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Method for improving corrosion resistance of carbon steel

A corrosion-resistant, carbon steel technology, used in anti-corrosion coatings, process efficiency improvement, alkali metal silicate coatings, etc. Wide range, enhanced corrosion resistance

Inactive Publication Date: 2018-05-18
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Low hardness water is highly corrosive to carbon steel. Carbon steel corrosion in ultra-low hardness water systems is a prominent and difficult to solve problem in industrial water systems. In order to reduce carbon steel corrosion, corrosion inhibitors are generally used Among them, the addition of corrosion inhibitors is the most commonly used. Traditional corrosion inhibitors contain a large amount of nitrate and chromate, which not only consumes a lot of medicines, but also pollutes the environment. Therefore, , how to improve the corrosion resistance of carbon steel under the premise of ensuring environmental protection has become a technical problem that needs to be studied and solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for improving the corrosion resistance of carbon steel is provided with an isolation layer on the surface of a carbon steel workpiece, and the preparation method of the isolation layer comprises the following steps:

[0015] (1) Prepare the spacer solution, the component content of the spacer solution is: sodium fluorosilicate 900PPM, urea 300PPM, mercaptoethylamine 50PPM, sodium benzoate 3PPM, fatty amine 260PPM, surfactant 700PPM;

[0016] (2) Put the carbon steel workpiece into the sensor, pass through the 800Hz alternating current, make the surface temperature rise to 920°C, keep it for 4 minutes, turn off the alternating current, naturally cool down to 85°C and keep it warm for standby;

[0017] (3) Soak the above-mentioned treated carbon steel workpiece in the spacer solution for 50 seconds, and then irradiate it with a UV lamp with a power of 220W for 2 hours;

[0018] (4) After rinsing with water, dry it at a temperature of 55°C.

[0019] Wherein, the ...

Embodiment 2

[0022] A method for improving the corrosion resistance of carbon steel is provided with an isolation layer on the surface of a carbon steel workpiece, and the preparation method of the isolation layer comprises the following steps:

[0023] (1) Prepare the spacer solution, the component content of the spacer solution is: sodium fluorosilicate 1000PPM, urea 200PPM, mercaptoethylamine 80PPM, sodium benzoate 1PPM, fatty amine 500PPM, surfactant 800PPM;

[0024] (2) Put the carbon steel workpiece into the sensor, pass through 600Hz alternating current, make its surface temperature rise to 920°C, keep it for 4 minutes, turn off the alternating current, naturally cool down to 85°C and keep it warm for standby;

[0025] (3) Soak the above-mentioned treated carbon steel workpiece in the spacer solution for 50 seconds, and then irradiate it with a UV lamp with a power of 220W for 2 hours;

[0026] (4) After washing with water, dry it at a temperature of 65°C.

[0027] Wherein, the fat...

Embodiment 3

[0030] A method for improving the corrosion resistance of carbon steel is provided with an isolation layer on the surface of a carbon steel workpiece, and the preparation method of the isolation layer comprises the following steps:

[0031] (1) Prepare the spacer solution, the component content of the spacer solution is: sodium fluorosilicate 800PPM, urea 400PPM, mercaptoethylamine 20PPM, sodium benzoate 6PPM, fatty amine 30PPM, surfactant 600PPM;

[0032] (2) Put the carbon steel workpiece into the sensor, pass through 800Hz alternating current, make the surface temperature rise to 960°C, keep it for 2 minutes, turn off the alternating current, naturally cool down to 95°C and keep warm for standby;

[0033] (3) Soak the above-mentioned treated carbon steel workpiece in the spacer solution for 30 seconds, and then irradiate it with a UV lamp with a power of 260W for 1 hour;

[0034] (4) After rinsing with water, dry it at a temperature of 55°C.

[0035] Wherein, the fatty ami...

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Abstract

The invention belongs to the technical field of corrosion resistant machining of carbon steel, and particularly relates to a method for improving corrosion resistance of the carbon steel. An isolationlayer is arranged on the surface of the carbon steel workpiece, and the preparation method of the isolation layer comprises the following steps of preparing an isolation solution; carrying out the carbon steel pretreatment; treating isolation liquid and drying. Compared with the prior art, the method has the advantages that the carbon steel is treated by alternating current, so that martensite structure can be obtained in depth range of 20-40 microns on surface of the carbon steel workpiece, so that the environment pollution is avoided, and meanwhile, the corrosion resistance surface of the carbon steel is effectively enhanced, and the carbon steel can adapt to complex environments such as high temperature, acidity or alkalinity; and the carbon steel is wider in application range, and thecarbon steel is used for a super-high-hardness water system; a corrosion speed of the carbon steel is less than 0.02 mm / a, and the service life is obviously prolonged.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant processing of carbon steel, and in particular relates to a method for improving the corrosion resistance of carbon steel. Background technique [0002] Low hardness water is highly corrosive to carbon steel. Carbon steel corrosion in ultra-low hardness water systems is a prominent and difficult to solve problem in industrial water systems. In order to reduce carbon steel corrosion, corrosion inhibitors are generally used Among them, the addition of corrosion inhibitors is the most commonly used. Traditional corrosion inhibitors contain a large amount of nitrate and chromate, which not only consumes a lot of medicines, but also pollutes the environment. Therefore, How to improve the corrosion resistance of carbon steel under the premise of ensuring environmental protection has become a technical problem that needs to be studied and solved. Contents of the invention [0003] The objec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10C09D5/08C09D1/04
CPCC09D1/04C09D5/08C21D1/10C21D2211/008C21D2221/10Y02P10/25
Inventor 高欣王军
Owner 马鞍山市鑫龙特钢有限公司