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Aluminum requires metal finishing to prevent oxidation. Standard finish is chromate conversion, which provides a corrosion resistant, conductive surface. Nickel plating is also highly conductive and has been shown to improve EMI shielding effectiveness. However, nickel is often found to be on restricted usage in many applications – particularly for external surfaces.  Anodizing is preferable for panels where overlays and painting are not used, and where conductivity is not required. Atrenne offers a range of metal finishing options, including:

Surface

Finish

Labeling

Conductivity

Grained or Brushed

Chromate

Add overlays

Conductive

Grained or Brushed

Nickel Plated

Add overlays

Conductive

Grained or Brushed

Anodized

Silk Screening or Overlays

Non-Conductive

Mill

Chromate

Add overlays

Conductive

Mill

Powder Coat paint

Silk Screen your design

Non-Conductive

Note:  All of Atrenne’s standard metal finishing options are RoHS compliant with the exception of the yellow (gold) chromate.

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Single or Multicolor; The perfect solution for a high quality aesthetic finish for your front panels or bezels; Atrenne can also provide a recessed gallery on aluminum front panels to accommodate the polycarbonate overlay – insuring the edges will not be exposed.

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The most cost effective labeling process for front panels and enclosures. From setup charges to minimum lot sizes – silk-screening offers the most affordable options. Silk-screening can be applied to Chromate, Anodized, or painted surfaces.

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Our in house powder coat process insures a high quality finish. Powder coat is a robust, hard finish- and is available in a range of textures. For special requirements – wet paint is also available upon request.

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For outside surfaces – anodizing provides a robust finish which helps to avoid fingerprints and other types of minor imperfections. Anodizing is non-conductive and should not be used on surfaces where gasketing is to be applied – or where EMI integrity is required.

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Chromating is applied to passivated metals including aluminum, zinc, copper, tin and their alloys to retard corrosion. Also known as alodine or chemical film – chromating is one of the most common processes used with aluminum front panels. Chromated surfaces are conductive and suitable for gasket application and EMI (electromagnetic interference) shielding requirements.

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The most common process for sheet metal front panels such as Stainless Steel. Passivation is a cleaning process which results in the generation of a thin, transparent oxide film to the stainless surface – which further enhances the corrosion resistant properties. Details of the process are outlined in ASTM A 380.

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This process is also known as brushing. The process involves brushes made of waved metal wires – which clean the surface of aluminum and eliminate extrusion lines, scratches, and marks. This process is done prior to any finishing process such as anodizing or chromating.

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For smaller components such as front panel handles, and hardware, overmolding is commonly required. Overmolding provides a surface which is easier to grasp and can improve the aesthetics. This finishing technique is available in a wide range of colors and materials to meet your requirements.

For more information about Atrenne’s metal design-build or value-add build-to-print capabilities, please contact us.

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