CN115505117A - Ureido pyrimidone derivative pickling corrosion inhibitor and preparation method and application thereof - Google Patents
Ureido pyrimidone derivative pickling corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN115505117A CN115505117A CN202211193972.8A CN202211193972A CN115505117A CN 115505117 A CN115505117 A CN 115505117A CN 202211193972 A CN202211193972 A CN 202211193972A CN 115505117 A CN115505117 A CN 115505117A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 115
- 238000005260 corrosion Methods 0.000 title claims abstract description 115
- 238000005554 pickling Methods 0.000 title claims abstract description 47
- BNCPSJBACSAPHV-UHFFFAOYSA-N (2-oxo-1h-pyrimidin-6-yl)urea Chemical class NC(=O)NC=1C=CNC(=O)N=1 BNCPSJBACSAPHV-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003112 inhibitor Substances 0.000 title claims description 83
- 238000002360 preparation method Methods 0.000 title claims description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 15
- -1 amine compound Chemical class 0.000 claims abstract description 15
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 claims abstract description 15
- 229920000570 polyether Polymers 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 14
- 125000004386 diacrylate group Chemical group 0.000 claims abstract description 14
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 14
- 238000006845 Michael addition reaction Methods 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 claims abstract description 7
- 239000000837 restrainer Substances 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 14
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 9
- 239000007795 chemical reaction product Substances 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 5
- 239000001257 hydrogen Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 125000004433 nitrogen atom Chemical group N* 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 230000010287 polarization Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000013213 extrapolation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Chemical group 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- 238000012876 topography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33396—Polymers modified by chemical after-treatment with organic compounds containing nitrogen having oxygen in addition to nitrogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/47—One nitrogen atom and one oxygen or sulfur atom, e.g. cytosine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
-
- 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
- C23G1/063—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors heterocyclic compounds
Abstract
A ureido pyrimidone derivative restrainer has quadruple hydrogen bonds and rich O, N atoms, is obtained by Michael addition reaction of a ureido pyrimidone-polyether amine compound and polyethylene glycol diacrylate, and after the ureido pyrimidone-polyether amine compound and the polyethylene glycol diacrylate are added into a pickling solution, O, N element can interact with a metal surface in the process of pickling the metal material, and an adsorption film is more compact due to the existence of the quadruple hydrogen bonds, so that corrosion of a corrosive medium to the metal surface is effectively blocked, and a good corrosion inhibition effect is shown.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a ureido pyrimidone derivative pickling inhibitor, and a preparation method and application thereof.
Background
Since the date of metal discovery, metal corrosion has become a material science issue, and the importance of corrosion protection is self-evident. Corrosion is defined as the gradual degradation of the material's properties caused by the chemical and/or electrochemical reaction of the material with the surrounding environment. In the petroleum and natural gas industry, metal pipelines and gathering and transportation tanks face serious acid corrosion problems in the oil and gas exploration, production, transmission and processing processes, common metal equipment also faces the harm of acid corrosion in the acid cleaning, descaling and rust removing processes, and in order to prevent the serious corrosion caused by the acid environment, the use of the corrosion inhibitor is one of the most economical and reliable methods for controlling the corrosion of metal facilities.
The corrosion inhibitor can be divided into an inorganic corrosion inhibitor and an organic corrosion inhibitor containing oxygen, nitrogen, sulfur, aromatic heterocyclic ring and other structures according to the component properties, most of the traditional metal corrosion inhibitors are easy to cause heavy metal pollution to the environment, and part of sulfur and phosphorus containing organic micromolecule corrosion inhibitors are discharged into the environment and can also cause water eutrophication. Therefore, the development of a novel replaceable corrosion inhibitor which is green, environment-friendly, economical and efficient and has a simple preparation process is the development direction of the current corrosion inhibitor.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a ureido pyrimidone derivative pickling corrosion inhibitor with good corrosion inhibition effect, and a preparation method and application thereof.
In order to realize the purpose, the technical scheme of the invention is as follows:
a ureido pyrimidone derivative pickling corrosion inhibitor has a structure shown in a formula I or a formula II:
wherein x + y =100,2 is not less than n and not more than 84.
A method for preparing a ureido pyrimidone derivative pickling corrosion inhibitor, wherein the structure of the corrosion inhibitor is shown as a formula I in claim 1, and the method comprises the following steps:
and carrying out Michael addition on the ureido pyrimidone-polyether amine compound shown in the formula II and polyethylene glycol diacrylate to obtain the corrosion inhibitor.
The molar ratio of the ureido pyrimidone-polyether amine compound to the polyethylene glycol diacrylate is 1-2:1.
