CN113789521A - Spray rust removal liquid and spray rust removal method - Google Patents
Spray rust removal liquid and spray rust removal method Download PDFInfo
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- CN113789521A CN113789521A CN202111111344.6A CN202111111344A CN113789521A CN 113789521 A CN113789521 A CN 113789521A CN 202111111344 A CN202111111344 A CN 202111111344A CN 113789521 A CN113789521 A CN 113789521A
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- spray
- rust
- rust removal
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- hydroxide
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 239000007921 spray Substances 0.000 title claims abstract description 95
- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 125000001453 quaternary ammonium group Chemical group 0.000 claims abstract description 19
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims abstract description 19
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims abstract description 19
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 claims abstract description 18
- 239000000908 ammonium hydroxide Substances 0.000 claims abstract description 13
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000005507 spraying Methods 0.000 claims description 41
- 239000002245 particle Substances 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000007864 aqueous solution Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 14
- 238000005488 sandblasting Methods 0.000 claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 2
- 239000002223 garnet Substances 0.000 claims description 2
- 229910052863 mullite Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 229920006334 epoxy coating Polymers 0.000 description 11
- 238000000576 coating method Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000003973 paint Substances 0.000 description 6
- 238000005422 blasting Methods 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- -1 black oxide Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a spray rust removing liquid and a spray rust removing method. The effective component of the spray rust removal liquid is quaternary ammonium hydroxide, and the quaternary ammonium hydroxide is one or more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide. The invention has the advantages of environmental protection, no pollution, good rust removing effect, no rust on the surface of the steel after rust removal and the like, and is a novel green and pollution-free surface treatment technology.
Description
Technical Field
The invention belongs to the technical field of material surface treatment, and particularly relates to a rust removing composition and a rust removing method.
Background
Rust removal is required before the surface of steel is coated, so that the coated coating has good protection and adhesion. The spraying method is the most common rust removal method, has the characteristics of high rust removal speed, thorough rust layer removal, controllable anchor line depth and the like, and generally comprises methods of shot blasting, sand blasting, high-pressure water spraying and the like. The traditional dry sand blasting method is to blow out sand at a certain pressure and high speed by using high-pressure gas produced by an air compressor as power through a sand pipe, and to perform rust removal by using the beating and friction action of an abrasive. This operation blows out sand and simultaneously a large amount of dust blows out and the lime rust produces, and the dust is very big.
In the water-jet sand-blasting rust removal method which is popular in recent years, high-pressure water is used as power, abrasive materials are sucked by negative pressure formed when the high-pressure water is jetted at the high pressure of a water-jet gun head, and rust removal is carried out by utilizing the impact and friction action of the high-pressure water jet. The surface of the steel after being derusted by water has the phenomenon of rust return, and particularly in areas derusted by high-pressure water or areas with high air humidity, the rust return problem is more serious, so that the subsequent coating operation is difficult to carry out.
The rust inhibitor can inhibit the surface of steel products from rusting, and the components of the existing rust inhibitor contain paraffin wax and the like, for example, patent CN 105274536A-environment-friendly metal rust inhibitor, and the rust inhibitor needs to be cleaned and washed before metal coating; or contains phosphoric acid which is not environment-friendly enough, for example, patent CN110747475A discloses a rust inhibitor for manufacturing street lamp posts and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a spray rust removing liquid, which adopts a novel compound with passivation and isolation functions in spray rust removal, can prevent dust pollution in the rust removing process, can ensure that the surface of a steel product after rust removal does not generate rust removal within a certain time, can remove oil stains on the sprayed surface, and does not influence the adhesive force of a coating.
It is still another object of the present invention to provide a spray rust removing method.
The specific technical scheme for realizing the aim of the invention is as follows:
the effective component of the spray rust removing liquid is quaternary ammonium hydroxide, and the quaternary ammonium hydroxide is one or more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide.
The spray rust removing liquid is an aqueous solution, and the mass content of the quaternary ammonium base in the aqueous solution is 0.2-10%.
Further, the spray rust removing liquid is an aqueous solution, and the mass content of the quaternary ammonium base in the aqueous solution is 1-3%.
