Different Types of Aluminum Circles for Pan
Aluminum circle sheet is the most widely used cookware material in the world because of its light weight, fast heat conduction and easy processing and forming. The aluminum circle for pan occupies a high percentage of the raw material for non-stick pans.
The processing and forming methods of aluminum alloy pots and utensils are mainly divided into two kinds: deep drawing of deformed aluminum circle sheet and die casting. The most common aluminum alloy used for deep drawing is 3xxx aluminum, especially 3003 aluminum circle.
Stamping is the most common one and has the lowest cost. The Al-Mg alloy used in it has good corrosion resistance and is relatively stable under neutral conditions. Casting molding can realize all kinds of special-shaped pots. Casting alloy, because of its high silicon content, is weaker in corrosion resistance than aluminum deep-drawn pots.
There are bare aluminum pans in their true colors among aluminum pans, but they are relatively rare. The material of this type of aluminum pan is generally 3xxx aluminum discs. Surface treatment methods are generally polishing, sanding, whitening,etc.
Another major category of aluminum alloy is anodized type. Common anodic oxidation treatments include oxalic acid oxidation (natural hair color), sulfuric acid anodic oxidation (imitating porcelain), hard anodic oxidation and so on.
The stability of anodized aluminum circle under neutral conditions is much higher than that of bare aluminum. In the usual neutral salt spray test (NS) test, white rust (alumina hydrate) is not easy to appear for 192 hours. Bare aluminum has severe white rust in 8 hours.
However, under acidic conditions, especially organic acids (the acidic mimics for migration are acetic acid and citric acid), the corrosion rate of the oxide film is faster than that of bare aluminum. The test was conducted by boiling for 0.5 hours with Chinese standard 4% acetic acid and soaking for 24 hours. Therefore, aluminum alloy cookware with anodic oxide film should not be used to cook acidic foods.
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