CN115283309B - Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method - Google Patents
Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method Download PDFInfo
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- CN115283309B CN115283309B CN202210790810.6A CN202210790810A CN115283309B CN 115283309 B CN115283309 B CN 115283309B CN 202210790810 A CN202210790810 A CN 202210790810A CN 115283309 B CN115283309 B CN 115283309B
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- 239000003973 paint Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000126 substance Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 238000010926 purge Methods 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 238000005238 degreasing Methods 0.000 claims abstract description 9
- 238000002161 passivation Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 6
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 6
- 239000001488 sodium phosphate Substances 0.000 claims description 6
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 6
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 238000007654 immersion Methods 0.000 abstract 1
- 239000003082 abrasive agent Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Classifications
-
- B08B1/30—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
Abstract
The invention aims to provide a method for removing residual dirt and paint layers on the surface of a gas turbine casing by a chemical method, which comprises the following steps: mounting, chemical degreasing, cleaning with non-flowing hot water, removing residual dirt and paint layers, cleaning with flowing hot water, cleaning with flowing cold water, purging, gloss treatment, cleaning with flowing cold water, removing copper on contact surfaces, cleaning with flowing cold water, purging, drying, wiping, passivation treatment and oil immersion. The invention can comprehensively remove residual dirt and paint layers on the surface of the casing without dead angles, and can protect the assembly size of the casing, thereby meeting the assembly requirement after repair, avoiding mechanical damage to the casing and prolonging the service life of the casing.
Description
Technical Field
The invention relates to a surface treatment method of a gas turbine, in particular to a surface treatment method of a casing of the gas turbine.
Background
The casing is the main bearing part of the gas turbine and is also the main component of the gas turbine air flow passage. The quality of the casing is directly related to the performance, life and reliability of the engine. After the engine gas turbine reaches the overhaul period, as the engine case works in a high-temperature high-pressure corrosion-prone environment for a long time, a large area of residual dirt and paint layers are often attached to the outer surface of the engine case when the engine case is subjected to factory returning repair. Residual dirt and paint layers on the surface of the casing are removed, so that the service life of the casing can be effectively prolonged.
In the field of gas turbines, common methods for removing residual scales of a casing include sand blasting, manual scale removal, rolling and polishing scale removal and the like. Sand blasting and descaling: the high-pressure fluid is used as power to directly spray the abrasive material on the surface of the part, and the mechanical impact scouring action of the abrasive material is utilized to remove the residual dirt and paint layer on the surface of the casing. Because the casing is normally provided with more holes, the method cannot completely remove residual dirt on the surface of the casing. To remove the residual scale comprehensively, multiple manual scale removal is often required. Manual descaling: the method is easy to damage the casing and destroy the main size of the casing manually. Rolling and descaling: placing the casing, the grinding material and the descaling liquid into a roller together, and rotating the roller to remove residual scale on the surface of the part. The method cannot completely remove the residual scale on the surface of the casing, and the casing with a smaller size cannot remove the residual scale by the method due to the size of the roller.
Disclosure of Invention
The invention aims to provide a method for removing residual scale and paint layers on the surface of a gas turbine casing by a chemical method, which can effectively remove the residual scale and paint layers on the surface of the gas turbine casing, prolong the service life of the casing and simultaneously avoid the problems of mechanical damage and the like caused by the conventional method.
