CN115541840A - Method for predicting service life of aluminized coating - Google Patents

Method for predicting service life of aluminized coating Download PDF

Info

Publication number
CN115541840A
CN115541840A CN202211333289.XA CN202211333289A CN115541840A CN 115541840 A CN115541840 A CN 115541840A CN 202211333289 A CN202211333289 A CN 202211333289A CN 115541840 A CN115541840 A CN 115541840A
Authority
CN
China
Prior art keywords
aluminized
coating
temperature
test piece
service life
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211333289.XA
Other languages
Chinese (zh)
Inventor
周永莉
鲁金涛
黄锦阳
党莹樱
杨珍
李沛
张鹏
严靖博
尹宏飞
刘鹏
李力敏
袁勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd, Huaneng Power International Inc filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202211333289.XA priority Critical patent/CN115541840A/en
Publication of CN115541840A publication Critical patent/CN115541840A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/208—Coatings, e.g. platings
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused
    • C23C10/48—Aluminising
    • C23C10/50—Aluminising of ferrous surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/32—Polishing; Etching
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34—Purifying; Cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

A method for predicting the service life of an aluminized coating belongs to the technical field of service life prediction and overcomes the defect that the service life of the aluminized coating cannot be predicted in the prior art. The method for predicting the service life of the aluminized coating comprises the following steps: step 1, obtaining an aluminized test piece; step 2, taking two groups of aluminized test pieces, and performing high-temperature steam oxidation experiments at the temperature of T1 and the temperature of T2 respectively; step 3, obtaining the mass percentages of aluminum at different x positions in the coating when the aluminized test piece is oxidized at the temperature of T1 for time T1 according to the step 2; at T2 temperature during oxidationThe mass percentage of aluminum at different x positions in the coating at the time t 2; fitting to obtain diffusion coefficients D1 and D2 under T1 and T2, and S1 and S2, eta 1 and eta 2; step 4, constant D is obtained 0 、Q 0 (ii) a Step 5, obtaining a diffusion coefficient D at any temperature T3; and 6, substituting the D3 into the formula (1), and calculating to obtain the time corresponding to the T3, namely the predicted service life of the coating of the aluminized test piece at the temperature of T3.

