HCl gas and
NaCl, KCl etc. deposit salt, cause Boiler Metallic heated surface corrosion serious.High temperature corrosion causes the accident rate and greatly increases, limit
The popularization and development of garbage incineration technology are made.Therefore solve the problems, such as that garbage burning boiler high temperature chloride corrosion is most important.
Metal surface covering protection coating is a kind of method for effective protecting of high temperature chloride corrosion, but the property of protective coating
It can be dependent firstly on the resistance to high temperature corrosion ability of alloy itself, secondly depend on the binding ability and consistency of coating and matrix,
And the binding performance of coating and matrix depends on spraying process and alloy material itself self-fluxing nature energy.
Now widely used thermal spraying material is the nickel-base alloy of the content containing higher chromium.In NiCr alloy coat, the U.S.
The 45CT resistance to corrosion of development is 60 times of carbon steel, and flat denuding process is less than 0.0127mm/, and the service life of coating reaches
10 years or more, there is excellent corrosion resistance, the corrosion-proof wear protection being used as in boiler tubing high temperature sulfur-bearing atmosphere applies
Layer, but its price is more expensive, domestic burning power plant can not undertake substantially, thus be difficult to promote.
Inconel625 alloy (Ni-Cr-Mo-Nb) protective performance more excellent compared with other alloys, studies have shown that
Inconel625 alloy all shows fabulous corrosion resistance in many media, has good inorganic acid resistance corrosivity, such as
Sulfuric acid, hydrochloric acid etc., while also with the performance of alkaline-resisting and organic acid corrosion in oxidation and reducing environment, especially in chloride
There is the performance of outstanding anti-spot corrosion, crevice corrosion, intercrystalline corrosion and erosion in medium.The alloy show effective anti-chlorine from
Sub- reproducibility stress corrosion cracking all has anti-carbonation and oxidisability in static or circulation environment.It is high-temperature flue gas containing chlorine
The high-temperature corrosion resistance material of middle energy reliably working, all has good tensile property and fatigue from low temperature to 980 DEG C of high temperature sections
Performance.But it needs to improve using Inconel625 alloy coat consistency and hole-sealing technology.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of suitable garbage burning boiler heating surface high-temperature corrosion resistance
Alloy coat and preparation method, the alloy coat have excellent high-temperature corrosion resistance performance, be particularly suitable for carbon steel and its
His steel alloy boiler heating surface, can be used for boiler, engine chamber, gas turbine etc..
The present invention is realized using following technical scheme:
High-temp corrosion-resisting alloy coating, prime coat and surface layer, the prime coat including being successively coated in substrate are
NiCrAlY alloy coat, the surface layer are Incone1625/NiCr alloy coat.
In wherein some embodiments, globular powder that the material of the prime coat is 25-55 μm of average grain diameter
NiCrAlY；The material of the surface layer is that Incone1625 alloy powder and NiCr alloy powder press (60wt%-90wt%):
(10wt%-40wt%) is uniformly mixed spherical complex alloy powder obtained, and the average grain of the spherical complex alloy powder
Diameter is 25-55 μm.
In wherein some embodiments, the prime coat with a thickness of 90-110 μm, the surface layer with a thickness of 350-500
μm。
It is a further object of the present invention to provide the preparation methods of above-mentioned high-temp corrosion-resisting alloy coating.
Specific technical solution is as follows:
The preparation method of above-mentioned high-temp corrosion-resisting alloy coating, comprising the following steps:
(1) Incone1625 alloy powder and NiCr alloy powder are mixed in proportion, spherical composite alloy is made
Powder, drying are stand-by；
(2) substrate surface is cleaned, roughening treatment；
(3) NiCrAlY alloy powder is sprayed in the substrate surface using plasma spray technology, forms prime coat；
(4) surface layer is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology；
(5) alloy coat to get the high-temperature corrosion resistance is cooled down.
Inconel625 alloy powder and NiCr alloy powder in wherein some embodiments, in the step (1)
Ratio is (60wt%-90wt%): (10wt%-40wt%), and the average grain diameter of the spherical complex alloy powder is 25-55 μ
m；The NiCrAlY alloy powder is Ni 60-70%, Cr 15-25%, Al 10-15%, Y for composition by mass percentage
0.5-1.5%, the globular powder of 25-55 μm of average grain diameter of the NiCrAlY alloy powder.
