Deoxidizing Composition and Epoxy Coating for Lap Shear Strength
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Solution Overview
Problem
Current protective coatings on metal substrates for corrosion resistance and paint adhesion are limited in effectiveness, particularly in achieving optimal lap shear strength and displacement, and often require additional pretreatment compositions like zinc phosphate or hexavalent chromium.
Innovation Solution
A system comprising a deoxidizing composition with Group IVA or IVB metals and free fluoride at a pH of 1.0 to 3.0, combined with a coating composition of epoxy-containing compounds and amine-functional adducts, which chemically react to form a durable film on the substrate, eliminating the need for conventional pretreatment compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pretreatment compositions (zinc phosphate or hexavalent chromium) are used, then corrosion resistance is improved, but environmental safety deteriorates and process complexity increases
Solution Approach 1:
The invention changes the chemical parameters of the pretreatment by using a deoxidizing composition with controlled pH (1.0-3.0) and specific metal content (Group IVA and/or IVB metals) instead of traditional zinc phosphate or hexavalent chromium formulations, achieving effective corrosion protection without harmful substances
Solution Approach 2:
The invention creates a composite protective system combining the deoxidizing composition with a two-component coating system (epoxy-containing compound + amine-functional adduct) that forms an integrated protective layer on the metal substrate, eliminating the need for separate pretreatment and coating steps
2Reliability
If conventional pretreatment compositions are used, then corrosion resistance is improved, but the number of process steps increases
Solution Approach 1:
The invention merges the pretreatment function and coating function into a single integrated system where the deoxidizing composition prepares the substrate surface and the two-component coating composition forms the protective layer in a streamlined process, reducing the number of separate process steps
3Reliability
If traditional protective coatings are applied, then basic protection is achieved, but lap shear strength is insufficient
Solution Approach 1:
The invention uses a two-component coating system where an epoxy-containing compound reacts with an amine-functional adduct to form a crosslinked composite coating structure that achieves superior lap shear strength (at least 30 MPa) compared to traditional single-component coatings
Solution Approach 2:
The invention optimizes the chemical composition parameters of the coating, specifically using epoxy-containing compounds and amine-functional adducts with controlled molecular structures and reactivity, to achieve enhanced mechanical bonding strength
4Reliability
If traditional protective coatings are applied, then basic protection is achieved, but displacement performance is insufficient
Solution Approach 1:
The crosslinked composite structure formed by the reaction between epoxy-containing compounds and amine-functional adducts provides enhanced flexibility and displacement capacity (at least 3.1 mm) while maintaining protective 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 system significantly enhances lap shear strength and displacement, achieving values of at least 30 MPa and 3.1 mm respectively, while eliminating the need for traditional pretreatment steps, and providing a robust protective coating.
Implementation Method 1
a deoxidizing composition comprising a Group IVA metal and/or a Group IVB metal and free fluoride, wherein the deoxidizing composition has a pH of 1.0 to 3.0
Implementation Method 2
a coating composition comprising: a first component comprising an epoxy-containing compound (E1); and a second component that chemically reacts with the epoxy-containing compound (E1)
Data Source
AI summary
Disclosed are systems for treating a substrate comprising a deoxidizing composition and a coating composition. The deoxidizing composition comprises a Group IVA metal and/or a Group IVB metal and free fluoride, optionally may comprise a homopolymer or copolymer comprising a phosphorous-containing monomeric subunit, and has a pH of 1.0 to 3.0. The coating composition comprises first and second components and elastomeric particles. The first component comprises an epoxy-containing compound (E1) and/or an epoxide-functional adduct (E2). The second component comprises a diamine and/or a polyamine comprising a cyclic ring (A2) and/or an amine-functional adduct (A3). The present invention is also directed to methods of making the compositions, methods of coating a substrate, and coated substrates.