CN116144986A - High-temperature-resistant hydrochloric acid corrosion coating and preparation method thereof - Google Patents

High-temperature-resistant hydrochloric acid corrosion coating and preparation method thereof Download PDF

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Publication number
CN116144986A
CN116144986A CN202310262221.5A CN202310262221A CN116144986A CN 116144986 A CN116144986 A CN 116144986A CN 202310262221 A CN202310262221 A CN 202310262221A CN 116144986 A CN116144986 A CN 116144986A
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coating
hydrochloric acid
acid corrosion
temperature
preparing
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杨康
张世宏
陈诚
刘侠
薛召露
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Anhui University of Technology AHUT
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/065—Spherical particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

The invention relates to the technical field of corrosion-resistant coatings, in particular to a high-temperature-resistant hydrochloric acid corrosion-resistant coating and a preparation method thereof, comprising the following steps: s1: preparing spraying powder: preparing spherical spraying powder with the particle size distribution of 15-45 mu m from the Ni-Mo-based superalloy blocks by means of vacuum gas atomization; s2: preparing a Ni-Mo-based superalloy coating: 1) sand blasting pretreatment is carried out on the surface of a substrate, 2) preheating is carried out on spraying powder for more than 2 hours at 80+/-10 ℃, and 3) supersonic flame spraying is carried out on the substrate subjected to sand blasting treatment; s3: heat treatment strengthening coating: carrying out vacuum heat treatment strengthening on the sprayed coating sample to obtain a coating with excellent high-temperature resistance and hydrochloric acid corrosion resistance, and treating the surface so as to meet the roughness requirement; the method promotes metallurgical bonding of the coating/matrix interface and the particle/particle interface, reduces the porosity of the coating, greatly improves the high-temperature hydrochloric acid corrosion resistance of the coating, and has simple process and low cost.

Description

High-temperature-resistant hydrochloric acid corrosion coating and preparation method thereof
Technical Field
The invention relates to the technical field of corrosion-resistant coatings, in particular to a high-temperature-resistant hydrochloric acid corrosion-resistant coating and a preparation method thereof.
Background
With the great development of industries such as petroleum, chemical industry, medicine, clean energy and the like, the medium environment where material equipment is located is more and more complex, and the corrosion resistance of engineering materials is more and more required. In engineering design, the working condition of taking hydrochloric acid as a reaction medium can be frequently met. In hydrochloric acid media, most commonly used metals and alloys are difficult to withstand against his attack. When the temperature/concentration of the hydrochloric acid is higher or air and FeCl exist in the medium 3 When the oxidizing salts are equal, the corrosion condition becomes very severe and the corrosion phenomenon is more serious.
Although some nonmetallic materials have better corrosion resistance than metallic materials in hydrochloric acid medium from the standpoint of corrosion resistance alone, metallic materials are better than nonmetallic materials in terms of comprehensive properties such as machining, wear resistance, thermal stability, etc., and are also used in a much wider range. However, some common metal materials cannot be used due to poor corrosion resistance, very few special metals such as titanium, zirconium, tantalum and the like have strong passivation tendency, and have very good corrosion protection effect in a hydrochloric acid environment, but the materials are very expensive, which greatly limits practical application. The nickel-based alloy, molybdenum-based alloy and other alloys have strong thermodynamic stability, and are also frequently used hydrochloric acid corrosion resistant materials, but the materials are still expensive, and the materials are directly used for manufacturing equipment or structural members, so that the cost is greatly increased.
Therefore, a novel high-temperature hydrochloric acid corrosion resistant coating which has simple preparation process, good bonding strength with matrixes such as spheroidal graphite cast iron and the like and high performance is developed, and the novel high-temperature hydrochloric acid corrosion resistant coating has important technical value and application prospect for corrosion resistant application of spheroidal graphite cast iron and other steel material equipment and parts with low price.
In view of the above drawbacks, the present inventors have finally achieved the present invention through long-time studies and practices.
