Turboshaft engine part anti-corrosion coating for marine environment as well as preparation method and application of turboshaft engine part anti-corrosion coating

Abstract

The invention relates to the technical field of part corrosion protection, in particular to a turboshaft engine part anti-corrosion coating for a marine environment, a preparation method and application. The anti-corrosion coating is an inorganic salt anti-corrosion coating, the inorganic salt anti-corrosion coating comprises an inorganic salt anti-corrosion bottom layer and an inorganic salt anti-corrosion surface layer, and the inorganic salt anti-corrosion bottom layer comprises phosphate, aluminum powder and organic silicon; and the inorganic salt anti-corrosion surface layer comprises the following components: phosphate, organic silicon, inorganic silicon and iron-titanium oxide. After the inorganic salt anticorrosive coating is sprayed on the GH2909 part, the performance of the part is not influenced, but the corrosion resistance of the part can be obviously improved, and the salt corrosion resistance is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of parts corrosion protection, and in particular to an anti-corrosion coating for turboshaft engine parts for marine environments, a preparation method and an application thereof. Background Art

[0002] Turboshaft engines for marine environments need to be used and stored for a long time under marine climate conditions, and have the ability to work normally in harsh environments such as high temperature, high sunshine, cold, damp heat, mold, salt spray, sand and dust, rain, snow, fog, etc. Analysis and practice have found that the marine environment has the most serious corrosion damage to engine materials, coatings and structures, especially materials with poor corrosion resistance.

[0003] The hot end flow path parts of the engine are located inside the engine. Since the engine compressor impeller and turbine have a labyrinth seal structure, the hot end flow path parts are generally rarely directly exposed to the outside atmosphere. The inner sealing ring of the combustion guide belongs to the hot end flow path parts, and the operating temperature is relatively high. The engine works in a marine corrosive environment, and the environment contains a large amount of salt (such as NaCl, KCl, etc.). The combustion of aviation fuel will produce SO2, SO3, etc., and the reaction between the two can generate corrosive salts such as Na2SO4. These corrosive salts will cause thermal corrosion to the high-temperature alloy substrate and coating at a higher temperature (650℃~980℃), that is, gas thermal corrosion, which must be focused on. In addition, after the hot end non-rotating parts have been in service for a long time, salt substances may accumulate on the surface, which will cause salt corrosion to the substrate at high temperature, which should also be paid attention to and prevented.

[0004] Conventional organic coatings are not heat-resistant enough, resulting in no suitable protection for parts. They are prone to residual corrosion during field use: for example, a fuel-guided internal sealing ring part (material GH2909) was severely corroded after more than 90 hours of field use; at the same time, when this type of engine is in service in the marine environment, it is also affected by the local environment of the ship's surface, and the degree of corrosion is even more serious. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an anti-corrosion coating for turboshaft engine parts for marine environments, a preparation method and an application thereof, so as to solve the problem that the prior art directly uses GH2909 parts bare without spraying anti-corrosion coating on the outer surface, and the parts are seriously corroded during corrosion tests and field applications. The present invention provides the following technical solutions:

[0006] The present invention provides an anti-corrosion coating for turboshaft engine parts for use in a marine environment, characterized in that the anti-corrosion coating is an inorganic salt anti-corrosion coating, wherein the inorganic salt anti-corrosion coating comprises an inorganic salt anti-corrosion base layer and an inorganic salt anti-corrosion surface layer, the components of the inorganic salt anti-corrosion base layer comprise phosphate, aluminum powder and silicone; the components of the inorganic salt anti-corrosion surface layer comprise phosphate, silicone, inorganic silicon and iron-titanium oxide.

[0007] Preferably, the phosphates in the inorganic salt anticorrosive bottom layer and the inorganic salt anticorrosive surface layer are selected from one or more of aluminum phosphate, potassium phosphate or sodium phosphate;

[0008] The organic silicon in the inorganic salt anticorrosion base layer and the inorganic salt anticorrosion surface layer is methylphenyl silicon;

[0009] The inorganic silicon is selected from silicon dioxide or silicate.

[0010] Preferably, the methylphenylsilicone is selected from one or more of methylphenylsilane, methylphenylsilicone resin and methylphenylsilicone rubber;

[0011] The silicate is selected from one of sodium silicate, potassium silicate or aluminum silicate.

