In medical technology, aluminium has a very high utility value as a basic material or alloy, which is due to its low weight. During anodising and hard anodising, the surface finish grows into the workpiece.Despite the low process temperatures, these processes - which occur with precisely defined dimensional changes - create extremely strong bonding forces between the surface finish and the basic material. HART-COAT® by Aalberts surface treatment is a hard-anodised coating characterised by extremely fine pores, exceptionally high durability, excellent resistance to corrosion and hardness values of up to 480 HV0.025. HART-COAT® is used, for instance, to coat fixed-angle rotors of microlitre centrifuges.These devices can be found, for example, in blood banks and clinical laboratories where blood and other bodily fluids are centrifuged. In the research area, these centrifuges are used for the extraction of DNA, proteins and enzymes.For weight reduction purposes, fixed-angle rotors are manufactured from aluminium alloys. With a thickness of 40 µm, this hard-anodised layer protects components against corrosion.