Multi-ionic surfactants for corrosion inhibition
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Solution Overview
Problem
Corrosion of metal surfaces in aqueous media remains a significant challenge across various industries due to the presence of aggressive constituents like brines, organic acids, and microorganisms, which cause severe corrosion and damage to high alloy steels and other metal surfaces.
Innovation Solution
The development of multi-ionic surfactant compounds with a specific structure, as described by Formula 1, or its salts, which can be used as surfactants, fabric softening agents, corrosion inhibitors, bio-film inhibitors, biocides, and rheology modifiers, effectively address the corrosion issue by forming protective coatings on metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfactants or gemini surfactants are used, then basic surfactant functions are achieved, but corrosion inhibition effectiveness is insufficient in aggressive aqueous media
Solution Approach 1:
The patent combines multiple ionic groups (anionic, cationic, and/or zwitterionic) within a single surfactant molecule to create multi-ionic surfactants. This merging of different ionic characteristics enables the surfactant to provide both excellent corrosion inhibition and multiple additional functions including biofilm inhibition, biocide activity, and rheology modification, thereby resolving the contradiction between corrosion effectiveness and multi-functionality.
Solution Approach 2:
The multi-ionic surfactants represent a composite molecular structure integrating different ionic functionalities. By creating surfactants with composite ionic characteristics (combining anionic, cationic, and zwitterionic groups), the invention achieves enhanced corrosion protection while simultaneously providing multiple ancillary functions that conventional single-ionic surfactants cannot deliver.
2Object-generated harmful factors
If sodium hypochlorite solutions are used for cleaning and sanitizing, then effective bleaching and sanitizing are achieved, but severe corrosion of metal surfaces occurs
Solution Approach 1:
The multi-ionic surfactants act as intermediary protective agents between the sanitizing environment and metal surfaces. By forming protective adsorption layers on metal surfaces, these surfactants mediate the interaction between aggressive aqueous media (including sodium hypochlorite solutions) and metal surfaces, allowing sanitizing effectiveness to be maintained while preventing direct corrosive attack on the metal.
Solution Approach 2:
The invention converts the potentially harmful multi-ionic character that could lead to instability into a beneficial property. The presence of multiple ionic groups creates electrostatic repulsion that stabilizes the surfactant in aggressive environments while simultaneously providing enhanced adsorption capability on metal surfaces, thus transforming what could be a destabilizing factor into improved corrosion protection and sanitizing performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These multi-ionic surfactant compounds demonstrate enhanced effectiveness in inhibiting corrosion, biofilm growth, and bacterial growth, while also improving the rheology of compositions, thus providing a multifunctional solution for various industrial applications.
Implementation Method 1
Corrosion inhibitors are usually surface-active compounds that form protective coatings on the surface of metals and suppress corrosion by preventing or reducing contact of the corrosive species to the pipeline surface
Data Source
AI summary
Compounds, compositions and methods are provided as surfactants, fabric softening agents, corrosion inhibitors, bio-film inhibitors, biocides, and rheology modifiers. The multi-ionic surfactants are compounds having a structure corresponding to Formula 1, or a salt thereof:Wherein R1 is C1-C10 alkylene; R2 is independently hydrogen, —(CH2)x—NR20R21, or —(CH2)x—C(R10)—C(O)—X—Z; R3 and R4 are independently hydrogen, —(CH2)x—C(R10)—C(O)—X—Z, or R3 and R4 together with the nitrogen they are attached to form a substituted nitrogen-containing heterocyclyl; R5 and R6 are independently hydrogen, —(CH2)x—C(R10)—C(O)—X—Z, or R5 and R6 together with the nitrogen they are attached to form a substituted nitrogen-containing heterocyclyl; R10 is hydrogen, alkyl, aryl, or alkaryl; R11, R12, and R13 are independently C1 to C1 alkyl or alkaryl; R20 and R21 are independently hydrogen, —(CH2)x—NR20R21, —(CH2)x—C(R10)—C(O)—X—Z, or together with the nitrogen they are attached to form a substituted nitrogen-containing heterocyclyl; X is NH or O; Z is hydrogen, L1-NR11R12R13, L2-PR11R12R13, L3-COOH, L4-SO3H, L5-PO3H, or a salt thereof; L1, L2, L3, L4, and L5 are independently C1-C1 alkylene or alkenylene; n is an integer of 1 to 10; and x is an integer of 1 to 10; wherein at least one of R3 and R4, or R5 and R6 together form a substituted nitrogen-containing heterocyclyl; and wherein at least one R2 is —(CH2)x—C(R10)—C(O)—X—Z or —(CH2)x—NR20R21 wherein one of R20 or R21 is —(CH2)x—C(R10)—C(O)—X—Z.