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Method for improving corrosion inhibition efficiency of imidazole to aluminum and aluminum alloy

An aluminum alloy and imidazole technology, which is applied in the field of improving the corrosion inhibition efficiency of imidazole on aluminum and aluminum alloys, and can solve the problems of harmful environment, low corrosion inhibition efficiency, and high price

Inactive Publication Date: 2014-02-05
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with its derivatives, the corrosion inhibition efficiency of imidazole is generally lower, thus limiting its use to a certain extent
Although the corrosion inhibition efficiency of its derivatives is generally high, the price is relatively expensive, and substances harmful to the environment are easily produced during the synthesis process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Nine samples of pure aluminum with a size of 30 mm×20 mm×2 mm were sanded, washed with acetone and distilled water, dried and weighed, and placed in triplicate in 0.5 mol / L H at 15 °C. 2 SO 4 solution, 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole solution and 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole + 10 -5 mol / L 2-phenyl-2-imidazoline solution after 20 h, take it out, weigh it, and calculate its average corrosion inhibition efficiency. The results show that when the temperature is 15 ℃, at 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole solution, add 10 -5 mol / L 2-phenyl-2-imidazoline can increase the corrosion inhibition efficiency of imidazole to pure aluminum from 60.2% to 82.4%.

Embodiment 2

[0008] Nine samples of pure aluminum with a size of 30 mm×20 mm×2 mm were sanded, washed with acetone and distilled water, dried and weighed, and placed in triplicate in 0.5 mol / L H at 15 °C. 2 SO 4 solution, 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole solution and 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole + 0.01 mol / L 2-phenyl-2-imidazoline solution for 20 h, then take it out, weigh it, and calculate its average corrosion inhibition efficiency. The results show that when the temperature is 15 ℃, at 0.5 mol / L H 2 SO 4 + 10 -4 Adding 0.01 mol / L 2-phenyl-2-imidazoline to the mol / L imidazole solution can increase the corrosion inhibition efficiency of imidazole on pure aluminum from 60.2 % to 96.9 %.

Embodiment 3

[0010] Nine samples of pure aluminum with a size of 30 mm×20 mm×2 mm were sanded, washed with acetone and distilled water, dried and weighed, and placed in triplicate in 0.5 mol / L H at 15 °C. 2 SO 4 solution, 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole solution and 0.5 mol / L H 2 SO 4 + 10 -4 mol / L imidazole + 1 mol / L 2-phenyl-2-imidazoline solution for 20 h, then take it out, weigh it, and calculate its average corrosion inhibition efficiency. The results show that when the temperature is 15 ℃, at 0.5 mol / L H 2 SO 4 + 10 -4 Adding 1 mol / L 2-phenyl-2-imidazoline to the mol / L imidazole solution can increase the corrosion inhibition efficiency of imidazole on pure aluminum from 60.2 % to 97.8 %.

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Abstract

The invention discloses a method for improving corrosion inhibition efficiency of imidazole to aluminum and aluminum alloy, which is a method for obviously improving the corrosion inhibition efficiency of imidazole by adding 2-phenyl-2-imidazoline in the imidazole. The method comprises a formula of the corrosion inhibitor and related process conditions, the aluminum and aluminum alloy comprise pure aluminum and aluminum alloys in various types, wherein the formula of corrosion inhibitor is 10<-4> to 10<-5> mol / L of imidazole, the concentration of 2-phenyl-2-imidazoline is 10<-5> to 1 mol / L, the corrosion (corrosion inhibition) time is 0-100h, and the corrosion temperature is 0-100 DEG C. The corrosion medium comprises acid, alkali, neutral and organic solution media. Under different parameter conditions, the imidazole corrosion inhibition efficiency can be improved by about two dozens of percentage point after adding the 2-phenyl-2-imidazoline, so that the effect is obvious. The method is convenient to use, low in cost and simple to operate.

Description

technical field [0001] The invention relates to a method for inhibiting metal corrosion, in particular to a method for improving the corrosion inhibition efficiency of imidazole on aluminum and aluminum alloys. Background technique [0002] Aluminum and aluminum alloys are widely used because of their small mass density, high specific strength, easy oxidation to form a protective film on the surface, and good corrosion resistance in the atmosphere. However, under the action of acid, alkali and other media, their surface The oxide film is easily damaged and causes corrosion, which affects the performance and use of the material. Therefore, people have been looking for various ways to minimize the degree of corrosion for a long time, and the application of corrosion inhibitors has become one of the very important anti-corrosion methods. However, traditional corrosion inhibitors are toxic, difficult to degrade and pollute the environment. As an environment-friendly corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/00
Inventor 何新快江雨妹吴璐烨
Owner HUNAN UNIV OF TECH
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