Phosphorus-free polymer corrosion inhibitor composition, phosphorus-free corrosion inhibitor and application of phosphorus-free corrosion inhibitor

Abstract

The invention relates to the field of corrosion inhibitors, and discloses a phosphorus-free polymer corrosion inhibitor composition, a phosphorus-free corrosion inhibitor and application of the phosphorus-free corrosion inhibitor. The phosphorus-free polymer corrosion inhibitor composition comprises a component A, a component B, a component C and a component D in a weight ratio of 1: (0.25-8.00):(0.10-3.00): (0.10-2.50), wherein the component A is selected from at least one of compounds with the structure shown in formula (1), the component B is selected from at least one of non-phosphorus corrosion inhibition polymers, the component C is selected from at least one of organic acid and organic acid salt, and the component D is selected from at least one of water-soluble zinc salts. The corrosion inhibitor composition has a good corrosion inhibition effect, and can achieve a good corrosion inhibition effect under the condition of lower concentration of the corrosion inhibitor on the premise of not influencing the treatment effect, so that the cost is greatly saved.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a phosphorus-free polymer corrosion inhibitor composition, a phosphorus-free corrosion inhibitor and the application of the phosphorus-free corrosion inhibitor in inhibiting the corrosion of carbon steel in seawater. Background technique [0002] Petrochemical enterprises are large industrial water users. With the rapid development of industry and agriculture, the demand for fresh water resources continues to increase, resulting in increasingly scarce fresh water resources. About 70% of industrial water consumption is used for industrial cooling. Because seawater has the advantages of low water intake temperature, little seasonal influence, good cooling effect, and sufficient water source, it is of great significance to alleviate the shortage of freshwater resources in our country if seawater can be used instead of freshwater for industrial circulating cooling water. [0003]...

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Problems solved by technology

[0004] The formulations of corrosion and scale inhibitors used in cooling water treatment in my country are basically based on phosphorus-based formulations. Although the performance can basically meet the requirements for use, there are still deficiencies in phosphorus-based formulations: phosphorus-based water treatment agents are used in the process of using There is a hidden danger of easy formation of phosphate scale, which affects the heat exchange effect of the water cooler during long-term operation; the phosphorus formula promotes the reproduction of microorganisms in the circulating water, and consumes a large amount of fungicides; the discharge of a large amount of phosphorus can easily lead to eutrophication of the receiving water

[0005] CN107829091A discloses an environment-friendly carbon steel corrosion inhibitor containing crop straw solid extract, the weight fraction ratio of each raw material is: crop straw solid extract 40-60, hydroxyethyl methacrylate 1-5, zinc sulfate 5 -10. Sodium silicate 1-5, sodium molybdate 1-2, although the corrosion inhibition rate of carbon steel is high, the extraction process of the solid extract of crop straw is cumbersome, and a large amount of organic solvents are required in the extraction process

In this prior art, although the corrosion inhibition rate of the composite corrosion inhibitor is high, the amount of the corrosion inhibitor is large, and the cost of tungstate is high, so the cost of the corrosion inhibitor is relatively high

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