Hydroxyl Graphene Plating Sealant for Corrosion Resistance
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Solution Overview
Problem
Existing plating sealants for zinc-nickel alloy and zinc coatings suffer from reduced performance due to precipitation of reduced graphene oxide, presence of corrosive radicals, and inadequate distribution of graphene, leading to defective products and insufficient corrosion resistance.
Innovation Solution
A hydroxyl graphene-modified plating sealant is developed, comprising a nanoscale hydroxyl graphene aqueous solution, silica sol, and water-soluble silane polymer, which allows for uniform distribution and dehydration condensation, enhancing corrosion and abrasive resistance, and eliminating the need for surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reduced graphene oxide is added to the sealing solution, then corrosion resistance is improved, but the graphene particles precipitate and aggregate over time, losing their functional properties
Solution Approach 1:
The patent changes the chemical state of graphene from reduced graphene oxide (RGO) to hydroxyl graphene. This parameter change in chemical composition and surface properties enables the graphene to maintain stable dispersion in the sealing solution without precipitation, while still providing enhanced corrosion resistance. The hydroxyl groups on the graphene surface improve compatibility with the aqueous sealing solution matrix.
Solution Approach 2:
The patent introduces a silane coupling agent as an intermediary substance that mediates between the hydroxyl graphene and the sealing solution matrix. This coupling agent prevents aggregation of graphene particles by forming a protective interface, ensuring uniform distribution and stable suspension of graphene throughout the sealing solution over time.
2Stability of the object's composition
If surfactant is added to emulsify reduced graphene oxide, then dispersion is improved, but the surfactant adsorbs onto silica sol and methyl silicone resin particles, preventing effective crosslinking and reducing sealing film performance
Solution Approach 1:
The patent removes the surfactant component from the sealing solution formulation entirely. By using hydroxyl graphene with inherent hydrophilic properties, the need for external surfactants is eliminated, avoiding the harmful side effect of surfactant adsorption on silica sol and methyl silicone resin particles that would otherwise prevent effective crosslinking.
Solution Approach 2:
The hydroxyl graphene serves its own dispersion function through its inherent hydroxyl groups that provide hydrophilicity and compatibility with the aqueous sealing solution. This self-service capability eliminates the need for external surfactants and prevents interference with the crosslinking reactions of other sealing solution components.
3Ease of operation
If the composite sealing agent is diluted with water to formulate a sealing solution, then ease of application is improved, but the reduced graphene oxide aggregates and precipitates from the solution
Solution Approach 1:
The patent changes the chemical structure of graphene to hydroxyl graphene, which has improved hydrophilicity and water compatibility. This parameter change allows the sealing solution to be diluted with water for easy application while maintaining stable suspension of graphene particles without aggregation or precipitation.
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 hydroxyl graphene-modified sealant forms a high-strength sealing film with improved corrosion resistance, self-healing properties, and uniform distribution, significantly increasing the durability of zinc-nickel alloy and zinc coatings.
Implementation Method 1
the resist is a nanoscale hydroxyl graphene aqueous solution... which allows for uniform distribution and dehydration condensation
Implementation Method 2
The resist is a nanoscale hydroxyl graphene aqueous solution comprising hydroxyl graphene... and having a pH of 8.0 to 9.5
Data Source
AI summary
A hydroxyl graphene-modified plating sealant and a preparation method thereof are disclosed. The plating sealant comprises a film-forming material, a resist, a defoaming agent, a levelling agent, and deionized water; the resist is a nanoscale hydroxyl graphene aqueous solution comprising hydroxyl graphene having a mass fraction of 3.5% to 4% and a pH of 8.0 to 9.5. Nanoscale hydroxyl graphene is used as a resist in the plating sealant of the disclosure, then the hydroxyl groups on hydroxyl graphene can react with the hydroxyl groups of the film-forming material, i.e. silica sol and the silane polymer, by dehydration condensation, thereby significantly improving the performance of the sealing film. The sealing film has higher corrosion resistance and abrasion resistance compared with that prepared by graphene or reduced graphene oxide sealant.