CN112323070B - Green compound corrosion inhibitor containing Schiff base compound and application thereof - Google Patents

Green compound corrosion inhibitor containing Schiff base compound and application thereof Download PDF

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CN112323070B
CN112323070B CN202011304826.9A CN202011304826A CN112323070B CN 112323070 B CN112323070 B CN 112323070B CN 202011304826 A CN202011304826 A CN 202011304826A CN 112323070 B CN112323070 B CN 112323070B
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corrosion inhibitor
schiff base
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corrosion
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CN112323070A (en
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李恩田
梁方舟
赵书诗
齐磊
祝晓杰
周诗岽
吕晓方
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Changzhou University
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    • 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
    • C23F11/10—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 organic inhibitors
    • C23F11/16—Sulfur-containing compounds
    • C23F11/165—Heterocyclic compounds containing sulfur as hetero atom
    • 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
    • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids

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Abstract

The invention provides a green compound corrosion inhibitor containing Schiff base compounds and application thereof, belonging to the technical field of corrosion inhibitors. The corrosion inhibitor comprises a Schiff base-containing corrosion inhibitor, an ionic liquid and an organic solvent. The compound carbon steel pickling corrosion inhibitor is mainly applied to carbon steel pickling, and the synthesized Schiff base-containing compound and the ionic liquid are mutually cooperated to form a compact adsorption layer on the surface of the carbon steel, so that the corrosion inhibition effect of the corrosion inhibitor on the carbon steel is improved, the corrosion rate of metal is reduced, the corrosion degree of pipelines, equipment and the like is weakened, and the economic loss caused by corrosion is reduced; the compound corrosion inhibitor does not contain substances for human bodies and environment, the adopted ionic liquid and the Schiff base compound are both green protection, and the compound corrosion inhibitor is simple to prepare, low in cost, green and environment-friendly and convenient for industrial production.

Description

Green compound corrosion inhibitor containing Schiff base compound and application thereof
Technical Field
The invention belongs to the technical field of industrial corrosion inhibitors, and relates to a green compound corrosion inhibitor and application thereof.
Background
In many industrial operations, corrosion of low carbon steel is a serious problem and for economic purposes the corrosion problem must be solved and durability prioritized. The use of mild steel in many cleaning processes, such as pickling industry, acid descaling, and oil well corrosion, is highly susceptible. The hydrochloric acid is used because of its low cost, convenient use and high efficiency compared with inorganic acid. However, due to the strong corrosiveness of hydrochloric acid, the protection of low carbon steel is indispensable. In order to maintain the commercial value of low carbon steel, which must be reused for industrial applications, complete inhibition of corrosion is not possible; nevertheless, corrosion rates can be slowed by appropriate precautions.
The Schiff base mainly refers to a class of organic compounds containing imine or azomethine characteristic groups (-RC-N) -, and the N atom at the core part of the Schiff base has arc pair electrons and stronger coordination capacity. Currently, schiff base compounds and metal complexes thereof are widely used in the fields of medicine, catalysis, analysis, corrosion, photochromism, and the like. The Schiff base corrosion inhibitor has the advantages of simple synthesis steps, low cost, good corrosion inhibition effect, environmental friendliness and the like, becomes a research hotspot in the corrosion field, is widely applied to the production industry, and achieves remarkable effect. At present, the synthesized schiff base compound, such as a preparation method of a 1, 2-propylene diamine condensed 5-bromosalicylaldehyde bis-schiff base corrosion inhibitor of CN201811035888.7, has a central structure of-C ═ N-, and different groups are introduced by selection of different raw materials, and the groups and-C ═ N-together play an adsorption role, because of the selection condition of the raw materials, the structures are mostly semicarbazones, and the raw materials have certain carcinogenicity and are not beneficial to the requirements of green environmental protection. The common corrosion inhibitor sold on the market has the problems of higher price, large dosage, serious pollution and the like, so that the corrosion inhibition efficiency is ensured, and the development of a novel high-efficiency, green, environment-friendly and economic corrosion inhibitor has higher research value on the premise of low toxicity of the corrosion inhibitor. The invention develops a new Schiff base compound which is more green and environment-friendly and has a short structural formula, explores a better slow-release effect and can find more directions in the aspect of compounding the corrosion inhibitor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a novel Schiff base compound as a corrosion inhibitor, and the novel Schiff base compound is compounded with an ionic liquid to obtain a green compound corrosion inhibitor, and the corrosion inhibitor is efficient, green and environment-friendly, and can effectively slow down the corrosion of carbon steel in a hydrochloric acid medium.
