Rzeszow, Poland

Poeton Polska SP. Z O.O.

Jasionka 954

36-002 Jasionka PPN-T

Aeropolis Podkarpackie Science & Technology Park

+48 17 773 69 01

TIN: PL 813 373 50 41

Gloucester, UK

Poeton Industries Ltd.
Eastern Avenue
Gloucester, UK


+44 (0) 1452 300 500

Cardiff, UK

Poeton Industries Ltd.
Penarth Road
Cardiff, UK
CF11 8UL

+44 (0) 2920 388 182

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Apticote 300 covers a range of anodising processes, including hard, sulphuric, chromic, tartaric sulphuric acid and boric sulphuric anodising. Each of these processes offers its own unique benefits, from maximising hardness to ensuring the highest levels of corrosion resistance and lowest impact on fatigue strength.

Anodising is an electrolytic process for aluminium alloys, which transforms the surface layer into aluminium oxide. Within an acid bath, the part becomes the anode and, utilising various metal cathodes, a closely controlled DC voltage is applied across them.


Hard anodising is distinct from sulphuric and chromic acid anodising in that the electrolyte is chilled. The thermodynamics are then such that a much thicker and harder coating is produced, one that provides wear resistance as well as corrosion protection.


The diagram below illustrates how the anodising process causes equal growth of the aluminium oxide layer both internally and externally.


Apticote 200 coatings exhibit a wide range of complementary properties and possible applications:

  • Gears and pulleys

  • Valve blocks

  • Hydraulics

  • Pneumatics

  • Pistons

  • Hinges

  • Swivel joints

  • Rod-ends

  • Food chutes

  • Nozzles and venturi

  • High hardness

  • Very low wear

  • Excellent corrosion protection

  • Precise coating thickness

  • Uniform coverage

  • Excellent paint adhesion

  • Coats a range of aluminium alloys

  • Can be dyed black or red


Anodising creates a micro-column structure. For maximum protection, anodised layers are usually sealed immediately after the main coating process, filling the micro-columns and preventing access to the substrate. Typical sealing techniques include: Hot water, Nickel acetate and Di-chromate (Aerospace only). It is also possible to infuse the layer with a polymer (see Apticote 350/355 information sheets).

Microsection of an anodic film showing cellular porosity