The preparation method specifically comprises the following steps: firstly, adding the ureido pyrimidone-polyether amine compound and the polyethylene glycol diacrylate into a solvent according to a certain proportion, then reacting for 12-48 hours at 25-60 ℃ to obtain a reaction product, and then removing the solvent in the reaction product to obtain the viscous faint yellow corrosion inhibitor.
The reaction temperature is 25-50 ℃.
The solvent is at least one of dichloromethane, tetrahydrofuran and absolute ethyl alcohol.
An application of a ureido pyrimidone derivative pickling corrosion inhibitor, which is applied to the field of metal corrosion prevention.
The application method comprises the following steps: the corrosion inhibitor is added into the pickling solution of the metal material, and the concentration of the corrosion inhibitor in the pickling solution is 5-600mg/L.
The concentration of the corrosion inhibitor in the pickling solution is 100-500mg/L.
The metal material is carbon steel.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a ureido pyrimidone derivative pickling corrosion inhibitor with a specific structure, which can be spontaneously adsorbed on a metal surface to form a film, wherein lone pair electrons of O, N atoms in the corrosion inhibitor are coordinated with iron atoms of an empty orbit provided by the metal surface to form a chemical bond, so that the corrosion inhibitor is adsorbed on the metal surface to form an adsorption film, and meanwhile, polymer molecules of the corrosion inhibitor are connected together through intermolecular acting force due to existence of four-fold hydrogen bonds of ureido pyrimidone, so that the adsorption film is more compact. Therefore, the present invention has a good corrosion inhibition effect.
2. The ureido pyrimidone derivative pickling corrosion inhibitor is preferably of a structure shown in a formula I, and is prepared by a ureido pyrimidone-polyether amine compound shown in a formula II and polyethylene glycol diacrylate through Michael addition, on one hand, the hydrophilic performance of the ureido pyrimidone-polyether amine compound is improved by introducing a water-soluble polymer, so that the corrosion inhibitor has better applicability in a water-based system; on the other hand, the preparation method has high reaction activity and simple operation. Therefore, the invention not only has good applicability with aqueous corrosive medium, but also has simple and efficient preparation process.
Drawings
FIG. 1 is a graph showing electrochemical polarization curves of comparative example and examples 1, 2 and 4.
FIG. 2 is an SEM scan of a metal coupon prior to pickling.
Fig. 3 is a SEM scan of the comparative example.
FIG. 4 is a SEM scan of example 3.
FIG. 5 is a SEM scan of example 4.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the detailed description.
A ureido pyrimidone derivative pickling corrosion inhibitor has a structure shown in a formula I or a formula II:
wherein x + y =100,2 is not less than n and not more than 84.
A method for preparing a ureido pyrimidone derivative pickling corrosion inhibitor, wherein the structure of the corrosion inhibitor is shown as a formula I in claim 1, and the method comprises the following steps:
and carrying out Michael addition on the ureido pyrimidone-polyether amine compound shown in the formula II and polyethylene glycol diacrylate to obtain the corrosion inhibitor.
The molar ratio of the ureido pyrimidone-polyether amine compound to the polyethylene glycol diacrylate is 1-2:1.
The preparation method specifically comprises the following steps: firstly, adding the ureido pyrimidone-polyether amine compound and the polyethylene glycol diacrylate into a solvent according to a certain proportion, then reacting for 12-48 hours at 25-60 ℃ to obtain a reaction product, and then removing the solvent in the reaction product to obtain the viscous faint yellow corrosion inhibitor.
The reaction temperature is 25-50 ℃.
The solvent is at least one of dichloromethane, tetrahydrofuran and absolute ethyl alcohol.
An application of a ureido pyrimidone derivative acid pickling corrosion inhibitor, which is applied to the field of metal corrosion prevention.
The application method comprises the following steps: the corrosion inhibitor is added into the pickling solution of the metal material, and the concentration of the corrosion inhibitor in the pickling solution is 5-600mg/L.
The concentration of the corrosion inhibitor in the pickling solution is 100-500mg/L.
The metal material is carbon steel.
The invention provides a ureido pyrimidone derivative pickling corrosion inhibitor which is a ureido pyrimidone derivative, the raw materials are simple and easy to obtain, the synthesis process is a Michael addition reaction, the reaction activity is high, the operation is simple, and the Michael addition reaction equation is as follows:
the ureidopyrimidinone-polyetheramine complexes of formula II of the present invention may be prepared according to the literature: prepared by the method described in Tong Liu, haichao zhao, dawei zhang, ultrafast and high-efficiency self-catalysis oxidation reactions with active multiple hydrogenes for correction protection [ J ] corosion science, 2021.7 (15). 187.
