Mill finish aluminum can however rust under certain pH ranges and constant exposure to moisture. Anodizing or painting is a popular way to enhance corrosion resistance.

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Polished finish aluminum can be achieved using a polishing liquid and buffing aluminum. Then aluminum makes a mirror-like shiny surface. Polished finish is used on decorations and accessories.

Anodized aluminum is a popular industrial material. China leads the global production of anodized aluminum and Wellste contributes to high-quality anodized aluminum products. So why is anodized aluminum so important?

Mill finish aluminum has a rough texture with visible die lines and marks. This isn’t a lack of quality but how a factory floor product looks. Mill finish is mostly further processed into extrusions, trims, and components. It is also used to make products like aluminum foils and soda cans where surface finish is not an issue.

Aluminum is not the best thermal conductor when compared with metals like copper but if your application requires thermal dissipation using aluminum, mill-finish aluminum is better as it has no oxide coating.

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Most of the time, the requirements and specifications dictate the choice. But what happens if you’re not an expert? What choices do you have when buying aluminum? And is mill-finish aluminum the right choice for your project?

Mill finish aluminum has visible manufacturing lines because it comes straight from the rolling mill. In the case of extruded raw aluminum, the surface marks and imperfections are similar.

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PVDF coatings are widely used in construction and you can spot them from their colorful range. PVDF doesn’t protect against wear and abrasion and is mostly done for aesthetics.

Mill finish aluminum is used to describe aluminum with no post-processing. The surface of the freshly extruded aluminum profile is a mill finish.

This enhances rust protection and prevents abrasive damage. Powder coatings can be chipped out revealing aluminum’s natural color.

Anodized aluminum has a chemically altered surface. The anodizing process is coating a micron-level thick protective layer that provides hardness, and abrasion resistance and prevents corrosion.

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Mill-finished aluminum has properties that depend on the type of aluminum being used. Since mill-finished aluminum is in its natural appearance, the mechanical and chemical properties come from particular alloys like aluminum 6061, aluminum 3003, and aluminum 1100.

PVDF is a layering of a fluoropolymer-based plastic on top of aluminum to give it a protective finish that is both colorful and glossy.

Anodizing can be used for many applications, like heatsinks, aluminum tubes, aluminum angles, window door profiles, and other anodized aluminum extrusions.

In straightforward terms, it rapidly increases the rate of natural oxidation and grows an aluminum oxide layer on the mill finish aluminum.

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To enhance the properties of aluminum like corrosion resistance, abrasion, and weather resistance you can have your aluminum products anodized. If you’re thinking anodizing aluminum will give it a particular color or yellowish hue, you can choose clear anodizing.

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Mill finish is also found in aluminum extrusions. In most extrusion products, in this case, raw aluminum rods are extruded through an extrusion die into desired aluminum extrusions with unchanged surface properties.

Brushed finishes are aesthetically sought after in architectural construction such as window panes or door locks, aluminum tubes, angle trims, etc. In the transportation industry with supporting rails in busses and subways, and automotive parts.

Mill finish is a factory floor product that is often further processed. So, mill finish typically has a rough texture. It’s dull in color compared to brushed and finished aluminum.

Powder coating is another popular protective coating with many colors. An electrostatically charged powder is sprayed onto aluminum surface that sticks to the freshly chromatid surface.

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The main principle of anodizing is the electrolytic process. The mill finish aluminum extrusions or aluminum trims are submerged into a temperature-regulated sulphuric acid bath. Here a current passes through the solution releasing oxygen atoms from the acid that combine with the aluminum to grow an oxide film on the mill finish.

Mill-finish aluminum is easier to form, melt and shape. It can undergo an extrusion process, and be turned into a variety of forms, disregarding the complexity that comes with coating intricate shapes.

Anodizing aluminum improves corrosion resistance, adds long-lasting color, and improves hardness, durability, and wear resistance.

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But brushed finishes go beyond just the aesthetics! Brushed-finish is given using an abrasive mesh that partly polishes the aluminium surface. Brushed finished aluminium doesn’t give reflections, prevents fingerprint stains, and is good at hiding regular scratches and imperfections.

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You might be used to a glossy aluminum finish, but natural finish aluminum lacks the shine and reflectivity associated with aluminium metal.

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This blog quickly covers the characteristics of mill-finish aluminum, discovers other types of aluminum finishes, and delves into comparing anodized aluminum and mill-finish aluminum.

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Brush finish is the linear or diagonal-grained finish visible on aluminum railings and surfaces. It is purely done for aesthetics to get an even surface finish and remove marks and spots.

The difference between brushed-finish aluminum and mill-finish aluminum is the directional grain and slight polish. Imperfections and marks are more easily spotted on mill finishes.

Aluminum is one of the few metals with a natural oxide layer. Aluminum gains corrosion resistance as a protective oxide layer forms upon exposure of the aluminum to air on its surface. The new oxide layer is tough and doesn’t break or flake like oxides of other metals.

Mill finish aluminum is the natural, untreated, unchanged aluminum surface from the rolling mill. The aluminum finish resulting from the extrusion process at aluminum mills characterizes extruded aluminum.

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Anodized coatings can be colored because they are porous and can entrap the dyes within their structures which are sealed by a final coating of Nickel acetate.