Description

Method for predicting service life of aluminized coating
Technical Field
The invention belongs to the technical field of service life prediction, and particularly relates to a service life prediction method of an aluminized coating.
Background
The boiler heating surfaces (water-cooled walls, superheaters, reheaters and economizers, also called as boiler four-tube) are key components in the boiler which are responsible for recovering coal-fired flue gas energy, heating steam and realizing energy conversion. Among the failure reasons of the four tubes of the high-parameter utility boiler, the flue gas corrosion caused by pulverized coal combustion outside the furnace tube and the high-temperature steam oxidation corrosion inside the furnace tube occupy important positions, and are also one of the essential reasons causing boiler explosion and leakage accidents. Due to the high steam parameters and high efficiency development of the thermal power plant unit, the service working condition of the boiler pipe is more complex and harsh, and the service performance of the used material under higher requirements also needs to be further improved.
The surface modification technology is a technology for strengthening the surface of a part or a material by changing the chemical composition or the tissue structure of the surface of the material or a workpiece, and can improve the high-temperature oxidation corrosion performance of the high-temperature alloy. Compared with the development of a higher-grade heating surface material, the surface modification technology can obviously improve the oxidation resistance and the corrosion resistance of the boiler tube on the basis of not reducing the mechanical property of an alloy matrix, not only solves the problem of oxidation/corrosion of the alloy of the existing boiler tube, but also provides technical support for the existing material to continuously serve in a higher-parameter unit.
The aluminum coating technology is an economic and effective way for remarkably improving the high-temperature oxidation resistance of the matrix without changing the mechanical property of the matrix, and is widely applied in the aerospace field at present. The key parts of the gas turbine have excellent oxidation resistance after being coated with aluminum, and can run for thousands of hours at the temperature of over 900 ℃. The excellent protection of the aluminide coating results from the slow growth of the oxide film, whereas the growth of alumina is temperature dependent, and when the temperature is reduced by 200 ℃, the growth of alumina can be reduced by several orders of magnitude, so that the service life of the aluminide coating applied to the boiler tube of a power station with lower temperature (< 700 ℃) can be greatly prolonged. The low-temperature aluminizing has lower diffusion rate, can obtain thinner coatings, and has no brittle phase precipitation, so that the steam oxidation performance can be obviously changed on the basis of not changing the structure and the mechanical property of a base material.
The P92-Al coating has good oxidation resistance. This is mainly because the water vapor in the initial stage of oxidation selectively oxidizes with the Al element in the coating to form a monomolecular oxide film, and then the film growth is realized by electrochemical reaction, and the growth rate is slow, and the Al element is not completely oxidized to Al 2 O 3 . On the one hand, al formed 2 O 3 The membrane can reduce the diffusion coefficient; on the other hand, the aluminum-rich layer which is not completely oxidized can also continue to be the alloyFormation of Al 2 O 3 The film provides a sufficient source of Al so that the P92-Al coating has excellent resistance to steam oxidation.
The failure mechanism of the aluminized coating under the high-temperature condition mainly comprises the following steps: a. the oxide film is peeled off, al element is diffused out to form new Al 2 O 3 A film; b. inter-diffusion with the matrix. When the P92-Al coating is subjected to steam oxidation at 650 ℃, a protective Al layer is rapidly formed on the surface 2 O 3 Film, although lower temperature, al 2 O 3 The film still had good adhesion and no peeling occurred during the test. This causes the degradation mechanism of the aluminide coating to manifest primarily as Al interdiffusion. However, the prior art cannot accurately predict the coating life of the aluminized coating.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the service life of the aluminized coating cannot be predicted in the prior art, thereby providing a service life prediction method for the aluminized coating.
Therefore, the invention provides the following technical scheme.
The invention provides a method for predicting the service life of an aluminized coating, which comprises the following steps:
step 1, obtaining an aluminized test piece;
step 2, taking two groups of aluminized test pieces, and performing a high-temperature steam oxidation experiment at the temperature of T1 and T2 respectively, wherein T2 is the highest temperature used by the aluminized test pieces, and T1= T2- (20-80 ℃);
and 3, the relation between the concentration of aluminum in the coating and the depth and the oxidation time accords with the following steps:
Figure BDA0003914418930000031
