CN116288384A - Pickling solution for removing ash on surface of aluminum-based silicon carbide composite material - Google Patents
Pickling solution for removing ash on surface of aluminum-based silicon carbide composite material Download PDFInfo
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- CN116288384A CN116288384A CN202310015858.4A CN202310015858A CN116288384A CN 116288384 A CN116288384 A CN 116288384A CN 202310015858 A CN202310015858 A CN 202310015858A CN 116288384 A CN116288384 A CN 116288384A
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- aluminum
- silicon carbide
- composite material
- pickling solution
- based silicon
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- 239000002131 composite material Substances 0.000 title claims abstract description 77
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 57
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 57
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 57
- 238000005554 pickling Methods 0.000 title claims abstract description 42
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 50
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 15
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims abstract description 11
- 239000003112 inhibitor Substances 0.000 claims abstract description 11
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 150000007524 organic acids Chemical class 0.000 claims abstract description 10
- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 36
- 239000004115 Sodium Silicate Substances 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 15
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 13
- 239000004202 carbamide Substances 0.000 claims description 13
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 13
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 13
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 13
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 12
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 12
- 239000004327 boric acid Substances 0.000 claims description 12
- 239000000176 sodium gluconate Substances 0.000 claims description 12
- 235000012207 sodium gluconate Nutrition 0.000 claims description 12
- 229940005574 sodium gluconate Drugs 0.000 claims description 12
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 claims description 11
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 239000003945 anionic surfactant Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002736 nonionic surfactant Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 21
- 239000012028 Fenton's reagent Substances 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001447 ferric ion Inorganic materials 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 12
- 239000002351 wastewater Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 238000002791 soaking Methods 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000010815 organic waste Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000004383 yellowing 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
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of surface treatment, and particularly relates to a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, wherein the pickling solution takes water as a solvent and comprises the following components in terms of concentration: 150g/L to 250g/L of ammonium fluoride; 40g/L to 100g/L of oxidant hydrogen peroxide; 80g/L to 150g/L of organic acid builder; the pH stabilizer is 100g/L to 160g/L; 20g/L to 60g/L of organic-inorganic composite corrosion inhibitor; 5g/L to 20g/L of composite surfactant; 5g/L to 15g/L of anhydrous magnesium sulfate. The invention provides a pollution-free pickling solution for removing 'ash hanging', and more importantly, even the waste solution with lost pickling effect can be continuously used as a preparation solution of 'Fenton reagent', and the waste solution containing ferric ions with higher concentration and waste iron slag are mixed as an effective method for reducing COD of discharged sewage. The chemical reagent is utilized maximally in the process, the emission of pollutants is reduced, not only effectively reduces the cost, but also has the advantages of environmental protection, no pollution and multiple purposes.
Description
Technical Field
The invention belongs to the technical field of surface treatment, and particularly relates to an acid washing liquid for removing ash hanging on the surface of an aluminum-based silicon carbide composite material.
Background
The aluminum-based silicon carbide composite material has the advantages of high strength, high hardness, low thermal expansion coefficient and the like, is often used as an optical structural member of aerospace products, satellite cameras, high-end cameras and the like, and the structural member is required to be blackened on the surface and has absorptivity not lower than 90 percent due to special application, so that the strict requirement is definitely very strict for the pretreatment of blacking.
Because the silicon content of the material is often higher, the surface ash is required to be removed through acid washing after oil removal and alkali washing, otherwise, the ash can influence the black plating effect, and the black film is fallen. In the prior art, nitric acid, chromic anhydride and other components with oxidizing property are often needed for acid washing to help remove 'hanging ash', but the substances are often extremely harmful to the environment. The nitrogen oxides generated by nitric acid and chromium ions generated by chromic anhydride are pollutants, and huge cost is needed for innocent treatment of the pollutants.