The technical scheme adopted by the invention is that the green compound corrosion inhibitor is prepared by compounding a Schiff base corrosion inhibitor solution and an ionic liquid solution.
Wherein the Schiff base corrosion inhibitor compound is one of 4-bromo-2-thiophene formaldehyde para-aminobenzamide or 5-methyl-2-thiophene formaldehyde para-aminobenzamide;
the 4-bromo-2-thiophenecarboxaldehyde condensed p-aminobenzamide compound is as follows:
Figure BDA0002788027420000021
the 5-methyl-2-thiophenecarboxaldehyde condensed p-aminobenzamide compound is as follows:
Figure BDA0002788027420000022
wherein the ionic liquid is 1-octyl-3-methyl bromo imidazole ionic liquid [ C8min]；
Figure BDA0002788027420000023
The preparation method of the green compound corrosion inhibitor comprises the following steps: adding ionic liquid into a solvent to obtain an ionic liquid solution; adding Schiff base compound into solvent to obtain Schiff base corrosion inhibitor solution, mixing the two solutions together, and stirring at room temperature. The cost and the corrosion inhibition effect are combined, the concentration of the Schiff base corrosion inhibitor in the corrosion inhibitor obtained by compounding is preferably 0.005 mol/L-0.02 mol/L, and the concentration of the ionic liquid is preferably 0.005 mol/L-0.02 mol/L. More preferably, the concentration of the Schiff base corrosion inhibitor in the corrosion inhibitor obtained after compounding is 0.005mol/L, and the concentration of the ionic liquid is 0.005 mol/L.
Further, the solvent used for diluting the Schiff base corrosion inhibitor is ethanol solution, and the solvent used for diluting the ionic liquid is ethanol solution.
The application of the green compound corrosion inhibitor in effectively retarding the corrosion of carbon steel in a hydrochloric acid medium comprises the following specific application steps:
(1) the test selects an X80 carbon steel hanging piece with the size of 3.0cm multiplied by 1.0cm multiplied by 0.3cm, before the test, carbon steel samples are ground by No. 400, No. 800 and No. 1200 metallographic abrasive paper, washed by distilled water, put into absolute ethyl alcohol for ultrasonic oscillation dehydration, dried in vacuum, and sealed by paraffin on a non-working surface.
(2) And (4) opening the constant-temperature water bath kettle, setting the water bath temperature to 298K, and putting the container filled with the corrosion inhibitor into the constant-temperature water bath kettle.
(3) And (3) putting the sample into a corrosion inhibitor, soaking for 20h, taking out, and then putting into a hydrochloric acid solution.
Further, the hydrochloric acid medium is 1mol/L hydrochloric acid solution.
The invention has the beneficial effects that: (1) the ionic liquid harmless to human bodies and the environment is compounded with the Schiff base corrosion inhibitor, so that the harm of the harmful corrosion inhibitor to human bodies and ecology is effectively reduced, and the composite corrosion inhibitor is environment-friendly and green; (2) after the synthesized Schiff base and the ionic liquid are compounded, an adsorption film with good density and larger coverage degree is formed on the surface of the metal, and the Schiff base and the ionic liquid have a synergistic effect; (3) the preparation method is simple, low in cost, green and environment-friendly, and convenient for industrial production.
Drawings
FIG. 1 is a Tafel polarization curve of X80 steel in various corrosion inhibitors to which example 1 relates;
FIG. 2 is a Nyquist plot of X80 steel in various corrosion inhibitors to which example 1 relates;
FIG. 3 is a Tafel polarization curve of X80 steel in various corrosion inhibitors to which example 2 relates;
FIG. 4 is a Nyquist plot of X80 steel in various corrosion inhibitors to which example 2 relates;
FIG. 5 is an infrared spectrum of Schiff base corrosion inhibitor 1 in example 1 of the present invention;
FIG. 6 is an infrared spectrum of Schiff base corrosion inhibitor 2 in inventive example 2.
