CN113621954B - High corrosion-resistant rust-removing pre-blackening agent and preparation method and application thereof - Google Patents
High corrosion-resistant rust-removing pre-blackening agent and preparation method and application thereof Download PDFInfo
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- CN113621954B CN113621954B CN202110759193.9A CN202110759193A CN113621954B CN 113621954 B CN113621954 B CN 113621954B CN 202110759193 A CN202110759193 A CN 202110759193A CN 113621954 B CN113621954 B CN 113621954B
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- 230000007797 corrosion Effects 0.000 title claims abstract description 57
- 238000005260 corrosion Methods 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 35
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 28
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 15
- 239000003112 inhibitor Substances 0.000 claims abstract description 15
- -1 iron ion Chemical class 0.000 claims abstract description 15
- 239000008139 complexing agent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229960000583 acetic acid Drugs 0.000 claims abstract description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 12
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 12
- XUXNAKZDHHEHPC-UHFFFAOYSA-M sodium bromate Chemical compound [Na+].[O-]Br(=O)=O XUXNAKZDHHEHPC-UHFFFAOYSA-M 0.000 claims abstract description 11
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 6
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 238000009472 formulation Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 3
- 229910001447 ferric ion Inorganic materials 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 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
- C23C22/40—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 molybdates, tungstates or vanadates
-
- 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
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic 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
- C23G1/02—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
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
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- 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)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to the technical field of metal pretreatment, in particular to a high corrosion-resistant rust-removing pre-blackening agent, and a preparation method and application thereof. The rust removing pre-blackening agent comprises the following components in parts by weight: 35-45 parts of phosphoric acid, 0.05-0.15 part of calcium carbonate, 0.15-0.25 part of iron ion complexing agent, 0.55-0.65 part of zinc nitrate, 1.15-1.25 parts of sodium tungstate, 0.15-0.25 part of corrosion inhibitor, 0.55-0.65 part of K12, 0.25-0.35 part of glacial acetic acid, 0.15-0.25 part of sodium bromate and a plurality of water parts. The high corrosion-resistant rust removal pre-blackening agent provided by the invention can complete blackening pretreatment on 2 or more than 2 different materials and different surface states of the same workpiece, so that a uniform and consistent black conversion film is obtained; the black conversion film can be obtained, rust on the surface of a workpiece can be removed, and the corrosion resistance is high.
Description
Technical Field
The invention relates to the technical field of metal pretreatment, in particular to a high corrosion-resistant rust-removing pre-blackening agent, and a preparation method and application thereof.
Background
Phosphating is a common pretreatment technology, and in principle, the phosphating belongs to chemical conversion film treatment, is mainly applied to phosphating of steel surfaces, and can also be applied to phosphating nonferrous metal (such as aluminum and zinc) parts. The purpose of phosphating is mainly as follows: the metal is protected to a certain extent, so that the metal is prevented from being corroded; the paint is used for priming before painting, and improves the adhesive force and the corrosion resistance of a paint film layer; the friction-reducing lubricating effect is achieved in the metal cold working process. The pre-blackening treatment is a pre-treatment process before the phosphating of products, and is indispensable in the processing or use of ferrous metals, finished accessories and precision instrument accessories.
The appearance and the color of different materials are inconsistent, uneven and the corrosion resistance is poor after the existing rust removal pre-blackening agent is treated. Particularly, the pure iron material part is colored integrally and has extremely poor corrosion resistance. In order to overcome the technical defects, the invention provides a novel rust removal pre-blackening agent with high corrosion resistance.
Disclosure of Invention
Therefore, one of the purposes of the invention is to provide a high corrosion-resistant rust-removing pre-blackening agent, which has more uniform rust-removing pre-blackening effect and stronger corrosion resistance through the compounding of different components.
In order to achieve the above purpose, the present invention adopts the following scheme:
the rust removing pre-blackening agent comprises the following components in parts by weight: 35-45 parts of phosphoric acid, 0.05-0.15 part of calcium carbonate, 0.15-0.25 part of iron ion complexing agent, 0.55-0.65 part of zinc nitrate, 1.15-1.25 parts of sodium tungstate, 0.15-0.25 part of corrosion inhibitor, 0.55-0.65 part of sodium dodecyl sulfate (K12), 0.25-0.35 part of glacial acetic acid, 0.15-0.25 part of sodium bromate and a plurality of water.