Disclosure of Invention
The invention aims to solve the problem of how to prepare a high-performance coating which has good bonding strength with a base body such as spheroidal graphite cast iron and the like and has high-temperature hydrochloric acid corrosion resistance, and provides a high-temperature hydrochloric acid corrosion resistance coating and a preparation method thereof.
In order to achieve the aim, the invention discloses a high-temperature hydrochloric acid corrosion resistant coating, which is a Ni-Mo-based superalloy coating and comprises the following components: mo:28wt.% Fe:1.5wt.%, cr:0.5wt.%, balance Ni.
The invention also discloses a preparation method of the high-temperature-resistant hydrochloric acid corrosion-resistant coating, which comprises the following steps:
s1: cleaning the surface of the Ni-Mo-based superalloy block by using acetone, and carrying out vacuum gas atomization powder making to obtain spherical powder with the granularity of 15-45 mu m;
s2: preparing a Ni-Mo-based superalloy coating: pre-treating the surface of the matrix by sand blasting, preheating spraying powder for more than 2 hours at 80+/-10 ℃, and performing supersonic flame spraying on the matrix subjected to sand blasting;
s3: and (3) carrying out vacuum heat treatment strengthening on the coating sample subjected to the ultrasonic flame spraying to obtain a high-temperature-resistant hydrochloric acid corrosion-resistant coating, and treating the surface according to the roughness requirement. .
In the step S1, in the vacuum gas atomization process, a vacuum pump is utilized to enable the vacuum degree in the smelting chamber and the atomization chamber to be lower than 0.01Pa, and N 2 For gas atomization, the tapping temperature is 1600 ℃, the atomization pressure is 5MPa, and the inner diameter of a discharge spout is 4.5mm.
In the step S1, the surface roughness of the substrate after the sand blasting pretreatment is 0.1-0.3 mu m, and sand blasting parameters are set as follows: the sand blasting material is 24-mesh white corundum, the angle of a spray gun is 90+/-10 degrees, and the air pressure is 5kg/cm 2 Spray gunThe distance from the surface of the cold roll is 450-550 mm.
The substrate in the step S2 is spheroidal graphite cast iron.
The thickness of the coating after the ultrasonic flame spraying in the step S3 is 300 mu m, and the spraying parameters are set as follows: powder feeding rate 80g/min and kerosene flow 28m 3 /h, oxygen flow 53m 3 And/h, the spraying distance is 350mm, the moving speed of the spray gun is 800mm/s, and the spraying times are 14-16 times.
The vacuum heat treatment parameters in the step S3 are as follows: the temperature is 850 ℃ and the time is 3 hours.
The invention also discloses application of the high-temperature-resistant hydrochloric acid corrosion-resistant coating in the corrosion-resistant field of spheroidal graphite cast iron and other steel material equipment and parts.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the Ni-Mo-based superalloy block is prepared into spray powder in a vacuum atomization mode, a high-quality coating is successfully prepared on the surface of the spheroidal graphite cast iron by a supersonic flame spraying method, then vacuum heat treatment strengthening is carried out, and heat treatment parameters are further optimized on the basis. By strictly controlling the heat treatment temperature and time, the excessive diffusion of C, fe phase of the spheroidal graphite cast iron matrix in the coating is avoided, and the corrosion performance of the coating is further reduced. After the heat treatment of the optimized parameters, defects such as cracks, pores and the like in the coating are reduced, the inside of the coating becomes compact, the bonding mode between the coating and the matrix is changed from mechanical bonding to metallurgical bonding, so that the bonding strength of the coating/matrix is improved, and the formation of metallurgical bonding among particles in the coating is very beneficial to the improvement of the toughness of the coating. In addition, no matter the spray temperature is lower, the supersonic flame spray or the post-spray vacuum heat treatment is carried out, no impurity is introduced, the oxidation of the coating is greatly avoided, the cost is low, the automation is convenient to realize, and the process repeatability is good.