Detailed Description
Example 1
Firstly, preparing a Schiff base corrosion inhibitor solution 1
Firstly, at room temperature, adding 1.91g of 4-bromo-2-thiophenecarboxaldehyde into 15-20 ml of ethanol to obtain a solution A, and dissolving 1.36g of p-aminobenzamide into a solution B of 10-15 ml of ethanol;
secondly, mixing the A, B solutions in a round-bottom flask, stirring in a water bath at the temperature of 80 ℃, and carrying out condensation reflux reaction for 6 hours; then cooling and standing the mixture in the flask overnight, filtering and separating to obtain a light yellow powdery product, and washing with ethanol to obtain Schiff base corrosion inhibitor 1 (4-bromo-2-thiophenecarboxaldehyde p-aminobenzamide);
thirdly, 0.309g of 4-bromo-2-thiophenecarboxaldehyde p-aminobenzamide corrosion inhibitor is weighed and dissolved in 50mL of ethanol solution to obtain 0.02mol/L of Schiff base corrosion inhibitor solution.
Figure BDA0002788027420000031
The corrosion inhibitor synthesized in the second step is 4000-500 cm-1Scanning within the range, and carrying out infrared spectrum structural characterization. In the attached figure 5, 1750-1700 cm-1Aldehyde group VC＝OThe characteristic peak of (1) disappeared, 3210cm-1And 3345cm-1The symmetric and asymmetric stretching vibrations of the corresponding N-H bond in the amide disappear. And at 1610cm-1V appears atC＝NThe stretching vibration of (2). This shows that carbon-nitrogen double bond is generated, and 4-bromine-2-thiophenecarboxaldehyde p-aminobenzamide corrosion inhibitor is synthesized.
Secondly, preparing ionic liquid solution
0.194g of ionic liquid (1-octyl-3-methylimidazolium bromide) is weighed by an analytical balance and dissolved in 50mL of ethanol solution to obtain an ionic liquid solution with the concentration of 0.02 mol/L.
Figure BDA0002788027420000041
III, Compound 1
The Schiff base corrosion inhibitor solution and the ionic liquid solution are mixed together and stirred uniformly at room temperature, and after compounding, the concentration of the Schiff base corrosion inhibitor is 0.01mol/L, and the concentration of the ionic liquid is 0.01 mol/L.
Four corrosion inhibitor products, namely a Schiff base 1 corrosion inhibitor with the concentration of 0.01mol/L, an ionic liquid with the concentration of 0.01mol/L, a compound 1 (containing 0.01mol/L Schiff base 1 corrosion inhibitor and 0.01mol/L ionic liquid) and a compound 1.1 (containing 0.05mol/L Schiff base 1 corrosion inhibitor and 0.05mol/L ionic liquid), which are prepared in the embodiment 1 are detected and evaluated:
the corrosion inhibition experiment adopts a polarization curve method, X80 carbon steel hanging pieces with the size of 3.0cm multiplied by 1.0cm multiplied by 0.3cm are selected for the experiment, carbon steel samples before the experiment are ground by 400#, 800# and 1200# metallographic abrasive paper, washed by distilled water, put into absolute ethyl alcohol for ultrasonic oscillation dehydration, dried in vacuum, and sealed by paraffin on a non-working surface. The dimensions were measured and the surface area was determined prior to testing. The solvent is selected from 1mol/L prepared hydrochloric acid solution.
In the experiment, an electrochemical workstation is utilized, a traditional three-electrode system is adopted, a platinum wire electrode is used as an auxiliary electrode, saturated calomel is used as a reference electrode, and carbon steel is used as a working electrode to carry out potentiodynamic polarization curve determination. Before measurement, the carbon steel of the working electrode is immersed in the corrosive liquid for 30 minutes, and after the system potential is stable, the potential is the open-circuit potential. The scanning interval is +/-250 m V, the scanning speed is 5.0m V/s, the sensitivity is set as the automatic adjustment sensitivity, and the relevant zeta potential polarization curve parameters are obtained. The corrosion inhibition rate eta is calculated according to the following formula:
in the formula i0 corrAnd icorrThe corrosion current density of the working electrode in the blank solution and the corrosion current density of the working electrode in the solution after the corrosion inhibitor is added are respectively.
