Mechatronic Systems Engineering 3301A/B Lecture Notes - Lecture 27: Hot Work, Screen Printing, Pad Printing
12 Aug 2020
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Document Summary
Mechanical polishing: the roughness of a surface is reduced and its precision increased, by material removal using finely ground abrasives. Electroplating: metal is plated onto a conducting work piece by electro-deposition in a plating bath. Heat treatment: a surface layer of the work piece is hardened and made more corrosion resistant by the inward diffusion of carbon, nitrogen, phosphorous, or aluminum from a powder bed or molten bath. Anodizing: a surface oxide layer is built up on the work piece by a potential gradient in an oxidizing bath. Organic-solvent based paints give durable coatings with high finish, but the solvent poses environmental problems. Water-based paints overcome these, but dry more slowly and the resulting paint film is less perfect. In polymer powder-coating and polymer powder-spraying, a film of thermoplastic is deposited on the surface, giving a protective layer that can be brightly colored.
