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Metal pickling corrosion inhibitor, and preparation and application of metal pickling corrosion inhibitor

A technology of metal acid and corrosion inhibitor, applied in the preparation of N,N-di--1-phenylethylamine, application of metal pickling corrosion inhibitor in metal pickling corrosion inhibitor, metal pickling corrosion inhibition In the field of pickling agents, it can solve problems such as incalculability, difficulty, and economic loss, and achieve the effect of low concentration of pickling medium and good metal corrosion inhibition effect

Inactive Publication Date: 2015-08-12
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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  • Metal pickling corrosion inhibitor, and preparation and application of metal pickling corrosion inhibitor
  • Metal pickling corrosion inhibitor, and preparation and application of metal pickling corrosion inhibitor
  • Metal pickling corrosion inhibitor, and preparation and application of metal pickling corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: The influence of the concentration of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine on the corrosion inhibition rate of hydrochloric acid pickling metals

[0036] In this case, when the concentration of hydrochloric acid is the same (1mol / L, molar concentration, the same below), different concentrations (60mg / L, 80mg / L, 100mg / L, 120mg / L, 140mg / L, 180mg / L) are added. , 220mg / L) N,N-bis(diphenylphosphino)-(S)-1-phenethylamine (concentration calculation method: N,N-bis(diphenylphosphino)-(S) -1- The mass of phenethylamine divided by the volume of the hydrochloric acid pickling corrosion inhibitor), respectively used for Q235 steel pickling at a temperature of 25℃, to determine the metal acid of each pickling solution at different concentrations of corrosion inhibitor The corrosion inhibition rate is shown in Table 1.

[0037] And the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the hydrochloric acid lotion is the abscissa, and the c...

Embodiment 2

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

[0042] In this case, when the sulfuric acid concentration is the same (1mol / L, molar concentration, the same below), adding different concentrations (20mg / L, 40mg / L, 60mg / L, 80mg / L, 100mg / L, 120mg / L) ) N,N-bis(diphenylphosphino)-(S)-1-phenethylamine (concentration calculation method: N,N-bis(diphenylphosphino)-(S)-1-benzene Divide the mass of ethylamine by the volume of the sulfuric acid pickling corrosion inhibitor), and use it for Q235 steel pickling at a temperature of 25℃ to determine the metal pickling corrosion inhibition of each sulfuric acid pickling solution under different concentrations of corrosion inhibitors The results are shown in Table 2.

[0043] And the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the sulfuric acid lotion is the abscissa, and the corrosion inhibi...

Embodiment example 3

[0047] Implementation case 3: The influence of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine concentration on the corrosion inhibition rate of phosphoric acid pickling metals

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

[0049] And the concentration C (mg / L) of N,N-bis(diphenylphosphino)-(S)-1-phenethylamine in the phosphoric acid lotion is the abscissa, and the co...

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Abstract

The invention discloses a metal pickling corrosion inhibitor, and belongs to the technical field of metal pickling corrosion and protection. The metal pickling corrosion inhibitor is characterized in that the metal pickling corrosion inhibitor is N,N-bi(diphenylphosphino)-(S)-1-phenylethylamine. The preparation method of the metal pickling corrosion inhibitor comprises the steps that toluene, triethylamine and (S)-1-phenylethylamine are taken as raw materials; a toluene solution of chlorodiphenylphosphine is dropwise added under mixing; after mixing and reacting for 12h, suction filtration is performed; toluene washing is performed; pressure reduction spin drying is performed; toluene / petroleum ether (with a volume ratio of 1:1) serves as a developing agent, and passes through a silica gel short column; grease is obtained by spin drying under vacuum; and methyl alcohol is added, and the mixture stays for a night in a refrigerator. The invention further relates to an application of N,N-bi(diphenylphosphino)-(S)-1-phenylethylamine in a metal pickling corrosion inhibition solution. The metal pickling corrosion inhibition solution is obtained by adding N,N-bi(diphenylphosphino)-(S)-1-phenylethylamine to pickling solutions with different concentrations. The metal pickling corrosion inhibitor has the advantages that the metal pickling corrosion inhibitor is good in corrosion inhibition effect and is less affected by the standing time, the temperature and the concentrations of pickling mediums, and can be applied to different metal pickling and multiple pickling mediums.

Description

Technical field [0001] The invention belongs to the field of metal pickling corrosion and protection, and particularly relates to a metal pickling corrosion inhibitor, its preparation and application, specifically N,N-bis(diphenylphosphino)-(S)-1-phenylethyl The preparation method of amine and its application as metal pickling corrosion inhibitor in metal pickling corrosion inhibitor. 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 steel loss caused by metal corrosion accounts for about 10-20% of the steel output that year, causing serious economic losses and metal corrosion accidents. Indirect losses such as production shutdowns and power outages are even more incalculable. Therefore, people continue to conduct research on metal pickling corrosion and protection, hoping to reduce the degree of metal corrosion to a minimum. Through research, people hav...

Claims

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Application Information

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Patent Type & Authority Applications(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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