Salt bath nitriding —also known as ferritic nitrocarburizing (FNC)— is one of the most popular ways to achieve these results, but it isn’t the only way. Black oxide or blackening is a conversion coating for ferrous materials, stainless steel, copper and copper based alloys, zinc, powdered metals, and silver solder. ISONITE® QPQ (per SAE AMS 2753) is a high-performance variety of salt bath nitrocarburizing process. The black oxide finish makes the metal surface porous, enabling it to hold a thin layer of oil. It's the oil that prevents rust from forming on the metal. Nitrogen is plentiful on Earth, however, in nature it exists as a two-atom molecule, chemically inert and too large to penetrate the surface. The Ion Nitriding Process. Hence nitriding technologies focus on … Enhancing corrosion resistance involves a secondary polishing operation, followed by re-oxidation to produce a lustrous black finish as well as case hardening the steel. Watch this if you'd like to see the differences between Nickel Boron and your standard Black Nitride BCG. The process concludes with a quench. The process makes parts more resistant to wear and increases fatigue strength. The process is carried out at 750-1050°F, making it faster than gas nitriding. If the parts are scaled or rusty and an acid pickle is required, any hydrogen that may have evolved will quickly dissipate in the black oxide tank (running temp. Post-oxidation after nitriding combined with polishing produces coatings with exceptional appearance (black color) and high corrosion resistance (greater than electrolytic chrome plating). To achieve maximal corrosion resistance the black oxide must be impregnated with oil or wax. Gas nitriding is a thermochemical case hardening process used to increase wear resistance, surface hardness and fatigue life by dissolution of nitrogen and hard nitride precipitations. A two-part nitride layer consisting of a monophase compound layer and a diffusion layer is formed. All machining, stress relieving, as well as hardening and tempering are normally carried out before nitriding. Nitriding is a case-hardening process of enriching the solid steel surface with nitrogen at a low temperature, normally in the range of 500-575°C (i.e., below A 1), when the steel is ferritic. Liquid nitriding is a subcritical surface enhancement process with one of the longest track records of success of any case hardening technology. nitriding process as it is known today. Benefits Favoured for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Gas nitriding can be applied to unalloyed steels and irons to produce a corrosion- and wear-resistant nitride layer. There are many different trade names—such as Arcor, Tenifer, Tufftride, Melonite, Tenoplus, QPQ, etc.—that have been patented. The parts are heated in a special container through which ammonia gas … NITREG®-C conducted in gas atmospheres can be considered a process complementary to NITREG® gas nitriding. Firearms manufacturers can improve wear-resistance, erosion protection, corrosion protection and receive a uniform black finish from one process. There are two general types of nitriding processes: 1. Plasma ion nitriding and corrosion protection treatments for clients in Green Bay, WI and across the USA. In many cases, it is being used as an alternative method for surface heat treatment process such as hardening, hard chrome plating … The Salt Bath Nitride process is a Thermo Chemical treatment that improves wear resistance and corrosion resistance of ferrous metals with little or no dimensional change. The first step of the process is a preheat to raise the components surface temperature to about 700 - 800°F in air. Black Nitride Bolt Carrier Group For The AR 15 The QPQ (Quench Polish Quench) process is an advanced Black Nitriding process, which augments the standard Nu-Tride process. [2] The durability and corrosion protection offered by black nitride treatment is unmatched by any other coating available. The process has the advantage of being able to penetrate blind holes, and also allows for the masking of parts to keep areas which may need further machining soft.
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