The high-temperature-resistant hydrochloric acid corrosion-resistant coating and the preparation method thereof have good performance, wherein compared with a Ni-Mo-based superalloy coating in a spraying state, the internal defects of the coating strengthened by vacuum heat treatment after spraying are reduced, the bonding strength of the coating is obviously improved, the toughness is obviously improved, and the high-temperature-resistant hydrochloric acid corrosion resistance of the coating is obviously improved. The concrete steps are as follows:
after the vacuum heat treatment strengthening of the optimized parameters, the interface bonding form of the coating and the matrix is changed, the mechanical bonding is changed into metallurgical bonding, and the bonding strength is improved from 57MPa to over 70MPa (glue breaking); the structural defect of the coating is obviously reduced, and the porosity is reduced from 1.27% to 0.3%; the ability of the vacuum heat treatment coating to resist high temperature hydrochloric acid corrosion with optimized parameters leads the spray-state coating remotely.
Drawings
FIG. 1 is a surface topography of a Ni-Mo-based superalloy spray powder used in the present invention;
FIG. 2 is an organizational chart of a supersonic flame sprayed coating and various heat treated coatings according to the present invention: (a) spray-on state, (b) 550 ℃ 3h heat-treated state, (c) 700 ℃ 3h heat-treated state, (d) 850 ℃ 3h heat-treated state, (e) 950 ℃ 3h heat-treated state, and EDS element profile;
FIG. 3 is an XRD of a supersonic flame sprayed coating of the present invention with each heat treated coating;
FIG. 4 is a graph showing electrochemical polarization of a supersonic flame sprayed coating of the present invention in a high temperature hydrochloric acid environment (temperature: 60 ℃, concentration: 15 wt.%);
FIG. 5 is an Electrochemical Impedance Spectrum (EIS) of a supersonic flame sprayed coating of the present invention and each heat treated coating in a high temperature hydrochloric acid environment (temperature: 60 ℃, concentration: 15 wt.%).
Detailed Description
The above and further technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
Example 1
The method comprises the steps of cleaning the surface of a Ni-Mo-based superalloy block body by using acetone, powdering in a vacuum atomization mode, and enabling the vacuum degree of a smelting chamber and an atomization chamber to be lower than 0.01Pa and N in a vacuum air atomization process by using a vacuum pump 2 For gas atomization, the tapping temperature is 1600 ℃, the atomization pressure is 5MPa, and the inner diameter of a discharge spout is 4.5mm. Finally, spherical powder with the granularity of 15-45 μm is obtained by sieving.
The preparation method of the Ni-Mo-based superalloy coating mainly comprises the following steps:
1) The base spheroidal graphite cast iron is subjected to sand blasting treatment by using 24-mesh white corundum, the angle of a spray gun is 90+/-10 DEG, and the air pressure is 5kg/cm 2 The distance from the spray gun to the surface of the cold roll is 450-550 mm, so that the surface roughness (Ra) of the substrate is 0.1-0.3 mu m;
2) Preheating Ni-Mo-based superalloy powder at 80+/-10 ℃ for more than 2 hours;
3) Carrying out supersonic flame spraying, wherein the powder feeding rate is 80g/min, and the kerosene flow is 28m 3 /h, oxygen flow 53m 3 And (3) preparing a coating with the thickness of 300 mu m on the surface of the substrate by spraying at the spraying distance of 350mm, the moving speed of the spray gun of 800mm/s and the spraying times of 14-16 times.
The method can effectively prepare the Ni-Mo-based superalloy coating with compact tissue structure and high bonding strength. Too thick a coating results in an increased crack source and excessive residual tensile stress, the coating is liable to peel off, and too thin a coating cannot withstand long-term corrosion in practical application, which will affect the service life of the coating, and the thickness of the coating is preferably 300 μm.
And (3) carrying out post-spray vacuum heat treatment strengthening on the coating sample subjected to the ultrasonic flame spraying, wherein the heat treatment temperature is 850 ℃ and the time is 3 hours.
Example 2
The present example likewise uses Ni-Mo-based superalloy powders with a particle size of 15-45 μm. In contrast to example 1, post-spray vacuum heat treatment was not performed. The other steps were the same as in example 1.
