A Mannich base quaternary ammonium salt corrosion inhibitor

By using bis-Mannich base quaternary ammonium salt corrosion inhibitors to form a dense protective film on the metal surface, the void problem caused by the molecular structure of existing corrosion inhibitors is solved, achieving better corrosion inhibition effect and environmental friendliness, and reducing the corrosion rate.

CN122079872APending Publication Date: 2026-05-26CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing Mannich base corrosion inhibitors have large molecular structures, resulting in gaps in the protective film formed on the metal surface and poor corrosion inhibition effect. At the same time, small molecule synergists used in organic corrosion inhibitors, such as propynyl alcohol, have toxicity issues.

Method used

The bis-Mannich base quaternary ammonium salt corrosion inhibitor utilizes two pyridine rings connected by a long chain to adsorb onto the metal surface plane, and forms a dense protective film by filling the gaps between the pyridine rings with nitrogen atoms and long-chain alkyl groups, without using volatile toxic substances.

Benefits of technology

It improves the adsorption coverage and stability of the corrosion inhibitor, reduces the corrosion rate, and maintains the environmental friendliness and safety of the corrosion inhibitor. The corrosion rate is significantly reduced, and the acid compatibility is good.

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Abstract

This invention relates to the field of drilling composition technology, specifically to a Mannich base quaternary ammonium salt corrosion inhibitor. The Mannich base quaternary ammonium salt corrosion inhibitor of this invention comprises a bis-Mannich base quaternary ammonium salt, which has the structural formula of Formula I, wherein R is a C8-16 straight-chain alkyl group and X is a halogen. The unique linking group in the bis-Mannich base quaternary ammonium salt structure allows two pyridine rings to be simultaneously adsorbed onto the metal surface. The uniformly distributed nitrogen and oxygen atoms ensure strong adsorption of the corrosion inhibitor. Simultaneously, the directional arrangement of the long-chain alkyl groups attached after quaternization of the nitrogen atoms forms a hydrophobic protective layer. The uniformly distributed nitrogen and oxygen atoms, and the long-chain alkyl groups attached after quaternization of the nitrogen atoms, fill the voids in the protective film formed between the pyridine rings. This achieves improved corrosion inhibition effect of the macromolecular structure of the Mannich base quaternary ammonium salt corrosion inhibitor while maintaining its non-toxicity.
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Citation Information

Patent Citations

  • Pyridine derivative and Mannich base compound high-temperature acidizing corrosion inhibitor

    CN107418548A

  • A composite acidification and corrosion inhibitor of quinoline derivative and novel Mannich base

    CN107502333B

  • High-temperature acidizing corrosion inhibitor and preparation method thereof

    CN110105943A

  • Preparation process of corrosion inhibitor capable of being used for co-production

    CN118146778A