In view of the above, the invention aims to provide a pollution-free pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which can conveniently and effectively remove ash hanging only by soaking the aluminum-based silicon carbide composite material at room temperature, is convenient to operate, does not need extra equipment, does not generate toxic and harmful gas or other pollutants during soaking, can be used as a preparation solution of Fenton reagent and can be matched with other waste solutions to realize the degradation of high COD (chemical oxygen demand) waste water, and the surfactant used by the pickling solution can be completely degraded due to the existence of the Fenton reagent and can not be discharged into sewage, so that the pollution to the environment is reduced to the greatest extent, and the cost of enterprises is reduced.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the pollution-free pickling solution for removing ash hanging on the surface of the aluminum-based silicon carbide composite material is provided, when the pollution-free pickling solution is used, the ash hanging can be conveniently and effectively removed by soaking the aluminum-based silicon carbide composite material at room temperature, the operation is convenient, no extra equipment is needed, no toxic and harmful gas or other pollutants are produced during soaking, the waste liquid can be used as a preparation liquid of Fenton reagent, and the degradation of high COD (chemical oxygen demand) waste water is realized by matching with other waste liquids, the surfactant used by the pickling solution can be completely degraded due to the existence of Fenton reagent, and can not be discharged into sewage, so that the pollution to the environment is reduced to the greatest extent, and the cost of enterprises is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material takes water as a solvent, and comprises the following components in terms of concentration:
ammonium fluoride: 150g/L to 250g/L;
oxidizing agent hydrogen peroxide: 40g/L to 100g/L;
organic acid builder: 80g/L to 150g/L;
pH stabilizer: 100g/L to 160g/L;
organic-inorganic composite corrosion inhibitor: 20g/L to 60g/L;
composite surfactant: 5g/L to 20g/L;
anhydrous magnesium sulfate: 5g/L to 15g/L.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the pickling solution takes water as a solvent and comprises the following components in terms of concentration:
ammonium fluoride: 180g/L to 230g/L;
oxidizing agent hydrogen peroxide: 50g/L to 90g/L;
organic acid builder: 90g/L to 140g/L;
pH stabilizer: 110g/L to 150g/L;
organic-inorganic composite corrosion inhibitor: 30g/L to 50g/L;
composite surfactant: 8g/L to 18g/L;
anhydrous magnesium sulfate: 6g/L to 12g/L.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the pickling solution takes water as a solvent and comprises the following components in terms of concentration:
ammonium fluoride: 200g/L;
oxidizing agent hydrogen peroxide: 60g/L;
organic acid builder: 100g/L;
pH stabilizer: 130g/L;
organic-inorganic composite corrosion inhibitor: 40g/L;
composite surfactant: 10g/L;
anhydrous magnesium sulfate: 10g/L.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the mass concentration of the oxidant hydrogen peroxide is 30%.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the organic acid builder is citric acid.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the pH stabilizer is a mixture of sodium dihydrogen phosphate and boric acid, and the mass ratio of the sodium dihydrogen phosphate to the boric acid is (2-6): 1.
as an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the organic-inorganic composite corrosion inhibitor is a mixture of sodium gluconate, urea and sodium silicate, and the concentrations of the sodium gluconate, the urea and the sodium silicate are 5g/L-10g/L, 5g/L-30g/L and 10g/L-20g/L respectively.
As an improvement of the pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material, the composite surfactant is nonionic surfactant AEO-9 and anionic surfactant sodium dodecyl sulfate K 12 And the concentration of the nonionic surfactant AEO-9 is 5g/L to 10g/L, and the anionic surfactant sodium dodecyl sulfate K 12 The concentration of (C) is 5g/L-10g/L.
