Corrosion
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Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion.
Corrosion on exposed metal, including a bolt and nut
Galvanic corrosion of an aluminium plate occurred when the plate was connected to a mild steel structural support.
Gold nuggets do not naturally corrode, even on a geological time scale.
Normal microstructure of Type 304 stainless steel surface
Ceramic
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A ceramic is any of the various hard, brittle, heat-resistant, and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain, and brick.
Silicon nitride rocket thruster. Left: Mounted in test stand. Right: Being tested with H2/O2 propellants.
Earliest known ceramics are the Gravettian figurines that date to 29,000–25,000 BC.
Corded-Ware culture pottery from 2500 BC
Cutting disks made of silicon carbide