[0012] Preferably, the mass ratio of phosphate, aluminum powder and silicone in the inorganic salt anti-corrosion base layer is 3-7:2-6:1.

[0013] Preferably, the mass ratio of phosphate, organosilicon, inorganic silicon and iron-titanium oxide in the inorganic salt anti-corrosion surface layer is 7-11:4-8:1-3:2-5.

[0014] Preferably, the coating thickness of the inorganic salt anti-corrosion base layer and the inorganic salt anti-corrosion surface layer are both 15-30 μm.

[0015] The present invention also provides a method for preparing an anti-corrosion coating for turboshaft engine parts for use in a marine environment, the method comprising:

[0016] Performing a first pretreatment on the surface of turboshaft engine parts for marine environments;

[0017] Spraying an inorganic salt anti-corrosion base layer on the surface of the turboshaft engine parts for marine environment after the first pretreatment;

[0018] The surface of turboshaft engine parts for marine environment after spraying inorganic salt anti-corrosion bottom layer is subjected to second pretreatment and spraying inorganic salt anti-corrosion surface layer in sequence, wherein:

[0019] The main components of the inorganic salt anti-corrosion base layer and the inorganic anti-corrosion surface layer are inorganic aluminum phosphate coatings.

[0020] Preferably, the first pretreatment of the surface of the turboshaft engine part for marine environment comprises:

[0021] Remove oil and stains from the surface of turboshaft engine parts used in marine environments;

[0022] Dry the surface of turboshaft engine parts for marine environment after removing oil and stains at 40-60℃ for more than 0.5 hours;

[0023] Sand blasting is performed on the surface of turboshaft engine parts for marine environments after drying.

[0024] Preferably, the step of spraying the inorganic salt anticorrosive base layer comprises:

[0025] Mix the inorganic salt anti-corrosion coating evenly in a mixer;

[0026] Use a screen to filter the mixed inorganic salt anti-corrosion coating;

[0027] The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of the turboshaft engine parts for marine environment after the first pretreatment using a spray gun.

[0028] Preferably, the sieve is a 200-400 mesh sieve.

[0029] Preferably, the filtered inorganic salt anti-corrosion coating is sprayed evenly on the surface of the turboshaft engine parts for marine environment after the first pretreatment by a spray gun for multiple times, including:

[0030] After the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the first pretreatment, it is dried under predetermined conditions before the next spraying.

[0031] Preferably, the predetermined condition is: drying at 40-60° C. for 15-30 minutes.

[0032] Preferably, the second pretreatment step comprises:

[0033] After spraying the inorganic salt anti-corrosion primer, the surface of the turboshaft engine parts for marine environment is roughened, degreased and dried in sequence.

[0034] The surface of turboshaft engine parts for marine environment is roughened by sandpaper grinding or shot peening after spraying with inorganic salt anti-corrosion primer;

[0035] Remove oil and stains from the roughened surface of turboshaft engine parts for marine environments;

[0036] After drying to remove oil and stains, dry the surface of turboshaft engine parts for marine environment at 40-60℃ for more than 0.5 hour.

[0037] Preferably, the step of spraying the inorganic salt anticorrosive surface layer comprises:

[0038] Mix the inorganic salt anti-corrosion coating evenly in a mixer;

[0039] Use a screen to filter the mixed inorganic salt anti-corrosion coating;

[0040] The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of the turboshaft engine parts for marine environment after the second pretreatment using a spray gun.

[0041] Preferably, after the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the second pretreatment, it is dried under predetermined conditions before the next spraying.

[0042] The anti-corrosion coating of turboshaft engine parts for marine environment as described above is applied to the surface of the sealing ring of the engine for marine environment, wherein the sealing ring of the engine for marine environment is made of GH2909 material.

[0043] Technical effects and advantages of the present invention:

[0044] 1. After GH2909 parts are sprayed with inorganic salt anti-corrosion coating, it does not affect the performance of the parts, but can significantly improve the corrosion resistance of the parts, and the salt corrosion resistance is significantly improved.

[0045] 2. The inorganic salt coating can meet the high temperature use requirements of GH2909 parts.

