CN113755846B - Poly-dopamine modified aluminum tripolyphosphate corrosion inhibitor and preparation method and application thereof - Google Patents
Poly-dopamine modified aluminum tripolyphosphate corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN113755846B CN113755846B CN202110951147.9A CN202110951147A CN113755846B CN 113755846 B CN113755846 B CN 113755846B CN 202110951147 A CN202110951147 A CN 202110951147A CN 113755846 B CN113755846 B CN 113755846B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 108
- 230000007797 corrosion Effects 0.000 title claims abstract description 105
- 239000003112 inhibitor Substances 0.000 title claims abstract description 63
- 235000019832 sodium triphosphate Nutrition 0.000 title claims abstract description 48
- 229920001690 polydopamine Polymers 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- -1 modified aluminum tripolyphosphate Chemical class 0.000 title claims abstract description 20
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000243 solution Substances 0.000 claims abstract description 32
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 30
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims abstract description 30
- 229960003638 dopamine Drugs 0.000 claims abstract description 16
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 7
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 13
- 230000005764 inhibitory process Effects 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 8
- 239000000758 substrate Substances 0.000 abstract description 8
- 239000000945 filler Substances 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000008901 benefit Effects 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical group [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000002122 magnetic nanoparticle Substances 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 229920000428 triblock copolymer Polymers 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000005406 washing 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/184—Phosphorous, arsenic, antimony or bismuth containing compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the field of metal corrosion and protection, in particular to a polydopamine modified aluminum tripolyphosphate corrosion inhibitor and a preparation method and application thereof, wherein the preparation method of the polydopamine modified aluminum tripolyphosphate corrosion inhibitor comprises the following preparation steps: adding dopamine and tris (hydroxymethyl) aminomethane into a pre-dispersion liquid containing aluminum tripolyphosphate for polymerization reaction; step two, after the solution of the reaction system in the step one is black or dark brown, centrifuging the solution of the reaction system to obtain a precipitate, and drying to obtain the corrosion inhibitor; wherein the molar ratio of the aluminum tripolyphosphate to the dopamine is (3.5-18): (19-53). According to the preparation method of the polydopamine modified aluminum tripolyphosphate corrosion inhibitor, polydopamine is coated on the surface of aluminum tripolyphosphate filler particles and is attached to a metal substrate through polydopamine; thereby further playing a role in corrosion inhibition and enabling the anti-corrosion effect to be more durable.
Description
Technical Field
The invention relates to the field of metal corrosion and protection, in particular to a polydopamine modified aluminum tripolyphosphate corrosion inhibitor, and a preparation method and application thereof.
Background
In the age of continuous increase of engineering demands nowadays, steel has become an indispensable metal material in various industries such as aerospace, automobiles, mechanical manufacturing, ships and the like. However, the world suffers from a huge economic loss each year due to corrosion of metallic materials. It is reported that the direct economic loss caused by metal corrosion is about 7000 hundred million dollars each year worldwide, the loss caused by metal corrosion in China is about 5% of the total national production value (GDP), and besides the direct economic loss, corrosion also causes a series of indirect economic losses such as shutdown, product degradation, efficiency reduction and the like; in addition, metal corrosion can also cause significant engineering safety accidents and serious environmental pollution. Therefore, the method has very important engineering significance in corrosion prevention research of metals.
Corrosion protection techniques are various, wherein the addition of a corrosion inhibitor is one of the methods for protecting metals and their alloys from corrosion, and the addition of a small amount of corrosion inhibitor can effectively inhibit the corrosion of metals and their alloys. Compared with other corrosion prevention technologies, the addition of the corrosion inhibitor has some remarkable advantages, such as no need of special equipment, simple control, low price, simple and convenient operation, etc. Considering the good anti-corrosion effect and good economic benefit of the corrosion inhibitor, the corrosion inhibitor has been widely applied to the fields of petroleum exploitation and processing, acid washing, industrial circulating water systems and the like.
Most conventional corrosion inhibitors are highly toxic and severely polluting the environment, such as chromates, which impose severe restrictions on the use of hexavalent chromium by environmental protection in many countries due to their toxicity and potentially carcinogenic nature. There are also some chromium-free corrosion inhibitors, for example, patent number CN201210575345, publication date 2013, 04, 03, and patent document entitled "method for modifying organic corrosion inhibitor by magnetic functionalization" disclose a method for compounding an organic corrosion inhibitor with a magnetic nanomaterial to improve the corrosion inhibition effect of the organic corrosion inhibitor, which specifically includes: dispersing the magnetic nano particles in an organic corrosion inhibitor and uniformly mixing; adding a proper amount of surfactant; adjusting acidity; an initiator is added to realize organic-inorganic compounding at a set temperature, but the method needs to carry out magnetic function modification and has limited application fields.