In wherein some embodiments, the coating thickness of the prime coat is 90-110 μm；The surface layer coating thickness is
350-500μm。
In wherein some embodiments, the plasma spray technology is supersonic flame spraying technology.
In wherein some embodiments, the technological parameter of the supersonic flame spraying technology are as follows: combustion-supporting gas oxygen stream
Amount is 1700~1750cfh；Fuel gas kerosene oil flow is 6.0~6.5gph；Carrier gas flux is 21~25cfh；Powder feed rate
For 55~65g/min；Rifle is away from being 300-500mm；Linear velocity is 450-550mm/s；It is sprayed when spraying prime coat in the step (3)
Applying number is 4-8 times；Spraying number in the step (4) when spraying surface is 8-12 times.
In wherein some embodiments, in step (2), it is described substrate surface is cleaned, roughening treatment the step of packet
It includes: first removing substrate surface greasy dirt, then blasting treatment is carried out to substrate surface, remove substrate surface oxidation film, be roughened substrate table
Face；The technological parameter of the blasting treatment are as follows: sand size is 40-50 mesh, and pressure 0.2-0.5MPa, sandblasting angle is 80-
100 °, sandblasting distance 50-70mm, blast time 20-50s.
In wherein some embodiments, the substrate after the roughening treatment is heated, carries out NiCrAlY after preheating again
The spraying of alloy powder, spraying method are sprayed using HVOF neutral flame.
Compared with the existing technology, the invention has the following advantages that
(1) porosity of Incone1625/NiCr-NiCrAlY alloy coat is low, surface even compact, and coating is complete, connects
It is continuous, being tightly combined between each layer, resistant to high temperatures, corrosion resistance and good, and had both the function of a variety of alloy coats, it can be preferably
It solves the problems, such as waste incinerator heating surface wear and corrosion at high temperature, extends the service life of waste incinerator, save cost.
(2) alloy coat is prepared using supersonic flame spraying technique, the consistency and binding force of coating can be improved, make it
Have superior high temperature chlorine corrosion resistant and etch resistant properties.
(3) while simplifying technique, the protective performance of coating is improved: the certainly molten NiCr of addition in Inconel625 alloy
Alloy sprays flame properties by regulation, so that coating is realized pore self-sealing effect in the construction process, enhance the consistency of coating
And hardness, simultaneously because Inconel625 has good structure stability and use reliability, and have resistance to inorganic well
The advantages that acid corrosion performance, NiCr alloy coat have good erosion ability resistant to high temperatures, the protection effect of coating can be improved.
(4) prime coat NiCrAlY alloy has the thermal expansion coefficient between substrate and protective coating, can be effective
It realizes the transition of thermal expansion coefficient, reduces thermal stress and protective coating bring is endangered；NiCrAlY alloy prime coat can also mention
The bond strength of high coating and matrix, microelement Y can play the role of oxide pinning and refinement crystal grain, so as to improve painting
The adhesiveness of layer and prime coat；NiCrAlY alloy itself has good high temperature oxidation resistance, the Al in NiCrAlY alloy
The fine and close Al2O3 and Cr2O3 oxidation film with high-temperature stability can be formed with Cr, the further of oxidation corrosion gas can be prevented
It spreads inward, reduces the oxidation rate of prime coat, improve the ability of its resistance to high temperature oxidation, to extend the service life of coating.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the high-temp corrosion-resisting alloy coating of one embodiment of the invention boiler heating surface.
Fig. 2 is the microscopic appearance figure on alloy coat surface in one embodiment of the invention.
Fig. 3 is the corresponding energy spectrum diagram in alloy coat surface in one embodiment of the invention.
Fig. 4 is the microscopic appearance figure in alloy coat section in one embodiment of the invention.
Fig. 5 is alloy coat section power spectrum corresponding with Incone1625/NiCr alloy surface layer in one embodiment of the invention
Figure.
Fig. 6 is alloy coat section energy spectrum diagram corresponding with NiCrAlY alloy prime coat in one embodiment of the invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but the present invention is not limited to this
A little embodiments.
Embodiment 1
As shown in Figure 1, the high-temp corrosion-resisting alloy coating of the present embodiment boiler heating surface, is successively to beat from substrate 1 outward
Bottom 2 and surface layer 3, the prime coat 2 are NiCrAlY alloy coat, and the surface layer 3 is Incone1625/NiCr alloy coat；
The prime coat 2 with a thickness of 90-110 μm, the surface layer 3 with a thickness of 350-500 μm.