Example 3
The present example likewise uses Ni-Mo-based superalloy powders with a particle size of 15-45 μm. Relative to example 2, the kerosene flow during the supersonic flame spraying was changed to 26m 3 And/h, other spraying parameters remain unchanged. The other steps were the same as in example 2.
Example 4
The present example likewise uses Ni-Mo-based superalloy powders with a particle size of 15-45 μm. Compared with the example 2, the spraying distance in the ultrasonic flame spraying process is changed to 380mm, and other spraying parameters are kept unchanged. The other steps were the same as in example 2.
Example 5
The present example likewise uses Ni-Mo-based superalloy powders with a particle size of 15-45 μm. Compared with the example 2, the powder feeding rate in the ultrasonic flame spraying process is changed to 100g/min, and other spraying parameters are kept unchanged. The other steps were the same as in example 2.
As can be seen from the comparison of the coating porosity, fracture toughness and bonding strength under the various spraying parameters in Table 1, the optimal supersonic flame spraying parameters for the Ni-Mo based superalloy powder in the present invention are: powder feeding rate 80g/min and kerosene flow 28m 3 And/h, spraying distance is 350mm.
Example 6
The same Ni-Mo-based superalloy powder was used in this example. The post-spray vacuum heat treatment time was changed to 3 hours and the heat treatment temperature was unchanged (550 ℃ C.) with respect to example 1. The other steps were the same as in example 1.
Example 7
The same Ni-Mo-based superalloy powder is used in this example, with a grain size of 15-45 μm. In comparative example 1, the post-spray vacuum heat treatment time was changed to 3 hours, and the heat treatment temperature was unchanged (700 ℃). The other steps were the same as in example 1.
Example 8
The same Ni-Mo-based superalloy powder is used in this example, with a grain size of 15-45 μm. In comparative example 1, the post-spray vacuum heat treatment time was changed to 3 hours, and the heat treatment temperature was unchanged (950 ℃ C.). The other steps were the same as in example 1.
The porosity, fracture toughness and bond strength of the supersonic flame sprayed coating at different spray process parameters in examples 2-5 are shown in table 1.
Table 1 supersonic flame sprayed coating porosity, fracture toughness and bond Strength at different spray Process parameters in examples 2-5
Porosity% Fracture toughness MPa.m 1/2 Bond strength MPa
Example 2 1.27 3.94 57.3
Example 3 1.37 3.48 41.6
Example 4 1.52 3.11 40.5
Example 5 1.33 3.49 49.9
The self-etching current density (I) corresponding to the electrochemical polarization curve of each of the heat-treated coatings in examples 1, 6, 7, and 8 was determined under the high-temperature hydrochloric acid atmosphere (temperature: 60 ℃ C., concentration: 15 wt.%) at supersonic flame sprayed corr ) And self-corrosion potential (E corr ) As shown in table 2.
Table 2 electrochemical polarization of supersonic flame sprayed and heat treated coatings of examples 1, 6, 7, 8 under high temperature hydrochloric acid environment (temperature: 60 ℃, concentration: 15 wt.%)Curve corresponding self-etching current density (I) corr ) And self-corrosion potential (E corr )
Figure BDA0004131651080000051
Comparative examples 1, 6, 7, 8, it was found that the temperature parameters of the vacuum heat treatment had a significant effect on the texture properties of the ni—mo based superalloy coating. As can be seen from fig. 2, the post-spray vacuum heat treatment strengthening can reduce defects such as voids and cracks in the coating, and the interface between the coating/substrate and the inter-particle interface in the coating after the heat treatment becomes more blurred, which means that the interface bonding mode is changed from mechanical bonding to metallurgical bonding, but micropores in the coating are aggregated to form pores with further increase of the heat treatment temperature (950 ℃), so that the porosity is increased, which has a negative influence on the corrosion performance of the coating. As can be seen from fig. 2 and 3, a certain width of diffusion of C, fe occurs at the coating/substrate interface, which is not evident at the parameters of 550 ℃ and 700 ℃, but the diffusion becomes thicker as the temperature increases, and even at the parameters of 950 ℃ the diffusion layer diffuses throughout the coating. Diffusion of elements at the coating/matrix interface contributes to improved interfacial bond strength, but C, fe phase infiltrates the coating forming NiFe and Mo 2 And C phase, the corrosion performance of the coating is obviously reduced. As can be seen from the combination of table 2, fig. 4 and fig. 5, the corrosion resistance of the coating was greatly improved after the heat treatment, became better with the increase of the heat treatment temperature and reached the optimum at the 850 ℃ parameter, but the corrosion resistance of the coating was severely reduced even without passivation zone when the heat treatment temperature was increased to 950 ℃. The heat treatment temperature needs to be strictly controlled.