In the invention, from the chemical principle, the aluminum-based silicon carbide composite material has Si element segregation on the surface of the material after alkali etching, so that the solution has acidity and oxidability and contains fluorine element in order to remove the Si element on the surface of the material. Generally, silicon element is used as a very stable element, only chemical reaction occurs under alkaline condition or under the action of fluorine element, but the hanging ash contains a small part of metal oxides such as copper oxide, manganese oxide and the like besides the silicon element, and the metal oxides obviously cannot be dissolved under alkaline condition, so that the acid environment is provided to facilitate the removal of the hanging ash, the presence of the oxidizing substance is beneficial to the generation of an alumina oxide film, the alumina film damaged by the acid environment can be regenerated, and the surface of the aluminum-based silicon carbide composite material is kept uniform.
The main components of the invention include: ammonium fluoride, 30% hydrogen peroxide as oxidant, citric acid as organic acid builder, sodium dihydrogen phosphate and boric acid for stabilizing solution pH, organic-inorganic composite corrosion inhibitor (comprising sodium gluconate, urea and sodium silicate), composite surfactant (mainly comprising nonionic surfactant AEO-9 and anionic surfactant sodium dodecyl sulfate K) 12 ) And anhydrous magnesium sulfate, anhydrous magnesium sulfate and sodium silicate can serve as hydrogen peroxide stabilizers, namely, in the invention, sodium silicate can simultaneously play roles of corrosion inhibitors and hydrogen peroxide stabilizers. Generally, the stability of the hydrogen peroxide is poor, so that the solution is difficult to use for a long time, and the stability of the solution is greatly enhanced by adding a proper amount of hydrogen peroxide stabilizer, so that the effective acting area of the solution is effectively increased. In addition, the organic citric acid is used for replacing inorganic acid, so that metal cations in the solution can be effectively complexed, the stability of hydrogen peroxide is greatly improved, and the service life and the effective action time of the whole solution are improved. Practice shows that: after the pickling solution is placed for a week, the solution still has the capability of effectively removing ash hanging on the surface of the aluminum-based silicon carbide composite material, and the effective concentration of hydrogen peroxide is only reduced by less than 7 percent.
When in use, the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature and then is washed by flowing clean water. When the aluminum-based silicon carbide composite material is soaked too much, the phenomenon of slight yellowing (the trace ash hanging can be cleaned off under the condition of shaking in water) appears on the surface of the material, which indicates that the solution effect is seriously reduced, the solution can be collected, and the concentration of H ions of the solution can be tested, and according to the molar concentration of hydrogen ions and the molar concentration of ferric ions, the waste liquid is approximately expressed as 1:1:1, after reacting for a certain time, pouring the mixture into organic wastes such as high COD sewage, kitchen waste and the like to be treated, thereby greatly reducing the discharge of the organic wastes, reducing the pressure of the environment and realizing the double effects of environmental protection and economy.
In summary, the invention provides a pollution-free pickling solution to remove "ash hanging", and more importantly, even the waste solution with lost pickling effect can be continuously used as a preparation solution of Fenton reagent, and the waste solution containing high concentration of ferric ions and waste iron slag are mixed as an effective method for reducing COD of discharged sewage. The chemical reagent is utilized maximally in the process, the emission of pollutants is reduced, not only effectively reduces the cost, but also has the advantages of environmental protection, no pollution and multiple purposes. The hydrogen peroxide can generate hydroxyl radical under the catalysis of heavy metal ions such as Fe ions and copper ions under the acidic condition, so that the hydroxyl radical has extremely strong oxidizing property, and most organic matters can be decomposed into small-molecular carbon dioxide and water, thereby greatly reducing organic wastes in the wastewater. Generally, one of the most important monitoring indexes in wastewater is COD, because COD represents the content of oxygen-consuming organic matters in the wastewater, and the increase of COD in the wastewater inevitably leads to the eutrophication of microorganisms in the wastewater, so that the dissolved oxygen in the water is greatly consumed, and the serious decrease of the oxygen content in the water inevitably leads to the difficulty of normal survival of animals and plants in the water, so that strict control is required. The reduction of COD content of wastewater discharge as much as possible is the obligation of every socially responsible enterprise.
