<P> Electroplating is a common surface - treatment technique . It involves bonding a thin layer of another metal such as gold, silver, chromium or zinc to the surface of the product by hydrolysis . It is used to reduce corrosion, create abrasion resistance and improve the product's aesthetic appearance . Plating can even change the properties of the original part including conductivity, heat dissipation or structural integrity . There are four main electroplating methods to ensure proper coating and cost effectiveness per product: mass plating, rack plating, continuous plating and line plating . </P> <P> Thermal spraying techniques are another popular finishing option, and often have better high temperature properties than electroplated coatings due to the thicker coating . The four main thermal spray processes include electric wire arc spray, flame (oxy acetylene combustion) spray, plasma spray and high velocity oxy fuel (HVOF) spray . </P>

A joint that has been created by heating pieces of metal