Thread: Galvanic Corrosion

Many ships use plates of substitute weaker metal (eh my translation i know it sucks) on the propeller & hull components to get the corrosion. Once you know what parts are protected by zinc plates and what are not you can simply check the voltage difference between these two to find out if there's any zinc left.
Not suitable for cars because all metal parts aren't in contact with each other.

(not suitable for razors either )

Edit:

Originally Posted by welshwizard

I see it a lot on vehicle components. For example alloy wheels corrode where they bolt to steel hubs. Salt water electrolyte accelerates the process. In the UK in winter they dump tons of rock salt on the roads as a de-icer.
The application of copper based greases makes the situation worse, but people still use them.

I've often wondered when balancing car wheels why there aren't zinc weights instead of those made of lead. Just one of those things i always wanted to know about galvanic corrosion but were afraid to ask