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.
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.
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.
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.
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.
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?
@evofxdwg: Yes, it's definitely possible to prevent corrosion using impressed DC current. This is done mainly for large structures; it tends not to be practical in smaller applications. Of course, this works the other way around, too: stray currents in the water can accelerate corrosion of outboard engines, for instance. A good source of information on designing cathodic protection systems for structures is U.S. Army Corps of Engineers Technical Manual 5-811-7, which can be found online.
Thanks for that reference Dave Palmer. I will definitely look into it. I became interested in the subject several years ago when i installed a Ground Source Heat Pump in my home. I was interested in how to protect metallic pipe in the ground, or immersed in a well. Well water is mildly acidic in my area. But im assuming pipe in the ground in contact with various types of sand/clay might be a different, more complex problem. Metallic pipe, or an immersed metallic coil heat exchanger would be much better for heat transfer than the recommended formulation of poly pipe recommended by the Ground Source Heat Pump industry. (After looking at the problem a bit, i decided only titanium might be viable. I did not install metallic pipe because i could not obtain a cheap source of surplus titanium tubing or coils, nor reliably solve the interconnection problem due to corrsion of clamps)
PS: WOW I just looked at that document - way more info than i found before. I will digest it at home thoroughly!
Good point, Beth. When I studied engineering, we took two semesters of chemistry and one of material science (or metallurgy, which was more typical back then), but the chemistry of corrosion was never discussed, as I recall. Very nice article.
In EE, we had two semesters of chemistry in freshman year. (Never got a lot of use out of it or learned much.) We had no metallurgy at all, no materials science. I guess that was in the ME curriculum, but from reading Dave's excellent piece here, I can see that some exposure would've been beneficial. I guess everything eventually returns to its base form if exposed to the elements long enough.
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.
This is a simple and yet very informative write up. THANKS! It would have been useful for some of the engineers at Chrysler Corp to have been a bit more familiar with this a few years ago. The corrosive failure mode of extruded aluminum alloy bumpers is very impressive, in addition to being quite discouraging. Of course, sea water is not nearly as salty as the saturated brine solution found on our Southeast Michigan roadways every winter. So of course, just because cars might survive a dunk in the ocean idoes not mean that they would last very long here.
Probably it would be a good idea for all schools offering engineering courses to add a course in corrosion, and to put it at a senior level.
A slew of announcements about new materials and design concepts for transportation have come out of several trade shows focusing on plastics, aircraft interiors, heavy trucks, and automotive engineering. A few more announcements have come independent of any trade shows, maybe just because it's spring.
Samsung's Galaxy line of smartphones used to fare quite well in the repairability department, but last year's flagship S5 model took a tumble, scoring a meh-inducing 5/10. Will the newly redesigned S6 lead us back into star-studded territory, or will we sink further into the depths of a repairability black hole?
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