Corrosion of metals and alloys as result of pollution, prevention
WHAT IS THE CORROSION? Corrosion is a natural process, which converts a refined metal to a more stable form, such as its oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment.
Metals and alloys are constantly in contact with various substances.They can interact with substances by forming different compounds.As a result properties of metal may change,or total destruction of metal structures occurs.It is very harmful and dangerous process that is called corrosion(lat.Corrosion-attack). ALLOY An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by metallic bonding character. An alloy may be a solid solution of metal elements (a single phase) or a mixture of metallic phases (two or more solutions).
Alloys are used in a wide variety of applications. In some cases, a combination of metals may reduce the overall cost of the material while preserving important properties. In other cases, the combination of metals imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Examples of alloys are steel,solder,brass,pewter,duralumin,phosphor bronze and amalgams.