Liquid Nitriding & QPQ
Liquid Nitriding (Salt Bath Nitriding)
Liquid Nitriding is a thermo-chemical surface treatment process carried out in a controlled molten salt bath. In this process, nitrogen and carbon are diffused into the surface of ferrous components to improve wear resistance, fatigue strength, and corrosion resistance.
The process is performed at relatively low temperatures, resulting in minimal distortion and making it suitable for precision components. It produces a uniform compound layer with excellent surface properties.
Key Benefits
- Improved wear and abrasion resistance
- Enhanced fatigue strength
- Better corrosion resistance
- Uniform case depth
- Minimal distortion
Typical Applications
- Automotive components
- Gears and shafts
- Fasteners
- Pistons and cylinder parts
- Tooling and machine components
QPQ Process (Quench-Polish-Quench)
QPQ (Quench-Polish-Quench) is an advanced variant of liquid nitriding that provides superior surface finish, enhanced corrosion resistance, and improved wear properties. The process consists of nitriding in a salt bath, followed by polishing and a post-oxidation treatment.
This results in a smooth black finish with excellent functional and aesthetic properties. QPQ-treated components exhibit significantly improved durability and resistance to harsh operating conditions.
Key Benefits
- Excellent corrosion resistance
- Superior wear resistance
- Improved surface finish
- Increased fatigue life
- Attractive black oxide finish
Typical Applications
- Automotive and precision components
- Hydraulic parts
- Textile machinery components
- Fasteners and fittings
- Tooling and machine components
Almost all material can be treated.
The hardness varies as per the type of material.
In Liquid Nitriding, treatment time is generally within a day. Final timing depends on the desired case depth & size of the steel parts.
We charge based on the weight (kg) of material, however, pricing depends on the maximum number of pieces that can be treated at once. For details, please contact us.
