Chromium Nitride

SMT   PVT LTD’s CROMA-n is a pharma grade wear and corrosion resistant hard coating deposited by the State-of-the-art physical vapour deposition (PVD) process.   

CROMA-n coating provides superior performance and toughness in metal fabrication and wear applications. CROMA-n can be used as a better substitute for other surface enhancement techniques, such as chromium plating, thermal diffusion process. CROMA-n is two times harder as compared with conventional hard chrome plating. The high hardness, excellent oxidation resistant, low coefficient of friction and low residual stress levels of CROMA-n coating combine to resist abrasive wear, metal-on-metal wear and galling. CROMA-n has low surface energy and chemical inert nature of coating enhances its anti-sticking nature with most formulations and surrounding environment. The metallic silver colour is similar in appearance to polished stainless steel. The low temperature deposition process allows coating of close tolerance, precision tools that are unsuited with high temperature CVD and thermal diffusion processes. CROMA-n can be used as a better substitute for other surface enhancement techniques such as chromium plating, thermal diffusion. For Tablet tooling application, coating thickness in kept around 2 microns.

  CROMA-n Properties

  • Hardness: 2000±400 HV
  • Oxidation Temp: 7000C
  • Surface Roughness (Ra): 0.1 µm
  • Friction coefficient: 0.55
  • Wear coefficient:6.0 x 10-14 m2/ N
  • Coating Structure: Monolayer
  • Colour: Silver-Grey


  • Good wear protection
  • Good corrosion resistance
  • Superior oxidation stability
  • Good ductility
  • Biocompatible