A kind of carbon steel anticorrosion compound corrosion inhibitor used in neutral medium

Abstract

The invention relates to a composite corrosion inhibitor for corrosion protection of carbon steel in a neutral medium. A preparation method of the composite corrosion inhibitor comprises the following steps: (1) dissolving sodium chloride at a mass percentage of 1-5% with deionized water, and (2) adding sodium tungstate, cerous nitrate and neutral red at a mass ratio of (5-6):(4-5):(5-6) into a sodium chloride aqueous solution, and stirring for 10min at a constant temperature of 30 DEG C, wherein the total mass percentage of sodium tungstate, cerous nitrate and neutral red in the sodium chloride aqueous solution is 0.14-0.17%. The inhibitor is used for anticorrosion treatment of the carbon steel in the neutral medium, can effectively prevent or slow down a corrosion effect of Cl- in a high Cl- ion solution on the carbon steel, has significant corrosion inhibition ability, is low in production cost, green and environment-friendly, can effectively solve the corrosion problem of the carbon steel in the neutral medium, and a use method is simple.

Description

technical field [0001] The invention relates to a composite corrosion inhibitor used for carbon steel anticorrosion in the field of industrial circulating cooling water systems. Background technique [0002] Every year, a large amount of metal materials are lost due to corrosion, causing huge economic losses. Carbon steel is currently one of the most widely used metal materials, and about 80% of petroleum and chemical equipment are made of iron-carbon alloys. Carbon steel is a kind of steel with poor corrosion resistance, especially in highly corrosive working environments (such as seawater medium), corrosion becomes a more serious problem. [0003] Corrosion inhibitor is a substance that can reduce the corrosion rate of metals by adding a small amount to the corrosion system. It can prevent or slow down the corrosion of engineering materials. Its dosage is very small, generally 0.1% to 1%. But the effect is remarkable. Corrosion inhibitor anticorrosion technology is wide...

AI Technical Summary

Problems solved by technology

[0004] The existing literature reports and the research of our research group have shown that sodium tungstate, cerium nitrate and neutral red are environmentally friendly corrosion inhibitors, but they are used alone as corrosion inhibitors in neutral media to prevent corrosion of carbon steel. The main disadvantages: first, the dosage is large, the corresponding cost is high, which is not conducive to industrial production and application; second, the corrosion inhibition performance is unstable

Simply using a corrosion inhibitor, the corrosion inhibition film formed on the steel sheet is not very dense, and the effect of preventing aggressive ions is not as good as that of chromate

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