Preferably, the rust removing pre-blackening agent comprises the following components in parts by weight: 40 parts of phosphoric acid, 0.1 part of calcium carbonate, 0.2 part of iron ion complexing agent, 0.6 part of zinc nitrate, 1.2 parts of sodium tungstate, 0.2 part of corrosion inhibitor, 0.6 part of K12, 0.3 part of glacial acetic acid, 0.2 part of sodium bromate and a plurality of parts of water.
Further, the ferric ion complexing agent is tartaric acid.
Further, the corrosion inhibitor is LAN-826.
The second purpose of the invention is to provide a preparation method of the rust-removing pre-blackening agent.
In order to achieve the above purpose, the present invention adopts the following scheme:
the preparation method of the high corrosion-resistant rust-removing pre-blackening agent comprises the following steps:
1) Adding water in a stirrer according to parts by weight, adding phosphoric acid to stir, and slowly adding calcium carbonate;
2) Sequentially adding zinc nitrate and K12 into the solution obtained in the step 1), stirring, and then adding sodium tungstate aqueous solution;
3) And (3) regulating the pH value of the LAN-826 aqueous solution by using glacial acetic acid, adding the LAN-826 aqueous solution into the solution obtained in the step (2), and finally adding the sodium bromate aqueous solution to stir to obtain the high corrosion-resistant rust removal pre-blackening agent.
Further, in step 1), calcium carbonate is slowly added until the calcium carbonate is completely reacted until no reaction bubbles are generated.
Further, in the step 2), zinc nitrate and K12 are added and stirred for 10 minutes.
Further, the step 3) of adjusting the pH of the LAN-826 aqueous solution to 5-6 with glacial acetic acid.
The invention further aims to provide a method for derusting and pre-blackening workpieces, and by adopting the method, the surfaces of different materials on the same workpiece can be uniformly and consistently provided with black conversion films.
In order to achieve the above object, the present invention adopts the following scheme:
1) The high corrosion-resistant rust-removing pre-blackening agent is adopted, and a workpiece is soaked for 3-5 minutes at 75-85 ℃;
2) The free acid of the soaking solution is 350-400pt, and the soaking solution is poured when the concentration of iron ions is more than or equal to 20 g/L.
Further, the material of the workpiece comprises pure iron and alloy steel.
The invention adopts the technical principle that:
the phosphoric acid mainly provides acidity to corrode corrosion points and other surface states on the surface of a workpiece, then sodium tungstate, zinc nitrate and calcium nitrate are needed to generate a black film on the corroded parts in the corrosion process, and as the acidity of the phosphoric acid is too high, a certain corrosion inhibitor LAN826 is matched with the formation of the black film to prevent the black film generated by high acidity dissolution.
The invention has the beneficial effects that:
the high corrosion-resistant rust removal pre-blackening agent provided by the invention can complete blackening pretreatment on 2 or more than 2 different materials and different surface states of the same workpiece, so that a uniform and consistent black conversion film is obtained; the black conversion film can be obtained, rust on the surface of a workpiece can be removed, and the corrosion resistance is high.
Drawings
FIG. 1 shows the surface of a workpiece treated with the highly corrosion-resistant rust-removing pre-blackening agent prepared by the formulation 1-4 of example 3.
FIG. 2 shows the surface of a workpiece treated with the highly corrosion-resistant rust-removing pre-blackening agent prepared in formulation 5 of example 3.
FIG. 3 is a graph showing the effect of treating a rust-removing pre-blackening agent prepared in formulation 4 for 2 hours in a rust-removing workpiece of example 5.
FIG. 4 is a graph showing the effect of treating a rust-removing pre-blackening agent prepared in formulation 5 for 2 hours in a rust-removing work piece of example 5.
Fig. 5 is a graph showing the effect of treating a workpiece having rust points after soaking in formulation 5 of example 5 with the rust removing pre-blackening agent prepared in formulation 1 for 4 hours.
FIG. 6 is a graph showing the effect of treating a workpiece having rust points after soaking in formulation 5 of example 5 with the rust removing pre-blackening agent prepared in formulation 2 for 4 hours.
FIG. 7 is a graph showing the effect of treating a workpiece having rust points after soaking in formulation 5 of example 5 with the rust removing pre-blackening agent prepared in formulation 3 for 4 hours.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
EXAMPLE 1 high Corrosion resistant rust removing Pre-blackening agent
The components of the rust removing pre-blackening agent were prepared as shown in table 1.
