Is there a problem with galvanic corrosion of zinc alloys?
Galvanic corrosion is seldom a factor with ZAMAK and ZA alloys because of the material’s inherently good corrosion resistance. If a small die cast zinc part is electrically connected to a large brass or steel part and immersed in a corrosive electrolyte the rate of corrosion may be increased to the point where there is a problem. This can usually be overcome by either insulating the parts or giving a surface coating to the zinc alloy. Note that the zinc anodes used to protect boats from corrosion are not ZAMAK or ZA alloys; they are alloys that are specially formulated to corrode, deliberately.
galvanic corrosion depends on many factors, and the type of metal is just one.. in order to have galvanic corrosion you need two different material in contact and immersed in an electrolyte
you’ve to consider:
-type of metals
– ratio of the area of the two metals
– type of electrolyte
so if you want to assed if galvanic corrosion is a problem for a metal you should first define the type of metal in contact
http://www.corrosionist.com/Galvanic_Corrosion.htm
Vitt
