Chromium-Free Grain-Oriented Steel Coating for Corrosion Insulation
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Solution Overview
Problem
Existing coatings for grain-oriented steel lack sufficient corrosion resistance and electrical insulation, often relying on environmentally harmful metals like chromium, and require mixing multiple components just before use, which complicates storage and application.
Innovation Solution
An aqueous composition containing aluminum cations, manganese cations, dihydrogen phosphate, hydrogen phosphate, and colloidal silicon dioxide, in specific molar ratios, providing a chromium-free, stable, and one-component coating that can be directly applied to grain-oriented steel, effectively sealing pores and offering excellent corrosion protection and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing coating materials are used, then corrosion protection is provided, but environmentally harmful metals like chromium are present and corrosion resistance is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by formulating a coating based on aluminum cations, manganese cations, phosphate anions, and colloidal silicon dioxide, completely eliminating chromium and other environmentally harmful metals while achieving superior corrosion resistance through optimized molar ratios and chemical interactions
Solution Approach 2:
The patent creates a composite coating material combining aluminum phosphate, manganese phosphate, and colloidal silicon dioxide in specific proportions, forming a multi-component protective layer that provides enhanced corrosion protection without using harmful metals
2Reliability
If multiple components are mixed just before use, then coating performance is achieved, but storage complexity and application complexity increase
Solution Approach 1:
The patent merges multiple coating components into a single stable aqueous composition where aluminum cations, manganese cations, phosphate anions, and colloidal silicon dioxide coexist in equilibrium, eliminating the need for separate storage and mixing operations while maintaining coating performance
Solution Approach 2:
The patent performs preliminary stabilization of the multi-component system during manufacturing, adjusting pH and ionic balances to ensure long-term storage stability, so that the composition remains ready-to-use for at least three months without degradation 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 composition forms a dense silicate and phosphate layer with hydrolysis resistance up to 1000°C, excellent adhesion, and sound wave damping, maintaining stability for at least three months without the need for immediate mixing, significantly improving corrosion resistance and electrical insulation compared to prior art.
Implementation Method 1
The composition forms a dense silicate and phosphate layer with hydrolysis resistance up to 1000°C, excellent adhesion
Implementation Method 2
colloidal silicon dioxide
Implementation Method 3
sound wave damping
Data Source
AI summary
The present invention relates to an aqueous composition for coating grain-oriented steel, comprising - aluminum cations, - manganese cations, - dihydrogen phosphate, hydrogen phosphate and/or phosphate anions, - colloidal silicon dioxide and - optionally iron cations, wherein the aluminum cations present in the composition, calculated as Al2O3, the manganese cations, calculated as MnO, the dihydrogen phosphate, hydrogen phosphate and/or phosphate anions, calculated as P2O5, colloidal silicon dioxide, calculated as SiO2, and optionally the iron cations, calculated as FeO, result in the molecular formula (Al2O3)2(MnO)1,8-2,4(FeO)0-0,2(P2O5)5-7(SiO2)≥30.