Table 1 formulation
| Formulation of | Phosphoric acid (g) | Calcium carbonate (g) | Iron ion complexing agent (g) | Zinc nitrate (g) | Sodium tungstate (g) | Corrosion inhibitor (g) | K12(g) | Glacial acetic acid (g) | Sodium bromate (g) |
| 1 | 400 | 10 | 2 | 6 | 12 | 2 | 6 | 3 | 2 |
| 2 | 350 | 5 | 1.5 | 5.5 | 11.5 | 1.5 | 5.5 | 2.5 | 1.5 |
| 3 | 450 | 15 | 2 | 6.5 | 12.5 | 2.5 | 6.5 | 3.5 | 2.5 |
| 4 | 400 | 10 | 0 | 6 | 12 | 2 | 6 | 3 | 2 |
| 5 | 400 | 10 | 2 | 6 | 12 | 0 | 6 | 3 | 2 |
The formula 1-5 contains a plurality of parts of water except the components, the unit is g, the iron ion complexing agent in the formula 1 is tartaric acid, and the corrosion inhibitor is LAN-826; the iron ion complexing agent in the formula 2 is ethylenediamine tetraacetic acid, and the corrosion inhibitor is LAN-826; the ferric ion complexing agent in the formula 3 is tartaric acid, and the corrosion inhibitor is BC-304; the corrosion inhibitor in the formula 4 is LAN-826; the ferric ion complexing agent in the formula 5 is ethylenediamine tetraacetic acid.
EXAMPLE 2 preparation of highly Corrosion-resistant rust-removing Pre-blackening agent
Starting from a 1000kg scale preparation, raw materials were prepared and prepared according to the ratios of example 1 formulations 1-5:
1. opening the reaction kettle and starting the stirrer; adding 500kg of pure water into the reaction kettle, adding all phosphoric acid, and starting a stirrer;
2. slowly adding calcium carbonate into the reaction kettle until the calcium carbonate completely has no reaction bubbles in the reaction;
3. sequentially adding zinc nitrate and K12 into the reaction kettle, and stirring for 10min;
4. dissolving sodium tungstate by using 50kg of pure water, and slowly adding the solution into a reaction kettle;
5. diluting LAN-826 with 7kg pure water, slowly adding glacial acetic acid into the diluted solution to adjust the pH value, and slowly adding into a reaction kettle;
6. and finally, 20kg of pure water is used for dissolving sodium bromate, then the sodium bromate is slowly added into a reaction kettle, and finally, the high corrosion-resistant rust-removing pre-blackening agent is prepared.
Example 3 treatment of alloy Steel and pure iron
Soaking a rusted workpiece (alloy steel or pure iron) at 75-85 ℃ for 3-5 minutes by adopting the high corrosion-resistant rust removal pre-blackening agent in the embodiment 2; the rust-bearing workpiece had 3 different surface states (squeeze-phosphate surface state, machine turning surface state, machine grinding surface state).
And monitoring the concentration of free acid and iron ions in the soaking liquid in real time, and pouring the soaking liquid into a tank when the concentration of the free acid is 350-400pt and the concentration of the iron ions is more than or equal to 20g/L, so as to finish the soaking.
After soaking, the appearance of the high corrosion-resistant rust-removing pre-blackening agent prepared by any one of the formulas 1-4 is uniform (as shown in figure 1), a uniform black conversion film is obtained, rust is removed completely, and the workpiece treated by the high corrosion-resistant rust-removing pre-blackening agent of the formula 5 is obviously black and nonuniform, the pure iron part is colored, and the other parts are colored unevenly (as shown by white circles in figure 2).
EXAMPLE 4 Corrosion resistance test
The treated workpiece of example 3 and the untreated workpiece were weighed, and the weight loss and the dimensional loss were calculated, and the results are shown in tables 2 to 3: besides the formula 4-5, the rust-removing and pre-blackening agent does not cause excessive corrosion to the workpiece, and the weight loss and the size loss are small.
