Liquid Nitrocarburizing (QPQ)

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Exxin Canada Inc Liquid Nitrocarburizing (LNC) with QPQ Caliper Pistons with Liquid Nitrocarburizing with QPQ Also known as “liquid nitriding” or “salt bath nitriding” liquid nitrocarburizing is a thermochemical process that simultaneously diffuses both nitrogen and carbon into the surface of ferrous metals. The process is carried out in a liquid salt bath at a subcritical treatment temperature, typically 1075°F (580°C). This results in improved wear resistance, lubricity, fatigue strength, and corrosion resistance. Quench Polish Quench (QPQ) Nitrocarburizing can also be enhanced by incorporating a sequence of treatments consisting of a mechanical polish and salt bath oxidation, known as quench polish quench (QPQ). It begins with the treating cycle of the nitrocarburizing segment, i.e. pre-heat, nitrocarburizing salt, oxidizing salt bath quench, which produces a layer of epsilon iron nitride. The next step is a mechanical polish of the nitride layer, thus restoring the original surface finish. Finally, to optimize the corrosion resistance, the component is then re-immersed in the oxidizing salt quench bath for 20-30 minutes. The complete process results in the formation of an iron nitride compound with a thin overlay of iron oxide, resulting in a significant increase in corrosion protection. In addition, the process provides an aesthetically appealing lustrous black surface finish. Exxin Canada Inc LNC with QPQ vs Chrome Plating Liquid nitrocarburizing with QPQ produces engineering and surface properties of ferrous metals that are actually better than those produced through chrome plating. The benefits of chromium plating including wear resistance, lubricity, fatigue strength, and corrosion are all improved when ferrous metals have undergone LNC with QPQ. LNC with QPQ significantly enhances the corrosion protection, wear resistance, lubricity and fatigue strength of cast iron and steel components and thus provides a more effective alternative to chrome and nickel plating. Furthermore, this process also provides an appreciable reduction in material and manufacturing costs. .

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Salt Bath Nitriding and QPQ AMS 2753
Salt Bath Nitriding and QPQ AMS 2753 Nitriding is a heat treating process that allows nitrogen onto the surface of a metal to create a case hardened surface. Salt bath nitriding, alse referred to as liquid salt bath ferritic nitrocarburizing is a surface treatment for most ferrous metal components and is designed to improve certain engineering properties to enhance wear resistance, lubricity, fatigue strength and corrosion resistance. The nitriding process will also lower the coefficient of friction. Salt Bath Processes Salt bath nitriding is a thermochemical process in which nitrogen and carbon are diffused simultaneously into the surface of the material. The high concentration of nitrogen chemically combines with iron and other nitride forming elements to produce an outer layer of epsilon iron nitride ( ) which is thin, hard and ductile. This layer is also known as the compound zone which has increased surface hardness to enhance anti-galling characteristics and lowers the coefficient of friction. This compound zone also functions as a solid film lubricant by providing a non-metallic interface between mating surfaces. Nitrogen of lower concentration continues to diffuse below the compound zone and forms a solid solution with the base metal iron. This zone is referred to as the diffusion zone and is noted for its improvement in fatigue strength. Heating Comparison In comparison to conventional heat treating, salt bath nitriding has a low operating temperature typically of 1075°F (580°C). At this temperature, distortion is minimized and components can be completed through the final machining and heat treatment stages prior to the salt bath nitriding process.
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