Quck answer
Polished and anodized aluminum are two different types of finishes commonly used for aluminum surfaces.
Polished aluminum has a glossy and reflective surface, achieved through a series of polishing processes that remove imperfections and create a smooth and shiny finish. It is often used for decorative purposes, such as in furniture, car parts, and household items. Polished aluminum requires regular maintenance to keep its shine.
On the other hand, anodized aluminum is a process that creates a protective layer on the surface of the metal. This layer is formed by immersing the aluminum in an electrolyte solution and applying an electric current. Anodized aluminum is known for its durability, corrosion resistance, and color options. It is commonly used in architectural applications, electronics, and automotive industries.
In summary, polished aluminum has a shiny and reflective surface achieved through polishing, while anodized aluminum has a protective layer formed through anodization, providing durability and color options.
Anodized aluminum is aluminum that has undergone a process involving chemicals and electricity, resulting in a controlled oxidation which creates a harder-than-steel and porous surface. This type of aluminum is easier to dye compared to plain aluminum. On the other hand, polished aluminum is aluminum that has been purified and polished to either a high gloss or brushed finish. Both types of aluminum are used in many similar pieces, making it challenging to tell them apart.
Step 1
Observe the texture of the metal. Anodized aluminum has a matte finish, while polished aluminum is the most reflective surface and can reflect more light than mirror glass. However, it is important to note that some polished aluminum may have a brushed finish, which can be difficult to differentiate from a matte finish.
Step 2
Check the color of the piece. If it is painted, try to scrape off a small amount of paint from an unnoticeable area. If the paint does not chip off, the aluminum has likely been dyed and is anodized. Only anodized aluminum has a porous surface that allows dye to seep in.
Step 3
Use a penny to scratch the surface of an unnoticeable portion of the metal. Polished aluminum is very soft and can be scratched by a penny. If the penny scratches the finish, then it is polished aluminum. However, if the penny leaves a streak of copper on the surface, then the metal is harder than copper and has been anodized.
FAQ
1. What is the difference between polished and anodized aluminum?
Polished aluminum refers to the process of making the surface of the aluminum smooth and shiny by using polishing compounds and tools. On the other hand, anodized aluminum is a process that involves creating a protective oxide layer on the surface of the aluminum through an electrochemical process.
2. How can I visually distinguish between polished and anodized aluminum?
Visually, polished aluminum will have a reflective and mirror-like surface, appearing smooth and shiny. Anodized aluminum, on the other hand, will have a more matte or satin-like finish, often with a slight texture and a colored or dyed appearance.
3. Does polished aluminum require more maintenance compared to anodized aluminum?
Yes, polished aluminum generally requires more maintenance as it is prone to fingerprints, smudges, and scratches. It may need regular cleaning and polishing to maintain its shine. Anodized aluminum, on the other hand, is more resistant to smudges and scratches, making it easier to maintain.
4. Which type of aluminum is more resistant to corrosion?
Anodized aluminum is generally more resistant to corrosion compared to polished aluminum. The anodization process creates a durable and protective oxide layer on the surface, which helps prevent corrosion and rust. Polished aluminum, without any protective coating, is more susceptible to corrosion.
5. Can the appearance of anodized aluminum be altered?
Yes, the appearance of anodized aluminum can be altered by using different dyes or colors during the anodization process. This allows for a wide range of color options, making it possible to match specific aesthetics or design preferences.
6. Is polished aluminum more expensive than anodized aluminum?
The cost of polished and anodized aluminum can vary depending on various factors such as the quality, finish, and supplier. However, in general, polished aluminum tends to be more expensive due to the additional labor and processes involved in achieving the polished finish.
7. Which type of aluminum is more commonly used in different industries?
Both polished and anodized aluminum have their own applications in various industries. Polished aluminum is often used in decorative or aesthetic applications, such as automotive trim or household appliances. Anodized aluminum, with its protective coating and durability, is commonly used in architectural, aerospace, and industrial applications where corrosion resistance is important.