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Application of pyrazoline derivatives as metal pickling corrosion inhibitor

A derivative, pyrazoline technology, applied in the application field of pyrazoline derivatives and metal pickling corrosion inhibitors, can solve the problems of poor water solubility, lack of pickling solution, effective dispersion and corrosion inhibition efficiency, etc.

Active Publication Date: 2014-11-05
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the above technical problems, the present invention provides a class of pyrazoline derivatives and their preparation methods and their application as corrosion inhibitors for metal pickling. At present, the problem of the serious shortage of pickling solutions that can meet this requirement has been raised, so that the prepared metal pickling solution has good metal corrosion inhibition; it has good water solubility in dilute acids, and can overcome general pyrazoline derivatives. Poor water solubility, inability to effectively disperse in the pickling liquid under pickling conditions, resulting in low corrosion inhibition efficiency, can be used as a new type of high-efficiency, low-cost, low-toxicity, and odorless pickling corrosion inhibitor. Pyrazoline derivatives open up new application fields

Method used

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  • Application of pyrazoline derivatives as metal pickling corrosion inhibitor
  • Application of pyrazoline derivatives as metal pickling corrosion inhibitor
  • Application of pyrazoline derivatives as metal pickling corrosion inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This example uses the polarization curve method to test the influence of different concentrations of 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-1H-pyrazoline on the corrosion inhibition rate of hydrochloric acid pickling solution

[0039] In order to investigate the relationship between the concentration of 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-1H-pyrazoline and the corrosion inhibition rate of hydrochloric acid pickling solution, the present embodiment is identical in hydrochloric acid concentration ( 1 mol / L, molar concentration, the same below), add 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-1H-pyrazoline to make the concentration 20 -160 mg / L, under the temperature condition of 30 ℃, it was used for pickling of Q235 steel respectively, and the corrosion inhibition rate of each pickling solution was measured. The results are shown in Table 1 below.

[0040] Table 1. The effect of the concentration of 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-...

Embodiment 2

[0044] This example uses the weight loss method to investigate the influence of temperature on the corrosion inhibition rate of hydrochloric acid pickling solution

[0045] In order to investigate the relationship between the temperature and the corrosion inhibition rate of the pickling solution, the present embodiment uses 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-1H-pyrazoline at the same concentration (80 mg / L) was added to the same concentration of HCl solution (1 mol / L), under different temperature conditions (see Table 2 below), it was used for pickling of Q235 steel respectively, and the corrosion inhibition of pickling solution at different temperatures was measured The results are shown in Table 2 below.

[0046] Table 2. Effect of temperature on corrosion inhibition rate of hydrochloric acid pickling solution

[0047]

[0048] According to the above results, the corrosion inhibition rate of the hydrochloric acid pickling solution does not change much when...

Embodiment 3

[0050] This example uses the weight loss method to investigate the influence of different acid concentrations on the corrosion inhibition rate of hydrochloric acid pickling solution

[0051] In order to investigate the relationship between the acid concentration and the corrosion inhibition rate of the pickling solution, this embodiment uses 3-phenyl-5-(p-dimethylaminophenyl)-4,5-dihydro-1H-pyrazoline at the same concentration ( 80 mg / L) was added to different concentrations of HCl solutions (see Table 3 below), and were used for pickling of Q235 steel at 30°C, and the corrosion inhibition rate of each pickling solution was measured. The results are shown in the following table 3 shown

[0052] Table 3. Effect of acid concentration on corrosion inhibition rate of hydrochloric acid pickling solution

[0053]

[0054] According to the above results, in the range of hydrochloric acid concentration of 1-4 mol / L, the corrosion inhibition rate of the hydrochloric acid pickling s...

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Abstract

The invention relates to the technical field of metal pickling corrosion and protection, and especially relates to an application of a type of pyrazoline derivatives as a metal pickling corrosion inhibitor. The pyrazoline derivatives have a molecular structure as the following, wherein R1 is N-substituted amino or alkyl comprising N-substituted amino; R2 is N-substituted amino, alkyl comprising N-substituted amino or methoxy; and R3 is H, alkyl, aryl or substituted aryl. According to the invention, the pyrazoline derivative is added as a pickling corrosion inhibitor into pickling media with different concentrations, such that an obtained concentration is 60-120mg / L, and an effective metal corrosion inhibition effect can be obtained.

Description

technical field [0001] The invention belongs to the technical field of metal pickling corrosion and protection, in particular to a class of pyrazoline derivatives and their application as metal pickling corrosion inhibitors. [0002] Background technique [0003] The problem of metal corrosion has already spread to all sectors of the national economy and national defense construction. It is estimated that the annual production of iron and steel equipment scrapped due to corrosion is about 1 / 3 of the world's annual output. For example, in the process of chemical pickling of metal equipment and components, the pickling liquid will also corrode the metal substrate and cause hydrogen embrittlement corrosion of metal equipment while dissolving metal oxides, resulting in a huge waste of metal resources. Adding corrosion inhibitors to protect metal materials and equipment is a method with simple process, low cost and strong applicability. The corrosion inhibitors used in chemical...

Claims

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Application Information

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IPC IPC(8): C07D231/06C23G1/06
CPCC07D231/06C23G1/06
Inventor 邹立科李玉龙谢斌朱莎莎
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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