There are various treatment types a worker is exposed to and learns over time. For example, one heat process is called nitriding; workers use this method in situations where they need to diffuse nitrogen into a product's surface. Let’s find out everything needed to know about nitriding and the processes behind this heat treatment.
What Is Nitriding?
The industrial field used nitriding as early as 1900. The process is meant to help form a hard casing onto products like forging dies, firearm components, and textile machinery. However, the nitriding process is versatile, and considering its simplicity, it’s used across many trades.
The Nitriding Process
While simple to learn and use, the nitriding process takes close to 4 to 60 hours to complete fully. During the procedure, a worker would expect the method to improve fatigue in an item while eliminating the galling properties in a product.
What else does the nitriding process do? For one, it actually builds resistance to corrosion and extremely difficult temperatures. Additionally, nitriding prevents wear and tear.
Although nitriding prevents these things, it won’t happen unless one of three methods is used:
- Gas
- Plasma
- Salt-bath nitriding
Gas
When treating the metal with the gas method, the surface builds up with ammonia nitriding; when coated, the ammonia transforms into hydrogen and nitrogen. When the nitrogen’s diffused, it creates a nitride layer.
For the gas to be effective, it needs specific factors, such as:
- Gas activity control
- Process control
- Time control
- Temperature measurements
Plasma
Plasma nitriding uses plasma discharge to heat a metal surface. Once the plasma hits metal, it implants nitrogen. Plasma doesn’t rely on ammonia gas to release nitrogen. Instead, the plasma goes through a vacuum with high electric voltage fields for the molecules to form.
Salt-Bath Nitriding
Salt-bath nitriding is different from its counterparts because it uses molten salt to create nitrogen. The entire process releases cyanate from the cyanide in the salt. After being submerged in a heated salt bath, the nitrogen creates a thin layer of iron nitride when combined with iron.
The salt bath is a quicker process; however, the chemicals used are highly toxic, so workers must wear the right protective gear when utilizing this method.
The Pros and Cons of Nitriding Processes
There are pros and cons of nitriding processes. No matter what you plan to do, ensure you have researched everything thoroughly and know what to expect when using either practice. Look below for the pros and cons of the nitriding processes.
The pros:
- Metal appears less distorted
- These methods are pollution-free
- The changes are quick
The cons:
- Nitriding does cost a lot
- You need to have experience working with nitride procedures
- You need to keep track of process control
While learning about the different nitride processes, you might find it time to research nitride coating services for your company. Hiring a professional industrial coating company to do the work for you can save money and ensure you hire someone with the proper training and knowledge.