wherein x is the depth from a certain position in the coating to the surface of the coating, C is the mass percent of aluminum at the position x in the coating, D is the diffusion coefficient, t is the oxidation time, S is the total amount of Al in the coating, and eta is the calibration displacement of a Gaussian distribution center;
obtaining the mass percentage of aluminum at different x positions in the coating when the aluminized test piece is oxidized at the temperature of T1 for time T1 according to the step 2; the mass percent of aluminum at different x locations in the coating at the temperature T2 for the oxidation time T2; substituting the data obtained in the step 2 into an equation (1), and fitting to obtain diffusion coefficients D1 and D2 under T1 and T2, and S1 and S2 and eta 1 and eta 2;
step 4, constant is obtained
Figure BDA0003914418930000032
Diffusion activation energy
Figure BDA0003914418930000033
Step 5, according to lnD3= lnD 0 -Q 0 (RT 3) obtaining the diffusion coefficient D3 at any temperature T3; r is a thermodynamic constant;
and 6, substituting D3 into the formula (1), wherein C is the critical content capable of forming alumina, S and eta are values corresponding to T1 or T2 which are not lower than T3, x is 0, and the time corresponding to T3 is obtained by calculation, namely the predicted service life of the coating of the aluminized test piece at the temperature of T3.
Further, the step 1 comprises:
s101, pretreating a test piece to be aluminized, embedding the test piece to be aluminized into a powder tank with aluminized powder, and compacting;
s102, placing the compacted powder tank in a heat treatment furnace, and sintering in a protective gas atmosphere;
and S103, cooling to room temperature along with the furnace to obtain the aluminized test piece.
Further, in S101, the preprocessing includes: and (3) degreasing and derusting the test piece to be aluminized, and then placing the test piece into a resistance furnace at the temperature of 100-200 ℃ for preheating for 20-60 min.
Further, degreasing and derusting the aluminized test piece by using a pickling solution, wherein the pickling solution is a mixed solution of sulfuric acid, hydrochloric acid and an emulsifier, and the temperature of the pickling solution is 80-95 ℃.
Further, in S101, the aluminized powder includes 98 to 99wt.% of FeAl powder and 1 to 2wt.% of NH 4 Cl。
Further, S102, after the compacted powder tank is placed in a heat treatment furnace, a valve is closed, protective gas is introduced for 30-60min to exhaust air, and the temperature is raised to the sintering temperature under the protective gas atmosphere for sintering.
Further, the sintering condition is that the sintering is carried out for 4-8h at 750-780 ℃.
Further, the protective gas is argon.
Further, the high-temperature steam oxidation experimental conditions in the step 2 are as follows: dynamic 100% saturated steam, pressure 0.1-30 MPa, steam flow rate 100-120ml/s.
Further, analyzing the diffusion depth of the coating on the aluminized test piece by using a scanning electron microscope;
and (4) carrying out component analysis on positions of different depths of the coating by adopting an energy spectrometer.
Exemplary emulsifiers are OP emulsifiers, such as the OP-3 to 50 series.
In S101, the ratio of the aluminized powder is: 99wt.% FeAl powder, 1wt.% NH 4 And (4) Cl. The mass ratio of iron to aluminum in the FeAl powder is 1:1.
the original thickness of the aluminized coating and the diffusion depth of the aluminized coating under different oxidation times can be analyzed by a Scanning Electron Microscope (SEM), and the components of the aluminized coating at different depth positions can be analyzed by an energy spectrometer.
The technical scheme of the invention has the following advantages:
the design life of boiler piping can typically reach 100kh. Whether the aluminized coating can maintain Al 2 O 3 The growth of oxide films, which provide good protection to the base steel, is an important issue for the application of this coating. The method for predicting the service life of the coating can predict whether the aluminized test piece meets the use requirements, and avoid the problem that the whole system cannot normally operate due to the insufficient service life of a piping system after use. Meanwhile, the method can also predict the concentration change of the coating Al after different oxidation times, thereby perfecting the aluminizing process, avoiding production waste, reducing the production cost and improving the production efficiency and the economic benefit of enterprises.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a scanning electron microscope image of the aluminized test piece obtained in step 1 of example 1.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not indicate specific experimental procedures or conditions, and can be performed according to the procedures or conditions of the conventional experimental procedures described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides a method for predicting the service life of an aluminized coating, which comprises the following steps:
step 1, obtaining an aluminized test piece:
s101, degreasing and derusting a test piece to be aluminized (T92 steel) by adopting a pickling solution, wherein the pickling solution comprises sulfuric acid (mass fraction is 98%), hydrochloric acid (mass fraction is 38%) and an OP emulsifier (model OP-10), the mass fractions are 15%, 10% and 1%, and the balance is water, and the temperature of the pickling solution is 90 ℃. Then, the test piece to be aluminized is placed in a resistance furnace at 200 ℃ to be preheated for 20min.
