Our Services

Hard & Colour Anodising

Anodising was first developed by Russian scientists to produce a metal surface tough enough for space travel. The same technology is now used by ALU-FIN. Through a process of electrolysis at sub-zero temperature using a high intensity electric current, 10 to 100 micron thick layer of aluminium oxide (Al2O3) as per requirement is formed molecule by molecule as an integral part of the metal. This process produces a surface harder than steel.
Anodising is the general name applied to methods of treating metals, where the work piece is made the anode in an electrolytic cell, usually to form oxide coatings for the purpose of increasing the performance of the surface.
In the case of aluminium, the anodising process forms a layer of aluminium oxide - Al203 - or corundum, which is very hard, relatively inert, electrically insulating and can absorb dyes to colour the film.
The anodic film itself grows at the aluminium / aluminium oxide interface by the continuous formation and dissolution of a layer of oxide, this is the so-called barrier layer and its thickness is a function of the process starting voltage. A porous, more structured layer forms on top of the barrier layer making up the rest of the coating.

Types of Anodising we offer

❖ Hard Anodising ( Hard Coat AF)
❖ Semi Hard Anodising ( Semi Hard AF)
❖ Natural Anodising ( Natural AF)
❖ Colour Anodising ( Colour AF)
❖ Hard Anodising on Casting ( Hard Cast AF)
❖ Hard Anodising with PTFE impregnation ( Hard Impregcoat AF)
❖ Other special Anodising techniques as per customer requirements
❖ Hard Anodising with for special surface roughness with corrosion resistance (Hard Oxal AF)

Advantages of Hard Anodising

❖ Excellent thermal conductivity.
❖ Good malleability and ductility.
❖ Imparts a surface as hard as some gemstones.
❖ Increase in the surface hardness up to 1000 V.P.N.
❖ Excellent lubricating properties especially for continuously moving parts.
❖ Excellent corrosion and abrasion resistance.
❖ Enhancement of working life.
❖ The Hard Anodised surface is non-toxic, non-staining and non-reactive with foods. It is thermal-efficient, heats fast and evenly and is not spoiled by high heat. It is tough and durable, will not tarnish or corrode and will stay looking new for years.

Hard Anodising Highlights

❖ We are specialised in Hard Anodising since more than 40 years with some special Hard Anodising technologies where we can give Hard anodising on Aluminium for extreme applications and we can offer higher thickness of Hard anodising layer with 1000 VPN of hardness on aluminium substrate

❖ Our Special Hard Anodising process on Aluminium castings can offer continuous hard anodised layer on aluminium die casted parts with good hardness and corrosion resistance using special Additive Chemicals & Power supplies with AC superimposed on DC special waveforms.

❖ Our new Hard Anodising with PTFE impregnation process offers extended corrosion resistance with good Coefficient of friction values for typical dry lubrication applications

❖ Some new developments in Hard Anodising process which offers better surface roughness after anodising compared to regular hard Anodising process

Note : Please note all above processes are formulated as per special requirements , compatibilities and applications for aluminium jobs with our experience and know how from international associations. For further queries related above processes and technical discussion please feel free to contact us on mandar_gholkar@hotmail.com, mandargholkar@alufingroup.com, nilay_gholkar@hotmail.com.