is called
A zinc diffusion process
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Sherardising or sherardizing is a method of galvanising also called vapour galvanising. It is named for its discoverer Sherard Cowper-Coles (1900). Zinc evaporates and diffuses into the metal target object forming Zn-Fe-phases by heating the object in an airtight container with zinc powder.
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Sherardizing is the formation of a corrosion-resistant, zinc-iron alloy coating, on the surface of steel or iron. ... A thermal diffusion process occurs and the zinc diffuses into the object's metal surface, forming the zinc-iron alloy.
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