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Seawater corrosion inhibitor for carbon steel and application method thereof

An application method and corrosion inhibitor technology, which is applied in the field of seawater corrosion inhibitors for carbon steel, can solve the problems of poor continuous corrosion inhibition effect, unfriendly environment, unfavorable degradation, etc., and achieve low price, improved product quality, and easy access to raw materials. The effect

Active Publication Date: 2018-08-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commonly used corrosion inhibitors are not only costly, but also have poor corrosion inhibition effects, are not conducive to degradation, and are not friendly to the environment.

Method used

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  • Seawater corrosion inhibitor for carbon steel and application method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Raw materials in terms of mass percentage: 10% polyaspartic acid, 8% sodium gluconate, 5% sodium molybdate, 5% zinc sulfate, and 72% water. The carbon steel seawater corrosion inhibitor 1 is prepared by uniformly mixing these raw materials.

[0020] According to GB10124-88 "Metallic Materials Laboratory Uniform Corrosion Total Immersion Test Method", the hanging piece weight loss test is carried out, and the test medium is artificial sea water. The experimental results are as follows: when the temperature is 30°C and the concentration of carbon steel seawater corrosion inhibitor 1 is 150mg / L, the corrosion inhibition rate for Q235 carbon steel in seawater is 91.7%.

[0021] like figure 1 As shown, the existing seawater corrosion inhibitor is line 1 and line 2 in the figure, and the seawater corrosion inhibitor 1 of the present invention is line 3 in the figure. It can be seen from the figure that the seawater corrosion inhibitor of the present invention not only has go...

Embodiment 2

[0023] Raw materials by mass percentage: 10% polyaspartic acid, 8% sodium gluconate, 5% sodium molybdate, 5% zinc sulfate, 72% water, these raw materials are evenly mixed to prepare carbon steel seawater corrosion inhibitor 2.

[0024] According to GB10124-88 "Metallic Materials Laboratory Uniform Corrosion Total Immersion Test Method", the hanging piece weight loss test is carried out, and the test medium is artificial sea water. The experimental results are: when the temperature is 20°C and the carbon steel seawater corrosion inhibitor 2 is added at a concentration of 150mg / L, the corrosion inhibition rate for Q235 carbon steel in seawater is 85.9%.

Embodiment 3

[0026] Raw materials in terms of mass percentage: 5% polyaspartic acid, 4% sodium gluconate, 3% sodium molybdate, 4% zinc sulfate, and 84% water. The carbon steel seawater corrosion inhibitor 3 is prepared by uniformly mixing these raw materials.

[0027] According to GB10124-88 "Metallic Materials Laboratory Uniform Corrosion Total Immersion Test Method", the hanging piece weight loss test is carried out, and the test medium is artificial sea water. The experimental results are: when the temperature is 30°C and the concentration of the carbon steel seawater corrosion inhibitor 3 is 150mg / L, the corrosion inhibition rate for Q235 carbon steel in seawater is 85.3%.

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Abstract

The invention provides a seawater corrosion inhibitor for carbon steel, which is characterized in that it is formed by mixing the following components according to mass percentage: 2-10% polyaspartic acid, 2-8% sodium gluconate, molybdenum Salt 3-5%, zinc sulfate 4-8%, the balance is water. The seawater corrosion inhibitor for carbon steel of the invention not only has a good inhibitory effect on the corrosion of carbon steel in seawater, but also has good inhibitory effect, low cost, environmental friendliness and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of marine environment corrosion and protection, and specifically refers to a seawater corrosion inhibitor for carbon steel and an application method thereof. Background technique [0002] Metal corrosion is a failure process of metals under the action of environmental corrosive media. It is the inverse process of metallurgical production. Due to the continuous increase of entropy, it is an inevitable natural phenomenon that occurs completely spontaneously. The marine environment is extremely and complexly corrosive, and metal materials often undergo particularly severe corrosion in seawater. Once the metal material corrodes, its mechanical properties will be reduced, and its proper strength, hardness, and plasticity will also be lost, resulting in complete failure of the material and complete destruction of the structure. The annual economic loss caused by seawater corrosion is extremely alarming. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
Inventor 程鹏庞涛马颖郎丰军黄先球王辉陈叶清何锐
Owner 武汉钢铁有限公司