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Understanding Galvanic Corrosion

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Beth Stackpole
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Part of a core foundation
Beth Stackpole   1/20/2012 7:31:47 AM
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Great primer, Dave, on a topic that should be top of mind for engineers. I'm actually surprised this kind of material isn't duly covered in the standard engineering curriculum. Seems like materials/chemistry 101, especially for engineers trying to create products that have lasting legs.

 

sensor pro
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Re: Part of a core foundation
sensor pro   1/20/2012 10:07:31 AM
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great article. Gave me lots of material to think about. Very clear with nice example.

Thanks. Really enjoyed reading.

 

Totally brought me back to chem101 or 102, who remembers now !!!

Dave Palmer
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Re: Part of a core foundation
Dave Palmer   1/20/2012 11:03:23 AM
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Thanks, Beth! You're right that this is something that should be part of a basic engineering education.  Unfortunately, most mechanical engineering programs only require one semester of chemistry.  Most universities which have materials engineering departments offer an upper-level undergraduate course in corrosion as an elective, but it's not usually required.

Beth Stackpole
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Re: Part of a core foundation
Beth Stackpole   1/20/2012 12:45:49 PM
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That's really hard to believe. I would think now with so much (or somewhat, however you want to look at it) of the focus on sustainability and alternative energy, chemistry and the make up of matter would be more important than ever to basic engineering work. Hopefully, we'll start to see a change in engineering curriculum to reflect that.

Ann R. Thryft
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Re: Part of a core foundation
Ann R. Thryft   1/20/2012 1:19:53 PM
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Thanks for a great article on a basic and important subject. I've actually been wondering about galvanic corrosion since I'm coming across the topic here at DN a lot when writing about coatings and adhesives.

I'm with Beth--I've had to learn or re-learn a lot of basic chemistry in this beat, and am astonished that engineers have so little training in it. Aside from basic principles of ME, it's the other main subject I keep running into here.


Rob Spiegel
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Re: Part of a core foundation
Rob Spiegel   1/20/2012 3:31:27 PM
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Good article -- and surprising, Dave. The chemistry here is counter intuitive. there are some things that take knowledge, not just instinct.

Alexander Wolfe
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Welcome, Dave
Alexander Wolfe   1/22/2012 10:03:55 AM
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Welcome, Dave, as Design News' newest guest blogger. For readers who enjoyed this -- as did I -- we'll have another blog from Dave in a few weeks. As you can tell, he's a serious materials expert.

mrmikel
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Re: Part of a core foundation
mrmikel   1/23/2012 9:17:55 AM
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Seems like a subject that ought to covered in more depth.  Easy for a bridge designer for instance to build a time bomb into a bridge without intending to.  Important for field engineers to make clear to maintainers why certain hardware is used to eliminate entirely avoidable failures.  Really glad he brought the subject up.

evofxdwg
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Re: Part of a core foundation
evofxdwg   1/23/2012 9:27:02 AM
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Interesting article. I would also like to see a basic tutorial of how to prevent galvanic corrosion actively with electric current. What are the rules of thumb for current flow or voltage, magnitude/polarity, critical control parameters, reliable connection, etc?  I know such devices exist but not much about them. This information might be useful for protection of metallic pipes in the ground, marine fixed and floating structures, expensive industrial and residential plumbing systems, and any metal structure with dissimilar metals and/or ground/electrolyte contact.  Would this method be any better than the common "sacrificial anode" method in saltwater?

vimalkumarp
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galvanic corrosion
vimalkumarp   1/23/2012 10:23:16 AM
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Thanks a lot for this great article on understandind galvanic corrosion. This is a very important topic in the ever increasing "mechatronics" design and development enviornment. These types of articles are worth their value in gold. This is a must read article.

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