Sacrificial Protection

Name:
Sacrificial Protection
Detailed information:
The preferential corrosion of a metal coating for the sake of protecting the substrate metal. For example, when zinc is in contact with a more noble (less reactive) metal in the electromotive series, such as steel, a galvanic cell is created in which electric current will flow in the presence of an electrolyte. Atmospherically contaminated moisture constitutes the electrolyte. Under these conditions, the zinc coating rather than the steel is affected. Thus, galvanic protection with zinc is sometimes called sacrificial protection.See Galvanizing.