November 29, 2018


27 Feb Def Stan Def Stan Def Stan Specification for Composition Limits of Chemical Lead. Method for Vickers Hardness Test and. Find the most up-to-date version of DEF STAN at Engineering 28 Oct Def Stan Process M Passivation, Stainless Steel Passivation Def Stan 26, Hard Anodising, This was superseded long ago by BS.

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There are a number of limitations associated with Sulphuric Anodising:. Restrictions on types of aluminium suitable for hard anodising. We can carry out basic masking of components to prevent individual surfaces or holes from being anodised. Moving parts in machinery for packaging systems and general engineering applications.

For example, hard anodised series alloys will have a dark grey colour in a natural finish, whereas series alloys will give a light sandy colour finish. Hard Anodising Hard anodising is primarily a functional surface finish applied where aluminium components require increased wear resistance and surface hardness.

This process is then stqn with the asking reversed. Colours will tend to be darker and will vary widely between alloys such as and series alloys. We offer tank sizes up to 8′ x 5′ x 3′. Ideal for the production of hard wear-resistant surfaces on aluminium for aircraft and general engineering uses. If uncertain as to suitability of your aluminium please call.

Metal Finishings Ltd

Deep sea components which are subject to harsh salt water environments. Natural hard anodised series alloy. Hard anodising is primarily a functional surface finish applied where aluminium components require increased wear resistance and surface hardness.

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The resulting anodic film has more uniform crystalline structure which gives the increased hardness. Hydraulic systems, valves, pumps and pulleys.

Masking can be undertaken to restrict the hard anodising to the waer resistant surfaces such as cylinder bores. Hard anodising also provides a high degree of electrical insulation.

Hard Anodising

We have specialist chilling equipment and a modern pulse rectifier to achieve these conditions. 03-2 of hard blue and hard black anodised components Natural hard anodised series alloy Natural hard anodised series alloy. This is usually performed to maintain areas of electrical conductivity for earthing purposes. This process usually involves the sulphuric or chromic anodising of the non critical areas with the stopping off of the areas to be hard anodised.

Key strengths of hard anodising include: It is worth calling us at the design stage Finished surface rougher than original, therefore higher quality surface roughness required of original than desired hard anodised finish Sharp edges should be radiused before processing as there cef always the risk of thinning, chipping or flaking of the film under high impact load, particularly on alloys with a high zinc or magnesium content Applications: Edges of items to be hard anodised need to be radiused.

Machinery, hydraulics and tooling. Not suitable for free cutting aluminium. Maximum Size Criteria The table below outlines the maximum size criteria 0326 hard anodising: The use of loose, sliding or intermittent contacts will result in an unsatisfactory connection and give rise to faults such as thin coatings, burning at the contact points or even failure to obtain an anodised coating.

Correct jigging is essential to the resulting finish, and good jig points are required, a consideration that should be made at the design stage of a component. We offer a fast turn around because of the large size of our tanks. Blind holes will receive a much lower coating thickness which decreases with depth.


The hard anodising process uses sulphuric acid at a higher concentration than for normal anodising but it is carried out at a solution temperature close to 0 o C drf a significantly higher voltage being applied.

Metro Plating – Hard Anodising To DEF STAN – Surface Finishing For Wear Resistance

Colour matching is more difficult with a hard anodised component. These differing natural coating colours will clearly influence the final colour of any components which require dyeing after hard anodising and it is usually appropriate for us to provide a colour sample for approval before production batch sizes are processed.

Restrictions There are a few considerations to be aware of when considering hard anodising. Hard anodising ddef impair the surface finish, so surfaces to be treated should have a finish superior to that required on the processed item.

There are a number of limitations associated with Sulphuric Anodising: Examples of hard blue and hard black anodised components Natural hard anodised series alloy. Choice Of Alloys The colour and appearance of hard anodised components varies significantly depending on the alloy used.

If these apply then maybe semi-hard anodising would make a suitable alternative. Typical applications for hard anodised components are: