CN114032534A - Passivating agent for hydrogen peroxide device before driving and preparation and application methods thereof - Google Patents
Passivating agent for hydrogen peroxide device before driving and preparation and application methods thereof Download PDFInfo
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- CN114032534A CN114032534A CN202111287351.1A CN202111287351A CN114032534A CN 114032534 A CN114032534 A CN 114032534A CN 202111287351 A CN202111287351 A CN 202111287351A CN 114032534 A CN114032534 A CN 114032534A
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- passivating agent
- hydrogen peroxide
- passivating
- acid
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001509 sodium citrate Substances 0.000 claims abstract description 12
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims abstract description 11
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims abstract description 11
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 8
- 238000005260 corrosion Methods 0.000 claims abstract description 8
- 239000003112 inhibitor Substances 0.000 claims abstract description 8
- 150000002978 peroxides Chemical class 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 8
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 6
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical compound [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 claims description 3
- 150000004968 peroxymonosulfuric acids Chemical class 0.000 claims description 3
- 229940045872 sodium percarbonate Drugs 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims description 2
- 150000003077 polyols Chemical class 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 6
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 6
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract description 2
- 238000005554 pickling Methods 0.000 abstract description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 8
- 238000002161 passivation Methods 0.000 description 8
- 239000000600 sorbitol Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 4
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
- 235000010447 xylitol Nutrition 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
Abstract
The invention provides a passivating agent for a hydrogen peroxide device before driving and a preparation and use method thereof, and relates to the field of pickling and passivating of a hydrogen peroxide complete set device. The passivating agent is mainly prepared by dissolving and stirring hydrofluoric acid, sulfamic acid, sodium citrate, disodium ethylene diamine tetraacetate, peroxide, a corrosion inhibitor, an auxiliary agent and the balance of water, and is diluted to be 3-5% of low concentration when in use, and then circulated or soaked. The invention overcomes the defects of the prior art, and the prepared passivating agent does not contain nitric acid and other nitrogen oxides, does not contain heavy metal ions, has good relative stability in a device, can be used at a low concentration and has good economical efficiency.
Description
Technical Field
The invention relates to the field of pickling and passivation of hydrogen peroxide complete equipment, in particular to a passivating agent for a hydrogen peroxide device before driving and a preparation and use method thereof.
Background
The hydrogen peroxide solution is commonly called as hydrogen peroxide, before the complete set of equipment is put into production, welding slag, organic matters (such as protective grease), oxide skin, metal ions and the like can be remained in the processes of transportation, installation and welding, and if the complete set of equipment is directly put into use, the hydrogen peroxide with strong oxidizing property can generate strong exothermic reaction with the substances, so that the accident of equipment driving explosion can be possibly caused.
The equipment, storage tanks and pipelines in the current domestic hydrogen peroxide complete set are all made of stainless steel, and are usually 304L or 316L. The equipment, storage tank and pipeline need to be degreased, pickled and passivated before driving to achieve the aim of smooth driving. After passivation is finished, a hydrogen peroxide stability test is required, and the test is qualified when the relative stability is more than 90%. The prior hydrogen peroxide device passivation processes comprise two processes, wherein after acid cleaning is finished, a nitric acid solution with the concentration of 33% is used for passivation for 2 hours at normal temperature, or an acidic potassium dichromate solution with a certain concentration is used for passivation.
In the two processes, the high-concentration nitric acid used in the former process releases a large amount of nitrogen oxide NOXMoreover, the wastewater contains high-concentration nitrate, which causes serious environmental pollution and wastewater treatment cost; the latter potassium dichromate is a strong carcinogen, can cause serious injury to human bodies, generates waste liquid containing heavy metal chromium, has serious ecological hazard, and is difficult to treat.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a passivating agent before the driving of a hydrogen peroxide device and a preparation and use method thereof, wherein the obtained passivating agent does not contain nitric acid and other nitrogen oxides, does not contain heavy metal ions, can be used at a lower concentration and has good economy.
In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:
the passivating agent for the hydrogen peroxide device before the start of the vehicle is composed of the following substances in percentage by mass: 2-8% of hydrofluoric acid, 2-8% of sulfamic acid, 1-10% of sodium citrate, 1-10% of disodium ethylene diamine tetraacetate, 1-5% of peroxide, 1-3% of corrosion inhibitor, 1-5% of assistant and the balance of deionized water for making up 100%.
Preferably, the peroxide is any one or more of hydrogen peroxide, sodium percarbonate, persulfuric acid, perphosphoric acid, peroxyacetic acid and salts thereof.
Further preferably, the peroxide is peroxyacetic acid.
Preferably, the corrosion inhibitor is one or more of thiourea, urotropin or Lan-826.
Further preferably, the corrosion inhibitor is urotropin.
Preferably, the coagent is at least one polyol containing more than two hydroxyl groups and having greater than or equal to 2 and less than or equal to 8 carbon atoms.
