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Metal acid pickling corrosion inhibitor as well as preparation method and application thereof

A technology of pickling corrosion inhibitor and corrosion inhibitor, which is applied in the field of metal pickling corrosion and protection, can solve the problems of large influence of acidity of pickling solution and low corrosion inhibition efficiency.

Active Publication Date: 2015-05-20
四川维克达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a corrosion inhibitor for metal pickling, its preparation method and application, which has good The metal corrosion inhibition effect is simple, the preparation method is simple, and the production conditions are mild. It is applied to the pickling solution, which has the advantages of good compatibility with the pickling medium, excellent corrosion inhibition effect, and little influence by the acidity of the pickling solution. Application in industry

Method used

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  • Metal acid pickling corrosion inhibitor as well as preparation method and application thereof
  • Metal acid pickling corrosion inhibitor as well as preparation method and application thereof
  • Metal acid pickling corrosion inhibitor as well as preparation method and application thereof

Examples

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preparation example Construction

[0042] The preparation process of the pickling corrosion inhibitor is as follows.

[0043] Add 1.72g of L-cysteine ​​methyl ester hydrochloride, 20-30mL of dichloromethane and 1.4mL of triethylamine in sequence to a 100mL three-necked flask, stir at room temperature for 10-15min, then dropwise add 2.2g of di-tert-dicarbonate Butyl ester (its structural formula is (Boc) 2 0), after the dropwise addition, continue to stir at room temperature for 30-40min, add 20-25mL water to the mixed solution, separate the liquids, wash the organic phase with water, dry over anhydrous magnesium sulfate, and rotary evaporate the solvent dichloromethane to obtain the Boc protected amino group L-cysteine ​​methyl ester Me 3 COOCNHCH(COOMe)CH 2 SH.

[0044] In a 100mL round bottom flask, add 2.37g Me 3 COOCNHCH(COOMe)CH 2 SH, 2.64g nickel complex Ni(dppe)Cl 2 , 30-40mL tetrahydrofuran, 1.4mL triethylamine. After stirring and reacting at room temperature for 1-1.2h, the reaction solvent was ...

Embodiment 1

[0045] Example 1 This example is the influence of different concentrations of pickling corrosion inhibitors of the present invention on the corrosion inhibition rate of HCl pickling solution

[0046] In order to investigate the relationship between the concentration of the pickling corrosion inhibitor of the present invention and the corrosion inhibition rate of the HCl pickling solution, in this embodiment, the pickling corrosion inhibitor is added under the same HCl concentration (1mol / L, molar concentration, the same below). , so that the concentration of pickling corrosion inhibitor is 20-160mg / L. Under the temperature condition of 30 ℃, it was used for pickling of Q235 steel, and the corrosion inhibition rate of various pickling solutions was measured. The results are shown in Table 1. And take the concentration C (mg / L) of the pickling corrosion inhibitor as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, obtain the concentration of the pickling c...

Embodiment 2

[0050] Embodiment 2 This embodiment is the effect of action time on the corrosion inhibition rate of HCl pickling solution

[0051] In order to investigate the relationship between the action time and the corrosion inhibition rate of the HCl pickling solution, in this example, the pickling corrosion inhibitor prepared above was added to the same concentration of HCl solution (1mol / L) at the same concentration (80mg / L). Under the conditions of 30°C temperature and different action time, it was used for pickling of Q235 steel, and the corrosion inhibition rate of the pickling solution was measured at different times. The results are shown in Table 2. And take time (t) as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, to obtain the relationship diagram between time and corrosion inhibition rate, as figure 2 shown.

[0052] Table 2 Effect of time on corrosion inhibition rate of HCl pickling solution

[0053] time (t, h)

[0054] According to t...

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Abstract

The invention discloses a metal acid pickling corrosion inhibitor as well as a preparation method and an application thereof, aims to solve problems that a conventional corrosion inhibitor is low in corrosion inhibition efficiency and is seriously influenced by acidity of an acid pickling solution, and provides a type, a preparation method and an application of the metal corrosion inhibitor. The metal corrosion inhibitor has a good metal corrosion inhibition effect, the preparation method is simple, the production condition is mild, and the metal corrosion inhibitor has the advantages of good compatibility with an acid pickling medium, excellent corrosion inhibition effect and low possibility of being influenced by acidity of the acid pickling solution when applied to the acid pickling solution, so that the metal corrosion inhibitor is suitable for industrial popularization and application. With the adoption of the metal acid pickling corrosion inhibitor as well as the preparation method and the application thereof, the metal corrosion is effectively reduced, and the economic loss caused by metal corrosion is reduced.

Description

technical field [0001] The invention relates to the field of metal pickling corrosion and protection, in particular to a metal pickling corrosion inhibitor, its preparation method and application, specifically a kind of L-cysteine ​​methyl ester and 1,2-bis(diphenyl Nickel complexes of phosphino)ethane ligands [(Me 3 COOCNHCH(COOMe)CH 2 S) 2 Ni(dppe)], its preparation method and its application in metal pickling corrosion inhibitor. Background technique [0002] As we all know, corrosion is an important destructive factor in modern industry and life, among which metal corrosion causes the most serious losses to modern industry and life. According to the research report of the US Federal Highway Administration in 2002, in 1998, the direct economic loss caused by metal corrosion in the US industry reached 276 billion US dollars, accounting for about 3.2% of the US GDP that year. At present, the economic loss caused by corrosion in the world is about 700 billion US dollars ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
Inventor 李玉龙谢斌邹立科朱莎莎林肖
Owner 四川维克达环保科技有限公司
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