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Oligochitosan carbon steel seawater corrosion inhibitor and application thereof

A technology of corrosion inhibitor and chitosan oligosaccharide, which is applied in the field of steel seawater corrosion inhibitor, can solve the problems of relatively little research on green organic corrosion inhibitors, little research on corrosion protection, and poor environmental friendliness, so as to inhibit excessive corrosion , low cost, strong effect of continuous action

Inactive Publication Date: 2012-11-14
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used corrosion inhibitors mainly include inorganic compounds such as chromate, nitrate, and nitrite. Due to their toxic side effects and poor environmental friendliness, their application is being restricted and will be phased out.
Inorganic corrosion inhibitors such as gluconate, molybdate, zinc salt, and aluminum-based metal salts developed in the 1980s and 1990s also have good corrosion inhibition effects, but there are relatively few studies on green organic corrosion inhibitors.
At present, they are mainly used in cosmetics, medicine, food and other industries, while little research has been done on corrosion protection

Method used

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  • Oligochitosan carbon steel seawater corrosion inhibitor and application thereof
  • Oligochitosan carbon steel seawater corrosion inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The medium is 3.5% NaCl solution, the amount of medium is 500ml, 200mg chitosan oligosaccharide is added (the concentration of chitosan oligosaccharide is 400mg / L), and the carbon steel to be treated is immersed in the medium for 15d at room temperature.

[0022] The highest corrosion inhibition efficiency obtained through experimental testing is 76.5%, which shows that it is an efficient corrosion inhibitor for organic matter.

[0023] According to the above operation process, the corrosion inhibition efficiency of different concentrations of chitosan oligosaccharides was determined as follows:

[0024]

[0025]

Embodiment 2

[0027] The medium is seawater, the amount of the medium is 500ml, 200mg chitosan oligosaccharide is added, and the carbon steel to be prepared is immersed in the medium for 15 days at room temperature. Submerge carbon steel in this medium for 15 days at room temperature.

[0028] The highest corrosion inhibition efficiency obtained through experimental testing is 74.23%, which shows that it is an efficient corrosion inhibitor for organic matter.

Embodiment 3

[0030] The medium is 3.5% NaCl solution, the amount of the medium is 500ml, 200mg chitosan oligosaccharide and 500mg zinc sulfate are added, and the carbon steel to be prepared is immersed in the medium for 15d at room temperature.

[0031] The highest corrosion inhibition efficiency obtained through experimental testing is 78.53%, showing that it is an efficient corrosion inhibitor.

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Abstract

The invention relates to a steel product (carbon steel) seawater corrosion inhibitor, in particular to an oligochitosan corrosion inhibitor and an application thereof. The corrosion inhibitor comprises the components of oligochitosan with better water solubility after chitosan degradation or a combination of oligochitosan with one or two of zinc sulfate and hexamethylene tetramine. The corrosion inhibitor can effectively prevent the corrosion of seawater on carbon steel and has the advantages of low use amount, high corrosion inhibition efficiency and strong action duration capability. The product of the invention is an environmental-friendly green corrosion inhibitor and has a wide material source range, a broad market prospect and a good application value.

Description

technical field [0001] The invention relates to a steel seawater corrosion inhibitor, in particular to a chitosan oligosaccharide corrosion inhibitor used to prevent carbon steel and its products from being corroded in harsh seawater environments and excessive consumption of the corrosion inhibitor and its application. Background technique [0002] In the contemporary world, human beings are facing a crisis of serious shortage of fresh water resources. The utilization of seawater is one of the important measures to ensure the safety of water resources and the sustainable development of social economy. important way. However, due to the high salinity in seawater, there are many types of microorganisms and large organisms, and the concentration of corrosive ions is much higher than that of ordinary fresh water. Therefore, the use of metals in seawater has serious corrosion problems. The use of corrosion inhibitors in seawater media to protect metals in seawater environments i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
Inventor 李伟华李云菊张胜涛曹琨侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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