TABLE 2 Corrosion resistance test-weight of work piece
TABLE 3 Corrosion resistance test-workpiece size
EXAMPLE 5 Corrosion resistance test
The rust-removing pre-blackening agent prepared by observing the formula 1-3 is soaked in a sodium chloride solution with 5% content at 20 ℃ for more than or equal to 2 hours at 20 ℃ without rust, the rust-removing pre-blackening agent prepared by the formula 4-5 is soaked for less than 2 hours to generate rust spots (shown as white circles in fig. 3 and 4), the rust-removing pre-blackening agent prepared by the formula 1-3 is used for treating the workpiece with rust spots after being soaked in the formula 5, and the rust spots are not generated after being soaked for 4 hours (shown in fig. 5-7). Therefore, the high corrosion-resistant rust-removing pre-blackening agent provided by the invention has the advantages of high corrosion resistance and good pre-blackening effect, and cannot be corroded excessively.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (8)
1. The preparation method of the high corrosion-resistant rust-removing pre-blackening agent is characterized by comprising the following components in parts by weight: 35-45 parts of phosphoric acid, 0.05-0.15 part of calcium carbonate, 0.15-0.25 part of iron ion complexing agent, 0.55-0.65 part of zinc nitrate, 1.15-1.25 parts of sodium tungstate, 0.15-0.25 part of corrosion inhibitor, 0.55-0.65 part of sodium dodecyl sulfate, 0.25-0.35 part of glacial acetic acid, 0.15-0.25 part of sodium bromate and a plurality of water parts; the corrosion inhibitor is LAN-826; the method comprises the following steps:
1) Weighing the following raw materials in parts by weight: 35-45 parts of phosphoric acid, 0.05-0.15 part of calcium carbonate, 0.15-0.25 part of iron ion complexing agent, 0.55-0.65 part of zinc nitrate, 1.15-1.25 parts of sodium tungstate, 0.15-0.25 part of corrosion inhibitor, 0.55-0.65 part of sodium dodecyl sulfate, 0.25-0.35 part of glacial acetic acid, 0.15-0.25 part of sodium bromate and a plurality of water parts; the corrosion inhibitor is LAN-826;
2) Adding water into a stirrer according to the weight part in the step 1), adding phosphoric acid into the stirrer to stir, and slowly adding calcium carbonate into the stirrer;
3) Sequentially adding zinc nitrate and sodium dodecyl sulfate into the solution obtained in the step 2), stirring, and then adding a sodium tungstate aqueous solution;
4) And 3) regulating the pH value of the LAN-826 aqueous solution by glacial acetic acid, adding the LAN-826 aqueous solution into the solution obtained in the step 3), and finally adding the sodium bromate aqueous solution to stir to obtain the high corrosion-resistant rust-removing pre-blackening agent.
2. The method for preparing the high corrosion-resistant rust-removing pre-blackening agent according to claim 1, wherein the rust-removing pre-blackening agent comprises the following components in parts by weight: 40 parts of phosphoric acid, 0.1 part of calcium carbonate, 0.2 part of iron ion complexing agent, 0.6 part of zinc nitrate, 1.2 parts of sodium tungstate, 0.2 part of corrosion inhibitor, 0.6 part of sodium dodecyl sulfate, 0.3 part of glacial acetic acid, 0.2 part of sodium bromate and a plurality of parts of water.
3. The method for preparing the high corrosion-resistant rust-removing pre-blackening agent according to claim 1 or 2, wherein the iron ion complexing agent is tartaric acid.
4. The method for preparing the high corrosion resistant rust removing pre-blackening agent according to claim 1, wherein in the step 2), calcium carbonate is slowly added until the calcium carbonate is completely reacted until no reaction bubbles exist.
5. The method for preparing the high corrosion-resistant rust-removing pre-blackening agent according to claim 1, wherein the time of adding zinc nitrate and sodium dodecyl sulfate for stirring in the step 3) is 10 minutes.
6. The method for preparing the high corrosion resistant rust removing pre-blackening agent according to claim 1, wherein the step 4) is characterized in that the aqueous solution of LAN-826 is adjusted to pH 5-6 by glacial acetic acid.
7. A method of pre-blackening a workpiece, the method comprising the steps of:
1) A high corrosion resistant rust removing pre-blackening agent prepared by the preparation method of any one of claims 1 to 6, wherein the workpiece is soaked for 3 to 5 minutes at 75 to 85 ℃;
2) The free acid of the soaking solution is 350-400pt, and the soaking solution is poured when the concentration of iron ions is more than or equal to 20 g/L.
8. The method of claim 7, wherein the workpiece comprises pure iron and alloy steel.
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| JP2010215936A (en) * | 2009-03-13 | 2010-09-30 | Demlite Co Ltd | Blackening liquid for steel, treatment method for blackening steel, and steel material |
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