Automation and Linear Motion Coatings

Armoloy Thin Dense Chrome (TDC®) achieves a surface hardness of 72 to 78 Rockwell C (Rc) — significantly higher than standard hard chrome, which typically falls between 68 and 72 Rc. This exceptional hardness is due to TDC’s dense, microcrack-free structure, which enhances wear resistance and surface integrity.

Because TDC is applied in extremely thin layers (typically 0.0001″–0.0005″), direct hardness measurements on coated components reflect a combination of the coating and the base material. To accurately measure coating hardness, TDC must be applied to a specially prepared metal coupon and tested using microhardness methods such as ASTM E384 (Vickers test).

This high surface hardness, paired with low friction and corrosion resistance, makes Armoloy ideal for precision tooling, bearings, valves, and linear motion systems operating under extreme wear conditions.

No, high-performance coatings such as Armoloy Thin Dense Chrome (TDC) are applied in extremely thin layers — typically between 0.0001″ and 0.0005″ per surface — allowing coated parts to maintain tight dimensional tolerances. This makes TDC an excellent choice for linear motion components such as precision bearings, guide rails, and ball screws, where fit, alignment, and repeatable motion are critical.

Because of its low effective thickness and uniform deposition, TDC can often be applied to existing part designs without modification, avoiding rework or redesign of mating components. This dimensional consistency, combined with its wear and corrosion resistance, makes TDC ideal for automation, robotics, and high-performance motion assemblies.

Yes, corrosion-resistant coatings such as Armoloy Thin Dense Chrome (TDC) and electroless nickel are commonly used to protect linear motion components — including ball screws, linear guides, and actuator rails — from exposure to moisture, chemicals, and industrial washdowns.

These coatings create a hard, non-porous barrier that prevents rust and pitting, extending the life of components in demanding environments. This is especially critical in food processing, pharmaceutical packaging, and outdoor automation systems, where unprotected steel surfaces would otherwise degrade quickly.

Common coatings include thin dense chrome (TDC), electroless nickel, and fluoropolymer coatings. TDC is particularly valued for its hardness, low friction, and wear resistance, while electroless nickel provides excellent corrosion protection. Fluoropolymer coatings, like PTFE, offer excellent lubricity, which reduces the need for external lubrication.