Magnesium PEO

OX-UHA is an innovative PEO (Plasma Electrolytic Oxidation) anodizing treatment for magnesium alloys which permits obtaining extraordinary characteristics of protection from corrosion and wear.

Main properties of PEO anodizing


Excellent wear resistance
Unlike traditional anodizing treatments, the OX-UHA process uses high currents which create a plasma on the piece surface. The micro-melting is thus obtained of the oxide layer which mineralizes and compacts, thereby increasing hardness and wear resistance.

Excellent corrosion resistance
The compact layer of ceramic oxides protects the magnesium from corrosion in many aggressive environments, providing increased protection compared to traditional magnesium anodizing or chrome treatments.

Environment friendly, Cr6+
free The process does not require the use of toxic chemical substances nor hexavalent chrome and therefore has a very low impact on the environment and human health.

Paintable
Thanks to the surface morphology, it ensures excellent adherence and can be subsequently painted. The combination of OX-UHA and painting permits obtaining very high corrosion resistance.

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Technical sheet

Technical specifications

Composition and applicable standards

Composition
The OX-UHA treatment transforms the base magnesium into a compact layer of magnesium and aluminium oxides.
Mg O Al P Impurities
35÷45% 40÷50% 5÷15% 3÷7% Depending on the alloy

RoHS Conformity
RoHS conform. No restricted-use substances beyond maximum tolerated concentrations.

REACh Conformity
REACh conform. No SVHC in quantities greater than 0.1% by weight.

Anodizable alloys

Anodizable alloys
Magnesium alloys
All commonly used magnesium alloys

Coating thickness and aesthetic appearance

Coating thickness
Standard thickness Tolerance
10µm ±5µm
Thickness varies according to part geometries. Thickness is reduced in holes and internal areas.

Aesthetic appearance
Matt white colour. Surface roughness increases by about Ra 0.8-1.0.

Tribological properties

Hardness
The surface hardness of the OX-UHA varies according to the type of treated alloy.
Hardness value Alloy
500±100HV AZ61

Wear resistance
Thanks to the extra hardness of the layer, the OX-UHA treatment provides high wear resistance, superior to any other magnesium alloy treatment.

Chemical properties

Corrosion resistance
The compact layer of oxides of the OX-UHA treatment permits obtaining high corrosion resistance, superior to that provided by chrome coated magnesium alloys or by standard anodizing processes.
Approximate corrosion resistance value Alloy
NSS according to ISO 9227 - thickness 10 μm - corroded surface < 5%
≥240 hours AZ61

Chemical resistance
Approximate values of compatibility with the coating environment. The actual resistance to the environment must in any case be tested in the field.
Hydrocarbons (e.g. petrol, diesel fuel, mineral oil, toluene)
Alcohols, ketones (e.g. ethanol, methanol, acetone)
Neutral saline solutions (e.g. sodium chloride, magnesium chloride, brine)
Diluted reducing acids (e.g. citric acid, oxalic acid)
Oxidizing acids (e.g. nitric acid)
Concentrated acids (e.g. sulphuric acid, hydrochloric acid)
Diluted bases (e.g. diluted sodium hydroxide)
Oxidizing bases (e.g. sodium hypochlorite)
Concentrated bases (e.g. concentrated sodium hydroxide)

Production facility