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at Engineering 28 Oct Def Stan Process M Passivation, Stainless Steel Passivation Def Stan 26, Hard Anodising, This was superseded long ago by BS.

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Hard anodising may impair the surface finish, so surfaces to be treated should have a finish superior to that required xef the processed item. Key strengths of hard anodising include: Restrictions on types of aluminium suitable for hard anodising. Hard Anodising Hard anodising is primarily a functional surface finish applied where aluminium components require increased wear resistance and surface hardness.

Deep sea components which are subject to harsh salt water environments. 003-26 There are a few considerations to be aware of when considering hard anodising.

Examples of hard blue and hard 0-26 anodised components Natural hard anodised series alloy. 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 with a significantly higher voltage being applied. Colour matching is more difficult with a hard anodised component.

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Hard anodising also provides a high degree of electrical insulation. Typical applications for hard anodised components are: For example, hard anodised series alloys will have a dark stzn colour in a natural finish, whereas series alloys will give a light sandy colour finish. Ideal for the production of hard wear-resistant surfaces on aluminium for aircraft and general engineering uses. Blind holes will receive a much lower coating thickness which decreases with depth.

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Metal Finishings Ltd

Hard anodising is primarily a functional surface finish applied where aluminium components require increased stam resistance and surface hardness. If uncertain as to suitability of your aluminium please call. This process is then repeated with the asking reversed. Hydraulic systems, valves, pumps and pulleys. Choice Of Alloys The colour and appearance of hard anodised components varies significantly depending on the alloy used. Colours will tend to be darker and will vary widely stann alloys such as and series alloys.

Maximum Size Criteria The table below outlines the maximum size criteria for hard anodising: 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 is 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: 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.

Natural hard anodised series alloy. Machinery, hydraulics and tooling. We can carry out basic masking of components to prevent individual surfaces or holes from being anodised. Not suitable for free cutting aluminium. 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.


Masking can be undertaken to restrict the hard anodising to the waer resistant surfaces such as cylinder bores.

Edges of items to be hard anodised need to be radiused. The resulting anodic film has more uniform crystalline structure which gives the increased hardness.

Hard Anodising

Moving parts in machinery for packaging systems and general engineering applications. We offer tank sizes up to 8′ x 5′ x 3′.

There are a number of limitations associated with Sulphuric Anodising:. 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.

We have specialist chilling equipment and a modern pulse rectifier to achieve these conditions. If these apply then maybe semi-hard anodising would make a suitable alternative. This is usually performed to maintain areas of electrical conductivity for earthing purposes. Correct jigging is essential xtan the resulting finish, and good jig points are required, a consideration that should be made at the design stage of a component.

Examples of hard blue and hard black anodised components Natural hard anodised series alloy Natural hard anodised series alloy. There are a number of limitations associated with Sulphuric Anodising: We offer a fast turn around because of the large size of our tanks.