The evaluation results of example 1 are shown in table 1, fig. 1, and fig. 2.
Table 1 evaluation of corrosion inhibitor of example 1 under normal temperature and pressure conditions
Figure BDA0002788027420000042
Figure BDA0002788027420000051
As can be seen from Table 1, the corrosion inhibition effect of the compound 1.1 and the compound 1 is better than that of the single compound [ C8min ] and the Schiff base 1, and especially the compound 1.1 has more remarkable corrosion inhibition effect under the condition of the same concentration of corrosion inhibition components.
Example 2
Firstly, preparing a Schiff base corrosion inhibitor solution 2
Firstly, at room temperature, adding 1.26g of 5-methyl-2-thiophenecarboxaldehyde into 15-20 ml of ethanol to obtain a solution A, and dissolving 1.36g of p-aminobenzamide into a solution B of 10-15 ml of ethanol; secondly, mixing the A, B solutions in a round-bottom flask, stirring in a water bath at the temperature of 80 ℃, and carrying out condensation reflux reaction for 6 hours; then cooling and standing the mixture in the flask overnight, filtering and separating to obtain a light yellow powdery product, and washing with ethanol to obtain Schiff base corrosion inhibitor 2 (5-methyl-2-thiophenecarboxaldehyde p-aminobenzamide); and thirdly, weighing 0.244g of 5-methyl-2-thiophene formaldehyde p-aminobenzamide corrosion inhibitor, and dissolving the 5-methyl-2-thiophene formaldehyde p-aminobenzamide corrosion inhibitor in 50mL of ethanol solution to obtain 0.02mol/L Schiff base corrosion inhibitor solution.
Figure BDA0002788027420000052
For the synthesized corrosion inhibitor, the thickness is 4000-500 cm-1Scanning within the range, and carrying out infrared spectrum structural characterization. In the attached figure 6, aldehyde groups V are 1750-1700 cm < -1 >C＝OThe characteristic peaks of (A) disappear, and the symmetric and asymmetric stretching vibrations of the N-H bond in the corresponding amide at 3210cm-1 and 3345cm-1 disappear. And V appears at 1650cm-1C＝NThe stretching vibration of (2). This shows that carbon-nitrogen double bond is generated, i.e. 5-methyl-2-thiophenecarboxaldehyde condensed p-aminobenzamide corrosion inhibitor is synthesized.
Secondly, preparing ionic liquid solution
0.194g of 1-octyl-3-methyl bromo imidazole ionic liquid is weighed by an analytical balance and dissolved in 50mL of ethanol solution to obtain an ionic liquid solution with the concentration of 0.02 mol/L.
Figure BDA0002788027420000061
III, Compound 2
The two solutions are mixed together and stirred uniformly at room temperature, and after compounding, the concentration of the Schiff base corrosion inhibitor is 0.01mol/L, and the concentration of the ionic liquid is 0.01 mol/L.
Four corrosion inhibitor products, namely the Schiff base 2 corrosion inhibitor with the concentration of 0.01mol/L, the ionic liquid with the concentration of 0.01mol/L, the compound 2 (containing 0.01mol/L Schiff base 2 corrosion inhibitor and 0.01mol/L ionic liquid) and the compound 2.1 (containing 0.05mol/L Schiff base 2 corrosion inhibitor and 0.05mol/L ionic liquid), prepared in the example 2 are detected and evaluated, and the detection method is the same as that in the example 1.
The evaluation results of example 2 are shown in table 2, fig. 3, and fig. 4.
