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Novel pickling corrosion inhibitor and application thereof in preparing metal pickling agent

A technology of pickling corrosion inhibitor and pickling agent, which is applied in the field of metal pickling corrosion and protection, can solve the problems of insufficient duration of corrosion inhibition effect and insufficient acidity range, and achieve long corrosion inhibition effect and suitable acidity range. wide effect

Inactive Publication Date: 2012-04-25
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The applicant has applied for an invention patent on O, O'-dicyclohexyl dithiophosphate-N, N-diethylammonium as a pickling corrosion inhibitor. The Chinese patent application number is 201010114594.0, although O, O'-dicyclo Hexyl dithiophosphoric acid-N, N-diethylammonium overcomes the shortcomings of the above-mentioned existing pickling corrosion inhibitors to a certain extent, has good metal corrosion inhibition effect, and its corrosion inhibition effect is affected by temperature, acidity, etc. Less impact, can be used for pickling of various metals, wide application range, low cost, suitable for industrial promotion and application, etc. However, O, O'-dicyclohexyl dithiophosphoric acid-N, N-diethylammonium The duration of the corrosion effect is not long enough, and the applicable acidity range is not wide enough. It is necessary to further explore a new type of corrosion inhibitor for pickling that is better and more promising.

Method used

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  • Novel pickling corrosion inhibitor and application thereof in preparing metal pickling agent
  • Novel pickling corrosion inhibitor and application thereof in preparing metal pickling agent
  • Novel pickling corrosion inhibitor and application thereof in preparing metal pickling agent

Examples

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Effect test

Embodiment 1

[0038] Embodiment 1 This embodiment is O, O'-bis (benzyl) dithiophosphoric acid-N, when the concentration of N-diethylammonium is different, the impact on the corrosion inhibition rate of sulfuric acid pickling solution:

[0039] In order to investigate the relationship between the concentration of O, O'-di(phenylmethyl)dithiophosphoric acid-N,N-diethylammonium and the corrosion inhibition rate of sulfuric acid pickling solution, the present embodiment is concentration, the same below), add O, O'-bis(benzyl)dithiophosphoric acid-N,N-diethylammonium, so that the concentration is 40-160mg / L (see Table 1), Under the temperature condition of 25±1℃, it was used for pickling of Q235 steel, and its corrosion inhibition rate was measured respectively. The results are shown in Table 1. And with O, O'-two (benzyl) dithiophosphoric acid-N, N-diethylammonium concentration C (mg / L) is abscissa, corrosion inhibition rate IE (%) is ordinate, obtains in 5 % in sulfuric acid pickling solution...

Embodiment 2

[0041] Example 2 This example is the influence of different acid concentrations of hydrochloric acid on the corrosion inhibition rate

[0042] In order to investigate the relationship between the acid concentration and the corrosion inhibition rate of the pickling solution, in this example, O, O'-bis(benzyl)dithiophosphoric acid-N,N-diethylammonium was added at the same concentration (100mg / L) In HCl solutions of different mass concentrations (see Table 2), it is used for pickling of Q235 steel under the temperature condition of 25±1°C, and the corrosion inhibition rate of each pickling solution is respectively measured, and the results are shown in Table 2. And with the concentration of hydrochloric acid (C HCl Mass concentration) is the abscissa, and the corrosion inhibition rate IE (%) is the ordinate, obtains in the hydrochloric acid pickling solution, the relation figure of hydrochloric acid concentration and corrosion inhibition rate, as figure 2 shown.

[0043] When ...

Embodiment 3

[0046] Example 3 This example is the influence of different temperatures on the corrosion inhibition rate of hydrochloric acid pickling solution

[0047] In order to investigate the relationship between the temperature and the corrosion inhibition rate of the pickling solution, in this embodiment, O, O'-bis(benzyl)dithiophosphoric acid-N,N-diethylammonium was added to the The same concentration of HCl solution (5%) was used for pickling of Q235 steel under different temperature conditions, and the corrosion inhibition rate of the pickling solution was measured at different temperatures. The results are shown in Table 3. And take pickling solution temperature T (° C.) as abscissa, corrosion inhibition rate IE (%) as ordinate, obtain in 5% hydrochloric acid pickling solution, the relation figure of temperature and pickling solution corrosion inhibition rate, as image 3 shown.

[0048] Table 3 Effect of temperature on corrosion inhibition rate of hydrochloric acid pickling solu...

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Abstract

The invention discloses a novel pickling corrosion inhibitor O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium. Two substituted groups are separately selected from the following substituted groups: aryl, substituted aryl and aryl substituted alkyl; and the carbon atom number of one of two substituted groups is less than 40. The invention also discloses application of the O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium serving as a metal pickling corrosion inhibitor. The O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium is added into a pickling medium with different concentration to make the concentration be between 40 and 160 mg / L so as to achieve the effective metal corrosion inhibiting effect; and the pickling corrosion inhibitor disclosed by the invention has long lasting effect and wide applicable acidity range.

Description

technical field [0001] The invention belongs to the technical field of metal pickling corrosion and protection, and particularly relates to the application of O, O'-disubstituted dithiophosphoric acid-N, N-diethylammonium as a metal pickling corrosion inhibitor. Background technique [0002] Corrosion is one of the challenges that all mankind needs to face. It is well known that metal corrosion is one of the most important aspects of corrosion. Metal corrosion not only brings huge economic losses to society, but also brings great harm to people's life and production. Therefore, people are constantly conducting research on metal pickling corrosion and protection, hoping to minimize the degree of metal pickling corrosion through efforts. At present, one of the most important and effective ways to reduce metal pickling corrosion in real life and production process is to add corrosion inhibitor in the pickling process. In recent years, significant progress has been made in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
Inventor 谢斌赖川邹立科冯建申
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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