According to 99wt.% of FeAl powder (iron/aluminum ratio 1) 4 And (3) preparing embedded aluminized powder by Cl, filling the pretreated test piece into a stainless steel tank in a layering manner, and compacting.
S102, placing the embedded test piece to be aluminized in a heat treatment furnace, closing a valve, introducing argon for 30min to exhaust air, heating to 750 ℃ in an argon atmosphere, and sintering for 4h.
And S103, cooling the sample to room temperature along with the furnace, and taking out the sample to obtain the aluminized sample. The scanning electron micrograph is shown in FIG. 1.
And 2, taking two groups of aluminized test pieces, wherein each group comprises 10 aluminized test pieces, and performing high-temperature steam oxidation experiments on the two groups of aluminized test pieces at the temperatures of 650 ℃ and 700 ℃, wherein the steam oxidation experiments are dynamic 100% saturated steam experiments, the pressure is 0.1MPa, and the steam flow rate is 100ml/s, so that the service environment of the steam side of the boiler pipe of the power plant is simulated.
Obtaining the mass percentage values of aluminum at different depths of the aluminized test piece after oxidizing the aluminized test piece for 1000 hours at 700 ℃; and the mass percentage of the aluminum with different depths after the aluminized test piece is oxidized for 1000 hours at 650 ℃.
And 3, enabling the relation between the aluminum concentration in the coating and the depth and the oxidation time to accord with the following steps:
Figure BDA0003914418930000061
wherein x is the depth from a certain position in the coating to the surface of the coating, C is the mass percent of aluminum at the position x in the coating, D is the diffusion coefficient, t is the oxidation time, S is the total amount of Al in the coating, and eta is the calibration displacement of a Gaussian distribution center;
the data obtained in step 2 are substituted into formula (1), and the diffusion coefficients at T1=650 ℃ and T2=700 ℃ are fitted to D1:0.06332, D2:0.33724, and S1:897.09465, S2:698.54861 and η 1:7.84419,. Eta.2: 19.53143;
step 4, obtaining
Figure BDA0003914418930000071
Diffusion activation energy
Figure BDA0003914418930000072
During calculation, open temperatures 923.15K and 973.15K are adopted for T1 and T2.
Step 5, this exampleThe coating life at 600 ℃ is predicted, i.e. T3 is 600 ℃. According to lnD3= lnD 0 -Q 0 /(RT 3) diffusion coefficient D3 at any temperature was obtained to be 0.009816334; r is a thermodynamic constant;
and 6, substituting D3 into the formula (1), wherein C is 3% of critical content capable of forming alumina, S and eta are values corresponding to T1, x is 0, and the oxidation time corresponding to 600 ℃ is 1809000h through calculation, namely the service life of the calorized test piece coating predicted in the embodiment under the steam oxidation condition of 600 ℃ is 1809000h.
Example 2
This example provides a method for predicting the lifetime of an aluminized coating, steps 1 to 4 being substantially the same as in example 1, except that this example predicts a lifetime at 622 ℃.
Step 5, according to lnD3= lnD 0 -Q 0 (RT 3) diffusion coefficient D3 at any temperature was obtained to be 0.022872411; r is a thermodynamic constant; in this example T3 is 622 ℃.
And 6, substituting D3 into the formula (1), wherein C is 3% of critical content capable of forming alumina, S and eta are values corresponding to T1, x is 0, and the oxidation time corresponding to 622 ℃ is 776500h through calculation, namely the service life of the aluminized test piece coating predicted in the embodiment under the condition of steam oxidation at 622 ℃ is 776500h.
Example 3
This example provides a method for predicting the lifetime of an aluminized coating, steps 1 to 4 being substantially the same as in examples 1 and 2, except that this example predicts a lifetime at 650 ℃.
Step 5, according to lnD3= lnD 0 -Q 0 /(RT 3) diffusion coefficient D3 at any temperature of 0.06332 is obtained; r is a thermodynamic constant; in this example T3 is 650 ℃.
And 6, substituting D3 into the formula (1), wherein C is 3% of critical content capable of forming alumina, S and eta are values corresponding to T1, x is 0, and the oxidation time corresponding to 650 ℃ is 280000h through calculation, namely the service life of the aluminized test piece coating predicted by the embodiment under the condition of 650 ℃ steam oxidation is 280000h.
Example 4
This example provides a method for predicting the lifetime of an aluminized coating, steps 1-4 being substantially the same as in example 1, except that this example predicts a lifetime at 700 ℃.
Step 5, according to lnD3= lnD 0 -Q 0 (RT 3) diffusion coefficient D3 at any temperature was obtained to be 0.33724; r is a thermodynamic constant; in this example, T3 was 700 ℃.
And 6, substituting D3 into the formula (1), wherein C is 3% of critical content capable of forming alumina, S and eta are values corresponding to T2, x is 0, and the oxidation time corresponding to 700 ℃ is 52000h through calculation, namely the service life of the aluminized test piece coating predicted by the embodiment under the steam oxidation condition of 700 ℃ is 52000h.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (10)

1. A method for predicting the service life of an aluminized coating is characterized by comprising the following steps:
step 1, obtaining an aluminized test piece;
step 2, taking two groups of aluminized test pieces, and performing a high-temperature steam oxidation experiment at the temperature of T1 and T2 respectively, wherein T2 is the highest temperature used by the aluminized test pieces, and T1= T2- (20-80 ℃);
and 3, the coating meets the following relational expression:
Figure FDA0003914418920000011
wherein x is the depth from a certain position in the coating to the surface of the coating, C is the mass percent of aluminum at the position x in the coating, D is the diffusion coefficient, t is the oxidation time, S is the total amount of Al in the coating, and eta is the calibration displacement of a Gaussian distribution center;
obtaining the mass percentages of aluminum at different x positions in the coating when the aluminized test piece is oxidized at the temperature of T1 for the time T1 according to the step 2; mass percent of aluminum at different x positions in the coating at the oxidation time T2 at the temperature T2; substituting the data obtained in the step 2 into an equation (1), and fitting to obtain diffusion coefficients D1 and D2 under T1 and T2, and S1 and S2, and eta 1 and eta 2;
step 4, constant is obtained
Figure FDA0003914418920000012
Diffusion activation energy
Figure FDA0003914418920000013
Step 5, according to lnD3= lnD 0 -Q 0 (RT 3) obtaining the diffusion coefficient D3 at any temperature T3; r is a thermodynamic constant;
and 6, substituting D3 into the formula (1), wherein C is the critical content capable of forming alumina, S and eta are values corresponding to T1 or T2 which are not lower than T3, x is 0, and the time corresponding to T3 is obtained by calculation, namely the predicted service life of the coating of the aluminized test piece at the temperature of T3.
2. The method for predicting the service life of the aluminized coating according to claim 1, wherein the step 1 includes:
s101, pretreating a test piece to be aluminized, embedding the test piece to be aluminized into a powder tank with aluminized powder, and compacting;
s102, placing the compacted powder tank in a heat treatment furnace, and sintering in a protective gas atmosphere;
and S103, cooling to room temperature along with the furnace to obtain the aluminized test piece.
3. The method for predicting life of an aluminized coating according to claim 2, wherein in S101, the preprocessing includes: and (3) degreasing and derusting the test piece to be aluminized, and then placing the test piece into a resistance furnace at the temperature of 100-200 ℃ for preheating for 20-60 min.
4. The method for predicting the life of an aluminized coating according to claim 3, wherein the aluminized test piece is degreased and derusted by a pickling solution, the pickling solution is a mixed solution of sulfuric acid, hydrochloric acid and an emulsifier, and the temperature of the pickling solution is 80 to 95 ℃.
5. The method of claim 2, wherein in S101, the aluminized powder comprises 98-99 wt.% FeAl powder and 1-2 wt.% NH 4 Cl。
6. The method of claim 2, wherein step S102 comprises placing the compacted powder can in a heat treatment furnace, closing a valve, introducing a protective gas for 30-60min to exhaust air, and heating to a sintering temperature in a protective gas atmosphere for sintering.
7. The method for predicting the service life of the aluminized coating according to claim 6, wherein the sintering condition is sintering at 750-780 ℃ for 4-8h.
8. The method of claim 6, wherein the shielding gas is argon.
9. The method for predicting the service life of the aluminized coating according to claim 1, wherein the high-temperature steam oxidation experimental conditions in the step 2 are as follows: dynamic 100% saturated steam, pressure 0.1-30 MPa, steam flow rate 100-120ml/s.
10. The method for predicting the life of an aluminized coating according to claim 1, wherein the diffusion depth of the coating is analyzed by a scanning electron microscope for an aluminized test piece;
and (4) carrying out component analysis on positions of different depths of the coating by adopting an energy spectrometer.
CN202211333289.XA 2022-10-28 2022-10-28 Method for predicting service life of aluminized coating Pending CN115541840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211333289.XA CN115541840A (en) 2022-10-28 2022-10-28 Method for predicting service life of aluminized coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211333289.XA CN115541840A (en) 2022-10-28 2022-10-28 Method for predicting service life of aluminized coating