For another example, the patent number is CN201710858303, the publication date is 2018, 01 and 30, and the patent document named as a polymer type efficient compound corrosion inhibitor, a preparation method and application thereof discloses a ternary compound corrosion inhibitor, which specifically comprises a main corrosion inhibitor, an auxiliary corrosion inhibitor, a surfactant and deionized water; the main corrosion inhibitor is a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer; the auxiliary corrosion inhibitor is polyethylene glycol octyl phenyl ether; the surfactant is cetyl trimethyl ammonium bromide. Because the formula is complex, the raw materials are more, the cost is higher, and the practical application value is low.
Disclosure of Invention
In order to solve the defects of complex preparation components and process and high cost of the corrosion inhibitor with good corrosion inhibition effect in the prior art, the invention provides a preparation method of a polydopamine modified aluminum tripolyphosphate corrosion inhibitor, which comprises the following preparation steps:
adding dopamine and tris (hydroxymethyl) aminomethane into a pre-dispersion liquid containing aluminum tripolyphosphate for polymerization reaction;
step two, after the solution of the reaction system in the step one is black or dark brown, centrifuging the solution of the reaction system to obtain a precipitate, and drying to obtain the corrosion inhibitor;
wherein the molar ratio of the aluminum tripolyphosphate to the dopamine is (3.5-18): (19-53).
Preferably, the polymerization reaction is carried out in a stirring state so as to ensure that the solution system is uniformly mixed and the reaction is smoothly carried out.
Preferably, stirring is continued for 10-24 hours after the solution of the reaction system in the first step is black or dark brown, so that the polydopamine can be uniformly coated on the surface of the aluminum tripolyphosphate.
In one possible embodiment, the pre-dispersion is prepared by mixing aluminum tripolyphosphate with water at a ratio of 80 to 600mL/g and dispersing by ultrasound for 10 to 20 minutes.
In one possible embodiment, the total mass of the aluminum tripolyphosphate to dopamine is in the range of 0.08 to 1.3 for the ratio of the tris.
In one possible embodiment, the composition comprises, by mass, 0.1% -0.5% of aluminum tripolyphosphate, 0.3% -0.8% of dopamine, 1% -5% of tris (hydroxymethyl) aminomethane, and the balance of water.
In one possible embodiment, the precipitate is vacuum dried at 50-80 ℃.
In one possible embodiment, the polymerization temperature is 20 to 25 ℃.
In one possible embodiment, the pH of the reaction system solution is 8 to 9.5.
The invention also provides a corrosion inhibitor which is prepared by adopting the preparation method of the polydopamine modified aluminum tripolyphosphate corrosion inhibitor.
The invention also provides an application of the corrosion inhibitor in inhibiting carbon steel corrosion in seawater medium.
In one possible embodiment, the corrosion inhibitor is present in the seawater medium in an amount of 0.5% to 5% by mass.
Based on the above, compared with the prior art, the preparation method of the polydopamine modified aluminum tripolyphosphate corrosion inhibitor provided by the invention has at least the following technical effects:
1. the dopamine can be self-polymerized in the aerobic solution to generate polydopamine, and the catechol group on the polydopamine has strong metal chelating capacity due to the electron withdrawing effect of the hydroxyl, so that stable organic metal complex can be formed on the surface of the material, and a layer of passivation film is formed on the surface of the metal substrate, thereby effectively isolating the corrosion of the corrosive medium to the metal substrate and remarkably reducing the corrosion and rust condition of the metal substrate under the condition of seawater medium;
2. the polydopamine is uniformly coated on the surface of the aluminum tripolyphosphate filler particles in a stirring state, and the aluminum tripolyphosphate particles coated with polydopamine are attached to the metal base material through polydopamine; under the corrosion action of seawater medium, after the polydopamine film attached to the surface of the aluminum tripolyphosphate is destroyed, aluminum tripolyphosphate filler particles with rust prevention can be released, so that the corrosion inhibition effect is further achieved, and the corrosion prevention effect is more durable;
3. the trimethylol aminomethane is an alcohol amine organic compound, and in the presence of the trimethylol aminomethane, the coating property of polydopamine on aluminum tripolyphosphate particles and the adsorptivity among the coated aluminum tripolyphosphate particles can be improved, the combination among the coated aluminum tripolyphosphate particles is further enhanced, and the compactness of a passivation film attached to the surface of a metal substrate and the adhesive force of the passivation film on the metal substrate are improved;
4. the corrosion inhibitor preparation component and the process can be used for carrying out anti-corrosion treatment on steel parts exposed to marine atmospheric environment independently, and can also be used as pretreatment before organic coating is applied.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, the drawings that are needed in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art; the positional relationships described in the drawings in the following description are based on the orientation of the elements shown in the drawings unless otherwise specified.