The preparation method of the high-temp corrosion-resisting alloy coating of the boiler heating surface of the present embodiment the following steps are included:
(1) Inconel625 alloy powder and NiCr alloy powder are mixed in proportion, obtained complex alloy powder,
Drying is stand-by.
75% Inconel625 alloy powder and 25% NiCr alloy powder are specifically weighed by mass percentage, are mixed
Uniformly, and average grain diameter is made as 25-55 μm of spherical complex alloy powder, dries moisture with 120 DEG C of temperature in baking oven, to
With.
(2) surface of boiler heating surface is cleaned, roughening treatment.
In the present embodiment, the boiler heating surface is using Q235,20# carbon steel as basis material, to its surface with third
Ketone clears up greasy dirt, then carries out blasting treatment using compressed air with white fused alumina sand, removes surface film oxide, is roughened workpiece surface.
Used sandblasting parameter: sand size be 40-50 mesh, pressure 0.2-0.5MPa, sandblasting angle be 80-100 °, sandblasting away from
From 50-70mm, blast time 20-50s.
(3) NiCrAlY alloy powder is sprayed in substrate surface using supersonic flame spraying technology, forms prime coat 2.
In the present embodiment, the substrate after cleaning, roughening is heated, the spray for carrying out prime coat after certain temperature again is preheating to
It applies, it is Ni-66.0%, Cr-20.0%, Al-13.0%, Y- that prime coat sprayed on material, which is with forming by mass percentage,
1.0%, and the NiCrAlY globular powder that average grain diameter is 25-55 μm, it is sprayed using supersonic flame spraying technology；Spray
It applies with a thickness of 90-110 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1720cfh；Fuel gas kerosene oil flow
For 6.3gph；Carrier gas flux is 23cfh；Powder feed rate is 60g/min；Rifle is away from being 400mm；Linear velocity is 500mm/s, spraying time
Number is 6 times.
(4) surface layer 3 is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology.
Incone1625/NiCr alloy surface layer, coating thickness are sprayed on prime coat using supersonic flame spraying technology
It is 350-500 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1730cfh；Fuel gas kerosene oil flow is
6.2gph；Carrier gas flux is 24cfh；Powder feed rate is 50g/min；Rifle is away from being 450mm；Linear velocity is 500mm/s, sprays number
It is 10 times.
(5) natural cooling to get the high-temperature corrosion resistance alloy coat.
As shown in Fig. 2, being the surface SEM microscopic appearance for the alloy coat that preparation method is prepared through this embodiment
Figure illustrates spraying effect it can be seen from the figure that the surface of the high-temp corrosion-resisting alloy coating of boiler heating surface is uniform, fine and close
Fabulous, coating has good protective effect to substrate.
As shown in figure 3, being the high-temp corrosion-resisting alloy coating surface EDS energy spectrum diagram of the present embodiment boiler heating surface, and right
It is analyzed the mass percent and number percent that obtain each atom, and detailed data see the table below 1.
The 1 each atom content in Incone1625/NiCr-NiCrAlY alloy coat surface of table
Next, it is micro- to the section progress SEM of the high-temp corrosion-resisting alloy coating of the present embodiment boiler heating surface, such as scheme
It is the section SEM microscopic appearance figure for the alloy coat that preparation method is prepared through this embodiment shown in 4, it can be with from figure
Find out, Incone1625/NiCr alloy surface layer is tightly covered on NiCrAlY alloy prime coat, and prime coat is in conjunction with substrate
Locate it is smooth, without hole, illustrate between coating have excellent binding force, good protecting effect can be played to substrate.
To in the high-temp corrosion-resisting alloy coating of the present embodiment boiler heating surface NiCrAlY alloy prime coat and
Incone1625/NiCr alloy surface layer carries out EDS energy spectrum analysis respectively, as shown in figure 5, being the present embodiment Incone1625/
The EDS energy spectrum analysis figure of NiCr alloy surface layer, as shown in fig. 6, being the EDS power spectrum point of the present embodiment NiCrAlY alloy prime coat
Analysis figure.
Embodiment 2
As shown in Figure 1, the high-temp corrosion-resisting alloy coating of the present embodiment boiler heating surface, is successively to beat from substrate 1 outward
Bottom 2 and surface layer 3, the prime coat 2 are NiCrAlY alloy coat, and the surface layer 3 is Incone1625/NiCr alloy coat；
The prime coat 2 with a thickness of 90-110 μm, the surface layer 3 with a thickness of 350-500 μm.