According to a preferable technical scheme, the quaternary ammonium hydroxide is equal mass combination of 2 of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide.
The spray rust removing method is characterized in that the spray rust removing liquid is independently sprayed or mixed with spray particles, and is sprayed to the surface of steel under the high pressure of 10-300 MPa to remove a rust layer on the surface of the steel.
The spray rust removing method belongs to a pretreatment part before the coating operation of the surface of steel. The method is to directly spray one or more of tetramethyl ammonium hydroxide solution, tetraethyl ammonium hydroxide solution, tetrapropyl ammonium hydroxide solution and tetrabutyl ammonium hydroxide solution (the concentration is 0.2-8 percent respectively) on the surface of the steel under high pressure to remove the rust layer on the surface of the steel, the spraying process is pollution-free, and the tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide and tetrabutyl ammonium hydroxide in the liquid film of the quaternary ammonium hydroxide solution prevent the rust on the surface of the steel. Meanwhile, because the tetramethyl ammonium hydroxide solution, the tetraethyl ammonium hydroxide solution, the tetrapropyl ammonium hydroxide solution and the tetrabutyl ammonium hydroxide solution have strong surface activity, the paint can remove oil stains on the surface of steel during spraying, and is beneficial to the adhesion of a coating.
The preferred embodiments of the present invention are as follows.
The spray rust removal method comprises the steps of independently spraying the spray rust removal liquid for rust removal, spraying the spray liquid to the surface of steel under the pressure of 30-270 MPa, and removing a rust layer on the surface of the steel;
collecting water used for spray rust removal in the spray process, and reusing after filtering.
Or the spray rust removal method comprises the steps of mixing the spray rust removal liquid with the spray particles, spraying the mixture to the surface of the steel at a high pressure of 10-100 MPa after mixing the spray liquid with the spray particles, and removing a rust layer on the surface of the steel; the volume ratio of the spray particles to the aqueous solution is (1-4): (9-6), preferably (2-3): (8-7);
collecting water used for spray rust removal in the spray process, and reusing after filtering.
The method is economical, and the metal surface after rust removal is in an original state without anchor lines caused by spraying. The added spray particles have anchor lines after spraying, which is beneficial to the subsequent paint spraying process. If the addition amount of the spray particles in the aqueous solution is too much, equipment is damaged, and further considering the requirement of coating on the anchor lines, the volume ratio is preferably (2-3): (8-7).
And then or, the spray rust removal method comprises the steps of mixing the spray rust removal liquid with the spray particles, mixing the spray particles and the spray rust removal liquid into wet sand according to the mass ratio of 10-20: 1, and spraying the wet sand by using dry sand blasting rust removal sand blasting equipment.
The wet sand is used for removing rust, does not generate dust and is environment-friendly; but this method cannot recover water.
Preferably, the quaternary ammonium hydroxide and water are prepared into a 3% solution, and the aqueous solution is directly sprayed on the surface of steel at high pressure to remove rust, wherein the spraying pressure is 70-250 MPa; or adding spray particles into the aqueous solution, and spraying the mixture onto the surface of the steel by using high-pressure water spraying rust removal equipment, wherein the spraying pressure is 40-100 MPa.
Wherein the diameter of the jet particles is 0.1-2mm, and the jet particles are selected from one or more of quartz sand, silicon carbide particles, mullite sand, carborundum, shell powder and garnet.
The method comprises wetting blasting particles (such as quartz sand) for blasting with one or more of tetramethylammonium hydroxide solution, tetraethylammonium hydroxide solution, tetrapropylammonium hydroxide solution and tetrabutylammonium hydroxide solution (0.2-10% concentration), and then blasting the steel surface with the wet blasting particles. Because the surface of the spray particle is provided with a layer of quaternary ammonium base solution liquid film, the wet spray particle can not generate raise dust to be diffused in the air during spraying, so that the pollution is avoided in the rust removing process. Meanwhile, when the sprayed material particles contact the surface of the steel during spraying, a liquid film on the particle surface can be retained and attached to the surface of the steel to form a quaternary ammonium hydroxide solution film layer, and the quaternary ammonium hydroxide in the liquid film has the functions of rust prevention and corrosion inhibition, so that the surface of the steel is protected from rusting.
