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Engineering 28 Oct Def Stan Process M Passivation, Stainless Steel Passivation Def Stan 26, Hard Anodising, This was superseded long ago by BS.

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Edges of items to be hard anodised need to be radiused. Ideal for the production of hard wear-resistant surfaces on aluminium for aircraft and general engineering uses. Hard anodising may impair the surface finish, so surfaces ztan be treated should have a finish superior to that required on the processed item. Deep sea components which are subject to harsh salt water environments. If uncertain as to suitability of your aluminium please call.

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 staan approval before production batch sizes are processed.

Examples of hard blue and hard black anodised components Natural hard anodised series alloy. 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: We have specialist chilling equipment and a modern pulse rectifier to achieve these conditions.


Masking can be undertaken to restrict the hard anodising to the waer resistant surfaces such as cylinder bores. Colours will tend to be darker and will vary widely between alloys such as and series alloys. This process is then repeated with the asking reversed. Moving parts in machinery for packaging systems and general engineering applications.

The resulting anodic film has more uniform crystalline structure which gives the increased hardness. Not suitable for free cutting aluminium.

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:.

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.

Hydraulic systems, valves, pumps and pulleys. Typical applications for hard anodised components are: Hard anodising also provides a high degree of electrical insulation.

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This process usually involves the sulphuric or chromic anodising of the non critical areas det the stopping off of the areas to be hard anodised. Key strengths of hard anodising include: We offer a fast turn around because of the large size of our tanks. Restrictions There are a few considerations to be aware of when considering hard anodising.

sran Restrictions on types of aluminium suitable for hard anodising. Machinery, hydraulics and tooling. 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. 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. There are a number of limitations associated with Sulphuric Anodising: Colour matching is more difficult with a hard anodised component.

Hard Anodising

Natural hard anodised series alloy. Maximum Size Criteria The table below outlines the maximum size criteria for hard anodising: Blind holes will receive a much lower coating thickness which decreases with depth. We offer tank sizes up to 8′ x 5′ x 3′. Choice Of Alloys The colour and appearance of hard anodised components varies significantly depending on the alloy used.

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 can carry out basic masking of satn to prevent individual surfaces or holes from being anodised.

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. Hard anodising is primarily a functional surface finish applied where aluminium components require increased wear resistance and dff hardness. Hard Anodising Hard anodising is primarily a functional surface finish applied where aluminium components ddef increased wear resistance and surface hardness.