Corrosion between dissimilar metals

Topics include, Machine Tools & Tooling, Precision Measuring, Materials and their Properties, Electrical discussions related to machine tools, setups, fixtures and jigs and other general discussion related to amateur machining.

Moderators: Harold_V, websterz, GlennW

User avatar
Posts: 426
Joined: Sat Jan 04, 2003 8:34 pm
Location: Stone Mountain, Ga.

Re: Corrosion between dissimilar metals

Post by Rick » Tue Dec 05, 2017 8:59 am

Thanks for the explanation, I have always wondered about that

“We make a living by what we get, but we make a life by what we give." Sir Winston Leonard Spencer Churchill (1874-1965)
"Peace is that brief glorious moment in history when everybody stands around reloading". Unknown
Murphy's Law: " If it can go wrong it will"
O-Tool's Corollary: "Murphy was entirely too optimistic"

John Hasler
Posts: 913
Joined: Tue Dec 06, 2016 4:05 pm
Location: Elmwood, Wisconsin

Re: Corrosion between dissimilar metals

Post by John Hasler » Tue Dec 05, 2017 9:57 am

Here is a discussion of corrosion in stainless steels:

User avatar
Posts: 596
Joined: Wed Dec 12, 2007 11:21 pm
Location: savannah ga.

Re: Corrosion between dissimilar metals

Post by rudd » Fri Dec 08, 2017 7:46 pm

When you have two dis-similar metals in a corrosive environment, you have electrical potential. If you connect them, yes, it's like a battery.
" In 1800, Volta invented the first true battery, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte)."
Ask one of the nice boat people above how boat zincs work.

Post Reply