MELONITE / QPQ
MELONITE, and its synonymous trade-name, Tufftride (or Tenifer), is a relatively straight-forward, flexible process to operate and maintain, and produces exceptionally uniform case hardening. The MELONITE process begins with the placement of parts in a re-circulating air preheat furnace, followed by immersion for 60-240 minutes in a molten nitrogen-rich salt solution contained in an aerated furnace. After nitriding, parts are treated in an oxidizing bath, water-cooled and rinsed.
An alternative series of post-nitriding steps involves a Quench-Polish-Quench (QPQ) sequence after liquid nitriding. For many applications, this finishing process provides a surface condition that protects against corrosion and wear better than hard chrome or nickel plating.
How Melonite Works: Treatment Cycle
Also read our page on ARCOR Salt Bath Nitriding.
Melonite, Tufftride, and Tenifer are registered trademarks of HEF.