When the invention is used, the aluminum-based silicon carbide composite material is soaked at room temperature, so that ash hanging can be conveniently and effectively removed, the operation is convenient, no extra equipment is needed, no toxic and harmful gas or other pollutants are generated during soaking, the waste liquid can be used as a preparation liquid of Fenton reagent, and the waste liquid is matched with other waste liquids to realize the degradation of high COD (chemical oxygen demand) waste water.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
For an aluminum-based composite material with a silicon carbide content of 20%, the embodiment provides an acid washing liquid for washing hanging ash, which takes water as a solvent and comprises the following components in terms of concentration: 100g/L of citric acid, 200g/L of ammonium fluoride, 60g/L of 30% hydrogen peroxide, 100g/L of sodium dihydrogen phosphate, 15g/L of urea and 5g/L of AEO-9 12 The concentration ratio of sodium silicate to anhydrous magnesium sulfate is 1:1, and the concentration of anhydrous magnesium sulfate is 10g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope. The final effective soaking area was 10 square meters.
By contrast, the soaked aluminum-based silicon carbide composite material is compared with the traditional soaking result by a 30% nitric acid pickling scheme, 10 pieces of the soaked aluminum-based silicon carbide composite material are subjected to double-blind test, and the final coating effect is not obviously different, which shows that the method can completely replace the 30% nitric acid scheme, the pH value of the waste liquid obtained by the method is 1.3, the waste liquid is mixed with ferric trichloride etching waste liquid and waste stainless steel, and then the waste liquid is poured into the collected high-COD metal oil stain cleaning waste liquid, the COD of the waste liquid is finally reduced to 307mg/L from the original 623mg/L, the foam height is also half of the original one, the nano tube standard of a sewage station in a park is achieved, the cost is low, only about half of the waste liquid is delivered to a special environmental protection company, and the advocated green chemistry is realized to the greatest extent.
In summary, the present invention is both environmentally friendly and economical.
Example 2
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
120g/L of citric acid;
180g/L of ammonium fluoride;
80g/L of 30% hydrogen peroxide;
boric acid 30g/L;
110g/L sodium dihydrogen phosphate;
8g/L of sodium gluconate;
urea 15g/L;
AEO-98g/L；
K 12 8g/L；
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 8g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 3
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
90g/L of citric acid;
190g/L of ammonium fluoride;
30% hydrogen peroxide 70g/L;
boric acid 25g/L;
90g/L of sodium dihydrogen phosphate;
6g/L of sodium gluconate;
urea 12g/L;
AEO-96g/L；
K 12 6g/L；
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 7g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 4
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
110g/L of citric acid;
190g/L of ammonium fluoride;
30% hydrogen peroxide 90g/L;
boric acid 25g/L;
110g/L sodium dihydrogen phosphate;
7g/L of sodium gluconate;
urea 25g/L;
AEO-9 was at a concentration of 7g/L;
K 12 is 7g/L;
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 6.5g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 5
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
130g/L of citric acid;
175g/L of ammonium fluoride;
65g/L of 30% hydrogen peroxide;
boric acid 35g/L;
105g/L sodium dihydrogen phosphate;
8.5g/L of sodium gluconate;
urea 20g/L;
AEO-9 was at a concentration of 7.5g/L;
K 12 is 7.5g/L;
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 7.5g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 6
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
105g/L citric acid;
175g/L of ammonium fluoride;
30% hydrogen peroxide 85g/L;
boric acid 35g/L;
85g/L sodium dihydrogen phosphate;
9g/L of sodium gluconate;
urea 22g/L;
AEO-9 was at a concentration of 5.5g/L;
K 12 is 5.5g/L;
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 5.5g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 7
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
135g/L of citric acid;
195g/L ammonium fluoride;
65g/L of 30% hydrogen peroxide;
boric acid 33g/L;
88g/L of sodium dihydrogen phosphate;
6.5g/L of sodium gluconate;
urea 22g/L;
the concentration of AEO-9 is 6.5g/L;
K 12 is 6g/L;
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 5.5g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Example 8
The embodiment provides a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material, which takes water as a solvent and comprises the following components in terms of concentration:
citric acid 95g/L;
230g/L of ammonium fluoride;
30% hydrogen peroxide 70g/L;
boric acid 32g/L;
110g/L sodium dihydrogen phosphate;
8.5g/L of sodium gluconate;
urea 26g/L;
AEO-9 concentration was 8g/L;
K 12 is 8g/L;
the concentration ratio of sodium silicate to anhydrous magnesium sulfate is 2:1, and the concentration of anhydrous magnesium sulfate is 7.8g/L.
