CN107964658B - Corrosion inhibitor for copper and metal products thereof, and preparation method and application thereof - Google Patents
Corrosion inhibitor for copper and metal products thereof, and preparation method and application thereof Download PDFInfo
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- CN107964658B CN107964658B CN201711307427.6A CN201711307427A CN107964658B CN 107964658 B CN107964658 B CN 107964658B CN 201711307427 A CN201711307427 A CN 201711307427A CN 107964658 B CN107964658 B CN 107964658B
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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
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a corrosion inhibition active ingredient for copper and a metal product thereof, and the active ingredient is 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone. The invention also provides a method for preparing the active component and a corrosion inhibitor prepared by using the active component. The invention also provides the application of the corrosion inhibitor in corrosion prevention and inhibition of copper and metal products thereof in seawater or sodium chloride medium. The corrosion inhibitor provided by the invention has the advantages of low toxicity, environmental protection, high efficiency, small dosage, strong applicability and good durability.
Description
Technical Field
The invention belongs to the field of corrosion inhibition of copper and products thereof, and particularly relates to a corrosion inhibitor for copper and metal products thereof, and a preparation method and application thereof.
Background
With the continuous consumption of various resources on land, the development and utilization of ocean resources become a necessary way to solve the current resource exhaustion problem. However, seawater belongs to strong electrolyte solution, has strong corrosivity to metals, and greatly limits the development and utilization of ocean resources. Therefore, the development and utilization values of marine resources can be really embodied only by solving the corrosion problem of metal materials in seawater.
Copper has excellent mechanical strength, workability, conductivity, weldability and the like, and has been widely used in the fields of industry, military, civil use and the like for a long time. However, although copper has poor activity after being discharged from hydrogen in a metal activity order table, copper is extremely easy to be damaged by corrosion to different degrees in a system containing chloride ions, sulfate, nitrate and other corrosion media, so that the original various properties of the copper are lost, and even a great disaster is caused.
At present, although the seawater corrosion inhibitor of metallic copper has been reported in many documents, the amount of the corrosion inhibitor which can be applied to the actual production is extremely rare.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide a corrosion inhibition active ingredient for copper and a metal product thereof, wherein the active ingredient is 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, and the chemical structural formula of the corrosion inhibition active ingredient is shown as the formula < I >:
it is another object of the present invention to provide a corrosion inhibitor comprising the above active ingredient, which also includes a solvent. Those skilled in the art will recognize that any solvent that is effective to dissolve the active ingredient may be used in the present invention. Preferably, the solvent is dimethyl sulfoxide.
It is another object of the present invention to provide a method for preparing the above active ingredient, the method comprising the steps of:
benzaldehyde, acetophenone and urea are used as raw materials, stannic chloride pentahydrate is used as a catalyst, yellow liquid is generated through reaction, the yellow liquid is filtered, dried, a crude product is recrystallized by absolute ethyl alcohol, and vacuum drying is carried out to obtain 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone.
Specifically, the method comprises the following steps:
benzaldehyde, acetophenone and urea were taken and placed in a beaker (the molar ratio of benzaldehyde, acetophenone and urea was 2. And standing and cooling after the reaction is finished, recrystallizing by using absolute ethyl alcohol, and drying in vacuum to obtain a yellow solid substance, namely the product. The reaction process is shown as the formula < II >:
the invention also aims to provide the application of the active ingredients or the corrosion inhibitor in corrosion prevention and inhibition of copper and metal products thereof in seawater or sodium chloride medium.
Specifically, when in actual use, the active ingredients are fully dissolved in dimethyl sulfoxide to prepare the corrosion inhibitor, and the addition amount of the corrosion inhibitor is 12.45-1245 mg in each liter of seawater or sodium chloride medium. In the sodium chloride medium, the weight percentage of sodium chloride is 0.1-5%.
The invention has the beneficial effects that:
1. compared with the currently commonly used inorganic copper corrosion inhibitor and the traditional organic copper corrosion inhibitor, the corrosion inhibitor can be naturally degraded into nontoxic or low-toxicity substances in the sun, does not bring load to the environment, and accords with the development trend of green corrosion inhibitors.
2. The applicability is strong. The corrosion inhibitor has wide application range, has excellent corrosion inhibition performance under different salinity, and has the corrosion inhibition efficiency of 81 to 91 percent.
3. The corrosion inhibitor has high efficiency, and can effectively inhibit the damage of metal copper in a corrosion medium by adding a small amount of the corrosion inhibitor.
4. The corrosion inhibitor has excellent durability and can keep higher corrosion inhibition performance for a long time.
5. The effective component of the corrosion inhibitor is 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, and the synthetic raw materials are simple and easy to obtain, low in price and convenient to purchase.
Detailed Description
The present invention is described in detail below by way of examples, and it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Example 1
The experimental material is copper, the effective rust inhibitor comprises 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the medium is 3.5% sodium chloride solution, the dosage is 100mL, the effective concentration of added pyrimidine is 0.05mmol/L, and the temperature is 25 ℃.
The corrosion inhibitor is: dissolving a compound of the formula I in a proper amount of dimethyl sulfoxide, then performing ultrasonic dispersion on the mixed solution for 20 minutes at room temperature to completely dissolve the mixed solution, and performing constant volume by using a medium 3.5% sodium chloride solution until the effective concentration of pyrimidine is 0.05mmol/L;
the corrosion inhibition efficiency obtained by experimental tests is respectively as follows: electrochemical impedance spectrum is 81.8%, and electrokinetic potential polarization is 93.5%, which shows that the corrosion inhibitor has low dosage and high efficiency.
