7. Liquid hard deposits
Techniques using the liquid route to improve the friction and wear resistance of tool steels include immersion in molten salts, electroplating processes (hard chromium plating) and electroless chemical reduction (nickel-phosphorus or nickel-boron).
7.1 Immersion in molten salt baths
Due to their high reactivity, molten salt baths containing chlorides with added metal elements such as Cr, V are likely to produce surface reactions of the dissociation and exchange type at temperatures close to 1,000°C. These reactions result in the supply and diffusion of metallic elements from the bath into the substrate. Back-diffusion of carbon from the substrate to the surface results in the creation of a deposit of carbides, whose thickness does not exceed 15 µm due to the...
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Liquid hard deposits
Hardfacing techniques
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