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Hard and semi-hard anodizing of aluminum
(thicknesses from 25 to 150 microns)
The hard anodizing treatments are aimed at those details, generally intended for industrial use, which have high precision and reliability objectives. In fact, the hard anodic oxidation of aluminum gives the particular characteristics of high surface hardness, as well as resistance to corrosion, friction, thermal and chemical resistance. For these reasons hard anodizing is a widely used treatment in many fields, from mechanical to motorcycle and automotive, from textiles to military and aeronautics.
Hard anodic oxidation treatments for aluminum thickness
The standard treatment does not include any coloring, therefore the final aesthetic aspect of the detail will vary in reaction to the alloy used and the standard of thickness required. In the case of use of Ergal alloy (Al 7000 alloy) the finish will range from golden bronze to dark bronze; for the Anticorodal alloys (Al 6000 alloy) the final result will go from a pearly gray to anthracite or with a greenish tint. The Peraluman alloys ( alloy Al 5000) result in shades of gray. This depends on the different reaction of the chemical compositions to the alloys. As regards the application possibilities of hard anodizing, it is carried out on all aluminum alloys with Cu <2.5% and reaches a thickness from 25 to 150 microns.
Other HARD anodic oxidation treatments with aluminum thickness
With the treatment of hard anodic oxidationit is possible to improve the resistance of surfaces in aluminum alloys. In addition to this type of process, Minicolor also offersother aluminum hard oxidation treatments, among which:
Hard colored anodizing: in the phases of the hard anodizing treatment, the aluminum detail is subjected to coloring based on organic pigments. In this way, the detail, in addition to having all its functional characteristics, is also appreciable from an aesthetic point of view;
Hard oxidation with PTFE impregnation: if the part must have non-stick and smoothness characteristics, the hard thick anodization treatment is followed by the PTFE impregnation treatment. The non-stick PTFE polymer is incorporated in the anodic layer thus ensuring a low friction coefficient and low wettability. It is the ideal process for parts used in sliding action, friction, in contact with ferrous materials, with liquid components or with high adhesiveness such as glues, paints, etc. The PTFE impregnation can also follow the colored hard anodization treatment.
Semi-hard oxidation with natural and pigmented thickness: the applications of this treatment are very wide since, while maintaining high characteristics of resistance to corrosion and contact, it considerably lowers the micro-fracture point of the anodic layer. The anodic layer, more flexible, has greater resistance when subjected to torsion or tension stresses. Using semi-hard pigmented oxidation also ensures great aesthetic quality to the material. The thicknesses normally achieved range from 20 to 50 microns.
Hard and semi-hard anodizing of aluminium: why turn to Minicolor
Minicolor carries out in Brescia hard and semi-hard anodizing treatments for aluminum on the basis of customer specifications and in compliance with the ISO 10074:2017, UNI 7796:2010 standard and the MIL-A-8625F type standard III class 1 and 2 offering the following benefits:
High corrosion resistance;
Maximum thermal and chemical resistance;
High resistance to wear and friction;
Versatility of use (thicknesses from 20 to 150 microns, surface hardness from 350 to 1000 HV);