[0046] 3. After the GH2909 parts are sprayed with inorganic salt anti-corrosion coating, the field anti-corrosion performance is significantly improved, ensuring the safe use of the engine.

[0047] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a first preprocessing flow chart provided in an embodiment of the present application;

[0049] Figure 2 is a second preprocessing flow chart provided in an embodiment of the present application;

[0050] Figure 3a The surface of the GH2909 sample provided in the embodiment of the present application is in the original state (no salt corrosion and no coating spraying);

[0051] Figure 3b The surface of the GH 2909 sample provided in the embodiment of the present application is not sprayed with a coating and is subjected to salt corrosion for 100 hours;

[0052] Figure 3c The surface of the GH 2909 sample provided in the embodiment of the present application is not sprayed with a coating and is subjected to salt corrosion for 100 hours and then alkali washing;

[0053] Figure 4a The cross section of the GH 2909 sample in the original state provided in the embodiment of the present application;

[0054] Figure 4b The cross section of the GH 2909 sample provided in the embodiment of the present application is not sprayed with a coating and is subjected to salt corrosion for 100 hours;

[0055] Figure 5a The surface of the GH 2909 sample provided in the embodiment of the present application in its original state (without salt corrosion and spray coating);

[0056] Figure 5b The surface of the GH 2909 sample provided in the embodiment of the present application after being sprayed with a coating and then subjected to salt corrosion for 100 hours;

[0057] Figure 5c The surface of the GH 2909 sample provided in the embodiment of the present application is sprayed with a coating and subjected to salt corrosion for 100 hours and then alkali-washed;

[0058] Figure 6a The cross section of the GH 2909 sample in the original state provided in the embodiment of the present application;

[0059] Figure 6b The cross section of the GH 2909 sample provided in the embodiment of the present application after spraying the coating and subjecting it to salt corrosion for 100 hours. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In order to solve the deficiencies of the prior art, the present invention discloses an anti-corrosion coating for turboshaft engine parts for marine environments, wherein the inorganic salt anti-corrosion coating comprises an inorganic salt anti-corrosion base layer and an inorganic salt anti-corrosion surface layer, and the components of the inorganic salt anti-corrosion coating include inorganic phosphate aluminum coating. The inorganic salt anti-corrosion coating comprises an inorganic salt anti-corrosion base layer and an inorganic salt anti-corrosion surface layer, and the components of the inorganic salt anti-corrosion base layer include phosphate, aluminum powder and organosilicon; a large amount of aluminum is added to the inorganic salt anti-corrosion base layer, which not only enhances the bonding force between the anti-corrosion stratum and the surface of the parts, but also improves the corrosion resistance of the anti-corrosion base layer. The components of the inorganic salt anti-corrosion surface layer include phosphate, organosilicon, inorganic silicon and iron-titanium oxide.

[0062] The phosphate in the inorganic salt anticorrosion bottom layer and the inorganic salt anticorrosion surface layer is selected from one or more of aluminum phosphate, potassium phosphate or sodium phosphate; the organic silicon in the inorganic salt anticorrosion bottom layer and the inorganic salt anticorrosion surface layer is methylphenyl silicon; the methylphenyl silicon is selected from one or more of methylphenyl silane, methylphenyl silicone resin and methylphenyl silicone rubber. The inorganic silicon is silicon dioxide or silicate. The silicate is selected from one of sodium silicate, potassium silicate or aluminum silicate.

[0063] The mass ratio of phosphate, aluminum powder and organic silicon in the inorganic salt anticorrosive base layer is 3-7:2-6:1, preferably, 40% phosphate, 50% aluminum powder and 10% organic silicon.

[0064] The mass ratio of phosphate, organosilicon, inorganic silicon and iron-titanium oxide in the inorganic salt anticorrosive surface layer is 7-11:4-8:1-3:2-5, preferably, 45% phosphate, 30% organosilicon, 10% inorganic silicon and 15% iron-titanium oxide.

[0065] The present invention provides a method for preparing an anti-corrosion coating for turboshaft engine parts for marine environments, the method comprising: performing a first pretreatment on the surface of the turboshaft engine parts for marine environments; spraying an inorganic salt anti-corrosion base layer on the surface of the turboshaft engine parts for marine environments after the first pretreatment; and sequentially performing a second pretreatment and spraying an inorganic salt anti-corrosion surface layer on the surface of the turboshaft engine parts for marine environments after spraying the inorganic salt anti-corrosion base layer.

