Many coatings and surface treatments are available for metals. Some are primarily responsible for corrosion prevention while others are intended to improve surface hardness or wear resistance. Coatings are also used to change dimensions (slightly) and to alter some physical properties such as reflectance and color. The chart below shows various types of coatings for metals. These divide into two major classes, metallic and nonmetallic, based on the type of coating. Some of the classes divide into many subclasses.



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