Galvanic corrosion
（重定向自Electrolytic corrosion）
![Corrosion of an iron nail wrapped in bright copper wire, showing cathodic protection of copper; a ferroxyl indicator solution shows colored chemical indications of two types of ions diffusing through a moist agar medium](/Images/godic/202501/11/Corrosão_de_ferro_por_sacrifício_em_contacto_com_cobre0006.jpg")
![Galvanic corrosion in the Statue of Liberty](/Images/godic/202501/11/Statue_lib_corr10006.png")
![Regular maintenance checks discovered that the Statue of Liberty suffered from galvanic corrosion](/Images/godic/202501/11/Statue-de-la-liberte-new-york0006.jpg")
![Aluminum anodes mounted on a steel-jacketed structure](/Images/godic/202501/11/Anodes-on-jacket0006.jpg")
Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte. This same galvanic reaction is exploited in primary batteries to generate an electrical voltage.