The preparation method of the high-temp corrosion-resisting alloy coating of the boiler heating surface of the present embodiment the following steps are included:
(1) Inconel625 alloy powder and NiCr alloy powder are mixed in proportion, obtained complex alloy powder,
Drying is stand-by.
60% Inconel625 alloy powder and 40% NiCr alloy powder are specifically weighed by mass percentage, are mixed
Uniformly, and average grain diameter is made as 25-55 μm of spherical composite powder, dries moisture with 120 DEG C of temperature in baking oven, for use.
(2) surface of waste incinerator heating surface is cleaned, roughening treatment.
In the present embodiment, the waste incinerator heating surface is carbon steel as basis material, derusted to its surface,
It degreases, blasting treatment, removes surface film oxide, be roughened workpiece surface.Used sandblasting parameter: sand size 40-50
Mesh, pressure 0.2-0.5MPa, sandblasting angle are 80-100 °, sandblasting distance 50-70mm, blast time 20-50s.
(3) NiCrAlY alloy powder is sprayed in the substrate surface using plasma spray technology, forms prime coat.
In the present embodiment, prime coat sprayed on material be Ni-66.0%, Cr-20.0% with forming by mass percentage,
Al-13.0%, Y-1.0%, average grain diameter are 25-55 μm of NiCrAlY globular powder, using supersonic flame spraying technology into
Row spraying；Coating thickness is 90-110 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1700cfh；Fuel gas
Kerosene oil flow is 6.0gph；Carrier gas flux is 21cfh；Powder feed rate is 55g/min；Rifle is away from being 300mm；Linear velocity is 450mm/
S, spraying number are 8 times.
(4) surface layer is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology.
Incone1625/NiCr alloy surface layer, coating thickness are sprayed on prime coat using supersonic flame spraying technology
It is 350-500 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1750cfh；Fuel gas kerosene oil flow is
6.5gph；Carrier gas flux is 25cfh；Powder feed rate is 65g/min；Rifle is away from being 500mm；Linear velocity is 550mm/s, sprays number
It is 8 times.
(5) natural cooling obtains the Incone1625/NiCr-NiCrAlY alloy coat of high-temperature corrosion resistance.
Embodiment 3
As shown in Figure 1, the high-temp corrosion-resisting alloy coating of the present embodiment boiler heating surface, is successively to beat from substrate 1 outward
Bottom 2 and surface layer 3, the prime coat 2 are NiCrAlY alloy coat, and the surface layer 3 is Incone1625/NiCr alloy coat；
The prime coat 2 with a thickness of 90-110 μm, the surface layer 3 with a thickness of 350-500 μm.
The preparation of the high-temperature corrosion resistance Incone1625/NiCr-NiCrAlY alloy coat of the boiler heating surface of the present embodiment
Method the following steps are included:
(1) Inconel625 alloy powder and NiCr alloy powder are mixed in proportion, obtained complex alloy powder,
Drying is stand-by.
90% Inconel625 alloy powder and 10% NiCr alloy powder are specifically weighed by mass percentage, are mixed
Uniformly, and average grain diameter is made as 25-55 μm of spherical complex alloy powder, dries moisture with 120 DEG C of temperature in baking oven, to
With.
(2) surface of waste incinerator heating surface is cleaned, roughening treatment.
In the present embodiment, the waste incinerator heating surface is using steel alloy as basis material, to its topical oil
Dirty cleaning agent clears up greasy dirt, and greasy dirt detergent used can be acetone, kerosene, gasoline, organic diluent, banana oil etc., then
Blasting treatment is carried out using compressed air with white fused alumina sand or palm fibre beautiful sand, surface film oxide is removed, is roughened workpiece surface.It is used
Sandblasting parameter: sand size be 40-50 mesh, pressure 0.2-0.5MPa, sandblasting angle be 80-100 °, sandblasting distance 50-
70mm, blast time 20-50s.
(3) NiCrAlY alloy powder is sprayed in the substrate surface using plasma spray technology, forms prime coat.
In the present embodiment, prime coat sprayed on material be Ni-66.0%, Cr-20.0% with forming by mass percentage,
Al-13.0%, Y-1.0%, average grain diameter are 25-55 μm of NiCrAlY globular powder, using supersonic flame spraying technology into
Row spraying；Coating thickness is 90-110 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1750cfh；Fuel gas
Kerosene oil flow is 6.5gph；Carrier gas flux is 25cfh；Powder feed rate is 65g/min；Rifle is away from being 500mm；Linear velocity is 550mm/
S, spraying number are 4 times.
