Fluorosilane Coating for Titanium Corrosion and Stain Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
PVDF coatings face issues such as rusting when damaged, require high processing temperatures, and have low hardness and stain-repellency, making them difficult to clean and prone to discoloration or deformation on titanium sheets, and they do not meet anti-graffiti criteria effectively.
Innovation Solution
A matte clear anti-fouling anti-corrosion surface coating comprising fluorine-modified polysilazane and a solvent, which is applied directly to metals, providing stain repellency, hydrophobicity, and corrosion resistance while being cured at room temperature or in a factory, without altering the original gloss or color, and preventing chalking of underlying coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVDF fluoropolymer coating is used for outdoor applications, then durability and erosion resistance are improved, but the coating requires high temperature processing (240-300°C) which causes discoloration or deformation of titanium sheets
Solution Approach 1:
The patent changes the processing temperature parameter from high (240-300°C for PVDF) to low (room temperature or below 100°C for fluorosilane coating), enabling application on temperature-sensitive substrates like titanium while maintaining coating durability and erosion resistance
Solution Approach 2:
The patent uses a composite fluorosilane coating formulation combining fluorinated compounds (for durability and erosion resistance) with silane components (for adhesion and low-temperature curing), achieving PVDF-level reliability without high-temperature processing
2Reliability
If PVDF fluoropolymer coating is applied on galvanized steel sheet, then corrosion resistance is improved, but the damaged area will rust
Solution Approach 1:
The fluorosilane coating is applied as a preventive top layer over the PVDF priming coat, creating a preliminary protective barrier that prevents rust infiltration to the underlying metal even when the top surface is damaged
Solution Approach 2:
The two-layer composite system combines PVDF (for base corrosion resistance) with fluorosilane (for enhanced surface protection and self-healing properties), where the silane component can repolymerize to seal minor damages and prevent rust propagation
3Reliability
If PVDF fluoropolymer coating is used, then weather resistance is improved, but the surface hardness is low (only about HB hardness) making it difficult to clean
Solution Approach 1:
The fluorosilane coating combines fluorinated compounds (providing weather resistance and non-stick properties) with silane cross-linked network (providing enhanced surface hardness), achieving both weather durability and cleanability that PVDF alone cannot provide
Solution Approach 2:
The patent changes the surface hardness parameter by introducing silane cross-linking chemistry, transforming the soft PVDF surface into a harder fluorosilane surface while maintaining weather resistance through fluorinated compound properties
4Reliability
If PVDF fluoropolymer coating is applied, then erosion resistance is improved, but the water contact angle is about 80-90 degrees and sliding angle is about 40-50 degrees, resulting in low stain-repellency
Solution Approach 1:
The patent changes the surface energy parameters by introducing fluorinated compounds with highly fluorinated alkyl groups, increasing the water contact angle and decreasing the sliding angle to achieve superior stain-repellency while maintaining erosion resistance
Solution Approach 2:
The fluorosilane composite combines the erosion resistance of PVDF with the enhanced hydrophobicity of fluorinated silane, creating a surface with both high durability and superior stain-repellency properties
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 coating significantly enhances hydrophobicity and salt spray resistance, prevents rusting, and allows for easy cleaning, maintaining the original appearance and durability of the metal surface while being resistant to temperature changes and impact.
Implementation Method 1
The water contact angle (hydrophobic angle) and the sliding angle of PVDF is about 80-90 and about 40-50 degrees, respectively
Implementation Method 2
A reactive diluent or a crosslinking agent may be added to the composition before use. The composition can be cured at room temperature or at an elevated temperature.
Implementation Method 3
PVDF is primarily used in applications requiring repellency to solvents and resistance to acid and base corrosion
Implementation Method 4
PVDF fluoropolymer coating as the weather-resistant material has the advantages of durability and erosion resistance, and will not fade or deteriorate regardless of the sunlight or rain
Data Source
AI summary
A matte clear anti-fouling anti-corrosion surface coating and uses thereof, and a matte clear anti-fouling anti-corrosion surface layer and a matte clear anti-fouling anti-corrosion metal, wherein the matte clear anti-fouling anti-corrosion surface coating comprises: a fluorine-modified polysilazane and a solvent, wherein the content of the fluorine-modified polysilazane is approximately 5-80% by weight based on the total weight of the matte clear anti-fouling anti-corrosion surface coating. Accordingly, the coating can be applied to a corrosion-prone metal sheet or a corrosion-prone metal plate with a protective priming coat (a coated object). The coating is stain repellent, hydrophobic, anti-graffiti, corrosion resistant, clear, matte clear, resistant to temperature changes, resistant to impact, and tough among other characteristics, and is capable of not changing the original color or gloss of the coated object; the coating can be cured at room temperature for direct uses outdoors, and/or can be heated and cured for uses in factories. Additionally, the coating can also be applied directly on a surface of a metal that is not susceptible to rusting, wherein the coating can be applied directly after the addition of a matting agent, or without the addition of a matting agent and the coating can still be matte clear as described above.