Anodising

Our processes in detail

Processes

Anodising

  • 2 fully automated anodising lines
  • 1 x anodising line for titanium rack / piece anodising
  • 1 x anodising line for panel material
  • Paint baths for standard colours black / bronze / red / green / blue / brown
  • Specially designed frames for piece anodising
  • Contact via busbars on racks
  • Contacting of parts via drilled holes or outer edges
  • Entire racks can be treated

Aluminium in its raw state reacts in the air and forms an uncontrollable, often unwanted, unattractive oxide layer due to a reaction with oxygen or weather-related influences. You can read how to prevent this here.


Anodising
, short for electrolytic oxidation of aluminium,
is a method of producing a protective layer in a controlled manner. This protective layer is achieved by anodic oxidation. This is not, as is often thought, a layer being applied. In fact, the uppermost aluminium layer of the part to be anodised is transformed and an oxide is formed. This thin oxide layer can be created from 12 to 25 µm (microns) depending on the customer's requirements. It protects its aluminium part from corrosion as long as there is no surface damage caused by scratches or similar.

EV1 anodising is one of the standard anodising processes. An oxide layer in the range of 12 to 25 µm is created on the aluminium to be treated simply by anodic oxidation. This is colourless and transparent depending on the aluminium alloy, but can also have a slight yellowish shimmer. It often only serves as a technically functional protective layer in addition to its surface hardening, corrosion and weathering resistance, wear resistance and electrical insulation properties. Small scores and unevenness caused by the production and/or processing of the workpiece can be levelled but not completely removed due to the possible pre-treatment of light (up to 6 minutes) or strong (up to 25 minutes) pickling. This process is mainly used by tool, mould and machine manufacturers, turning shops, milling shops, manufacturers of building hardware and medical technology, etc. to protect their workpieces. However, the EV1 surface, also known as EURAS C-0, is also used as a decorative surface in the building industry, in the automotive industry, for household appliances, lamps and furniture fittings, in the production of signs, etc.
The first step is often surface treatment of the aluminium parts, e.g. pickling, grinding. This first treatment produces matt to high-gloss surfaces, which are then dyed and anodised in the second step, or if no colour is desired, anodised directly.

The German DIN 17611 recommends the designations listed in the aluminium data sheet O 4 published by the Gesamtverband der Aluminiumindustrie e.V., Düsseldorf.

DIN 17611 ( as of 11/2007) in connection with Aluminium data sheet O4 Designation according to EURAS Standard

EV1natural colourC-0colourless
EV2nickel silver lightC-31light bronze
EV3goldC-32bright bronze
EV4bronze mediumC-33medium bronze
EV5bronze darkC-34dark bronze
EV6black
C-35black
The Anodising Process 1. Mechanical pre-treatment sanding, brushing, sand blasting and polishing 6. Anodisation Unprocessed aluminium Al 2 O 3 Pores in the oxide layer Print into the open pores Sealed anodised protective layer Oxide protective layer 2. Chemical pre-treatment de-greasing and pickling 3. Water rinse 5. Water rinse 7. Water rinse 9. Water rinse 8. Dyeing mostly at high temperatures 10. Finish Sealing 4. Shine polishing (optional)

Applications Applications

  • For panels which are traded as whole boards
  • Anodised material is generally used for engraved signs.
  • Partially during milling or stamping, so that later reworking such as grinding can be omitted.

What Künkler offers

Our methods

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