(4) surface layer is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology.
Incone1625/NiCr alloy surface layer, coating thickness are sprayed on prime coat using supersonic flame spraying technology
It is 350-500 μm, the technological parameter of spraying are as follows: combustion-supporting gas oxygen flow is 1700cfh；Fuel gas kerosene oil flow is
6.0gph；Carrier gas flux is 21cfh；Powder feed rate is 55g/min；Rifle is away from being 300mm；Linear velocity is 450mm/s, sprays number
It is 12 times.
(5) natural cooling to get the high-temperature corrosion resistance alloy coat.
High temperature corrosion test
Using the common coating of the embodiment 1-3 alloy coat prepared and comparative example 1-2 as test sample, it is placed in simulation bar
In part, high temperature corrosion test is carried out, test result is as shown in table 2.
Comparative example 1 is the Incone1625/NiCr alloy coat sprayed in substrate, and coating layer thickness is 350-500 μm.
The coating of comparative example 2 includes that prime coat and surface layer are successively sprayed in substrate, and wherein prime coat is NiCrAlY alloy
Coating, with a thickness of 90-110 μm；Surface layer is Incone1625 alloy coat, with a thickness of 350-500 μm.
Simulated conditions are as follows: temperature: 800 DEG C, chlorine corruption condition: specimen surface coats about 2mg/cm2Salt-mixture (NaCl:
NaSO4Mass ratio 1:3 is prepared)；Simulated flue gas environment (CO2: 15.0%；O2: 3.5-5.0%；SO2: 0.15%；N2: surplus), place
Manage the time: 200h.
The sample of the embodiment of table 2 and comparative example carries out the result of high temperature corrosion test
| Test sample | Corrosion layer thickness | Surface topography |
| Embodiment 1 | 40μm | Without peeling trace |
| Embodiment 2 | 70μm | Without peeling trace |
| Embodiment 3 | 50μm | Without peeling trace |
| Comparative example 1 | 130μm | Local corrosion product falls off |
| Comparative example 2 | 100μm | Without peeling trace |
Passing through table 2, it can be appreciated that the bond strength of coating and matrix can be improved in prime coat NiCrAlY alloy, this
The coating of the invention coating than in the prior art has more chlorine-resistant corrosive nature under high temperature environment.
The bond strength of coating and matrix can be improved in NiCrAlY alloy, and the effective transition for realizing thermal expansion coefficient subtracts
Harm of the small thermal stress to protective coating, NiCrAlY alloy also have the function of anti-oxidation protection matrix.NiCr alloy can increase
The binding force of strong Incone1625 alloy in the coating, reduces coating porosity, the excessive influence coating high temperature resistant of NiCr alloy ratio
Chlorine corrosion performance.The Incone1625/NiCr-NiCrAlY Alloy Composite Coating of high temperature chlorine corrosion resistant can effectively extend rubbish and burn
Service life of the burning boiler under the mal-conditions such as the high chlorine of high temperature.
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
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. high-temp corrosion-resisting alloy coating, which is characterized in that described to beat including the prime coat and surface layer being successively coated in substrate
Bottom is NiCrAlY alloy coat, and the surface layer is Incone1625/NiCr alloy coat；The material of the surface layer is
Incone1625 alloy powder and NiCr alloy powder press (60wt%-90wt%): (10wt%-40wt%) mixture.
2. high-temp corrosion-resisting alloy coating according to claim 1, which is characterized in that the material of the prime coat is average
25-55 μm of partial size of spherical NiCrAlY alloy powder；The material of the surface layer be the Incone1625 alloy powder with it is described
NiCr alloy powder is uniformly mixed spherical complex alloy powder obtained, and the average grain diameter of the spherical complex alloy powder is
25-55μm。
3. according to claim 1 or 2 any high-temp corrosion-resisting alloy coatings, which is characterized in that the thickness of the prime coat
Degree be 90-110 μm, the surface layer with a thickness of 350-500 μm.