The invention has the advantages of environmental protection, no pollution, good rust removing effect, no rust on the surface of the steel after rust removal and the like, and is a novel green and pollution-free surface treatment technology.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention.
The following examples are given to further illustrate the embodiments of the present invention. Unless otherwise specified, all technical means used in the examples are technical means existing in the field.
Example 1
Preparing 2% solution of tetramethylammonium hydroxide and water, and spraying by using high-pressure water spraying rust removal equipment, wherein the aperture of a spraying hole is 1-4mm, and the distance between a nozzle and the surface is 5-25 cm. The solution is sprayed on the surface of steel under 150MPa (no other surface treatment is carried out after flushing), the rust removal grade can reach Sa2.5 grade, and the surface of steel after rust removal can be maintained in the atmosphere with the relative humidity of 85% for 72 hours without rust.
Collecting water used for spray rust removal in the spray process, and reusing after filtering.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 6 MPa.
The rust removing operation has no dust and is environment-friendly.
The same spray rust removing liquid is adopted, and the spray pressure is set to be 20, 50, 70, 100, 130, 170, 200, 230 and 250 MPa. When the pressure is 200MPa or more, an ultra high pressure pump (UHP pump) is used.
Comparing the operation at different injection pressures, it was found that the oxide scale could not be removed at injection pressures below 30 Mpa. When the pressure is lower than 70MPa, loose rust layers, chips and residual coatings on the surface of steel can be removed, but the removal of black iron oxide Fe is difficult3O4Rust layer, no matt surface can be obtained. At pressures up to 70Mpa, a uniform matt surface is obtained, which is capable of removing black oxides, but at too low a speed. As the pressure increases, the rate of removal also increases.
When the injection pressure is 130-170 Mpa, a uniform matt surface is obtained. Can remove elastomer coatings, black oxides, paints, etc.; most chemical contaminants can be removed. A uniform matt surface is obtained at pressures of 230 to 250 Mpa. Various surface impurities including oxide scales can be rapidly removed. Higher injection pressures are therefore no longer tested.
Comparative example:
no quaternary ammonium base is added into water, and high pressure water spraying rust eliminating equipment is adopted for spraying, wherein the spraying conditions are the same as those of the example 1. Spraying water onto the surface of the steel at 230MPa (no other surface treatment is carried out after flushing), the derusting grade can reach Sa2.5 grade, and the rust phenomenon can be observed by naked eyes when the surface of the steel after derusting is 30 min.
Example 2
Tetraethyl ammonium hydroxide and water are prepared into 1 percent solution, the solution is sprayed on the surface of the steel by high-pressure water spraying rust removal equipment under the high pressure of 230MPa, the rust removal grade can reach Sa2.5 grade, and the surface of the steel after rust removal is kept in the atmosphere with the relative humidity of 85 percent for 12 hours without rusting.
Collecting water used for spray rust removal in the spray process, and reusing after filtering.
The surface is dried and then coated with an epoxy coating (the epoxy coating produced in the Tianyuan chemical industry of Xian, the patent application number is CN201810119938.3. the same epoxy coating is used in the later embodiment), and the adhesive force can reach more than 7 MPa.
Example 3
Tetraethyl ammonium hydroxide and water are prepared into 2 percent solution, the solution is sprayed on the surface of the steel by high-pressure water spraying rust removal equipment under the high pressure of 230MPa, the rust removal grade can reach Sa2.5 grade, and the surface of the steel after rust removal is kept in the atmosphere with the relative humidity of 85 percent for 72 hours without rusting.
Collecting water used for spray rust removal in the spray process, and reusing after filtering.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 6 MPa.
Example 4
The tetrapropylammonium hydroxide and water are prepared into 2 percent solution, the solution is sprayed on the surface of the steel by high-pressure water spraying rust removal equipment under the high pressure of 230MPa, the rust removal grade can reach Sa2.5 grade, and the surface of the steel after rust removal is kept in the atmosphere with the relative humidity of 85 percent for 48 hours without rusting.