[0066] In a specific embodiment of the present invention, Figure 1 As shown, the first pretreatment is performed on the surface of the turboshaft engine parts for the marine environment, including: degreasing, drying and sand blowing performed in sequence, wherein the oil and stains on the surface of the turboshaft engine parts for the marine environment are removed. In an embodiment of the present invention, the cleaning agent for removing the oil and stains can be gasoline, etc., and the cleaning is performed no less than twice; the surface of the turboshaft engine parts for the marine environment after the oil and stains are removed is dried at 40-60°C for more than 0.5 hour; and the surface of the turboshaft engine parts for the marine environment after drying is sand blown.

[0067] In a specific embodiment of the present invention, a sandblasting gun is used to spray tiny particles at high speed onto the surface of a part. On the one hand, it can remove floating rust on the surface of the part, and on the other hand, it can form an uneven granular texture on the surface of the part, thereby enhancing the bonding strength between the part substrate and the machine salt anti-corrosion bottom layer.

[0068] In a specific embodiment of the present invention, the step of spraying the inorganic salt anticorrosive base layer comprises:

[0069] Mix the inorganic salt anti-corrosion coating evenly in a mixer; filter the mixed inorganic salt anti-corrosion coating with a 200-400 mesh screen to prevent the spray gun from being blocked;

[0070] Use a spray gun to spray the filtered inorganic salt anti-corrosion coating evenly on the surface of the turboshaft engine parts for marine environment after the first pretreatment for multiple times. After the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the first pretreatment, it is dried at 40-60℃ for 15-30 minutes before the next spraying. After spraying, the parts are placed in a sintering furnace or oven for high-temperature curing (heating (≤5℃ / min) to 80±10℃, keeping warm for 30min, and continuing to heat (≤5℃ / min) to 340±10℃ and keeping warm for 30min. During curing, the blower should be turned on to make the temperature in the sintering furnace (or oven) uniform.

[0071] In a specific embodiment of the present invention, Figure 2 As shown, the second pre-processing steps include:

[0072] After spraying the inorganic salt anti-corrosion primer, the surface of the turboshaft engine parts for marine environment is roughened, degreased and dried in sequence.

[0073] The surface of turboshaft engine parts for marine environment after spraying inorganic salt anti-corrosion primer is roughened by sandpaper grinding or shot peening; the surface of the inorganic salt anti-corrosion primer of the parts is formed with an uneven rough texture, and the inorganic salt anti-corrosion primer is ensured not to fall off, and the bonding force between the inorganic salt anti-corrosion primer and the inorganic salt anti-corrosion surface layer on the part substrate is enhanced; preferably, sandpaper with 100-150 mesh specifications or plastic shots are used for shot peening.

[0074] Remove oil and stains from the roughened surface of turboshaft engine parts for marine environments;

[0075] Dry the surface of turboshaft engine parts for marine environment after removing oil and stains at 40-60℃ for more than 0.5 hour.

[0076] In a specific embodiment of the present invention, the step of spraying the inorganic salt anticorrosive surface layer comprises:

[0077] Mix the inorganic salt anti-corrosion coating evenly in a mixer;

[0078] Use a screen to filter the mixed inorganic salt anti-corrosion coating;

[0079] The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of the turboshaft engine parts for marine environment after the second pretreatment using a spray gun.

[0080] After the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the second pretreatment, it is dried under predetermined conditions before the next spraying.

[0081] The anti-corrosion coating of turboshaft engine parts for marine environment is applied to the surface of the sealing ring of the engine for marine environment, wherein the inner sealing ring of the engine for marine environment is made of GH2909 material. For the sealing ring of the engine for marine environment (material GH2909), the corrosion-resistant inorganic coating can improve the corrosion resistance of the parts.

[0082] The technical solution of the present invention will be further described below in conjunction with specific implementation methods.

[0083] Example 1

[0084] like Figure 3a-3c As shown, for the GH 2909 sample, Figure 3a The original state of the GH 2909 sample (not subjected to salt corrosion and not sprayed with coating) has a silvery white metallic luster on the surface. Figure 3b This is the surface of the GH 2909 sample without spray coating and after salt corrosion for 100 hours. At this time, the surface color of the GH 2909 sample is dark brown, and corrosion has occurred; Figure 3c The GH 2909 sample is not sprayed with coating and is subjected to salt corrosion for 100 hours before alkali washing. The alkali washing is to remove the corrosion products on the surface and better observe the cross-sectional corrosion morphology of the metal substrate.

[0085] The cross-sectional microscopic morphology of the original GH 2909 specimen (not subjected to salt corrosion and not sprayed with coating) and the GH 2909 specimen without spraying with coating and subjected to salt corrosion for 100 hours were observed. Figure 4a and 4b As shown, the dark area represents the surface of the GH 2909 sample. Figure 4a The original state of the GH 2909 specimen in the middle GH 2909 specimen has a neat cross section and no corrosion; Figure 4b After 100 hours of salt corrosion on the uncoated GH 2909 specimen, corrosion pits can be clearly observed on the surface of the cross section, with the maximum depth of the corrosion pits being 4.7 μm.

[0086] After the GH 2909 sample was sprayed with an inorganic salt anticorrosion coating, the inorganic anticorrosion coating bottom layer contained 40% phosphate, 50% aluminum powder, and 10% organic silicon; the phosphate was aluminum phosphate, and the organic silicon was methylphenyl organic silicon resin; the inorganic salt anticorrosion surface layer contained 45% phosphate, 30% organic silicon, 10% inorganic silicon, and 15% iron titanium oxide (Fe2O5T i); the organic silicon was methylphenyl organic silicon resin, and the inorganic silicon was silicon dioxide. The thickness of the inorganic salt anticorrosion bottom layer and the inorganic salt anticorrosion surface layer were both 15-30 μm. It should be noted that the present application does not limit the size relationship between the thickness of the inorganic salt anticorrosion bottom layer and the inorganic salt anticorrosion surface layer.

[0087] like Figure 5a-5c As shown, Figure 5a This is the original state of the GH 2909 sample (not subjected to salt corrosion and sprayed with coating). The surface of the sample has a silvery white metallic luster. Figure 5b The surface of the GH 2909 sample after spraying the coating and then salt corrosion for 100 hours. At this time, the surface color of the GH 2909 sample changed from silver-white metallic luster to dark, and there was no obvious corrosion; Figure 5c The surface of the GH 2909 sample was sprayed with a coating and subjected to salt corrosion for 100 hours before being alkali washed. The alkali washing was to remove the corrosion products on the surface so as to observe the cross-sectional corrosion morphology of the metal substrate.

[0088] The cross-sectional microscopic morphology of the original GH 2909 specimen (not subjected to salt corrosion and not sprayed with coating) and the GH 2909 specimen without spraying with coating and subjected to salt corrosion for 100 hours were observed. Figure 6a and 6b As shown, the dark area represents the GH 2909 sample. Figure 6a The original state of the GH 2909 specimen in the middle GH 2909 specimen has a neat cross section and no corrosion; Figure 6b After the GH 2909 sample was sprayed with the coating and subjected to salt corrosion for 100 hours, no obvious corrosion pits were found on its cross section, indicating that the corrosion resistance of the GH 2909 sample was significantly improved after the anti-corrosion coating of the present invention was adopted.

[0089] Example 2

[0090] After spraying anti-corrosion coating on the surface of the inner sealing ring of a naval engine, no obvious signs of corrosion were found after being used in the marine environment for 740 hours.

[0091] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-corrosion coating for turboshaft engine parts for marine environments, characterized in that: The anti-corrosion coating is an inorganic salt anti-corrosion coating, wherein the inorganic salt anti-corrosion coating includes an inorganic salt anti-corrosion base layer and an inorganic salt anti-corrosion surface layer, the components of the inorganic salt anti-corrosion base layer include phosphate, aluminum powder and silicone; the components of the inorganic salt anti-corrosion surface layer include phosphate, silicone, inorganic silicon and iron-titanium oxide.

2. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 1, characterized in that: The phosphates in the inorganic salt anticorrosive bottom layer and the inorganic salt anticorrosive surface layer are selected from one or more of aluminum phosphate, potassium phosphate or sodium phosphate; The organic silicon in the inorganic salt anticorrosion base layer and the inorganic salt anticorrosion surface layer is methylphenyl silicon; The inorganic silicon is selected from silicon dioxide or silicate.

3. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 2, characterized in that: The methylphenylsilicone is selected from one or more of methylphenylsilane, methylphenylsilicone resin and methylphenylsilicone rubber; The silicate is selected from one of sodium silicate, potassium silicate or aluminum silicate.

4. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 1, characterized in that: The mass ratio of phosphate, aluminum powder and silicone in the inorganic salt anticorrosive base layer is 3-7:2-6:1; The mass ratio of phosphate, organic silicon, inorganic silicon and iron-titanium oxide in the inorganic salt anti-corrosion surface layer is 7-11:4-8:1-3:2-5.

5. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 1, characterized in that: The coating thickness of the inorganic salt anti-corrosion bottom layer and the inorganic salt anti-corrosion surface layer are both 15-30 μm.

6. A method for preparing an anti-corrosion coating for turboshaft engine parts for use in marine environments, characterized in that: The method comprises, Performing a first pretreatment on the surface of turboshaft engine parts for marine environments; Spraying an inorganic salt anti-corrosion base layer on the surface of the turboshaft engine parts for marine environment after the first pretreatment; The surface of turboshaft engine parts for marine environment after spraying inorganic salt anti-corrosion bottom layer is subjected to second pretreatment and spraying inorganic salt anti-corrosion surface layer in sequence, wherein: The main components of the inorganic salt anti-corrosion base layer and the inorganic anti-corrosion surface layer are inorganic aluminum phosphate coatings.

7. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 6, characterized in that: The first pretreatment of the surface of turboshaft engine parts for marine environment includes: Remove oil and stains from the surface of turboshaft engine parts used in marine environments; Dry the surface of turboshaft engine parts for marine environment after removing oil and stains at 40-60℃ for more than 0.5 hours; Sand blasting is performed on the surface of turboshaft engine parts for marine environments after drying.

8. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 6, characterized in that: The steps of spraying inorganic salt anticorrosive base layer include: Mix the inorganic salt anti-corrosion coating evenly in a mixer; Use a screen to filter the mixed inorganic salt anti-corrosion coating; The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of turboshaft engine parts for marine environment after the first pretreatment.

9. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 8, characterized in that: The sieve is a 200-400 mesh sieve.

10. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 8, characterized in that: The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of the turboshaft engine parts for marine environment after the first pretreatment using a spray gun, including: After the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the first pretreatment, it is dried under predetermined conditions before the next spraying.

11. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 10, characterized in that: The predetermined condition is: drying at 40-60° C. for 15-30 minutes.

12. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 6, characterized in that: The second pretreatment step comprises: After spraying the inorganic salt anti-corrosion primer, the surface of the turboshaft engine parts for marine environment is roughened, degreased and dried in sequence. The surface of turboshaft engine parts for marine environment is roughened by sandpaper grinding or shot peening after spraying with inorganic salt anti-corrosion primer; Remove oil and stains from the roughened surface of turboshaft engine parts for marine environments; After drying to remove oil and stains, dry the surface of turboshaft engine parts for marine environment at 40-60℃ for more than 0.5 hour.

13. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 6, characterized in that: The steps of spraying inorganic salt anticorrosive surface layer include: Mix the inorganic salt anti-corrosion coating evenly in a mixer; Use a screen to filter the mixed inorganic salt anti-corrosion coating; The filtered inorganic salt anti-corrosion coating is sprayed evenly multiple times on the surface of the turboshaft engine parts for marine environment after the second pretreatment.

14. The method for preparing the anti-corrosion coating of turboshaft engine parts for marine environment according to claim 13, characterized in that: After the filtered inorganic salt anti-corrosion coating is sprayed on the surface of the turboshaft engine parts for marine environment after the second pretreatment, it is dried under predetermined conditions before the next spraying.

15. The anti-corrosion coating for turboshaft engine parts for marine environment according to any one of claims 1 to 5 is applied to the surface of the sealing ring of the engine for marine environment, wherein: The engine sealing ring for marine environment is made of GH2909 material.

Images