Technology  >  Heat Treatment   >  Boronizing

Boronizing is a surface treatment where boron atoms are diffused into a workpiece where they combine with iron or nickel atoms to form a hard boride compound layer. All ferrous and nickel-based alloys may be successfully boronized.

Exceptional Wear Resistance

The boride compound layer that forms around the surface of a workpiece is extremely hard and wear resistant with a layer hardness ranging from 1500-2800 HV. Boride layers are much harder and more wear resistant than hardened tool steels, hard chrome plating, or parts that have been carburized, nitrided or nitrocarburized. The boride layer rivals the hardness of many PVD coatings, such as tungsten carbide, yet it has deeper layer thickness and is a diffusion process not susceptible to peeling or delamination. Boronizing has been proven to extend a component°Įs wear life by a factor of 2 to 10 times versus the other treatments previously mentioned. Boronizing can also be combined with other processes such as carburizing, induction hardening, or neutral hardening to further enhance the wear life of a component.

Corrosion Resistance against Acids

The boride compound layer will provide excellent resistance to acid corrosion for parts exposed to substances such as hydrochloric, sulfuric, and phosphoric acid. Boronizing is frequently applied to pumping and valve components used in the oil and gas industry. Boronizing will not increase wet corrosion resistance for components exposed to water or salt spray.

High Temperature Service Applications

The boride compound layer will retain its hardness and wear resistance at elevated temperatures without any loss of performance. The layer will not begin to degrade until it's exposed to service temperatures in excess of 1200 °„F.