OX-A is a clear aluminium anodizing treatment in compliance with MIL-A-8625 Type II, and ISO 7599.
OX-A anodizing treatment is composed of an electrolytic aluminium oxidation process. It is performed by dipping the substrate in a sulphuric acid solution at 20°C and by applying direct electric current.
During the process, the surface of the aluminium part is transformed, creating a protective film of aluminium oxide with a typical thickness of 10-20µm.
The OX-A treatment protects treated parts against corrosion and wear. The corrosion resistance of parts anodized with OX-A passes 336 hours in salt spray in compliance with MIL-A-8625.
The treatment is used to protect automatic machinery components, in the medical field, home appliances, and industrial components.
The OX-A film protects the base material from corrosion, exceeding 336 hours of salt spray exposure in compliance with the requirements of MIL-A-8625.
The layer of aluminium oxide formed by the OX-A treatment makes it possible to achieve high scratch resistance and resistance to minor wear phenomena.
Compared to other aluminium anodizing treatments, OX-A is more economical thanks to the high efficiency process.
The OX-A treatment can be pigmented to create a deep black colour, thus allowing all aluminium alloys to be given the same appearance.
|The OX-A treatment transforms the aluminium substrate into a compact layer of aluminium oxide. The coating composition is thus strongly dependent on the starting alloy.|
|20÷40%||50÷70%||3÷5%||Depending on the alloy|
|MIL-A-8625 | Type II|
|RoHS compliant. No restricted substances present in amounts greater than the maximum tolerated concentrations.|
|REACH compliant. No SVHCs present in amounts higher than 0.1% by weight.|
|Containing high percentages of copper or zinc||Corrosion resistance||★★★☆☆|
|Other alloys||Corrosion resistance||★★★★★|
|Alloys with Si>8% or Cu>2%||Corrosion resistance||★☆☆☆☆|
|Die castings with Si<8% or Cu< 2%||Corrosion resistance||★★☆☆☆|
|Other alloys||Corrosion resistance||★★★☆☆|
|30% of the treatment thickness is due to external film growth and 70% is due to film growth in the surface of the aluminium part. The radial dimensional increase can thus be calculated as 30% of the treatment thickness.|
|Uniform thickness over the entire external surface. Reduced thickness in holes.|
|Semi-polished appearance with light grey colour. The colour depends on the base alloy. Reproduces the morphology of the machined part.|
|Option of black colouration in the OX-AN version|
|Resistance to moderate wear and scratches.|
To meet higher demands, OX-HS and OX-W treatments can deliver very high wear resistance.
|The OX-A treatment makes it possible to achieve high corrosion and oxidation resistance. Exceeds requirements for resistance to the accelerated salt spray corrosion test in compliance with MIL-A-8625F Type II.|
|Corrosion resistance value||Substrate material|
|NSS to MIL-A-8625F 18.104.22.168|
|≥336 hours||6000 alloy|
|Chemical compatibility values. The actual environmental resistance must anyway be tested in the field.|
|Hydrocarbons (e.g. petrol, diesel, mineral oil, toluene)|
|Alcohol, ketones (e.g. ethanol, methanol, acetone)|
|Neutral saline solutions (e.g. sodium chloride, magnesium chloride, seawater)|
|Dilute reducing acids (e.g. citric acid, oxalic acid)|
|Acid oxidizing agents (e.g. nitric acid)|
|Concentrated acids (e.g. sulphuric acid, hydrochloric acid)|
|Dilute bases (e.g. dilute sodium hydroxide)|
|Base oxidizing agents (e.g. sodium hypochlorite)|
|Concentrated bases (e.g. concentrated sodium hydroxide)|