When the aluminum-based silicon carbide composite material is used, the surface of the material is white and bright when the aluminum-based silicon carbide composite material is soaked for 2 minutes at room temperature, and no pit of pitting is observed under a 70-time metallographic microscope.
Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (8)
1. The pickling solution for removing ash on the surface of the aluminum-based silicon carbide composite material is characterized by taking water as a solvent, and comprises the following components in terms of concentration:
ammonium fluoride: 150g/L to 250g/L;
oxidizing agent hydrogen peroxide: 40g/L to 100g/L;
organic acid builder: 80g/L to 150g/L;
pH stabilizer: 100g/L to 160g/L;
organic-inorganic composite corrosion inhibitor: 20g/L to 60g/L;
composite surfactant: 5g/L to 20g/L;
anhydrous magnesium sulfate: 5g/L to 15g/L.
2. The pickling solution for removing ash from the surface of an aluminum-based silicon carbide composite material according to claim 1, wherein the pickling solution uses water as a solvent and comprises the following components in terms of concentration:
ammonium fluoride: 180g/L to 230g/L;
oxidizing agent hydrogen peroxide: 50g/L to 90g/L;
organic acid builder: 90g/L to 140g/L;
pH stabilizer: 110g/L to 150g/L;
organic-inorganic composite corrosion inhibitor: 30g/L to 50g/L;
composite surfactant: 8g/L to 18g/L;
anhydrous magnesium sulfate: 6g/L to 12g/L.
3. The pickling solution for removing ash from the surface of an aluminum-based silicon carbide composite material according to claim 2, wherein the pickling solution uses water as a solvent and comprises the following components in terms of concentration:
ammonium fluoride: 200g/L;
oxidizing agent hydrogen peroxide: 60g/L;
organic acid builder: 100g/L;
pH stabilizer: 130g/L;
organic-inorganic composite corrosion inhibitor: 40g/L;
composite surfactant: 10g/L;
anhydrous magnesium sulfate: 10g/L.
4. A pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material according to any one of claims 1 to 3, wherein: the mass concentration of the oxidant hydrogen peroxide is 30%.
5. A pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material according to any one of claims 1 to 3, wherein: the organic acid builder is citric acid.
6. A pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material according to any one of claims 1 to 3, wherein: the pH stabilizer is a mixture of sodium dihydrogen phosphate and boric acid, and the mass ratio of the sodium dihydrogen phosphate to the boric acid is (2-6): 1.
7. a pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material according to any one of claims 1 to 3, wherein: the organic-inorganic composite corrosion inhibitor is a mixture of sodium gluconate, urea and sodium silicate, and the concentrations of the sodium gluconate, the urea and the sodium silicate are 5g/L-10g/L, 5g/L-30g/L and 10g/L-20g/L respectively.
8. A pickling solution for removing ash hanging on the surface of an aluminum-based silicon carbide composite material according to any one of claims 1 to 3, wherein: the composite surfactant is nonionic surfactant AEO-9 and anionic surfactant sodium dodecyl sulfate K 12 And the concentration of the nonionic surfactant AEO-9 is 5g/L to 10g/L, and the anionic surfactant sodium dodecyl sulfate K 12 The concentration of (C) is 5g/L-10g/L.
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