Spark Anodizing

Spark anodizing is a special process for the surface treatment of metals, in particular aluminium and its alloys. It is a further development of conventional anodizing, which is usually used to create an oxidic protective layer on aluminium. In contrast to the conventional method, in which the workpiece is immersed in an electrolyte bath, spark anodizing is carried out in the open air, allowing larger parts and even entire assemblies to be processed.

The spark anodizing process uses high-voltage discharges to create a very dense and uniform anodizing layer on the surface of the metal. The workpiece is connected with negative polarity and placed in an ionized air atmosphere. Applying a high voltage between the workpiece and a positively charged electrode creates electrical discharges or "sparks" that jump to the surface of the metal. This leads to rapid oxidation of the surface, creating a very hard and resistant anodized layer.

The advantage of spark anodizing is the ability to efficiently process large parts or assemblies without the need for complex fixtures or baths. This makes the process particularly attractive for the automotive and aerospace industries, as well as other industries where large aluminum parts are used. The anodizing layer produced provides excellent corrosion resistance, wear resistance and an attractive surface appearance, which improves the service life and performance of the treated components.