Table 2 evaluation of corrosion inhibitor of example 2 under normal temperature and pressure conditions
Figure BDA0002788027420000062
When the above examples 1 and 2 are observed, the following results can be obtained: before adding corrosion inhibitor, the corrosion current density is 20.41 multiplied by 10- 5A·cm-2(ii) a After different corrosion inhibitors are added, the polarization curve moves downwards to different degrees, the corrosion current is obviously reduced, and the radius of the capacitive arc resistance in the impedance curve is obviously increased, which shows that the addition of the corrosion inhibitor plays a certain role in hindering the corrosion of the X80 steel. Specifically, when the ionic liquid is added, the corrosion current density is 4.87 multiplied by 10-5A·cm-2(ii) a When the Schiff base corrosion inhibitor 1 is added, the corrosion current density is 3.15 multiplied by 10-5A·cm-2(ii) a When the compound corrosion inhibitor 1 is added, the corrosion current density is 3.05 multiplied by 10-5A·cm-2(ii) a When the compound corrosion inhibitor is added for 1.1, the corrosion current density is 1.80 multiplied by 10-5A·cm-2When Schiff base corrosion inhibitor 2 is added, the corrosion current density is 4.86 multiplied by 10-5A·cm-2(ii) a When the compound corrosion inhibitor 2 is added, the corrosion current density is 3.21 multiplied by 10-5A·cm-2(ii) a When the compound corrosion inhibitor is added for 2.2, the corrosion current density is 1.95 multiplied by 10-5A·cm-2(ii) a The compound corrosion inhibitor can effectively slow down the corrosion of chloride ions to X80.
Example 3
Respectively preparing 0.015mol/L Schiff base 1 corrosion inhibitor solution; 0.015mol/L of ionic liquid [ C8min](ii) a Compound 1(0.015mol/L Schiff base 1+0.015mol/L [ C8 min)]) (ii) a Compounded with 1.3(0.0075mol/L Schiff base 1+0.0075mol/L [ C8 min)]) The preparation method is the same as that of example 1.
The evaluation results of example 3 are shown in Table 3
Table 3 shows the corrosion inhibitors evaluated under normal temperature and pressure conditions in example 3
Figure BDA0002788027420000071
Example 4
Respectively preparing 0.015mol/L Schiff base 2 corrosion inhibitor solution; 0.015mol/L of ionic liquid [ C8min](ii) a Compound 2(0.015mol/L Schiff base 2+0.015mol/L [ C8 min)]) (ii) a Compounded with 2.4(0.0075mol/L Schiff base 2+0.0075mol/L [ C8 min)]) The preparation method is the same as that of example 2.
The evaluation results of example 4 are shown in table 4:
table 4 shows the evaluation of the corrosion inhibitor of example 4 under normal temperature and pressure conditions
Figure BDA0002788027420000072
Figure BDA0002788027420000081
In conclusion, after the synthesized 4-bromo-2-thiophene formaldehyde-condensed p-aminobenzamide corrosion inhibitor or 5-methyl-2-thiophene formaldehyde-condensed p-aminobenzamide Schiff base is compounded with the ionic liquid in a specific ratio, the corrosion inhibitor with larger molecules is adsorbed on the surface of X80 to form a layer of protective film, but gaps exist among the molecules; at the moment, the ionic liquid with smaller molecules is adsorbed in the uncovered gaps, so that the protective film is more compact, the corrosion can be better reduced, the synergistic effect can be achieved between the ionic liquid and the protective film, the corrosion of the X80 steel in a hydrochloric acid medium can be effectively slowed down, and the compound corrosion inhibitor is green, environment-friendly, safe and harmless.
Comparative example 1
Comparative example 1 compared to example 1, other schiff bases with similar structures were synthesized:
firstly, at room temperature, adding 1.12g of 2-thiophenecarboxaldehyde into 15-20 ml of ethanol to obtain a solution A, and dissolving 1.38g of p-nitroaniline into a solution B of 10-15 ml of ethanol; secondly, mixing the A, B solutions in a round-bottom flask, stirring in a water bath at the temperature of 80 ℃, and carrying out condensation reflux reaction for 6 hours; then cooling and standing the mixture in the flask overnight, filtering and separating to obtain a brown yellow powdery product, and washing with ethanol to obtain the Schiff base corrosion inhibitor; thirdly, 0.232g of 2-thiophenecarboxaldehyde p-nitroaniline corrosion inhibitor is weighed and dissolved in 50mL of ethanol solution to obtain 0.02mol/L Schiff base corrosion inhibitor solution.