The slow release mechanism of the corrosion inhibitor is as follows:
the corrosion inhibitor contains a large number of O, N atoms which can generate chemical interaction with the surface of steel to form coordinate bonds, so that the corrosion inhibitor can be spontaneously adsorbed on the surface of metal to form a film, and simultaneously quadruple hydrogen bonds existing in molecules of the corrosion inhibitor enable the adsorption film to be more compact, thereby effectively improving the barrier of the corrosion inhibitor to a corrosive medium and preventing the corrosive medium from corroding the metal. Because the intermolecular force and the chemical adsorption have synergistic effect and are performed spontaneously, the corrosion inhibitor provides a guarantee for protecting the metal surface of the carbon steel in an acid solution.
In a corrosive medium, the existence of the ureido pyrimidone derivative pickling corrosion inhibitor can simultaneously inhibit a cathode hydrogen evolution reaction and an anode reaction (mainly embodied as iron dissolution) in a corrosion electrochemical process, so as to inhibit the cathode reaction mainly, and as the addition concentration of the corrosion inhibitor is increased, the corrosion current density of metal is gradually reduced, the corrosion rate is gradually reduced, and the corrosion degree to the metal surface is gradually weakened.
Example 1:
a ureido pyrimidone derivative restrainer has a structure shown in formula I:
where x =9, y =91, n =2.
The preparation method of the ureido pyrimidone derivative pickling corrosion inhibitor sequentially comprises the following steps:
step one, adding a ureido pyrimidone-polyether amine compound shown in a formula II and polyethylene glycol diacrylate into a tetrahydrofuran solvent according to a molar ratio of 1:1 to obtain a reaction system:
and step two, stirring the reaction system for 48 hours at the temperature of 25 ℃ and the speed of 2500r/min to obtain a reaction product.
And step three, distilling the reaction product at 30 ℃ under reduced pressure to remove tetrahydrofuran, and then drying the reaction product for 4 hours at 60 ℃ in vacuum to obtain the viscous faint yellow corrosion inhibitor.
At normal temperature, the corrosion inhibitor is added into 1mol/L pickling solution HCl solution, so that the concentration of the corrosion inhibitor in the pickling solution is 100mg/L, and the exposed area is 1cm 2 The Q235 steel is used as a metal sample, the metal sample is immersed in the pickling solution added with the corrosion inhibitor for 6 hours, then an electrochemical polarization curve test is carried out on the metal sample (relevant parameters of the polarization curve are obtained by analyzing through Tafel extrapolation) and the corrosion inhibition efficiency is calculated, and the result shows that the corrosion inhibition efficiency is 92.53%.
Example 2:
the difference from example 1 is that:
x＝6，y＝94，n＝5。
in the second step, the reaction temperature is 37.5 ℃, the stirring speed is 1500r/min, and the reaction time is 30 hours.
In the third step, the reduced pressure distillation temperature is 45 ℃, the vacuum drying temperature is 40 ℃ and the time is 6 hours.
The concentration of the corrosion inhibitor in the pickling solution is 300mg/L, and the calculated corrosion inhibition efficiency is 96.90%.
Example 3:
the difference from example 2 is that:
the concentration of the corrosion inhibitor in the pickling solution is 50mg/L, and the calculated corrosion inhibition efficiency is 83.39%.
Example 4:
the difference from example 1 is that:
x＝13，y＝87，n＝33。
in the first step, the molar ratio of the ureido pyrimidone-polyether amine compound to the polyethylene glycol diacrylate is 2:1.
In the second step, the reaction temperature is 50 ℃, and the stirring speed is 500r/min.
In the third step, the reduced pressure distillation temperature is 60 ℃, the vacuum drying temperature is 80 ℃ and the time is 2 hours.
The concentration of the corrosion inhibitor in the pickling solution is 500mg/L, and the calculated corrosion inhibition efficiency is 98.80%.
Comparative example:
at normal temperature, 1mol/L HCl solution is used as acid washing liquid, and the exposed area is 1cm 2 The Q235 steel of (1) was used as a metal specimen, and the metal specimen was immersed in the above-mentioned pickling solution for 6 hours, followed by subjecting the metal specimen to an electrochemical polarization curve test (parameters related to the polarization curve were analyzed by tafel extrapolation).
To examine the corrosion inhibition effect of the corrosion inhibitor, the following tests were carried out:
(1) Electrochemical polarization curve test results
FIG. 1 shows the electrochemical polarization curves of comparative examples and examples 1, 2 and 4, from which it can be seen that the cathodic curve and the anodic curve both move towards lower current densities with concentrations of the corrosion inhibitor from 100mg/L to 500mg/L, compared to the case where no corrosion inhibitor is added, indicating that the corrosion inhibitor acts to inhibit both cathodic and anodic corrosion reactions. And the protected point positions of the corrosion inhibitor contacted with the metal surface are increased in response to the increase of the adding concentration of the corrosion inhibitor, and the intuitive expression is that the corrosion current density is gradually reduced, which shows that the corrosion rate is gradually reduced and the corrosion inhibition efficiency is gradually increased.
