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Quaternary ammonium salt ionic liquid, synthesis method and application of quaternary ammonium salt ionic liquid as metal corrosion inhibitor

A quaternary ammonium salt ion, metal corrosion inhibitor technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino compounds, etc., can solve problems such as unsatisfactory corrosion inhibition effect

Active Publication Date: 2020-10-27
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing corrosion inhibitors still have defects such as unsatisfactory corrosion inhibition effect

Method used

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  • Quaternary ammonium salt ionic liquid, synthesis method and application of quaternary ammonium salt ionic liquid as metal corrosion inhibitor
  • Quaternary ammonium salt ionic liquid, synthesis method and application of quaternary ammonium salt ionic liquid as metal corrosion inhibitor
  • Quaternary ammonium salt ionic liquid, synthesis method and application of quaternary ammonium salt ionic liquid as metal corrosion inhibitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of quaternary ammonium salt ionic liquid, this quaternary ammonium salt ionic liquid comprises [N 8,8,8,12 ][NTf 2 ], [N 8,8,8,14 ][NTf 2 ] and [N 8,8,8,Bn ][NTf 2 ], the [N 8,8,8,12 ][NTf 2 ], [N 8,8,8,14 ][NTf 2 ] and [N 8,8,8,Bn ][NTf 2 ] The molecular structural formulas are as follows:

[0028] ,

[0029] ,

[0030] .

[0031] 1. Quaternary ammonium salt ionic liquid [N 8,8,8,12 ][NTf 2 ] The synthetic method comprises the steps:

[0032] 1) Add 10.6 g (30 mmol) trioctylamine, 14.94 g (60 mmol) dodecyl bromide and 30 mL DMF into a 100 mL three-neck flask, 2 Reflux under protection for 10 h. After the reaction, the solution changed from a colorless liquid to a yellow colloidal solid and was cooled to room temperature. Add 30 mL of petroleum ether into the three-necked flask, sonicate, and stand still, the system appears to be separated, the upper layer is a light yellow liquid, and the lower layer is a white solid; solid-liquid separat...

Embodiment 2

[0045] Ionic liquid corrosion inhibitor of the present invention [N 8,8,8,12 ][NTf 2 ], [N 8,8,8,14 ][NTf 2 ] and [N 8,8,8,Bn ][NTf 2 ] Corrosion inhibition of AZ31B magnesium alloy in 0.05wt.% NaCl solution.

[0046] The electrochemical test was performed with Shanghai Chenhua CHI650E electrochemical workstation. The electrochemical test was carried out under the three-electrode system, the saturated calomel electrode was used as the reference electrode (SCE), the platinum electrode was used as the counter electrode (CE), and the AZ31B magnesium alloy was used as the working electrode (WE). The size of the AZ31B magnesium alloy is 1 cm × 1 cm × 0.5 cm. Composition of AZ31B magnesium alloy: aluminum 2.5~3.5wt.%, zinc 0.6~1.4 wt.%, manganese 0.2~1.0 wt.%, silicon 0.08 wt.%, calcium 0.04 wt.%, copper 0.01 wt.%, iron 0.003 wt.%, nickel 0.001 wt.%, other elements 0.30 wt.%, and the balance is magnesium.

[0047] Before the test, the AZ31B magnesium alloy was polished and p...

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Abstract

The invention discloses a synthesis method of quaternary ammonium salt ionic liquid ([N8, 8, 8, 12] [NTf2], [N8, 8, 8, 14] [NTf2] and [N8, 8, 8, Bn] [NTf2]) and application of the ionic liquid as a metal corrosion inhibitor, especially a magnesium alloy corrosion inhibitor. The problems of corrosion and the like of existing magnesium metal and magnesium alloy are solved, and the corrosion inhibition efficiency reaches 80% or above. The quaternary ammonium salt ionic liquid has the advantages of being low in cost, simple in synthetic route, high in corrosion inhibition efficiency and the like,and the yield of the prepared quaternary ammonium salt ionic liquid can reach 60% or above.

Description

technical field [0001] The invention belongs to the technical field of ionic liquids, and in particular relates to a class of quaternary ammonium salt ionic liquids, a synthesis method and its application as a metal corrosion inhibitor, especially for the corrosion inhibition of magnesium alloys. Background technique [0002] Magnesium alloys have been widely used in many fields such as automobiles, computers, communications, and aerospace. Many countries regard them as important strategic materials in the 21st century and have issued several development plans. Magnesium alloy has become the material of choice for the lightweight development of the manufacturing industry due to its light weight, excellent structural performance, and easy recycling; and compared with steel in terms of reserves, characteristics, application range, recycling, and energy saving and environmental protection, it has advantages. Very obvious advantage. The global consumption of magnesium alloys is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/63C07C311/09C07C303/40C07C209/12C23F11/14C23F11/16
CPCC07C211/63C07C311/09C23F11/164C23F11/143
Inventor 任铁钢张敬来王丽刘月黄秋硕
Owner HENAN UNIVERSITY