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A Corrosion Inhibitor for Preventing Corrosion of High-strength Low-alloy Steel in Chloride-Containing Corrosion Medium

A low-alloy steel, corrosive medium technology, applied in the field of corrosion inhibitors to prevent high-strength low-alloy steel from corroding in chloride-containing corrosive medium, can solve problems such as no anti-corrosion inhibitor reports, and achieve the effect of improving efficiency

Inactive Publication Date: 2018-10-30
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite this, there is still no report on corrosion inhibitors for high-strength low-alloy steels in chloride corrosive media

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Example 1 When the corrosion inhibitor is composed of sodium nitrite compound 50ppm, sodium phosphate compound 200ppm, cerium trichloride compound 40ppm, and sodium tripolyphosphate is 200ppm, the corrosion inhibition of high-strength low-alloy steel in chloride-containing corrosive medium The rate is over 85%.

example 2

[0013] Example 2 When the corrosion inhibitor is composed of sodium nitrite compound 20ppm, the content of sodium nitrite is relatively reduced; sodium phosphate is 150ppm, the content of sodium tripolyphosphate is 300ppm; The corrosion inhibition rate is about 85%. Although the formula has reduced nitrate content, its toxicity is reduced. However, after adding cerium trichloride, the corrosion inhibition rate of high-strength low-alloy steel in chloride corrosion medium can still reach 85%.

example 3

[0014] Example 3 When the corrosion inhibitor is composed of sodium nitrite compound 20ppm, sodium phosphate 100ppm, sodium tripolyphosphate compound 250ppm, and cerium trichloride salt 60ppm, the corrosion inhibition rate of high-strength low-alloy steel in chloride corrosion medium reaches 95 %about. The content of sodium phosphate and sodium tripolyphosphate in this formula is reduced. At the same time, the content of cerium trichloride is kept unchanged, which more effectively inhibits corrosion.

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PUM

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Abstract

The invention provides a corrosion inhibitor capable of preventing high-strength low-alloy steel from being corroded in a chloride-containing corrosive medium and belongs to the field of inhibitors. The corrosion inhibitor comprises phosphate with the concentration being 300-600 ppm, sodium tripolyphosphate with the content being 200-400 ppm, sodium phosphate with the content being 100-200 ppm, a sodium nitrite compound with the concentration being 20-60 ppm and a cerium compound with the concentration being 30-80 ppm, wherein the cerium compound is cerium chloride, or cerium sulfate or cerium nitrate, and the valence state of cerium is +3. The corrosion inhibitor containing the rare earth element, namely cerium with the valence state being +3, is developed for preventing the high-strength low-alloy steel from being corroded in the chloride-containing corrosive medium so as to meet requirements of oceaneering and ship engineering in the ocean resource development process.

Description

technical field [0001] The invention belongs to the technique of using a corrosion inhibitor to prevent metal or alloy materials from corroding in a chloride-containing medium. That is, a corrosion inhibitor containing rare earth element cerium is used to prevent the corrosion of high-strength low-alloy steel in the chloride-containing corrosive medium, and its corrosion inhibition rate reaches more than 95%. Background technique [0002] Compared with the corrosion of carbon steel in chloride corrosion medium, although the average corrosion rate of high strength low alloy steel in chloride corrosion medium is lower, its corrosion still cannot be ignored. There are many ways to prevent metal materials in chloride corrosive media, such as organic coating, cathodic protection and corrosion inhibitor protection technology. Because the corrosion inhibitor technology is used in practice, especially for internal anticorrosion of circulating piping systems, it has the characterist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/18
CPCC23F11/188
Inventor 雍兴跃徐红艳肖宁张海燕王莹高新华闫雅琨卢亿文岳智君
Owner BEIJING UNIV OF CHEM TECH
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