Collecting water used for spray rust removal in the spray process, and reusing after filtering.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 5 MPa.
Example 5
The embodiment adopts pressure type sand blasting for rust removal.
Tetraethyl ammonium hydroxide and water are prepared into 3 percent solution, silicon carbide particles with the diameter of about 0.1-2mm are added into the water solution, the volume ratio of the added particles is 2 and 8, the mixture is sprayed on the surface of steel by high-pressure water spraying rust removal equipment under the high pressure of 10MPa, the aperture of a spraying hole is 8mm, and the distance between the spraying hole and the surface is 5-25 cm. The rust removing grade can reach Sa2.5 grade, the depth of the anchor lines is 30-70 microns, and the surface of the steel after rust removing can be kept in the atmosphere with the relative humidity of 85% for 168 hours without rusting.
Collecting water used for spray rust removal in the spray process, and reusing after filtering. After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 8 MPa.
The same mixture of the spray rust removing liquid and the silicon carbide particles is adopted, and the spray pressure is set to be 30, 50, 70, 100 and 130 MPa.
Comparing different injection pressures, the injection pressure higher than 10MPa can remove the oxide skin to a certain extent. At 30MPa, black oxide can be removed, but the speed is slow; as the pressure increases, the rate of removal also increases. And when the pressure is 50-70 Mpa, the elastomer coating, black oxide, paint and the like can be removed, most chemical pollutants can be removed, and a uniform matt surface is obtained. At pressures of 70 to 130Mpa, a uniform matt surface is obtained, which strongly removes surface impurities including most of the oxide scale. However, the large injection pressure causes difficulty in operation (the injection pressure causes recoil, and the operator is likely to be fatigued because of tightening the body). And the subsequent embodiment of mixing the derusting liquid and the sand is selected to operate under the injection pressure of 50-100 Mpa.
Example 6
The embodiment adopts pressure type sand blasting for rust removal.
Tetraethyl ammonium hydroxide and water are prepared into a 3% solution, quartz sand or silicon carbide particles with the diameter of about 0.1-2mm are added into the aqueous solution, the volume ratio of the added particles is spray particles 2 and the aqueous solution 8, the mixture is sprayed on the surface of steel by high-pressure water spraying rust removal equipment under the high pressure of 50MPa, the rust removal grade can reach Sa2.5 grade, the depth of an anchor line is 30-70 microns, and the surface of the steel after rust removal can be kept free from rust for 168 hours in the atmosphere with the relative humidity of 85%.
Collecting water used for spray rust removal in the spray process, and reusing after filtering.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 8 MPa.
Example 7
The embodiment adopts suction type sand blasting for rust removal.
Tetraethyl ammonium hydroxide and water are prepared into 3 percent solution, and the solution is sprayed by high-pressure water rust removal equipment under the high pressure of 100MPa, the high-pressure water rust removal equipment is connected with sand blasting equipment, and silicon carbide particles with the diameter of about 0.1-2mm are sprayed while the spraying rust removal liquid is sprayed.
Wherein the pressure of the compressed air for sand blasting is 0.4-0.6 MPa.
The mixture is sprayed on the surface of steel, the derusting grade can reach Sa2.5 grade, the depth of the anchor lines is 20 microns, and the surface of the steel after derusting can be maintained in the atmosphere with the relative humidity of 85 percent for 168 hours without rusting.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 8 MPa.
Example 8
The tetramethyl ammonium hydroxide, the tetraethyl ammonium hydroxide and water are prepared into a 2% solution (the weight ratio of the tetramethyl ammonium hydroxide to the tetraethyl ammonium hydroxide is 1: 1), the solution is sprayed on the surface of steel by high-pressure water spraying rust removal equipment under the high pressure of 200MPa, the rust removal grade can reach Sa2.5, and the surface of the steel after rust removal can be kept for 72 hours without rusting in the atmosphere with the relative humidity of 85%.
After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 6 MPa.
Example 9
Tetraethyl ammonium hydroxide and water are prepared into 0.5 percent solution, the solution is sprayed on the surface of the steel by high-pressure water spraying rust removal equipment, the rust removal grade can reach Sa2.5 grade, and the surface of the steel after rust removal can be kept for 3 hours in the atmosphere with the relative humidity of 85 percent without rusting. After the surface is dried, the epoxy coating is coated, and the adhesive force can reach more than 7 MPa.
