Dry-Functionalised Graphene Coatings for Lower-Zinc Corrosion Protection
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Solution Overview
Problem
Epoxy-based coatings used in the marine industry face challenges with high zinc content leading to brittle coatings, reduced service life, and increased corrosion rates due to zinc's amphoteric nature, along with environmental and cost issues from zinc oxide formation and handling of solvents.
Innovation Solution
Functionalising graphene with a chemical linker in a dry condition to disperse it evenly in a binder, reducing the need for solvents and metallic pigments, and incorporating it into coatings to enhance corrosion protection and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high quantities of zinc are incorporated in the coating, then corrosion protection is improved, but the coating becomes brittle and service life is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by incorporating functionalized graphene at concentrations of 0.1-5 wt%, which modifies the coating matrix properties to reduce brittleness while maintaining corrosion protection. The functionalized graphene acts as a reinforcement phase that improves mechanical properties without sacrificing corrosion resistance.
Solution Approach 2:
The patent creates a composite coating system by combining functionalized graphene with epoxy resin and metallic pigments. This composite structure allows the graphene to provide mechanical reinforcement and corrosion protection synergistically, reducing the need for high zinc content while maintaining overall coating performance.
2Reliability
If high quantities of zinc are incorporated in the coating, then corrosion protection is improved, but the service life of the coated structure is reduced
Solution Approach 1:
The patent uses functionalized graphene as a stable, non-sacrificial alternative to high concentrations of sacrificial zinc. The graphene provides long-term barrier protection that does not deplete over time, extending the service life of the coating system while maintaining corrosion protection.
Solution Approach 2:
The patent modifies the coating composition by adding functionalized graphene at 0.1-5 wt%, which changes the degradation kinetics of the coating system. The graphene reinforcement improves the coating's resistance to environmental degradation, thereby extending service life while maintaining corrosion protection levels.
3Object-affected harmful factors
If zinc content is reduced to prevent splashing and fume generation, then environmental and safety issues are reduced, but corrosion protection and mechanical properties deteriorate
Solution Approach 1:
The patent introduces functionalized graphene as an intermediary reinforcement phase that mediates between the reduced zinc content and the required corrosion protection. The graphene provides structural integrity and barrier properties that compensate for the lower zinc content, allowing reduced metallic pigment levels while maintaining protection performance.
Solution Approach 2:
The patent creates a hybrid composite coating system combining functionalized graphene with reduced zinc content. The graphene filler particles provide mechanical reinforcement and corrosion barrier functions that enable the coating to maintain protective performance with lower metallic pigment concentrations, thereby reducing splashing and fume generation.
4Stability of the object's composition
If solvents are used to disperse graphene, then graphene dispersion is improved, but handling and disposal issues increase
Solution Approach 1:
The patent extracts and removes solvents from the graphene functionalization process by using solvent-free methods. Graphene is functionalized directly in the dry state, eliminating the need for solvent dispersants and thereby eliminating associated handling and disposal issues while maintaining effective dispersion in the final coating.
Solution Approach 2:
The patent employs self-service functionalization where graphene is modified in its dry state using vapor-phase or direct contact methods. This self-functionalization approach eliminates the need for external solvent systems, allowing the graphene to be properly dispersed and functionalized without introducing harmful chemicals that require special handling and disposal.
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
The functionalised graphene reduces metallic pigment content by 50% while maintaining or improving corrosion resistance and mechanical properties, offering a cost-effective, eco-friendly, and lightweight coating solution with extended protection.
Implementation Method 1
functionalising graphene with a chemical linker when the graphene is in a substantially dry condition
Implementation Method 2
helps to ensure that the graphene is effectively dispersed and does not agglomerate in the binder
Data Source
AI summary
A method of preparing functionalised graphene is disclosed. The method includes the step of functionalising graphene with a chemical linker when the graphene is in a substantially dry condition.