Further preferably, the auxiliary agent is sorbitol.
Preferably, the pH value of the passivating agent is between 2.5 and 5.5.
The preparation process of the passivator comprises the following steps:
(1) preparing materials: weighing and preparing each raw material for later use according to the mass percentage of each component;
(2) preliminary mixing: dissolving sodium citrate and disodium ethylene diamine tetraacetate in deionized water, slowly adding peroxide, and stirring at a rotation speed of 120r/min for 30min to obtain a primary mixture for later use;
(3) and (3) secondary mixing: and slowly adding the initial mixture into hydrofluoric acid and sulfamic acid, stirring for 30min at the rotating speed of 120r/min, finally adding the corrosion inhibitor and the auxiliary agent, and continuously stirring for 30min at the rotating speed of 120r/min to obtain the passivating agent.
Preferably, the using method comprises the steps of diluting the passivating agent to 3-5% of the total concentration of each component, and circularly or soaking and passivating the device for more than 2 hours by adopting the diluted passivating agent at normal temperature.
The invention provides a passivating agent for a hydrogen peroxide device before driving and a preparation and use method thereof, and compared with the prior art, the passivating agent has the advantages that:
(1) the passivating agent does not contain nitric acid and other nitric oxides, and does not release toxic and harmful gases in the using process;
(2) the passivating agent does not contain heavy metal elements, and the waste liquid treatment is relatively simple;
(3) the passivator prepared by the application can be used at low concentration when in use, and has higher economy;
(4) after the passivator prepared by the application is used for processing equipment, the passivator can meet the requirement of a hydrogen peroxide stability test, the relative stability is more than 95%, and the quality of a passivation film formed on the equipment by the passivator meets the requirement of HG/T2387 + 2007 industrial equipment chemical cleaning quality standard on a stainless steel passivation film.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
preparation of a passivating agent: 4kg of sodium citrate and 3kg of disodium ethylene diamine tetraacetate are dissolved in 80kg of deionized water, then the mixture is placed in a stirrer, the rotating speed is adjusted to 120r/min, 2kg of sodium peroxide is slowly added and stirred for 30min, 5kg of hydrofluoric acid and 3kg of sulfamic acid are slowly added and stirred for 30min, and finally 1kg of sorbitol and 2kg of urotropine are added and stirred for 30min to obtain the passivator.
Example 2:
preparation of a passivating agent: 5kg of sodium citrate and 3kg of disodium ethylene diamine tetraacetate are dissolved in 83kg of deionized water, then the mixture is placed in a stirrer, the rotating speed is adjusted to 120r/min, 3kg of persulfuric acid is slowly added and stirred for 30min, then 1kg of hydrofluoric acid and 2kg of sulfamic acid are slowly added and stirred for 30min, and finally 2kg of sorbitol and 1kg of Lan-826 are added and stirred for 30min to obtain the passivator.
Example 3:
preparation of a passivating agent: 3kg of sodium citrate and 2kg of disodium ethylene diamine tetraacetate are dissolved in 81kg of deionized water, then the mixture is placed in a stirrer, the rotating speed is adjusted to 120r/min, 3kg of sodium percarbonate is slowly added and stirred for 30min, then 1kg of hydrofluoric acid and 7kg of sulfamic acid are slowly added and stirred for 30min, and finally 1kg of sorbitol and 2kg of thiourea are added and stirred for 30min to obtain the passivator.
Example 4:
preparation of a passivating agent: 1kg of sodium citrate and 7kg of disodium ethylene diamine tetraacetate are dissolved in 73kg of deionized water, then the mixture is placed in a stirrer, the rotating speed is adjusted to 120r/min, 3kg of peroxyacetic acid is slowly added and stirred for 30min, 5kg of hydrofluoric acid and 5kg of sulfamic acid are slowly added and stirred for 30min, and finally 2kg of xylitol, 1kg of sorbitol and 3kg of Lan-826 are added and stirred for 30min to obtain the passivator.
Example 5:
preparation of a passivating agent: dissolving 7kg of sodium citrate and 1kg of disodium ethylene diamine tetraacetate in 76kg of deionized water, then placing the mixture in a stirrer, adjusting the rotating speed to 120r/min, slowly adding 3kg of sodium persulfate, stirring for 30min, slowly adding 4kg of hydrofluoric acid and 4kg of sulfamic acid, continuously stirring for 30min, finally adding 3kg of glycerol, 1kg of urotropine and 1kg of Lan-826, and stirring for 30min to obtain the passivator.
Comparative example 1:
preparation of a passivating agent: dissolving 7kg of sodium citrate in 80kg of deionized water, placing the mixture in a stirrer, adjusting the rotating speed to 120r/min, slowly adding 2kg of sodium peroxide, stirring for 30min, slowly adding 5kg of hydrofluoric acid and 3kg of sulfamic acid, continuously stirring for 30min, finally adding 1kg of sorbitol and 2kg of urotropine, and stirring for 30min to obtain the passivator.