Example 10
Tetraethyl ammonium hydroxide and water are prepared into 4 percent solution, the solution is sprayed on the surface of the steel by high-pressure water spraying rust removal equipment under the high pressure of 200MPa, the rust removal grade can reach Sa2.5 grade, and the surface of the steel after rust removal can be kept for 168 hours in the atmosphere with the relative humidity of 85 percent without rusting.
After the surface is dried, the epoxy paint is coated, the adhesive force is poor, and the epoxy paint is not easy to coat.
Example 11
The method comprises the steps of preparing 3% of spray rust removing liquid from tetraethyl ammonium hydroxide and water, mixing the spray rust removing liquid with spray particles, mixing the spray particles with the spray rust removing liquid according to a mass ratio of 10-20: 1 to form wet sand, and spraying the wet sand by using dry sand blasting, rust removing and sand blasting equipment.
The method uses wet sand to remove rust, has no dust emission and is environment-friendly. The operation may be performed indoors.
Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and alterations can be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The spray rust removal liquid is characterized in that the effective component of the spray rust removal liquid is quaternary ammonium hydroxide, and the quaternary ammonium hydroxide is one or more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide.
2. The spray rust removing liquid as claimed in claim 1, wherein the spray rust removing liquid is an aqueous solution, and the mass content of the quaternary ammonium base in the aqueous solution is 0.2-10%.
3. The spray rust removing liquid as claimed in claim 2, wherein the spray rust removing liquid is an aqueous solution, and the mass content of the quaternary ammonium base in the aqueous solution is 1-3%.
4. The spray rust removing liquid as claimed in any one of claims 1 to 3, wherein the quaternary ammonium hydroxide is an equal mass combination of 2 of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide.
5. A spray rust removal method is characterized in that the spray rust removal liquid of any one of claims 1 to 4 is independently sprayed or mixed with spray particles, and is sprayed to the surface of a steel material under the high pressure of 10 to 300MPa to remove a rust layer on the surface of the steel material.
6. The spray rust removal method as claimed in claim 5, wherein the spray rust removal liquid is used for independently spraying rust removal, and the spray liquid is sprayed to the surface of the steel material under the pressure of 30-270 MPa to remove a rust layer on the surface of the steel material;
collecting water used for spray rust removal in the spray process, and reusing after filtering.
7. The spray rust removing method according to claim 5, wherein the spray rust removing liquid is mixed with the spray particles, and after the spray liquid and the spray particles are mixed, the mixture is sprayed onto the surface of the steel material under the high pressure of 10-100 MPa to remove a rust layer on the surface of the steel material; the volume ratio of the spray particles to the aqueous solution is (1-4): (9-6), preferably (2-3): (8-7);
collecting water used for spray rust removal in the spray process, and reusing after filtering.
8. The spray rust removal method as claimed in claim 5, characterized in that the spray rust removal liquid is mixed with spray particles, the spray particles and the spray rust removal liquid are mixed into wet sand according to the mass ratio of 10-20: 1, and the wet sand is sprayed by using dry sand blasting rust removal sand blasting equipment.
9. The spray rust removal method as claimed in claim 5, characterized in that the quaternary ammonium hydroxide and water are prepared into a 3% solution, and the aqueous solution is directly sprayed on the surface of steel at high pressure to remove rust, wherein the spraying pressure is 70-250 MPa; or adding spray particles into the aqueous solution, and spraying the mixture onto the surface of the steel by using high-pressure water spraying rust removal equipment, wherein the spraying pressure is 40-100 MPa.
10. The spray rust removal method according to any one of claims 5 to 9, wherein the spray particles have a diameter of 0.1 to 2mm and are selected from one or more of quartz sand, silicon carbide particles, mullite sand, silicon carbide, shell powder and garnet.
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| CN202111111344.6A CN113789521A (en) | 2021-09-23 | 2021-09-23 | Spray rust removal liquid and spray rust removal method |
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