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Plasma spray can be used to produce coatings. of virtually any metallic, cermet, or ceramic ma-. terial. The coatings are used for most of the types. of applications described in a subsequent section. The transferred plasma-arc process adds to. plasma spray the capability of substrate surface heat-. ing and melting. Figure 7 is a schematic repre-. sentation of the process.
Steel is coated by a heat process, or through electrolysis, with a layer to protect the metal base against corrosion. The most commonly used coating material is zinc which can be applied either using the heat process (hot-dip galvanising) or using electrolysis (electro-galvanising).