Partial Hot Compaction of Anodized Aluminum Surfaces
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Solution Overview
Problem
Existing methods for producing high-quality thin ceramic coatings on aluminum or aluminum alloys fail to achieve cost-effective production while maintaining corrosion resistance, especially at high alkali pH values, without compromising other surface properties like weather and scratch resistance.
Innovation Solution
A method involving partial hot compaction of an anodically oxidized aluminum or aluminum alloy surface, followed by application of a material containing organosilicon network formers and subsequent hardening at temperatures up to 250 °C, which retains high porosity and enhances alkali resistance without altering the surface's positive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anodized surface is fully hot-compacted to seal pores for corrosion resistance, then alkali resistance improves, but surface porosity decreases and coating adhesion capability is lost
Solution Approach 1:
The patent applies partial hot-compaction by treating the anodized surface with hot water at temperatures of 90-100°C for a controlled duration, achieving partial pore sealing rather than complete closure. This partial action retains sufficient porosity for coating adhesion while providing adequate alkali resistance, resolving the contradiction between full sealing and porosity maintenance.
Solution Approach 2:
The patent optimizes hot-compaction parameters including water temperature (90-100°C), treatment time, and pH conditions to achieve the desired balance. By carefully controlling these parameters, the process achieves sufficient pore sealing for alkali resistance while maintaining the porous structure needed for subsequent coating adhesion, thus resolving the contradiction through parameter optimization.
2Reliability
If conventional full hot-compaction is applied to seal the oxide layer, then corrosion resistance improves, but production time increases
Solution Approach 1:
The patent employs partial hot-compaction instead of conventional full compaction, using optimized treatment conditions (hot water at 90-100°C with controlled time) that achieve sufficient corrosion protection without requiring extended treatment durations. This partial action approach significantly reduces production time while maintaining adequate corrosion resistance.
Solution Approach 2:
The patent modifies hot-compaction parameters including elevating water temperature to 90-100°C and optimizing treatment time to achieve faster pore sealing. These parameter changes accelerate the compaction process, reducing production time while maintaining effective corrosion resistance, thus resolving the contradiction between reliability and productivity.
3Strength
If high hardening temperatures are used to cure the organosilicon coating, then coating strength improves, but visual changes and detachment occur on the aluminum surface
Solution Approach 1:
The patent optimizes the hardening temperature parameter to a specific range that achieves sufficient coating cross-linking and adhesion without causing surface damage. By carefully controlling the temperature within this optimized range, the process achieves strong coating strength while preventing visual changes and detachment, thus resolving the contradiction between strength and surface appearance.
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 method achieves excellent alkali resistance up to pH 13.5, maintains corrosion resistance to salt and acid, and passes rigorous tests like salt spray, acid-heat-alkaline resistance, and temperature resistance, while preventing visual changes and detachment of the protective layer.
Implementation Method 1
the anodically oxidized surface is only partially hot-sealed
Implementation Method 2
subsequently hardened at a temperature of up to 250 °C
Data Source
AI summary
The invention relates to a process for treating an anodically oxidized surface of aluminium or an aluminium alloy by means of a wet chemical process, wherein the surface of aluminium or the aluminium alloy is pretreated, anodically oxidized, flushed and partially subjected to hot compacting. The present invention also relates to a corresponding aluminium surface obtainable, in particular, with the aid of the process according to the invention.