Oxynitriding / Oxynitrocarburizing ONC®

Oxynitriding / Oxynitrocarburizing (ONC®) is an advanced thermochemical surface treatment that combines nitrocarburizing with a controlled post-oxidation process to enhance both wear resistance and corrosion protection. The process produces a durable compound layer and a uniform black oxide finish, improving component performance, appearance, and service life while maintaining dimensional stability. ONC® is widely used in automotive, tooling, hydraulic, energy, and industrial applications where durability, corrosion resistance, and surface aesthetics are critical.

Benefits

• Improves wear resistance and surface durability

• Enhances corrosion protection in demanding environments

• Produces an attractive uniform black finish

• Reduces friction and improves sliding performance

• Maintains dimensional stability with minimal distortion

• Increases component life and operational reliability

• Environmentally friendly alternative to traditional black oxide treatments

GM-Entreprises ONC® technology combines precise process control with proven metallurgical performance to deliver consistent, repeatable results across a wide range of materials and applications. Our experts can help determine the optimal treatment parameters to maximize component performance and service life.