Application of carbon steel corrosion inhibitor based on combination of physical adsorption, chemical adsorption and hydrophobic barrier

By preparing quaternized 4-aminopyridine-bromododecane, and combining physical adsorption, chemical adsorption and hydrophobic barrier, the problem of low efficiency of existing corrosion inhibitors in high temperature and strong acid environment is solved, achieving a high-efficiency and stable corrosion inhibition effect on carbon steel, which is suitable for acidic processes in petroleum and chemical industries.

CN121472874APending Publication Date: 2026-02-06CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202511523096.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-23
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

Existing corrosion inhibitors have low corrosion inhibition efficiency and limited applicability in high-temperature environments (303K~363K) and strong acid environments (1M~15%HCl).

Method used

Using 4-aminopyridine as the parent compound, quaternized 4-aminopyridine-bromododecane was prepared by a two-step functionalization modification. Combining physical adsorption, chemical adsorption and hydrophobic barrier, a triple synergistic mechanism was formed to serve as a corrosion inhibitor for carbon steel.

Benefits of technology

Under conditions of 15% HCl and 363K, the corrosion inhibition efficiency reaches 99%, the performance is stable, it is suitable for long-cycle industrial needs, the raw materials are readily available, the operation is simple, and the compatibility is strong.

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Abstract

The invention discloses application of a carbon steel corrosion inhibitor based on combination of physical adsorption, chemical adsorption and hydrophobic barrier, and relates to the technical field of metal corrosion inhibition. The technical problem that a corrosion inhibitor in the prior art is low in corrosion inhibition efficiency in a high-temperature strong-acid environment is solved. The preparation method of the carbon steel corrosion inhibitor comprises the following steps: firstly, ultrasonically dissolving 4-aminopyridine to obtain a solution I; then, dropwise adding an isopropanol solution of 2, 3-epoxypropyltrimethylammonium chloride into the solution I according to a molar ratio of 1: 1, removing a solvent through a rotary evaporation method, washing with ethanol, centrifuging to obtain quaternized 4-aminopyridine, and drying the quaternized 4-aminopyridine; and finally, the dried quaternized 4-aminopyridine and bromododecane are added into acetonitrile for a reaction, diethyl ether is dropwise added into obtained reaction liquid for precipitation, and the quaternized 4-aminopyridine-bromododecane carbon steel corrosion inhibitor is obtained after drying. The prepared carbon steel corrosion inhibitor is high in corrosion inhibition efficiency in a high-temperature and strong-acid environment.
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