Comparative example 2:
preparation of a passivating agent: dissolving 7kg of disodium ethylene diamine tetraacetate in 80kg of deionized water, placing the mixture in a stirrer, adjusting the rotating speed to 120r/min, slowly adding 2kg of sodium peroxide, stirring for 30min, slowly adding 5kg of hydrofluoric acid and 3kg of sulfamic acid, continuously stirring for 30min, finally adding 1kg of sorbitol and 2kg of urotropine, and stirring for 30min to obtain the passivator.
Comparative example 3:
preparation of a passivating agent: dissolving 7kg of sodium citrate in 80kg of deionized water, placing the mixture in a stirrer, adjusting the rotating speed to 120r/min, slowly adding 2kg of sodium peroxide, stirring for 30min, slowly adding 8kg of sulfamic acid, continuously stirring for 30min, and finally adding 1kg of sorbitol and 2kg of urotropine, and stirring for 30min to obtain the passivator.
And (3) detection:
1. selecting the passivating agents obtained in the above examples 1-5, respectively adding deionized water to dilute the passivating agents to 3%, 4% and 5% of the original concentration, soaking the surface of the stainless steel with the diluted passivating solution at normal temperature for 2h, drying, and detecting according to the requirements of HG/T2387-:
TABLE 1
2. Selecting the passivators obtained in the comparative examples 1-3 as control groups 1-3 respectively, selecting a nitric acid solution with the concentration of 33% as a control group 4, setting the passivators prepared in the examples 1-5 as experiment groups 1-5, adding deionized water into the passivators in the experiment groups 1-5 and the control groups 1-3 to dilute the passivators to 4% of the original concentration, then respectively adopting the solutions in the control groups and the experiment groups to carry out circulating or soaking passivation treatment on the equipment and the pipeline for 2 hours at normal temperature, then drying, selecting hydrogen peroxide with the concentration of 27.5% and the stability of more than 97% to carry out circulating spray soaking on the equipment and the pipeline for more than 4 hours, soaking for more than 6 hours, and measuring the relative stability of the hydrogen peroxide in each group after 10 hours, wherein the results are shown in the following table 2:
TABLE 2
The above table shows that the passivating agent prepared by the invention can passivate a device at low concentration, and effectively ensures that hydrogen peroxide maintains higher relative stability in the processing and storing processes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The passivating agent for the hydrogen peroxide device before the start of the vehicle is characterized by comprising the following substances in percentage by mass: 2-8% of hydrofluoric acid, 2-8% of sulfamic acid, 1-10% of sodium citrate, 1-10% of disodium ethylene diamine tetraacetate, 1-5% of peroxide, 1-3% of corrosion inhibitor, 1-5% of assistant and the balance of deionized water for making up 100%.
2. A passivating agent before a hydrogen peroxide device is driven according to claim 1, which is characterized in that: the peroxide is any one or more of hydrogen peroxide, sodium percarbonate, persulfuric acid, perphosphoric acid, peroxyacetic acid and salts thereof.
3. A passivating agent before a hydrogen peroxide device is driven according to claim 1, which is characterized in that: the corrosion inhibitor is any one or more of thiourea, urotropine or Lan-826.
4. A passivating agent before a hydrogen peroxide device is driven according to claim 1, which is characterized in that: the auxiliary agent is at least one polyol containing more than two hydroxyl groups and having 2 or more and 8 or less carbon atoms.
5. A passivating agent before a hydrogen peroxide device is driven according to claim 1, which is characterized in that: the pH value of the passivating agent is between 2.5 and 5.5.
6. The preparation method of the passivating agent before the start-up of the hydrogen peroxide device according to claim 1, wherein the preparation process of the passivating agent comprises the following steps:
(1) preparing materials: weighing and preparing each raw material for later use according to the mass percentage of each component;
(2) preliminary mixing: dissolving sodium citrate and disodium ethylene diamine tetraacetate in deionized water, slowly adding peroxide and stirring for 30min to obtain a primary mixture for later use;
(3) and (3) secondary mixing: and slowly adding hydrofluoric acid and sulfamic acid into the primary mixture, stirring for 30min, finally adding the corrosion inhibitor and the auxiliary agent, and continuously stirring for 30min to obtain the passivating agent.
7. The method for preparing the passivating agent before the start-up of the hydrogen peroxide device according to claim 6, wherein the rotation speed of the stirring in the steps (2) and (3) is 120 r/min.
8. A method of using a passivating agent before a hydrogen peroxide plant is driven according to claim 1, characterized in that: the using method comprises the steps of diluting the passivating agent to 3-5% of the total concentration of each component, and circularly or soaking and passivating the device for more than 2 hours at normal temperature by adopting the diluted passivating agent.
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