4. the preparation method of the described in any item high-temp corrosion-resisting alloy coatings of claim 1-3, which is characterized in that including following
Step:
(1) Incone1625 alloy powder and NiCr alloy powder are mixed in proportion, be made spherical complex alloy powder,
Drying is stand-by；
(2) substrate surface is cleaned, roughening treatment；
(3) NiCrAlY alloy powder is sprayed in the substrate surface using plasma spray technology, forms prime coat；
(4) surface layer is formed in spraying the spherical complex alloy powder on the prime coat using plasma spray technology；
(5) alloy coat to get the high-temperature corrosion resistance is cooled down.
5. the preparation method of high-temp corrosion-resisting alloy coating according to claim 4, which is characterized in that the step (1)
In Inconel625 alloy powder and NiCr alloy powder ratio be (60wt%-90wt%): (10wt%-40wt%),
The average grain diameter of the spherical complex alloy powder is 25-55 μm；The NiCrAlY alloy powder is 25-55 μm of average grain diameter
Globular powder.
6. the preparation method of the high-temp corrosion-resisting alloy coating of boiler heating surface according to claim 4, which is characterized in that
The coating thickness of the prime coat is 90-110 μm；The surface layer coating thickness is 350-500 μm.
7. the preparation method of the high-temp corrosion-resisting alloy coating of boiler heating surface according to claim 4, which is characterized in that
The plasma spray technology is supersonic flame spraying technology.
8. the preparation method of the high-temp corrosion-resisting alloy coating of boiler heating surface according to claim 7, which is characterized in that
The technological parameter of the supersonic flame spraying technology are as follows: combustion-supporting gas oxygen flow is 1700~1750cfh；Fuel gas coal
Oil stream amount is 6.0~6.5gph；Carrier gas flux is 21~25cfh；Powder feed rate is 55~65g/min；Rifle is away from being 300-
500mm；Linear velocity is 450-550mm/s；Spraying number is 4-8 times when spraying prime coat in the step (3)；The step
(4) spraying number in when spraying surface is 8-12 times.
9. the preparation method of the high-temp corrosion-resisting alloy coating of boiler heating surface according to claim 4, which is characterized in that
In step (2), it is described substrate surface is cleaned, roughening treatment the step of include: first removing substrate surface greasy dirt, then to base
Bottom surface carries out blasting treatment, removes substrate surface oxidation film, is roughened substrate surface；The technological parameter of the blasting treatment are as follows:
Sand size is 40-50 mesh, and pressure 0.2-0.5MPa, sandblasting angle is 80-100 °, sandblasting distance 50-70mm, blast time
For 20-50s.
10. special according to the preparation method of the high-temp corrosion-resisting alloy coating of any boiler heating surface of claim 4-9
Sign is, heats to the substrate after the roughening treatment, carries out the spraying of NiCrAlY alloy powder after preheating again, spraying
Method is sprayed using HVOF neutral flame.
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| CN108220857A (en) * | 2018-01-04 | 2018-06-29 | 西安热工研究院有限公司 | The anti-chlorine corrosion double-layer structure alloy coat of waste incinerator heating surface and preparation method |
| CN108796334A (en) * | 2018-05-25 | 2018-11-13 | 常熟浦发第二热电能源有限公司 | A kind of alloy coat of high-temperature corrosion resistance for boiler of power plant pipeline |
| CN110144538B (en) * | 2019-05-27 | 2021-04-16 | 武汉材料保护研究所有限公司 | Composite thermal spraying repair method for surface of hydraulic support upright post |
| CN113337791B (en) * | 2020-02-18 | 2023-08-29 | 上海电力大学 | Preparation method of thermal barrier coating for boiler protection |
| CN111964479A (en) * | 2020-08-20 | 2020-11-20 | 广东博盈特焊技术股份有限公司 | High-temperature corrosion-resistant and erosion-resistant coiled pipe, coiled pipe group and manufacturing method thereof |
| CN112481578B (en) * | 2020-11-20 | 2022-01-14 | 华北电力大学 | Boiler flue equal-life high-temperature anti-corrosion coating composite material and application thereof |
| CN114411145B (en) * | 2021-12-16 | 2024-04-19 | 中北大学 | Method for reducing cracks of cladding coating on stainless steel surface under high-temperature service |
| CN115710419B (en) * | 2022-11-24 | 2024-08-16 | 杭州老板电器股份有限公司 | Thermosetting composite material, preparation method thereof, knob and kitchen range knob |
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| EP1493843A1 (en) * | 2003-07-03 | 2005-01-05 | ALSTOM Technology Ltd | Coated metallic component |
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