Corrosion and its prevention
Corrosion is the degradation of a metal caused by an electrochemical process. The metal surface must be free of contaminants such as dirt, oil, dust, old finishes, and fingerprints. The coating should be done with a minimum of delay after cleaning and precautions should be taken to prevent recontamination. Brass and copper alloys will oxidize and tarnish rapidly after being chemically polished.
Tinning or tin plating is the process of thinly coating a sheet or strip of steel with tin (Sn), and the resulting product is known as tinplate. Tinplate is a light gauge, cold-reduced low-carbon steel sheet or strip, coated on both faces with commercially pure tin. Tinplate is used for making all types of containers such as food cans, beverage cans, and artistic cans. A protective layer of aluminium oxide can prevent corrosion.