Aluminum Alloy Section Composite Film Coating for Marine Corrosion
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Solution Overview
Problem
Current aluminum alloy section products face issues with monotonous color options and poor weather resistance due to electrolytic oxidation, and chemical conversion treatments used in organic paint spraying are hazardous and lack ideal corrosion resistance.
Innovation Solution
A manufacturing method involving pre-treatment, anodizing, anodic electrophoresis, low-temperature curing and roasting, and fluorocarbon paint spraying with a primer containing acrylic and fluorocarbon resins to form a composite film coating, ensuring adhesion and enhanced corrosion and weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrolytic oxidation with metal salt solution is used for coloring, then color decoration function is achieved, but weather resistance deteriorates due to color fading from oxidation
Solution Approach 1:
The patent divides the surface treatment into separate functional layers: anodizing layer for color, intermediate layer for adhesion, and fluorocarbon coating for weather resistance. Each layer performs its specific function without interfering with others, solving the contradiction between coloring capability and weather resistance.
Solution Approach 2:
The patent uses composite coating structure combining anodized aluminum oxide layer with fluorocarbon polymer coating. The composite structure integrates the coloring function of metal oxide with the weather resistance of fluorocarbon, achieving both color decoration and excellent weather resistance.
2Reliability
If chromating or phosphochromating is used for chemical conversion, then corrosion resistance and paint adhesion are improved, but environmental safety deteriorates due to hypertoxicity
Solution Approach 1:
The patent extracts and removes the toxic chromating/phosphochromating processes from the surface treatment sequence, replacing them with non-toxic anodizing and fluorocarbon coating processes that achieve the same protective function without environmental harm.
Solution Approach 2:
The patent replaces expensive and toxic chemical conversion films with a more sustainable approach: the anodized oxide layer serves as both color carrier and corrosion barrier, while the fluorocarbon coating provides long-term protection, eliminating the need for toxic intermediate conversion layers.
3Shape
If zirconium-titanium conversion film is used, then transparency is achieved, but corrosion resistance deteriorates due to inability to intuitively determine film quality
Solution Approach 1:
The patent uses the natural coloration properties of anodized aluminum oxide layers to provide visual indication of film formation and quality. The interference colors that develop during anodizing serve as built-in quality control, eliminating the transparency issue while maintaining corrosion resistance.
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 produces an aluminum alloy section with excellent weather resistance and corrosion protection against ultraviolet rays and corrosive saline ions, suitable for marine climate conditions.
Implementation Method 1
anodizing the pre-treated aluminum alloy section base material to form an oxidation film on the surface of an aluminum alloy section
Implementation Method 2
carrying out anodic electrophoresis treatment on the aluminum alloy section base material to form an electrophoresis paint film on the surface of the aluminum alloy section
Data Source
Figure 1~2
AI summary
An aluminum alloy section and a manufacturing method therefor. The manufacturing method comprises: (1) pre-treating an aluminum alloy section base material (1); (2) anodizing the pre-treated aluminum alloy section base material to form an oxidation film (2) on the surface of an aluminum alloy section; (3) carrying out anodic electrophoresis treatment on the aluminum alloy section to form an electrophoresis film (3) on the surface of the aluminum alloy section; (4) curing and roasting the aluminum alloy section; and (5) spraying a fluorocarbon coating to the surface of the aluminum alloy section to form a fluorocarbon coating. The production process of the manufacturing method is stable and feasible. The surface of an aluminum alloy section product produced by using the manufacturing method has a special composite film protective coating, and accordingly the aluminum alloy section product has excellent performances such as corrosion resistance and weather resistance, and can effectively resist the corrosion destruction effect on the aluminum alloy section by ultraviolet light, high humidity and corrosive saline ions. Therefore, the aluminum alloy section is particularly suitable for buildings in islands and seaside regions under marine climates.