Publications (1)

Publication Number Publication Date
CN115541840A true CN115541840A (en) 2022-12-30

Family

ID=84717831

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211333289.XA Pending CN115541840A (en) 2022-10-28 2022-10-28 Method for predicting service life of aluminized coating

Country Status (1)

Country Link
CN (1) CN115541840A (en)

Similar Documents

Publication Publication Date Title
Wang et al. Oxidation resistance improvement of Zr-4 alloy in 1000° C steam environment using ZrO2/FeCrAl bilayer coating
Pint et al. Evaluation of iron-aluminide CVD coatings for high temperature corrosion protection
CN111161806B (en) Method for calculating oxide film thickness of martensitic heat-resistant steel under supercritical high-temperature steam
CN102400099A (en) Technology for preparing nuclear fission reactor fuel clad surface CrAlSiN gradient coating
CN110359006A (en) A method of improving the resistance to liquid metal corrosion of heat resisting steel
Luo et al. Preparation technologies and performance studies of tritium permeation barriers for future nuclear fusion reactors
Li et al. State of the art overview material degradation in high-temperature supercritical CO2 environments
CN111020571A (en) Alloy powder for laser cladding of stainless steel surface and application thereof
Gui et al. Corrosion behavior of T91 tubing in high temperature supercritical carbon dioxide environment
CN115541840A (en) Method for predicting service life of aluminized coating
Gui et al. Effect of shot-peening on corrosion behavior of austenitic steel in supercritical carbon dioxide at 700° C
CN115491635A (en) Coating life prediction method
CN113981328A (en) Aluminum-containing austenitic stainless steel with surface spontaneously and continuously generating aluminum oxide film
CN115612979A (en) Coating life control method
CN110195228B (en) Molten aluminum corrosion-resistant coating and preparation method thereof
Pint et al. Exploring Material Solutions for Supercritical CO2 Applications above 800° C
Lin et al. High-temperature oxidation behavior of a cast Ti-47.5 Al-2.5 V-1.0 Cr-0.2 Zr alloy
CN116029086A (en) Service life control method of powder embedded aluminized coating
CN205893375U (en) Surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation
CN112921299B (en) Preparation method of composite film on surface of zirconium cladding
CN205420524U (en) Titanium closes surface treatment device of compound nitridation of low pressure vacuum carburization
CN110218996B (en) Molten aluminum corrosion resistant roller
CN109190311B (en) Method for predicting oxide film peeling of austenitic heat-resistant steel for ultra-supercritical thermal power generating unit
Xu et al. Review on corrosion of alloys for application in supercritical carbon dioxide brayton cycle
CN201837301U (en) Sherardizing and flexible engineering urushiol phthalein anticorrosion coating

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination