HEALTH & SAFETY FEATURE SAFER ALTERNATIVE TO HARD CHROMIUM PLATING
frequent harsh cleaning and in engineering applications that could wear softer materials such as bearing surfaces and for tooling including dies and punches. Nitron CA is applied by physical vapour deposition (PVD) under vacuum conditions at low process temperature. Within an electrically charged
Components placed on racks are subject to a negative electrical charge and rotate through the vapour to attract the microscopic droplets which are drawn to the surface to create an even film
For decades hard chromium plating (HCP) has been the engineers’ choice for wear surfaces, tools and parts subject to harsh environments but health and safety concerns and environmental constraints on the process demand an alternative. Heat treatment and hard coatings
specialist the Wallwork Group strongly advocate Nitron CA - a form of chromium nitride (CrN) that is safer and produces a harder film with both heat and chemical resistance that offers an attractive, bright silver finish.
Nitron CA is twice as hard as HCP and
forms a good bond to the substrate. Deposited as an even layer it follows the contours of the part closely and maintains coverage on edges and corners. It shares many of the characteristics of
HCP: it is chemically unreactive and therefore stable and corrosion resistant; the surface is smooth and so highly lubricious; it is heat resistant and can be applied in high thicknesses. This makes it suitable for wear surfaces including medical devices subject to
environment the donor material is placed in a small crucible inside the coating chamber and bombarded with an electron beam to create a vapour or micro fine particles. Components placed on racks are subject to a negative electrical charge and rotate through the vapour to attract the microscopic droplets which are drawn to the surface to create an even film that can vary in thickness according to the application. Manufactures seeking to comply with the requirements of REACH regulations in the EU and OSHA legislation in the USA can be assured that Wallwork PVD processes are environmentally acceptable. Only solid, non-toxic and fully recyclable source materials are used along with inert process gasses with no toxic waste products from the process.
Wallwork Group T: 0161 797 9111
www.wallworkht.com
Avoid accidents: keep cables and hoses out of harms way
free sample online
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FACTORY EQUIPMENT | FEBRUARY 2017 13
PATENT: 1023932
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