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Application of O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine in preparing metal pickle liquor

A technology of dicyclohexyl dithiophosphoric acid and diethylammonium, which is applied in the field of metal pickling corrosion and protection, and achieves the effects of wide application range, suitable for industrial promotion and application, and low cost

Inactive Publication Date: 2010-06-16
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is no research and related reports on the application of O, O'-dihydrocarbyl dithiophosphate and its complexes as pickling corrosion inhibitors.

Method used

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  • Application of O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine in preparing metal pickle liquor
  • Application of O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine in preparing metal pickle liquor
  • Application of O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine in preparing metal pickle liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 This example is the effect of different concentrations of O, O'-dicyclohexyl dithiophosphoric acid-N, N-diethylammonium on the corrosion inhibition rate of sulfuric acid pickling solution

[0023] In order to investigate the relationship between the concentration of O, O'-dicyclohexyl dithiophosphoric acid-N, N-diethylammonium and the corrosion inhibition rate of sulfuric acid pickling solution, in this example, the sulfuric acid concentration is the same (5%, mass percentage concentration, The same below), add O,O'-dicyclohexyl dithiophosphoric acid-N,N-diethylammonium to make the concentration 20-160mg / L (see Table 1 below), at 27±1 Under the temperature condition of ℃, it was used for pickling of Q235 steel respectively, and the corrosion inhibition rate of each pickling solution was measured, and the results are shown in Table 1 below. And take the concentration C (mg / L) of O, O'-dicyclohexyl dithiophosphoric acid-N, N-diethylammonium as the abscissa, an...

Embodiment 2

[0026] Example 2 This embodiment is the effect of different acid concentrations on the corrosion inhibition rate of sulfuric acid pickling solution

[0027] In order to investigate the relationship between the acid concentration and the corrosion inhibition rate of the pickling solution, in this example, O, O'-dicyclohexyldithiophosphoric acid-N,N-diethylammonium was added at the same concentration (100mg / L) to different concentrations H 2 SO 4 In the solution (see Table 2 below), it was used for pickling of Q235 steel at a temperature of 27±1°C, and the corrosion inhibition rate of each pickling solution was measured. The results are shown in Table 2 below. And take the sulfuric acid concentration (%) as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, to obtain the relationship diagram between the sulfuric acid concentration and the corrosion inhibition rate in the sulfuric acid pickling solution, as figure 2 shown.

[0028]

[0029] According...

Embodiment 3

[0030] Example 3 This embodiment is the influence of different temperatures on the corrosion inhibition rate of sulfuric acid pickling solution

[0031] In order to examine the relationship between the temperature and the corrosion inhibition rate of the pickling solution, in this example, O, O'-dicyclohexyldithiophosphoric acid-N,N-diethylammonium was added to the same concentration (100mg / L) h 2 SO 4 In the solution (5%), it 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 below. And taking the pickling solution temperature T (°C) as the abscissa, and the corrosion inhibition rate IE (%) as the ordinate, the relationship between the temperature and the corrosion inhibition rate of the pickling solution in the 5% sulfuric acid pickling solution is obtained, as shown in image 3 shown.

[0032]

[0033] According...

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Abstract

The invention discloses application of O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine in preparing a metal pickle liquor. An effective metal corrosion inhibition effect can be obtained through the step of adding the O-O'-dicyclohexyl phosphorodithioic acid-N,N-diethylamine into pickling mediums with different concentrations to lead the concentration of the pickling mediums to be 20-160 mg / L.

Description

[0001] technical field [0002] The invention belongs to the technical field of metal pickling corrosion and protection, in particular to the application of O, O'-dicyclohexyldithiophosphoric acid-N,N-diethylammonium in the preparation of metal pickling solution with corrosion inhibition effect . Background technique [0003] There have been many pickling solutions used in daily life and production, including inorganic acids such as sulfuric acid, hydrochloric acid, phosphoric acid, carbonic acid, and hydrofluoric acid, and organic acids such as citric acid and EDTA. The mass concentration of the pickling solution in the pickling process is generally Less than 20%, the pickling effect of sulfuric acid and hydrochloric acid is better among many acids. At the same time, the application of corrosion inhibitors has gone from acidic to alkaline; from water medium to oil medium; from liquid phase to gas phase; from single component to compound technology; from traditional metal m...

Claims

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Application Information

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