(2) Corrosion profile testing
The surface of the Q235 steel sample was cleaned and then scanned for surface topography using a scanning electron microscope, the results are shown in fig. 2.
For the comparative example, examples 3 and 4, the metal sample is taken out after the electrochemical polarization curve test, the surface of the metal is dried and then the surface corrosion morphology of the metal is observed by using a scanning electron microscope, and the result is shown in fig. 3-5.
As can be seen by comparison, the surface of the comparative example (no corrosion inhibitor added to the pickling solution) is severely damaged due to strong solution corrosion, and the surface has rough and loose corrosion products; compared with the comparative example, the surface appearance of the example 3 (added with 50mg/L of corrosion inhibitor) has reduced corrosion degree and clearer corrosion appearance; while in example 4 (adding 500mg/L of corrosion inhibitor), smooth metal surface appearance can be seen, even polishing traces can be clearly seen, which shows that the corrosion inhibitor can effectively inhibit the corrosion of the corrosion medium to the metal surface.
Claims (10)
1. A ureido pyrimidone derivative pickling corrosion inhibitor, the method is characterized in that:
the structure of the corrosion inhibitor is shown as a formula I or a formula II:
wherein x + y =100,2 is not less than n and not more than 84.
2. A preparation method of a ureido pyrimidone derivative acid pickling corrosion inhibitor is characterized by comprising the following steps:
the corrosion inhibitor has a structure shown as a formula I in claim 1, and the preparation method comprises the following steps:
and carrying out Michael addition on the ureido pyrimidone-polyether amine compound shown in the formula II and polyethylene glycol diacrylate to obtain the corrosion inhibitor.
3. The method for preparing the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 2, wherein the method comprises the following steps: the molar ratio of the ureido pyrimidone-polyether amine compound to the polyethylene glycol diacrylate is 1-2:1.
4. The method for preparing the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 2, wherein the method comprises the following steps:
the preparation method specifically comprises the following steps: firstly, adding the ureido pyrimidone-polyether amine compound and the polyethylene glycol diacrylate into a solvent according to a certain proportion, then reacting for 12-48 hours at 25-60 ℃ to obtain a reaction product, and then removing the solvent in the reaction product to obtain the viscous faint yellow corrosion inhibitor.
5. The method for preparing the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 4, wherein the method comprises the following steps: the reaction temperature is 25-50 ℃.
6. The method for preparing the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 4, wherein the method comprises the following steps: the solvent is at least one of dichloromethane, tetrahydrofuran and absolute ethyl alcohol.
7. The use of the ureido pyrimidone derivative restrainer of claim 1, wherein: the corrosion inhibitor is applied to the field of metal corrosion prevention.
8. The use of the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 7, wherein the ureido pyrimidone derivative pickling corrosion inhibitor comprises:
the application method comprises the following steps: the corrosion inhibitor is added into the pickling solution of the metal material, and the concentration of the corrosion inhibitor in the pickling solution is 5-600mg/L.
9. The use of the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 8, wherein the ureido pyrimidone derivative pickling corrosion inhibitor comprises: the concentration of the corrosion inhibitor in the pickling solution is 100-500mg/L.
10. The use of the ureido pyrimidone derivative pickling corrosion inhibitor according to claim 8, wherein the ureido pyrimidone derivative pickling corrosion inhibitor comprises: the metal material is carbon steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109666121A (en) * | 2017-10-17 | 2019-04-23 | 翁秋梅 | A kind of hydridization dynamic crosslinking polymer and its application |
| US11149108B1 (en) * | 2018-06-26 | 2021-10-19 | National Technology & Engineering Solutions Of Sandia, Llc | Self-assembly assisted additive manufacturing of thermosets |
| CN114671814A (en) * | 2022-04-11 | 2022-06-28 | 常州大学 | Mercapto pyrimidine derivative quaternary ammonium salt corrosion inhibitor and preparation method and application thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109666121A (en) * | 2017-10-17 | 2019-04-23 | 翁秋梅 | A kind of hydridization dynamic crosslinking polymer and its application |
| US11149108B1 (en) * | 2018-06-26 | 2021-10-19 | National Technology & Engineering Solutions Of Sandia, Llc | Self-assembly assisted additive manufacturing of thermosets |
| CN114671814A (en) * | 2022-04-11 | 2022-06-28 | 常州大学 | Mercapto pyrimidine derivative quaternary ammonium salt corrosion inhibitor and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| WENJING LIU等: "Ureidopyrimidinone-containing Poly(amino ester) for corrosion inhibition of mild steel in acidic medium", MATERIALS CHEMISTRY AND PHYSICS, vol. 292, pages 1 - 10 * |
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