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Properties of ATC coating

ATC coating consists of 98% pure chrome. The chromium coating is extremely hard, free of cracks, coneshaped, precise, very thin and of high purity. It can be deposited by a high-energy process on any metal, except magnesium and titanium (limitations apply to aluminium). Since the process temperature is below 80°C, there is no structural change to the base material. This is a major advantage of the process, as it ensures that components retain their dimensional stability and hardness. ATC coatings generally have the appearance of satined platinum. Should the customer request a mirror finish for the surface we will gladly polish it to this effect; please ask us about this special service.

Surface hardness and operating temperature

The hardness of the ATC coating ranges between 75 and 78 HRC (1300–1560 HV), and the coating is neutral in a temperature range between approx. – 230°C and +800°C, without any major changes occurring in adhesion or structure.

Coating thickness and precision

The ideal coating thickness is between 2–12 μm thick, depending on the requirements of the components that are at risk of corrosion or abrasion. The dimensional tolerance for surfaces and chamfers is between approx. ± 1and 2 μm, depending on the thickness of the coating, as well as the material, surface quality and geometry of the part that is to be coated. Owing to the reduced thickness and tolerance of the coating, there is practically no edge build-up. ATC Armoloy coating is also highly elastic and therefore results in good rolling capacity.

Long-term resistance to wear and corrosion

Metal parts whose surface has been coated with ATC coating are protected against cold welding, corrosion and wear. They have an excellent resistance to oxidation up to a temperature of 800°C.

 

Surface finish and coefficient of friction

Depending on the pre-existing roughness, the ATC process may lead to a slight improvement in surface roughness. The coating‘s own roughness is approx. Ra 0.25 μm. The ATC coating‘s excellent sliding properties also lead to substantially reduced friction. The friction coefficient that applies to friction between two ATC chromium coatings is up to 50% lower than the coefficient for steel against steel.

Better demoulding properties

Moulds with an ATC coating have better demoulding properties, especially with regard to moulds made of resin or rubber. This will lead to longer intervals between cleanings, and moulds will also be easier and faster to clean.

Operating efficiency

An ATC coating is the efficient solution to many problems. In many cases, an ATC coating may replace expensive special materials. An ATC coating protects surfaces from environmental influences and thereby increases the life time of components and machines; this is a significant technical advance and an effective way of saving on materials and energy. For most types of application there is no need to rework the parts after coating.

There are many areas of application …

• Mechanical engineering • medical technology • machine tools • robotics • automatisation • automotive industry • all types of rolling bearing • linear guides • drive technology • tensioning elements • cogwheels and gear boxes • cylinders and pistons • shafts and rollers • worms • housings • injection and resin moulds • food industry; USDA approval and EU Regulation No. 1935/2004 • aerospace industry; conforms to all MIL-SPECs, including AMS 2438 A, AMS QQ-C-320, and AMS 2406 G.

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