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Carbon steel pickling corrosion inhibitor based on polygonatum sibiricum polysaccharides

A technology of polysaccharide polysaccharide and corrosion inhibitor, which is applied in the direction of improving process efficiency, can solve the problems of high toxicity of corrosion inhibitor, secondary environmental pollution, poor water solubility, etc., and achieves inhibition of harmful corrosion, low dosage, and strong continuous action ability. Effect

Active Publication Date: 2020-03-06
威海创惠环保科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a green pickling corrosion inhibitor of Polygonatum extract and its application to solve the problems of high toxicity, refractory degradation, poor water solubility, high cost and technical problems of existing corrosion inhibitors. Complex, easy to cause secondary pollution to the environment and other issues

Method used

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  • Carbon steel pickling corrosion inhibitor based on polygonatum sibiricum polysaccharides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Pulverize the Rhizoma Polygonatum root with a pulverizer to make the particle size 80 mesh, and extract Polygonatum polysaccharide by water extraction and alcohol precipitation method.

[0022] (2) Use 1mol / L dilute hydrochloric acid to prepare cleaning solutions with concentrations of 100 mg / L, 200 mg / L, 400 mg / L and 600 mg / L respectively. Clean the carbon steel at 30°C and immerse it for 3 hours, and then carry out the weight loss test of the coupons. According to the formula: S = (K 0 −K 1 ) / K 0 Calculation of corrosion inhibition efficiency, where K 0 is the corrosion rate without corrosion inhibitor, K 1 is the corrosion rate of corrosion inhibitor.

Embodiment 2

[0024] (1) Pulverize the Rhizoma Polygonatum root with a pulverizer to make the particle size 80 mesh, and extract Polygonatum polysaccharide by water extraction and alcohol precipitation method.

[0025] (2) Use 0.5 mol / L dilute sulfuric acid to prepare cleaning solutions with concentrations of 100 mg / L, 200 mg / L, 400 mg / L and 600 mg / L respectively. Clean the carbon steel at 30°C and immerse it for 3 hours, and then carry out the weight loss test of the coupons. According to the formula: S = (K 0 −K 1 ) / K 0 Calculation of corrosion inhibition efficiency, where K 0 is the corrosion rate without corrosion inhibitor, K 1 is the corrosion rate of corrosion inhibitor.

[0026] The corrosion inhibition rate of Polygonatum polysaccharide corrosion inhibitor prepared in the above 2 examples to carbon steel in acidic solution is as follows:

[0027] Table 1 Example 1

[0028]

[0029] Table 2 Example 2

[0030] .

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Abstract

The invention relates to a carbon steel pickling corrosion inhibitor based on polygonatum sibiricum polysaccharides. The corrosion inhibitor is the polygonatum sibiricum polysaccharides, and can be used for preventing the consumption of metal or acid liquid in the pickling process of carbon steel and a product thereof. The corrosion inhibitor is a natural plant extract, has the characteristics ofbeing environment-friendly, low in price, wide in source and free of pollution, is suitable for industrial acid pickling of the carbon steel and the products thereof, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a carbon steel pickling corrosion inhibitor based on polygonatum polysaccharide. Background technique [0002] Among various metal materials, carbon steel is cheap, easy to smelt, and can meet most engineering requirements, so it is widely used in various aspects of machinery manufacturing. However, during casting, forging, welding and heat treatment of carbon steel, an oxide layer with dense texture and strong adhesion is easy to form on the surface, which affects its appearance quality and performance, and must be removed. [0003] Pickling is one of the important means to remove the oxide layer on the surface of carbon steel. However, in order to prevent the loss of steel materials caused by the "overcorrosion" phenomenon in the pickling process, or to avoid the increase of surface roughness, and the hydrogen embrittlement of the metal surface, it is an economical and effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/06C23G1/08Y02P10/20
Inventor 李惠静张维维陈立伟庞博一吴彦超
Owner 威海创惠环保科技有限公司
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