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Liquid Nitriding Process

Basic Process Steps for Liquid Nitriding:

CLIN Process Steps Scope Description
Degreasing/Rinsing Remove oils, and other particulates from the surfaces of the parts
Preheating Maintain a stable temperature in the nitrocarburizing melt
Nitrocarburizing Nitrocarburizing
Oxidizing* Corrosion protection, black appearance The porous zone of the iron nitride layer is oxidized to form stable iron oxides (Fe3O4).
Cooling/Cleaning Remove salt from the surface of the parts
Mechanical finishing* Smooth surface, low roughness (no lower than before treatment), friction properties HEF expertise:
Blast finishing
Mass finishing
Centerless polishing
Impregnation Improve corrosion resistance, bright appearance HEF impregnation using:
Corolac (dry appearance)
Corofluide (oily appearance)

The LN process is carried out in equipment manufactured by HEF and customized to the nature of the applications under consideration – the size and shape of components to be nitrided; the throughput rate required; process steps required to achieve the desired nitriding specifications; and environmental considerations. A schematic view of a typical ARCOR® process line is shown below:

ARCOR® process line

These CLIN process lines can be fully/partially enclosed or have an open configuration as shown below:

CLIN process lines