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Compounded corrosion inhibitor capable of inhibiting dissolved oxygen corrosion and preparation method and application thereof

A technology for inhibiting corrosion and corrosion inhibitors. It is applied in the field of corrosion inhibitors and compound corrosion inhibitors. It can solve the problems of easy pollution to the environment, poor corrosion inhibition effect, and poor water solubility, so as to achieve no emulsification tendency. , inhibition of dissolved oxygen corrosion, good water solubility

Active Publication Date: 2018-02-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although the prior art has a variety of corrosion inhibitors for inhibiting dissolved oxygen corrosion, the corrosion inhibitors are not good, the water solubility is not good, poisonous, and factors such as easy pollution to the environment have affected the popularization and application of corrosion inhibitors. Therefore, in this field It is urgent to develop a new type of corrosion inhibitor for inhibiting dissolved oxygen corrosion with excellent corrosion inhibition effect, good water solubility, non-toxicity, and no environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the reaction vessel, add 50g of water, 5g of zinc sulfate, 5g of sodium molybdate and raise the temperature to 60℃ with constant stirring. After mixing, add 10g of N-lauric acid sarcosine and 30g of fatty alcohol polyoxyethylene ether phosphate AEO-3P (CAS: 9002-92-0), continue stirring for 1 hour under constant temperature conditions, until the solution is uniform, and the compound type corrosion inhibitor for inhibiting corrosion of this embodiment is obtained.

Embodiment 2

[0035] In the reaction vessel, add 54g of water, 3g of sodium pyrophosphate, and 3g of sodium molybdate. Raise the temperature to 60℃ and keep stirring. After mixing, add 20g of N-lauric sarcosine and 20g of fatty alcohol polyoxyethylene ether phosphate AEO- 3P (CAS: 9002-92-0), continue to stir for 1.5 hours at a constant temperature, until the solution is uniform, that is, the compound type corrosion inhibitor for inhibiting dissolved oxygen corrosion in this embodiment is obtained.

Embodiment 3

[0037] In the reaction vessel, add 44g water, 3g zinc sulfate, 3g sodium molybdate and raise the temperature to 60°C and stir constantly. After mixing, add 30g N-lauric sarcosine and 20g fatty alcohol polyoxyethylene ether phosphate AEO-3P (CAS: 9002-92-0), continue to stir for 1.5 hours at a constant temperature, until the solution is uniform, and the compound type corrosion inhibitor for inhibiting dissolved oxygen corrosion in this embodiment is obtained.

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PUM

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Abstract

The invention provides a compounded corrosion inhibitor capable of inhibiting dissolved oxygen corrosion and a preparation method and application thereof. The compounded corrosion inhibitor comprises10-50 wt.% of acyl sarcosine or a derivative of the acyl sarcosine, 10-30 wt.% of a surface active agent, 2-10 wt.% of molybdate, 0-10 wt.% of zinc salt, 0-10 wt.% of phosphate and the balance water,and the total amount is 100%. The corrosion inhibitor is compounded by organic components and inorganic components, dissolved oxygen corrosion can be effectively inhibited through the synergistic inhibition effect of an organic corrosion inhibitor and an inorganic corrosion inhibitor, the compounded corrosion inhibitor is good in water solubility, free of emulsification tendency and non-poisonous,can be applied to an oil field system to prevent dissolved oxygen corrosion, is low in cost and environmentally friendly, and the addition amount is small.

Description

Technical field [0001] The invention relates to a corrosion inhibitor and a preparation method and application thereof, in particular to a compound corrosion inhibitor for inhibiting dissolved oxygen corrosion and a preparation method and application thereof, and belongs to the technical field of oil field chemistry. Background technique [0002] Metal equipment in industrial cooling water and oilfield water injection systems, such as various heat exchangers, pumps, valves, pipelines, tubing and tubing, and storage tanks, etc., are perforated due to the corrosion of cooling water and oilfield sewage . Oxygen depolarization corrosion is the main cause of this type of corrosion. [0003] The reaction principle of the corrosion battery of carbon steel in cooling water or oilfield sewage is generally: [0004] Anodic reaction Fe→Fe 2+ +2e - ; [0005] Cathodic reaction O 2 +2H 2 O→4OH - ; [0006] Total reaction 2Fe+2H 2 O+O 2 →2Fe(OH) 2 ↓ [0007] The ferrous hydroxide produced will cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 于浩波何洋陈长风于延钊姜瑞景
Owner CHINA UNIV OF PETROLEUM (BEIJING)