Alloy corrosion inhibitor and corrosion inhibition method of high-chloride ion medium

An ionic medium and corrosion inhibitor technology, applied in the field of inorganic corrosion inhibitors, can solve the problems of high toxicity, environmental pollution, complex synthesis process, etc., and achieve the effect of good corrosion inhibition and corrosion mitigation

Inactive Publication Date: 2014-08-20
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process, organic substances are generally used as corrosion inhibitors to slow down the corrosion of alloys, but the synthesis process of some organic substances is complicated, the toxicity is high, and the pollution to the environment is serious, which is not conducive to safe production.

Method used

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  • Alloy corrosion inhibitor and corrosion inhibition method of high-chloride ion medium
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  • Alloy corrosion inhibitor and corrosion inhibition method of high-chloride ion medium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the above steps a and b, prepare 0.005mol L -1 1000ml of NaCl solution, and then successively with a molar concentration of 0.001mol L -1 Silver sulfate and benzotriazole were mixed with it for corresponding experiments (the experiment was repeated three times), and the experimental data were recorded and the corrosion inhibition efficiency under different working conditions was calculated.

[0039] Please combine figure 2 As shown, it is the Tafel polarization curve of Alloy690 in the same concentration of different corrosion inhibitors at 25°C in the present invention; please combine image 3 As shown, it is the polarization curve of the corrosion inhibition of Alloy690 by different proportions of silver sulfate in the present invention at 25°C.

[0040] Table 1 Corrosion inhibition performance comparison of different corrosion inhibitors

[0041]

[0042]

Embodiment 2

[0044] According to the above steps a and b, prepare 0.005mol L -1 1000ml of NaCl solution, and then successively with a molar concentration of 0.001mol L -1 , 0.003mol·L -1 , 0.005mol·L -1 , 0.01mol·L -1 Silver sulfate and benzotriazole were mixed with it for corresponding experiments (the experiment was repeated three times), and the experimental data were recorded and the corrosion inhibition efficiency under different working conditions was calculated.

[0045] combine image 3 As shown, it is the polarization curve of different ratios of benzotriazole (BTA) on the corrosion inhibition of Alloy690 at 25°C in the present invention.

[0046] Table 2 Comparison of corrosion inhibition performance of different proportions of corrosion inhibitors

[0047]

[0048] It can be seen from the above table 2 that the molar concentration of silver ions and mercury ions is 0.001mol L -1 , the effect is best.

[0049] The inorganic corrosion inhibitor of the present invention c...

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Abstract

The invention relates to an alloy corrosion inhibitor and a corrosion inhibition method of a high-chloride ion medium. The corrosion inhibitor is a saline solution which contains silver ions and mercury ions and has the concentration of 0.001-0.003mol/L, and can be used for reducing the concentration of chloride ions in a corrosive medium and forming a complex compound to be adsorbed on the surface of an alloy. The alloy corrosion inhibitor belongs to an inorganic matter corrosion inhibitor, can be used for reducing the concentration of the chloride ions in the corrosive medium, forming the complex compound to be adsorbed on the alloy surface, and effectively slowing down the corrosion of the alloy, is safe and environment-friendly, especially has relatively good corrosion inhibition performance when adding the alloy corrosion inhibitor with low concentration, and can be used for ensuring the safe operation of equipment.

Description

technical field [0001] The invention relates to the field of inorganic corrosion inhibitors, in particular to an alloy corrosion inhibitor for a high chloride ion medium and a corrosion inhibition method. Background technique [0002] At present, alloys have been widely used in chemical production, but some processes in the production process, such as pickling, acid derusting and other processes, are difficult to completely purify chloride ions, and sometimes even need to be operated in an environment with high chloride ions. The alloy equipment suffers severe localized corrosion. [0003] In recent years, the corrosion inhibitors used in factories include inorganic and organic, and there are many heterocyclic compounds containing N, S, O, and there are not many technologies for inorganic substances as corrosion inhibitors. In the production process, organic substances are generally used as corrosion inhibitors to slow down the corrosion of alloys, but the synthesis process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18
Inventor 胡军王赟余历军郑茂盛
Owner NORTHWEST UNIV(CN)
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