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Preparation method of o,o'-di(phenylmethyl)benzyl dithiophosphate and its application in metal pickling solution

A technology of benzyl dithiophosphate and dithiophosphoric acid, applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems affecting corrosion inhibition effect and poor solubility , to achieve the effect of low production cost, good compatibility and wide application range

Active Publication Date: 2015-08-05
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In further research, the applicant found that certain O,O'-dihydrocarbyl dithiophosphate ammonium salts have poor solubility in pickling medium, which affects their corrosion inhibition effect

Method used

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  • Preparation method of o,o'-di(phenylmethyl)benzyl dithiophosphate and its application in metal pickling solution
  • Preparation method of o,o'-di(phenylmethyl)benzyl dithiophosphate and its application in metal pickling solution
  • Preparation method of o,o'-di(phenylmethyl)benzyl dithiophosphate and its application in metal pickling solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This example is the effect of different concentrations of benzyl O, O'-bis(benzyl)dithiophosphate on the corrosion inhibition rate of hydrochloric acid pickling solution.

[0051] In this example, under the same concentration of hydrochloric acid (1mol / L, molar concentration, the same below), the corrosion inhibitor of the present invention (O,O'-di(benzyl)benzyl phosphorodithioate) was added to make The concentration of benzyl O,O'-bis(benzyl)dithiophosphate is 20-160 mg / L (see Table 1). Under the temperature condition of 30±1°C, 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. And take the O,O'-bis(phenylmethyl)dithiophosphoric benzyl ester concentration C (mg / L) as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, to obtain the pickling solution in 1mol / L hydrochloric acid In the figure, the relationship between the concentration of O...

Embodiment 2

[0056] This example is the effect of different acid concentrations on the corrosion inhibition rate of hydrochloric acid pickling solution.

[0057] In this example, O,O'-di(phenylmethyl)benzyl dithiophosphate was added to different concentrations of HCl solutions (see Table 2) at the same concentration (80mg / L), and the temperature was 30±1°C Next, they were used for pickling of Q235 steel, and the corrosion inhibition rate of each pickling solution was measured. The results are shown in Table 2.

[0058] Table 2 Effect of hydrochloric acid concentration on corrosion inhibition rate of hydrochloric acid pickling solution

[0059] HCl concentration (mol / L)

2

3

4

Corrosion inhibition efficiency (%)

98.69

98.63

98.59

[0060] At the same time, taking the concentration of hydrochloric acid (mol / L) as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, the relationship between the concentration of hydrochloric aci...

Embodiment 3

[0063] This example is the effect of time on the corrosion inhibition rate of hydrochloric acid pickling solution.

[0064] In this example, O,O'-di(phenylmethyl)benzyl dithiophosphate was added to the same concentration of HCl solution (1mol / L) at the same concentration (80mg / L), and under different time conditions, respectively It is used for pickling of Q235 steel, and the corrosion inhibition rate of the pickling solution is measured at different times, and the results are shown in Table 3.

[0065] Table 3 The influence of time on the corrosion inhibition rate of hydrochloric acid pickling solution

[0066] time (h)

24

48

72

96

120

Corrosion inhibition efficiency (%)

98.00

97.90

97.79

97.46

97.23

[0067] At the same time, take the concentration C (mg / L) of benzyl O, O'-bis(phenylmethyl)dithiophosphate as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, to obtain In the solution, the r...

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Abstract

The invention discloses a preparation method of O,O'-bis(phenylmethyl)dithiophosphoric acid benzyl ester and an application of the O,O'-bis(phenylmethyl)dithiophosphoric acid benzyl ester in metal pickling solution and aims to solve the problems that the types of corrosion inhibitors meeting demands are in serious shortage while the demands of users on the functions of the corrosion inhibitors are increased day by day. The preparation method comprises the following steps of: (1) synthesizing O,O'-bis(phenylmethyl)dithiophosphoric acid-N,N-diethylamine; and (2) synthesizing the O,O'-bis(phenylmethyl)dithiophosphoric acid benzyl ester. The metal pickling solution prepared by utilizing the preparation method has the advantages of good metal corrosion inhibition effect, good consistency and wide application range, can be compatible with almost all inorganic pickling media, has the corrosion inhibition efficiency slightly influenced by the time, the acidity and the like and can be used for pickling various metals. Meanwhile, according to the preparation method and the application, a novel application field of O,O'-bis(phenylmethyl)dithiophosphoric acid benzyl ester compounds is expanded.

Description

technical field [0001] The invention relates to the field of metal pickling corrosion and protection, especially the preparation method of O,O'-di(phenylmethyl)benzyl dithiophosphate and its application in metal pickling liquid, specifically O,O' -A preparation method of benzyl dithiophosphate and its application in the preparation of metal pickling solutions with corrosion inhibition. Background technique [0002] Corrosion is an important destructive factor in modern industry and life, among which metal corrosion causes the most serious losses to modern industry and life. It is estimated that the direct economic losses caused by steel corrosion in my country account for about 3-4% of the gross national product. In the process of chemical pickling of metal equipment and components, while the pickling solution dissolves metal oxides (such as rust, scale, etc.), it will also corrode the metal substrate and cause hydrogen embrittlement corrosion of metal equipment, resulting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/165C23G1/06
Inventor 谢斌朱莎莎李玉龙邹立科林肖王艳美冯建申
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING