Abstract
This chapter discusses coatings and surface engineering, which are used to protect manufactured components from thermal or corrosive degradation, impart wear resistance and hardness to the surface while retaining the toughness and ductility of the bulk component, and enhance the aesthetic appeal. Many factors must be considered in selecting coatings for a given application. There is no such thing as a universal coating that can be used under all conditions. Coatings are not inherently good or bad, and all coating selections represent compromises made to satisfy all the variables involved. The process of selecting coatings must consider the operating conditions, material compatibility issues, nature and surface preparation of substrate, time or speed of application, cost, safety, environmental effects, coating properties, and structural design. Selecting the right coating is a process of elimination rather than selection. The process of designing and developing coatings for modern technological applications combines experimentation and analysis.
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