Figure BDA0002788027420000082
Firstly, dissolving the synthesized Schiff base compound in 50mL of ethanol solution to obtain 0.02mol/L Schiff base corrosion inhibitor solution, and preparing Schiff base corrosion inhibitor solution 3;
secondly, preparing ionic liquid solution
0.194g of 1-octyl-3-methyl bromo imidazole ionic liquid is weighed by an analytical balance and dissolved in 50mL of ethanol solution to obtain an ionic liquid solution with the concentration of 0.02 mol/L.
Figure BDA0002788027420000091
III, Compound 3
And mixing the two solutions together, and uniformly stirring at room temperature, wherein after compounding, the concentration of the Schiff base corrosion inhibitor is 0.01mol/L, and the concentration of the ionic liquid is 0.01 mol/L.
The evaluation results of comparative example 1 are shown in Table 5
Table 5 shows the evaluation of the corrosion inhibitor of comparative example 1 under normal temperature and pressure conditions
Figure BDA0002788027420000092
Comparative example 1 synthesized schiff base of similar structure, but the schiff base had substantially no effect on corrosion inhibition and even promoted corrosion.
Comparative example 2
Respectively preparing 0.005mol/L Schiff base 1 corrosion inhibitor solution;0.005mol/L Ionic liquid [ C ]8min](ii) a 0.005mol/L compound solution (containing 0.0025[ C8 min)]+0.0025 schiff base 1). The preparation method is the same as that of example 1.
The evaluation results of comparative example 2 are shown in Table 6 (the same test methods as in example 1)
Table 6 shows the evaluation of the corrosion inhibitor of comparative example 2 under normal temperature and pressure conditions
Figure BDA0002788027420000093
Figure BDA0002788027420000101
As can be seen from comparative example 2, when the concentrations of the Schiff base corrosion inhibitor and the ionic liquid in the corrosion inhibitor obtained after the compounding are lower than 0.0025mol/L, the corrosion inhibition effect is slightly reduced.
Comparative example 3
Respectively preparing 0.005mol/L Schiff base 2 corrosion inhibitor solution; 0.005mol/L Ionic liquid [ C ]8min](ii) a 0.005mol/L compound solution (containing 0.0025[ C8 min)]+0.0025 schiff base 2). The preparation method is the same as that of example 2.
The evaluation results of comparative example 3 are shown in table 7; (detection method same as in example 1)
Table 7 shows the evaluation of the corrosion inhibitor of comparative example 3 under normal temperature and pressure conditions
Figure BDA0002788027420000102

Claims (4)

1. A green compound corrosion inhibitor containing Schiff base compounds is characterized in that: the green compound corrosion inhibitor is prepared by respectively diluting a Schiff base compound and an ionic liquid by a solvent and then compounding; the concentration of the Schiff base corrosion inhibitor in the corrosion inhibitor obtained after compounding is 0.005 mol/L-0.02 mol/L, and the concentration of the ionic liquid is 0.005 mol/L-0.02 mol/L;
the Schiff base compound is a 4-bromo-2-thiophene formaldehyde p-aminobenzamide corrosion inhibitor or 5-methyl-2-thiophene formaldehyde p-aminobenzamide, and the specific compound structural formula is as follows:
Figure FDA0003286025710000011
the ionic liquid is 1-octyl-3-methyl bromo imidazole ionic liquid [ C8min]。
2. The green compound corrosion inhibitor containing Schiff base compounds according to claim 1, which is characterized in that: the solvent is ethanol.
3. The green compound corrosion inhibitor containing Schiff base compounds according to claim 1, which is characterized in that: the concentration of the Schiff base corrosion inhibitor in the corrosion inhibitor obtained after compounding is 0.005mol/L, and the concentration of the ionic liquid is 0.005 mol/L.
4. The use of the green compound corrosion inhibitor containing the schiff base compound according to any one of claims 1 to 3, wherein: the green compound corrosion inhibitor is applied to retarding the corrosion of carbon steel in a hydrochloric acid medium.
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