Organometallic Interlayer for Selective Coating Stripping
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Solution Overview
Problem
Current coating systems for aerospace applications face challenges in selective removal of post-coating layers without detrimental impact on the substrate's performance, including weight addition, reduced selectivity, and in-service performance degradation due to repeated stripping and recoating processes.
Innovation Solution
An organometallic layer formed from an organic polymer with multi-chelating functionalities and a metallic agent, applied between the substrate and post-coating layers, enables selective stripping while maintaining the integrity of the substrate and providing chemical resistance, mechanical properties, and aesthetics, with a dry thickness of 5 microns or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate coating layer or barrier layer is used to enable selective removal of post coating layers, then the selectivity of stripping is improved, but the weight of the coating system increases due to the additional layer thickness of up to 12 microns
Solution Approach 1:
The invention changes the chemical composition parameters of the organometallic layer by using specific organic polymers with multi-chelating functionalities and metallic agents in controlled molar ratios (1:1 to 1:10), enabling the layer to be both thin (5 microns or less) and highly selective for stripping. This parameter optimization allows selective removal while minimizing weight addition.
Solution Approach 2:
The invention creates a composite organometallic layer by combining organic polymers containing multi-chelating functionalities with metallic agents (oxides, hydroxides or salts of silver, copper, nickel, strontium, thallium, tin, titanium, vanadium, zinc, tungsten or zirconium). This composite structure provides both the necessary selectivity for stripping and mechanical integrity at reduced thickness.
2Object-affected harmful factors
If traditional intermediate coating or barrier layer techniques are used for selective stripping, then the underlying substrate is protected from stripper medium, but the in-service performance and chemical resistance are reduced due to tight application window tolerances and repeated stripping and recoating
Solution Approach 1:
The invention applies local quality by creating an organometallic layer with specific localized chemical properties - the layer has controlled chelating functionality and metallic agent distribution that provides selective stripper resistance only where needed at the coating-substrate interface, while maintaining the overall chemical resistance and mechanical properties of the coating system through proper formulation.
Solution Approach 2:
The invention optimizes formulation parameters including solid concentration (1% to 10%), molar ratio of metallic agent to chelating functionality (1:1 to 1:10), and layer thickness (5 microns or less) to achieve reliable in-service performance while maintaining protective functionality during stripping operations.
3Weight of stationary object
If the organometallic layer thickness is reduced to minimize weight, then the weight addition is minimized, but the selectivity and protective function may be compromised
Solution Approach 1:
The invention uses parameter optimization by controlling the solid concentration (1% to 10%), molar ratio (1:1 to 1:10), and thickness (5 microns or less) of the organometallic layer to achieve the counterintuitive result that a thinner layer with optimized composition provides equal or superior selectivity compared to traditional thicker layers, thereby minimizing weight while maintaining function.
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 organometallic layer allows for efficient and selective removal of post-coating layers, retaining the substrate's integrity and performance, while minimizing weight addition and ensuring chemical resistance and durability, thus optimizing the coating process for aerospace applications.
Implementation Method 1
an organic polymer containing multi-chelating functionalities; a metallic agent which forms an organo metallic complex with the organic polymer containing multi-chelating functionalities
Data Source
AI summary
The invention relates to a coating system, in particular a coating system containing an organometallic layer which allows the selective removal of post coating layers from substrates without detrimental impact to their "in-service" performance. The organometallic layer comprises (a) an organic polymer containing multi-chelating functionalities; and (b)a metallic agent which forms an organo metallic complex with the organic polymer containing multi-chelating functionalities and is located between an optionally coated substrate and at least one post coating layer of a coating system.