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A kind of corrosion inhibitor for metal pickling, its preparation and application

A metal acid and corrosion inhibitor technology, applied in the preparation of N,N-di--1-phenethylamine, the application of metal pickling corrosion inhibitor in metal pickling corrosion inhibitor, metal pickling corrosion inhibition It can solve the problems of incalculability, difficulty and economic loss, and achieve the effect of low concentration of pickling medium and good metal corrosion inhibition effect.

Inactive Publication Date: 2017-09-15
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal corrosion has caused great damage and difficulties to the existing national economy and people's lives. According to statistics, the annual loss of steel due to metal corrosion accounts for about 10-20% of the steel output of the year, causing serious economic losses. Metal corrosion accidents Indirect losses such as production stoppages and power outages are even more incalculable.

Method used

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  • A kind of corrosion inhibitor for metal pickling, its preparation and application
  • A kind of corrosion inhibitor for metal pickling, its preparation and application
  • A kind of corrosion inhibitor for metal pickling, its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Effect of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine concentration on corrosion inhibition rate of hydrochloric acid pickled metal

[0036] In this implementation case, when the concentration of hydrochloric acid is the same (1mol / L, molar concentration, the same below), adding different concentrations (60mg / L, 80mg / L, 100mg / L, 120mg / L, 140mg / L, 180mg / L , 220mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine (concentration calculation method is: N,N-bis(diphenylphosphino)-(S) - the mass of 1-phenylethylamine divided by the volume of hydrochloric acid pickling corrosion inhibitor), under the temperature condition of 25 ℃, it was used for pickling Q235 steel respectively, and the metal acid content of each pickling solution under different concentrations of corrosion inhibitor was determined The results are shown in Table 1.

[0037] And take the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the hydrochloric acid washi...

Embodiment 2

[0041] Example 2: Effect of the concentration of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine on the corrosion inhibition rate of sulfuric acid pickling metal

[0042] This implementation case is in the case of the same concentration of sulfuric acid (1mol / L, molar concentration, the same below), adding different concentrations (20mg / L, 40mg / L, 60mg / L, 80mg / L, 100mg / L, 120mg / L ) of N,N-bis(diphenylphosphino)-(S)-1-phenylethylamine (concentration calculation method is: N,N-bis(diphenylphosphino)-(S)-1-phenyl Divide the mass of ethylamine by the volume of sulfuric acid pickling corrosion inhibitor), under the temperature condition of 25 ℃, it is used for pickling Q235 steel respectively, and the metal pickling corrosion inhibition of each sulfuric acid pickling solution under different concentrations of corrosion inhibitors is determined The results are shown in Table 2.

[0043] And take the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the su...

Embodiment example 3

[0047] Example 3: Effect of N,N-bis(diphenylphosphino)-(S)-1-phenylethylamine concentration on corrosion inhibition rate of phosphoric acid pickling metal

[0048] In this implementation case, when the concentration of phosphoric acid is the same (1mol / L, molar concentration, the same below), different concentrations (20mg / L, 40mg / L, 60mg / L, 80mg / L, 100mg / L, 120mg / L ) of N,N-bis(diphenylphosphino)-(S)-1-phenylethylamine (concentration calculation method is: N,N-bis(diphenylphosphino)-(S)-1-phenyl Divide the mass of ethylamine by the volume of phosphoric acid pickling corrosion inhibitor), under the temperature condition of 25 ℃, it is used for pickling of Q235 steel respectively, and the metal pickling corrosion inhibition of each phosphoric acid pickling solution under different concentrations of corrosion inhibitors is determined rate, and the results are shown in Table 3.

[0049] And take the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the...

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Abstract

The invention discloses a metal pickling corrosion inhibitor, which belongs to the technical field of metal pickling corrosion and protection. The metal pickling corrosion inhibitor is N,N-bis(diphenylphosphino)-(S)-1-phenethylamine, and its preparation method is based on toluene, triethylamine and S-(1)-benzene Ethylamine was used as a raw material, and the toluene solution of diphenylphosphine chloride was added dropwise under stirring, and after mixing and stirring for 12 hours, suction filtration, and washing with toluene, spin-drying under reduced pressure, and using toluene / petroleum ether (volume ratio of 1:1 ) was used as a developer to pass through a short column of silica gel, and spin-dried under vacuum to obtain an oily substance, which was then added to methanol and kept overnight in the refrigerator. The present invention also relates to the application of the N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in metal pickling corrosion inhibitors, which can be obtained by adding it to pickling solutions with different concentrations. A corrosion inhibitor solution for metal pickling was obtained. The metal pickling corrosion inhibitor of the invention has good corrosion inhibition effect, is less affected by storage time, temperature, and pickling medium concentration, and can be applied to different metal pickling and various pickling mediums.

Description

technical field [0001] The invention belongs to the field of metal pickling corrosion and protection, in particular to a metal pickling corrosion inhibitor, its preparation and application, specifically N,N-bis(diphenylphosphino)-(S)-1-phenylethyl A preparation method of amine and its application as metal pickling corrosion inhibitor in metal pickling corrosion inhibitor solution. Background technique [0002] Metal corrosion has caused great damage and difficulties to the existing national economy and people's lives. According to statistics, the annual loss of steel due to metal corrosion accounts for about 10-20% of the steel output of the year, causing serious economic losses. Metal corrosion accidents The indirect losses such as production stoppage and power outage caused by it are even more incalculable. Therefore, people continue to carry out research on metal pickling corrosion and protection, hoping to minimize the degree of metal corrosion through efforts. Through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C07F9/46
Inventor 谢斌魏健赖川何林芯陈炯
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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