The foregoing description of the preferred embodiment of the invention is merely illustrative of the invention and is not intended to be limiting. It will be appreciated by persons skilled in the art that many variations, modifications, and even equivalents may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. The high-temperature hydrochloric acid corrosion resistant coating is characterized by being a Ni-Mo-based superalloy coating and comprising the following components: mo:28wt.% Fe:1.5wt.%, cr:0.5wt.%, balance Ni.
2. A method of preparing a high temperature hydrochloric acid corrosion resistant coating as claimed in claim 1, comprising the steps of:
s1: cleaning the surface of the Ni-Mo-based superalloy block by using acetone, and carrying out vacuum gas atomization powder making to obtain spherical powder with the granularity of 15-45 mu m;
s2: preparing a Ni-Mo-based superalloy coating: pre-treating the surface of the matrix by sand blasting, preheating spraying powder for more than 2 hours at 80+/-10 ℃, and performing supersonic flame spraying on the matrix subjected to sand blasting;
s3: and (3) carrying out vacuum heat treatment strengthening on the coating sample subjected to the ultrasonic flame spraying to obtain the high-temperature-resistant hydrochloric acid corrosion-resistant coating.
3. The method for preparing a high temperature resistant hydrochloric acid corrosion resistant coating according to claim 2, wherein in the step S1, in the vacuum gas atomization process, a vacuum pump is used to make the vacuum degree in the melting chamber and the atomization chamber lower than 0.01pa, n 2 For gas atomization, the tapping temperature is 1600 ℃, the atomization pressure is 5MPa, and the inner diameter of a discharge spout is 4.5mm.
4. The method for preparing a high temperature hydrochloric acid corrosion resistant coating according to claim 2, wherein in the step S1, the surface roughness of the substrate after the sand blasting pretreatment is 0.1-0.3 μm, and the sand blasting parameters are set as follows: the sand blasting material is 24-mesh white corundum, the angle of a spray gun is 90+/-10 degrees, and the air pressure is 5kg/cm 2 The distance from the spray gun to the surface of the cold roll is 450-550 mm.
5. The method for preparing a high temperature hydrochloric acid corrosion resistant coating according to claim 2, wherein the substrate in the step S2 is ductile iron.
6. The method for preparing a high temperature hydrochloric acid corrosion resistant coating according to claim 2, wherein the thickness of the coating after the ultrasonic flame spraying in the step S3 is 300 μm, and the spraying parameters are set as follows: powder feeding rate 80g/min and kerosene flow 28m 3 /h, oxygen flow 53m 3 And/h, the spraying distance is 350mm, the moving speed of the spray gun is 800mm/s, and the spraying times are 14-16 times.
7. The method for preparing a high temperature resistant hydrochloric acid corrosion resistant coating according to claim 2, wherein the vacuum heat treatment parameters in step S3 are as follows: the temperature is 850 ℃ and the time is 3 hours.
8. Use of the high temperature hydrochloric acid corrosion resistant coating of claim 1 in the corrosion resistant field of spheroidal graphite cast iron and other steel material equipment and parts.
CN202310262221.5A 2023-03-17 2023-03-17 High-temperature-resistant hydrochloric acid corrosion coating and preparation method thereof Withdrawn CN116144986A (en)

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Application publication date: 20230523