FIG. 1 is a physical diagram of the corrosion morphology of Q235 steel in a blank group solution system;
FIG. 2 is a graphical representation of the corrosion morphology of Q235 steel in a solution system containing the corrosion inhibitor of example 1;
FIG. 3 is a graphical representation of the corrosion morphology of Q235 steel in a solution system containing the corrosion inhibitor of comparative example 1;
FIG. 4 is a graphical representation of the corrosion morphology of Q235 steel in a solution system containing the corrosion inhibitor of comparative example 2;
FIG. 5 is a graphical representation of the corrosion morphology of Q235 steel in a solution system containing the corrosion inhibitor of comparative example 3;
FIG. 6 is a graphical representation of the corrosion morphology of Q235 steel in a solution system containing the corrosion inhibitor of comparative example 4.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; the technical features designed in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; 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.
In the description of the present invention, it should be noted that all terms used in the present invention (including technical terms and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs and are not to be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides the example formula (mass percent) shown in the following table:
TABLE 1
| Component (A) | Example 1 | Example 2 | Example 3 |
| Aluminum tripolyphosphate | 0.1％ | 0.3％ | 0.5％ |
| Dopamine | 0.3％ | 0.6％ | 0.8％ |
| Trimethylolaminomethane | 1％ | 3％ | 5％ |
The balance of the compositions in example 1, example 2 and example 3 are water, specifically deionized water.
The preparation method of the above example comprises the following preparation steps:
s100, mixing aluminum tripolyphosphate and water according to the proportion of 180mL/g, and performing ultrasonic dispersion for 15min to obtain a pre-dispersion liquid.
S200, adding dopamine and tris (hydroxymethyl) aminomethane into the pre-dispersion liquid of S100, stirring uniformly, adjusting the pH value of the mixed liquid to 8-9, carrying out polymerization reaction at 20-25 ℃, and continuing stirring for 24 hours at 20-25 ℃ after the color of the reaction system solution changes from transparent to reddish brown and then changes from reddish brown to blackish brown or black.
S300, centrifuging the black or black brown solution obtained in the step S200, collecting the precipitate, and vacuum drying the collected precipitate at 60-70 ℃ to obtain the corrosion inhibitor.
The invention also provides corrosion inhibitors as shown in the following table as comparative examples:
comparative example 1
Aluminum tripolyphosphate is used as a corrosion inhibitor;
comparative example 2
Dopamine is used as a corrosion inhibitor;
comparative example 3
The tris (hydroxymethyl) aminomethane in the example was removed, and the contents of dopamine and aluminum tripolyphosphate were kept the same as those in the example, and the filler obtained by the same preparation method as that in the example was used as a corrosion inhibitor.
Comparative example 4
The equal mass of the tris (hydroxymethyl) aminomethane in the example is replaced by potassium dihydrogen phosphate, the content of dopamine and aluminum tripolyphosphate is kept consistent with that of the example, and the filler obtained by the preparation method same as that of the example is adopted as a corrosion inhibitor.
