View Comments: Oldest First|Newest First|Threaded View
<<  <  Page 2/2
Dave Palmer
User Rank
Re: Part of a core foundation
Dave Palmer   1/23/2012 11:26:58 AM
@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.

User Rank
Re: Part of a core foundation
evofxdwg   1/23/2012 11:41:22 AM
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!

William K.
User Rank
Understanding galvanic corrosion.
William K.   1/23/2012 4:05:27 PM
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.  

Charles Murray
User Rank
Re: Part of a core foundation
Charles Murray   1/23/2012 7:39:55 PM
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.

Alexander Wolfe
User Rank
Re: Part of a core foundation
Alexander Wolfe   1/23/2012 10:26:09 PM
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.

<<  <  Page 2/2

Partner Zone
Latest Analysis
The company says it anticipates high-definition video for home security and other uses will be the next mature technology integrated into the IoT domain, hence the introduction of its MatrixCam devkit.
Siemens and Georgia Institute of Technology are partnering to address limitations in the current additive manufacturing design-to-production chain in an applied research project as part of the federally backed America Makes program.
Most of the new 3D printers and 3D printing technologies in this crop are breaking some boundaries, whether it's build volume-per-dollar ratios, multimaterials printing techniques, or new materials types.
Check out these gifts that will make you the hero of your Secret Santa party.
Voting has closed on our 2015 Gadget Freak of the Year contest, but it is not game over yet for two competing projects.
Design News Webinar Series
11/10/2015 11:00 a.m. California / 2:00 p.m. New York
10/29/2015 11:00 a.m. California / 2:00 p.m. New York
10/20/2015 8:00 a.m. California / 11:00 a.m. New York
12/2/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 6 - 10, Building Raspberry Pi Controllers with Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7

Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service