A full range of finishing processes is available either in house or from our trusted sub-contact partners.
to any Ral colour required
Predominately carried out in house.
Stress Relieving, Case Hardening, Nitriding, Through Hardening
Other sub-contract services include galvanising, precision grinding, honing and boring, deep hole drilling, EDM, Wire Erosion and Broaching.
Anodising is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts, increasing resistance to corrosion and wear, and providing better adhesion for paint primers and glues, the thicker the oxide layer, the more protection provided. Anodising is also used to prevent galling of threaded components and anodic films are most commonly applied to protect aluminium alloys, making them scratch resistant. Anodising changes the microscopic texture of the surface and the crystal structure of the metal near the surface. Thick coatings are normally porous, so a sealing process is often required to achieve corrosion resistance. Anodic films are generally much stronger and more adherent than most types of paint and metal plating, but also more brittle. This makes them less likely to crack and peel from aging and wear, but more susceptible to cracking from thermal stress.
- 1000 Series-Say 1080A, 1200A, 1050 - ideal for anodising
- 2000 Series-Say 2014A, 2024 - a satisfactory anodised layer can be produced
- 3000 Series-Say 3103, 3105 - ideal for anodising
- 4000 Series-Say 4043A,4047A - a satisfactory anodised layer can be produced
- 5000 Series-Say 5005, 5056, 5083, 5251, 5454 - ideal for anodising
- 6000 Series-Say 6061, 6063, 6082, 6262, 6463 - ideal for anodising
- 7000 Series-Say 7020, 7075 - ideal for anodising
Iridite NCP (non-chrome chemical process) is a process that offers extremely high resistance to corrosion and the ability to withstand high temperatures. It is environmentally compliant as it contains no hexavalent or trivalent chromium compounds.It adds a protective chromate conversion film coating on aluminium and its alloys. Iridite is often used for high or low frequency electrical applications, as Iridite coating has a minimal effect on aluminium’s electrical characteristics when used at lower concentrations. In addition, it is often used as a protective coating for abraded anodized surfaces and to provide an electrical contact. Iridite coating can be applied using dip, brush, swab, or spray methods and creates coatings in shades ranging from clear to dark yellow. The darker shade of coating, the greater the corrosion protection. Yellow Iridite coating can be left as the final finish or can be dyed other colours.
Once coated with Iridite there are a number of further finishing options:
Iridite coating can act as a base key for paint application and high performance top coats and lacquers.
Iridite provides an excellent base for rubber bonding.
Once Iridite coated, the aluminium surface can be welded either by shielded arc method or by spot welding.
- Electronic components manufacture It has conductive properties and protects the base metal from oxidation, so preserving solderability
- Food processing It is non-toxic, ductile and corrosion resistant Aerospace
Zinc Phosphate is used for rust prevention on ferrous metal and is a lighter alternative to manganese phosphate while providing resistance to harsh elements that tend to wear products quickly. Dark grey in colour zinc phosphate is suitable for paint pre-treatment.
Manganese phosphate is used to pre-treat ferrous metal prior to painting and to increase corrosion resistance. The coating, dark grey in colour creates a heavy crystalline finish on ferrous surfaces and absorbs oil and other lubricants.
Hard chrome plating, sometimes referred to as functional chrome plating, can be applied in thick layers for heavy industrial applications. It increases wear and corrosion resistance whilst creating a low co-efficient of friction. With abrasion being the most common and destructive wear process found in industry, hard chrome has the potential to solve many problems in pumps, valves, bearings, etc.
Also known as ‘alodining’ or ‘chromating’, alochroming is a chemical process that adds a corrosion-resistant protective coating to aluminium and its alloys, and acts as a primer for painted aluminium. Although pure aluminium oxidises with air to create its own protective coating, untreated aluminium alloys have little protection against corrosion.
When used in conjunction with anodising, alochroming creates a protective coating on aluminium that doubles its resistance to salt water, compared to anodising alone. Alochromed parts become hydrophobic with age, providing a very high level of long term protection against water or other moisture.
The main benefits of Alochrom coating for aluminium are:
- Parts retain the majority of their original electrical conductivity
Adds no extra weight
- Pre-process dimensions remain unaltered
- Corrosion resistance
- Moisture resistance
- A primer key for paint
- Low electrical resistance
- Scratch repellent surface
- Marks like fingerprints just wipe away
Alochrom 1000 adds a transparent coating whilst Alochrom 1200 adds a gold iridescent coating.
Also known as electrochemical polishing, anodic polishing, or electrolytic polishing, electropolishing is an electrochemical process that removes unwanted materials from metallic components. Its purpose is to polish, passivate, and deburr metal parts. Electropolished metal is metallically pure, stress free, bright, decorative, chemically passive, smooth and free from minor burrs. A superior surface finish is achieved by electromechanically removing a layer of metal under controlled conditions. The final finish is free from inclusions, very smooth, and offers an unrivalled level of corrosion resistance. Because the process of electro polishing provides a reduced coefficient of friction, it dramatically improves metal’s resistance to corrosion in harsh environments. The smooth, blemish free surface is resistant to bacteria and provides excellent light reflectivity. Hardness
These are both acid chemical treatments for stainless steel, developed to remove contaminants, discolouration and scaling. The two processes combined together result in a clean, chemically passive and corrosion resistant oxide surface film on stainless steel. Stainless steels need to be pickled before they can be passivated, as the surface needs to be clean, free from contamination, and free from any scale resulting from previous welding operations.
Although two treatments are often performed together, they are not the same:
- Pickling is done first and removes scale via the application of strong acids. It usually involves nitric/hydrofluoric acid mixtures
- Passivation adds a passive outer coating to the metal via an oxidation process using nitric acid. Sometimes Nitric acid alone can also be used to remove any light surface iron contamination after which the acid facilitates the passivation of the cleaned steel surface.
All of the above is an overview of finishes and treatments available either in house or from our mainstream sub-contractors, this is not an exhaustive list so please do get in touch to discuss any other requirements you may have.