The corrosion inhibitors prepared in the above examples and comparative examples were tested for electrochemical ac impedance spectrum and potentiodynamic polarization curve, and the specific test method was as follows:
firstly, taking a sodium chloride solution with the mass fraction of 3.5% as a neutral medium solution for simulating a seawater medium, and respectively adding the corrosion inhibitors prepared in the above examples and comparative examples into the neutral medium solution to obtain different solution systems; wherein the mass fraction of the corrosion inhibitor in the solution system is 1%, and deionized water is adopted as the solvent;
then respectively placing Q235 steel in the different solution systems, testing the different systems by adopting an electrochemical workstation, and obtaining electrochemical parameters and corrosion inhibition efficiency of different corrosion inhibitor formulas through fitting calculation: wherein, the formula for calculating the corrosion inhibition efficiency of each corrosion inhibitor by the electrochemical parameters obtained by fitting is as follows:
in the above, i inh A/cm, the corrosion current density in the presence of corrosion inhibitor 2 ；
i corr Is corrosion current density without corrosion inhibitor, A/cm 2 。
The corrosion morphology of the Q235 steel in different solution systems is shown in figures 1 to 6, and the electrochemical parameters and corrosion inhibition efficiency data are shown in table 2:
TABLE 2
As can be seen from the test results of Table 2, the corrosion inhibition effect of the examples is superior to that of the comparative examples, the corrosion inhibition efficiency is as high as 86%, and the corrosion inhibitor prepared by the preparation method provided by the invention has excellent corrosion inhibition effect on Q235 steel in neutral medium;
the test effects of comparative examples 1 and 2 show that aluminum tripolyphosphate or polydopamine alone cannot play a good corrosion inhibition role on a metal substrate in a neutral medium, and comparative examples 3 and 4 show that tris (hydroxymethyl) aminomethane has a promotion role on polydopamine modified aluminum tripolyphosphate, namely, the bonding between coated aluminum tripolyphosphate particles can be enhanced, the adhesion of polydopamine to the metal substrate is improved, and the corrosion inhibition efficiency of polydopamine modified aluminum tripolyphosphate is further improved.
In addition, as can be seen from the corrosion topography diagrams of fig. 1 to 6, the corrosion amount of the embodiment 1 is the least, the corrosion degree is the least, and only a trace amount of pitting corrosion is performed, while the corrosion degrees of the comparative example 4, the comparative example 3, the comparative example 2 and the comparative example 1 are deeper and deeper, which again shows that the corrosion inhibitor of the polydopamine modified aluminum tripolyphosphate provided by the invention has excellent corrosion inhibition effect and excellent modification effect on the aluminum tripolyphosphate.
In addition, it should be understood by those skilled in the art that although many problems exist in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A preparation method of a polydopamine modified aluminum tripolyphosphate corrosion inhibitor is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
adding dopamine and tris (hydroxymethyl) aminomethane into a pre-dispersion liquid containing aluminum tripolyphosphate for polymerization reaction;
continuously stirring the solution of the reaction system in the step I for 10-24 hours after the solution is black or dark brown so that polydopamine can be uniformly coated on the surface of aluminum tripolyphosphate, centrifuging the solution of the reaction system to obtain a precipitate, and drying to obtain the corrosion inhibitor;
wherein the molar ratio of the aluminum tripolyphosphate to the dopamine is (3.5-18): (19-53);
the polymerization temperature is 20-25 ℃;
the pH of the reaction system solution is 8-9.5.
2. The method for preparing the polydopamine modified aluminum tripolyphosphate corrosion inhibitor according to claim 1, which is characterized in that: the pre-dispersion liquid is prepared by mixing aluminum tripolyphosphate and water according to the proportion of 80-600 mL/g and dispersing the mixture by ultrasonic for 10-20 min.
3. The method for preparing the polydopamine modified aluminum tripolyphosphate corrosion inhibitor according to claim 1, which is characterized in that: the ratio of the total mass of the aluminum tripolyphosphate and the dopamine to the mass of the tris (hydroxymethyl) aminomethane is in the range of 0.08-1.3.
4. The method for preparing the polydopamine modified aluminum tripolyphosphate corrosion inhibitor according to claim 1, which is characterized in that: comprises, by mass, 0.1 to 0.5% of aluminum tripolyphosphate, 0.3 to 0.8% of dopamine, 1 to 5% of tris (hydroxymethyl) aminomethane, and the balance of water.
5. The method for preparing the polydopamine modified aluminum tripolyphosphate corrosion inhibitor according to claim 1, which is characterized in that: the precipitate is dried in vacuum at 50-80 ℃.
6. A corrosion inhibitor, characterized in that: the method for preparing the polydopamine modified aluminum tripolyphosphate corrosion inhibitor according to any one of claims 1 to 5.
7. Use of the corrosion inhibitor according to claim 6 for inhibiting corrosion of carbon steel in seawater media.
8. The use according to claim 7, characterized in that: the mass fraction of the corrosion inhibitor in the seawater medium is 0.5% -5%.
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