The purpose of the invention is realized in the following way:
the invention relates to a method for removing residual dirt and paint layers on the surface of a gas turbine casing by a chemical method, which is characterized by comprising the following steps of:
(1) And (2) mounting: when the case needing to be cleaned of residual dirt and paint layers is arranged on a steel hook, a chain or a special fixture, the case is ensured not to form an air pocket when immersed in the solution, and the solution is ensured to contact all surfaces to be processed of the case;
(2) Chemical degreasing: chemically degreasing with a solution containing sodium phosphate;
(3) Washing with no-flow hot water: immersing the casing in a non-flowing hot water tank for 3-5 times for cleaning;
(4) Removing residual dirt and paint layers: removing residual dirt and paint layers by using a solution containing sodium hydroxide;
(5) Washing with flowing hot water: immersing the casing in a flowing hot water tank for 3-5 times to clean;
(6) Washing with flowing cold water: immersing the casing in a flowing cold water tank for 3-5 times to clean, wherein the rotation rate of the water tank capacity per hour is 1;
(7) And (3) purging: purging with a water-gas spray gun to remove loose residual dirt;
(8) And (3) gloss treatment: carrying out gloss treatment in a tank containing hydrochloric acid solution;
(9) Washing with flowing cold water: the same as in step (6);
(10) Copper on the contact surface is removed: removing copper on the contact surface with a solution containing chromate and sulfuric acid;
(11) Washing with flowing cold water: the same as in step (6);
(12) And (3) purging: the same as in step (7);
(13) And (3) drying: purging the surface of the case with dehumidified and deoiled dry compressed air for 10-30 minutes;
(14) Wiping: wiping with wiping cloth or cotton rag, dehumidifying and removing attachments;
(15) And (3) passivation treatment: passivating in a tank containing phosphoric acid solution;
(16) Soaking oil: the casing without coating is immersed in the oil seal oil after the residual scale is removed.
The invention may further include:
1. the concentration of the sodium phosphate solution used for the chemical degreasing in the step (2) is 30-50 g/L, the treatment temperature is 60-80 ℃, and the treatment time is 10-20 minutes.
2. The concentration of the sodium hydroxide solution used for removing the residual dirt and the paint layer in the step (4) is 250-300 g/L, the treatment temperature is 70-100 ℃, and the treatment time is 2-4 hours.
3. The concentration of the hydrochloric acid solution used in the step (8) of the luster treatment is 50-100 g/L, and the treatment time is 5-30 hours.
4. The concentration of chromate in the solution used for removing copper on the contact surface in the step (10) is 140-150 g/L, the concentration of sulfuric acid is 2-14 g/L, and the treatment time is 30-60 seconds.
5. The concentration of phosphoric acid in the solution used in the passivation treatment in the step (15) is 100-120 g/L, and the treatment time is 3-6 minutes.
The invention has the advantages that:
1. can comprehensively remove residual dirt and paint layers on the surface of the casing without dead angles.
2. The assembly size of the casing can be protected, so that the assembly requirement after repair is met.
3. Mechanical damage to the casing can be avoided, so that the service life of the casing is prolonged.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in more detail below, by way of example, with reference to the accompanying drawings:
referring to fig. 1, the present invention specifically includes the following steps:
s1, mounting: when the casing which needs to be cleaned of residual dirt and paint layers is mounted on a steel hook, a chain or a special fixture, the casing should be ensured not to form an air pocket when being immersed in the solution, and the solution can be ensured to normally contact all surfaces to be processed.
S2, chemical degreasing: chemical degreasing is performed with a solution containing sodium phosphate. The concentration of the sodium phosphate solution used should be (30-50) g/L, the treatment temperature should be (60-80) deg.C, and the treatment time should be (10-20) minutes.
S3, cleaning with non-flowing hot water: immersing the casing in a non-flowing hot water tank for 3-5 times to clean, wherein the water temperature for cleaning is (60-90 ℃).
S4, removing residual dirt and a paint layer: the residual scale and paint layer are removed with a solution containing sodium hydroxide. The concentration of the sodium hydroxide solution used should be (250-300) g/l, the treatment temperature should be (70-100) deg.c, and the treatment time should be (2-4) hours.
S5, cleaning by flowing hot water, and immersing the casing in the flowing hot water tank for 3-5 times for cleaning.
Preferably, when the water is washed with flowing hot water, the water temperature is selected to be (60-90 ℃) and the rotation rate of the water tank capacity per hour is 0.5.
S6, cleaning with flowing cold water: the casing was immersed in a flowing hot water tank for 3 to 5 times to perform cleaning, and the rotation rate of the tank capacity per hour was 1.
S7, purging: purging with a water-gas spray gun to remove loose residual scale.
S8, gloss treatment: the gloss treatment was carried out in a tank containing hydrochloric acid solution. The concentration of the hydrochloric acid solution used should be (50-100) g/l and the treatment time should be (5-30) hours.
S9, cleaning with flowing cold water: the method is the same as S6.