Example 2
The experimental material is copper, the effective rust inhibitor comprises 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the medium is 3.5% sodium chloride solution, the dosage is 100mL, the effective concentration of added pyrimidine is 0.1mmol/L, and the temperature is 25 ℃.
The corrosion inhibitor is: dissolving a compound of the formula in a proper amount of dimethyl sulfoxide, then carrying out ultrasonic dispersion on the mixed solution for 20 minutes at room temperature to completely dissolve the compound, and using a medium 3.5% sodium chloride solution to fix the volume until the effective concentration of the pyrimidine is 0.1mmol/L;
the corrosion inhibition efficiency obtained by experimental tests is respectively as follows: the electrochemical impedance spectrum is 90.7%, the potentiodynamic polarization is 91.9%, and the electrochemical impedance spectrum is shown as a corrosion inhibitor with low dosage and high efficiency.
Example 3
The experimental material is copper, the effective rust inhibitor comprises 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the medium is 3.5% sodium chloride solution, the dosage is 100mL, the effective concentration of added pyrimidine is 0.5mmol/L, and the temperature is 25 ℃.
The corrosion inhibitor is: dissolving a compound of the formula in a proper amount of dimethyl sulfoxide, then carrying out ultrasonic dispersion on the mixed solution for 20 minutes at room temperature to completely dissolve the compound, and using a medium 3.5% sodium chloride solution to fix the volume until the effective concentration of the pyrimidine is 0.5mmol/L;
the corrosion inhibition efficiency obtained by experimental tests is respectively as follows: the electrochemical impedance spectrum is 85.5 percent, the potentiodynamic polarization is 92.8 percent, and the electrochemical impedance spectrum is shown as a corrosion inhibitor with low dosage and high efficiency.
Example 4
The experimental material is copper, the effective rust inhibitor comprises 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the medium is 3.5% sodium chloride solution, the dosage is 100mL, the effective concentration of added pyrimidine is 1mmol/L, and the temperature is 25 ℃.
The corrosion inhibitor is: dissolving a compound of the formula I in a proper amount of dimethyl sulfoxide, then performing ultrasonic dispersion on the mixed solution for 20 minutes at room temperature to completely dissolve the mixed solution, and performing constant volume by using a medium 3.5% sodium chloride solution until the effective concentration of pyrimidine is 1mmol/L;
the corrosion inhibition efficiency obtained by experimental tests is respectively as follows: the electrochemical impedance spectrum is 87.2 percent, the potentiodynamic polarization is 89.6 percent, and the electrochemical impedance spectrum is shown as a corrosion inhibitor with low dosage and high efficiency.
Example 5
The experimental material is copper, the effective rust inhibitor comprises 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the medium is 3.5% sodium chloride solution, the dosage is 100mL, the effective concentration of the added pyrimidine is 5mmol/L, and the temperature is 25 ℃.
The corrosion inhibitor is: dissolving a compound of the formula in a proper amount of dimethyl sulfoxide, then carrying out ultrasonic dispersion on the mixed solution for 20 minutes at room temperature to completely dissolve the compound, and using a medium 3.5% sodium chloride solution to fix the volume to 5mmol/L of the effective concentration of the pyrimidine;
the corrosion inhibition efficiency obtained by experimental tests is respectively as follows: the electrochemical impedance spectrum is 86.6 percent, the electrokinetic potential polarization is 90.0 percent, and the electrochemical impedance spectrum is shown as a corrosion inhibitor with low dosage and high efficiency.
Claims (2)
1. The corrosion inhibitor comprises an active ingredient and a solvent, wherein the active ingredient is 4,6-diphenyl-3,4-dihydropyrimidine-2 (1H) ketone, the chemical structural formula of the corrosion inhibitor is shown as the formula < I >, and the solvent comprises dimethyl sulfoxide; the corrosion inhibitor is characterized in that the corrosion inhibitor is used for corrosion prevention and corrosion inhibition of copper and metal products thereof in seawater or sodium chloride medium; when the corrosion inhibitor is used, the addition amount of the corrosion inhibitor is 0.05 mmol-0.1 mmol in each liter of seawater or sodium chloride medium;
2. use according to claim 1, characterized in that the sodium chloride medium contains 0.1 to 5% by weight of sodium chloride.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711307427.6A CN107964658B (en) | 2017-12-11 | 2017-12-11 | Corrosion inhibitor for copper and metal products thereof, and preparation method and application thereof |
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| CN201711307427.6A CN107964658B (en) | 2017-12-11 | 2017-12-11 | Corrosion inhibitor for copper and metal products thereof, and preparation method and application thereof |
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| CN107964658B true CN107964658B (en) | 2022-12-02 |
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| CN110129803B (en) * | 2019-04-12 | 2020-05-19 | 华中科技大学 | Copper corrosion inhibitor based on metal organic framework materials MOFs and preparation method thereof |
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Non-Patent Citations (1)
| Title |
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| Green Biginelli-type Reaction: Solvent-free Synthesis of 5-unsubstituted;Min Wang，etl;《J. Heterocyclic Chem》;20141104;第52卷(第6期);第1907-1910页 * |
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