FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   PreferencesPreferences   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Forum index » Science and Technology » Chem » Coatings
DC Polarization test set up for epoxy coatings
Post new topic   Reply to topic Page 1 of 1 [2 Posts] View previous topic :: View next topic
Author Message
Frederik de Wit
science forum beginner


Joined: 06 Sep 2005
Posts: 1

PostPosted: Tue Sep 06, 2005 9:26 am    Post subject: Re: DC Polarization test set up for epoxy coatings Reply with quote

Well, your coating has a very high resistance and as far as I know
Tafel plots only show up under special conditions. One of the conditions
being that you have some kind of e-chem reaction at your surface.
With EIS you can show the water take-up of the coating but that's about it.
Try reading the publications by Van Westing from our group (beginning of
the nineties).

Good luck!
Frederik

TU Delft, The Netherlands

Quote:
Hi


I am using DC polarization flat cell test set up to measure corrosion
current of Aluminum coupons coated with epoxy(modified clay
nanocomposite). The problem is that when I use the three electrode flat
cell set up on these coatings, the plot generated is not a tafel plot.
I just get a vertical plot like a noise plot.I know my settings are
right because when I tested are Al with the same connections, I got a
good tafel plot.

Does this mean that my coatings are too thick for DC polarization test
?
Is there any limit to the thickness of the coating that can be tested
by DC polarization set up?
I am also going to test these coatings EIS set up.


Thanks.
Any insight into DC pol test will be appreciated.
Back to top
slpammi
science forum beginner


Joined: 04 Sep 2005
Posts: 3

PostPosted: Sun Sep 04, 2005 4:00 pm    Post subject: DC Polarization test set up for epoxy coatings Reply with quote

Hi


I am using DC polarization flat cell test set up to measure corrosion
current of Aluminum coupons coated with epoxy(modified clay
nanocomposite). The problem is that when I use the three electrode flat
cell set up on these coatings, the plot generated is not a tafel plot.
I just get a vertical plot like a noise plot.I know my settings are
right because when I tested are Al with the same connections, I got a
good tafel plot.

Does this mean that my coatings are too thick for DC polarization test
?
Is there any limit to the thickness of the coating that can be tested
by DC polarization set up?
I am also going to test these coatings EIS set up.


Thanks.
Any insight into DC pol test will be appreciated.
Back to top
Google

Back to top
Display posts from previous:   
Post new topic   Reply to topic Page 1 of 1 [2 Posts] View previous topic :: View next topic
The time now is Tue Oct 17, 2017 5:43 am | All times are GMT
Forum index » Science and Technology » Chem » Coatings
Jump to:  

Similar Topics
Topic Author Forum Replies Last Post
No new posts test bill11 Math 1 Fri Jul 14, 2006 8:44 pm
No new posts test lesterzick@cableone.net Math 0 Wed Jul 12, 2006 5:48 pm
No new posts low ionics epoxy ratman Chem 1 Tue Jul 11, 2006 12:54 am
No new posts test - ignore matt271829-news@yahoo.co. Undergraduate 1 Mon Jul 10, 2006 10:32 pm
No new posts Free automatic UNIVERSAL objective test/inventory/survey ... sci_guy Math 0 Sat Jul 08, 2006 10:34 pm

Copyright © 2004-2005 DeniX Solutions SRL
Other DeniX Solutions sites: Electronics forum |  Medicine forum |  Unix/Linux blog |  Unix/Linux documentation |  Unix/Linux forums  |  send newsletters
 


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0183s ][ Queries: 20 (0.0036s) ][ GZIP on - Debug on ]