Why Are Some Parts Black?
By Cameron Landherr
If you’ve ever taken a close look at metal components on Akkerman equipment, you may have noticed that many are black rather than silver or our infamous blue. This isn’t just for appearance; it’s a sign that the part has undergone a specialized process to improve its strength and durability.
These components are treated using a process called Ferritic Nitrocarburizing (FNC) with post-oxidation. Akkerman uses this method to protect steel parts that operate in punishing ground conditions or face high cycle usage.
Figure 1: This Launch Shaft Break-Out Tool is designed to speed up tripping out pilot tubes during pull-back. The FNC process is used to maximize strength and durability.
During the first stage of the process, the part is heated in a controlled environment that allows nitrogen and carbon to diffuse into the surface of the steel. This creates a hardened outer layer that resists wear, scratches, and surface damage. At the same time, the core of the part remains tough and flexible, helping to prevent cracking or failure under stress.
The second stage, post-oxidation, is what gives the part its black finish. In this step, a thin protective layer forms on the surface, sealing the material and significantly improving resistance to rust and corrosion. This layer also reduces friction, allowing components to move more smoothly and extend their service life.
Another key advantage of this process is its precision. The FNC process does not significantly alter the size or shape of the part allowing components to be treated after final machining.
In short, the black finish is more than cosmetic, it’s a smart, engineered solution that makes parts stronger, smoother, and longer lasting.
About the Author
Cameron Landherr
Project Engineer/Technical Support & Service Manager
Cameron Landherr has been with Akkerman since May 2017 and serves as Technical Support and Service Manager. A graduate of Minnesota State University, Mankato, with a degree in Mechanical Engineering, Cameron earned his Professional Engineer (P.E.) license in 2021. He plays a key role in supporting Akkerman’s advanced guidance systems and Sliplining product lines, along with leading technical services to deliver dependable solutions and support to customers.
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