S10, removing copper on the contact surface: copper on the contact surface was removed with a solution containing chromate and sulfuric acid. The concentration of chromate in the used solution should be (140-150) g/l, the concentration of sulfuric acid should be (2-14) g/l, and the treatment time should be (30-60) seconds.
S11, cleaning with flowing cold water: s6, the method is the same as that of S6;
s12, purging: s7, the method is the same as that of S7;
s13, drying: purging (10-30) the surface of the case with dehumidified and deoiled dry compressed air for a period of 10-30 minutes;
s14, wiping: wiping with a wiping cloth or a cotton rag to dehumidify and remove the attachments better;
s15, passivation treatment: passivating in a tank containing phosphoric acid solution; the concentration of phosphoric acid in the solution used should be (100-120) g/l and the treatment time should be (3-6) minutes.
S16, soaking oil: the cartridge receiver without the paint coating after the residual scale is removed needs to be immersed in a high content of 66VCI oil seal oil to prevent 2 times of oxidation.
Claims (1)
1. A method for removing residual dirt and paint layer on the surface of a gas turbine casing by using a chemical method is characterized by comprising the following steps:
(1) And (2) mounting: when the case needing to be cleaned of residual dirt and paint layers is arranged on a steel hook and a chain, the case is ensured not to form an air pocket when immersed in the solution, and the solution is ensured to be in contact with all surfaces to be processed of the case;
(2) Chemical degreasing: chemically degreasing with a solution containing sodium phosphate;
(3) Washing with no-flow hot water: immersing the casing in a non-flowing hot water tank for 3-5 times for cleaning;
(4) Removing residual dirt and paint layers: removing residual dirt and paint layers by using a solution containing sodium hydroxide;
(5) Washing with flowing hot water: immersing the casing in a flowing hot water tank for 3-5 times to clean;
(6) Washing with flowing cold water: immersing the casing in a flowing cold water tank for 3-5 times to clean, wherein the rotation rate of the water tank capacity per hour is 1;
(7) And (3) purging: purging with a water-gas spray gun to remove loose residual dirt;
(8) And (3) gloss treatment: carrying out gloss treatment in a tank containing hydrochloric acid solution;
(9) Washing with flowing cold water: the same as in step (6);
(10) Copper on the contact surface is removed: removing copper on the contact surface with a solution containing chromate and sulfuric acid;
(11) Washing with flowing cold water: the same as in step (6);
(12) And (3) purging: the same as in step (7);
(13) And (3) drying: purging the surface of the case with dehumidified and deoiled dry compressed air for 10-30 minutes;
(14) Wiping: wiping with wiping cloth or cotton rag, dehumidifying and removing attachments;
(15) And (3) passivation treatment: passivating in a tank containing phosphoric acid solution;
(16) Soaking oil: after removing residual scale, the casing which is not coated with the coating needs to be immersed in oil sealing oil;
the concentration of the sodium phosphate solution used in the chemical degreasing in the step (2) is 30-50 g/L, the treatment temperature is 60-80 ℃, and the treatment time is 10-20 minutes; the concentration of the sodium hydroxide solution used for removing the residual scale and the paint layer in the step (4) is 250-300 g/L, the treatment temperature is 70-100 ℃, and the treatment time is 2-4 hours; the concentration of the hydrochloric acid solution used in the luster treatment in the step (8) is 50-100 g/L, and the treatment time is 5-30 hours; the concentration of chromate in the solution used for removing copper on the contact surface in the step (10) is 140-150 g/L, the concentration of sulfuric acid is 2-14 g/L, and the treatment time is 30-60 seconds; the concentration of phosphoric acid in the solution used in the passivation treatment in the step (15) is 100-120 g/L, and the treatment time is 3-6 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210790810.6A CN115283309B (en) | 2022-07-06 | 2022-07-06 | Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210790810.6A CN115283309B (en) | 2022-07-06 | 2022-07-06 | Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115283309A CN115283309A (en) | 2022-11-04 |
| CN115283309B true CN115283309B (en) | 2024-04-02 |
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| CN202210790810.6A Active CN115283309B (en) | 2022-07-06 | 2022-07-06 | Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method |
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| Publication number | Publication date |
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| CN115283309A (en) | 2022-11-04 |
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