dann2
International Hazard
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
Electroplating Iron
Hello,
Anyone done any Iron plating?
I attempted the following from US Pat. 3,850,701
_______________________________
Etched Ti.
Electro-deposition was carried out for 19 min in an electrolyte at 25C consisting of 130 g/l of ferrous sulfate (heptahydrate), 100 g/l of ammonium
sulfate and 6 g/l of formalin by using said titanium plate as a cathode (a cathodic current density = 2.5 A/dm squared) and a low carbon steel as an
anode.
_____________________________
Coating should be about 12 micron thick.
It did not work. I got a few streaks of Iron in Ti.
Perhaps stirring might help. The Iron Sulphate formed
hydroxide when dissolving so I will try acidifying water.
Dann2
|
|
|
Lambda
National Hazard
Posts: 566
Registered: 15-4-2005
Location: Netherlands
Member Is Offline
Mood: Euforic Online
|
|
Hi @dann2,
Here are a few Books that may be of interest to you that can be downloaded via @Madhatter's FTP services in the Folder;
UPLOAD / Lambda / Electroplating /
as
ElectroPlating 101.pdf (4.7MB)
ElectroPlating - By Henry C. Reetz (H.H. Windsor 1911 - Republished by Lindsay Publications 1989) 99p - Revised and Up-To-Date by Popular
Mechanics.pdf (21.5MB)
Workshop Practice Series # 11 - Electroplating - By J. A. Poyner (Argus Books - 1987 - Repr. 1991) 31s(d).pdf (4MB)
Vigor's Plating Guide (Grobet USA - 1999) 24s.pdf (12.3MB)
Furthermore, here are also a few Books and Patents on ElectroPlating. Chose FTP for the download, for then you may determine yourself in which format
you want the files in.
http://www.archive.org/search.php?query=Electroplating
Enjoy !!
Lambda.
|
|
|
Rosco Bodine
Banned
Posts: 6370
Registered: 29-9-2004
Member Is Offline
Mood: analytical
|
|
cathodic preparation of titanium
There are cathodic etching / hydriding schemes which are applicable to plating of titanium and other metals .
It is possible to do this in a plating bath by first applying a low cathodic voltage to etch and hydride the metal ,
and then increasing the voltage to quickly deposit the metal plating so that a good metal to metal interface is produced .
Patents of possible interest concerning this technique are
US5368719 , US5456819 , US2801213 , US4153742 .
Pourbaix diagrams for titanium below were found here
http://www.engr.sjsu.edu/WofMatE/projects/srproject/srproj5....
[Edited on 9-8-2007 by Rosco Bodine]
|
|
|
chemist1066
Harmless
Posts: 3
Registered: 21-8-2007
Member Is Offline
Mood: No Mood
|
|
Go to a good library and look up some books on electroplating. There is Iron plating, however it is rare. If you are trying something at home, may I
suggest trying Iron (II) sulfate with some citric acid.
|
|
|
dann2
International Hazard
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
Thanks for replys guys,
I got back to the plating using my original formula. This time I stirred and kept the Ti brushed with a tooth brush. Got a good coating though there
are still quite a lot of small pits (visible under microscope) in the coating. They do not go all the way down to the Ti though.
The original patent said the Ti was polished, I polished a piece of Ti using cardboard wheel and Cerium Oxide (polish) and coated. The Iron coat was
easy to flake off. Bad idea, better to just etch in HCl.
Need to get my 900c (or so + steam in) oven going to convert to Magnetite and see if it stands up in a Chlorate cell.
If so it may be a better way to go than the Doped Tin Oxide precoat.
About the (wonderfully mysterious) Pourbaix diagrams.
Am I enterpreting the diagram correctly when I say that Ti will corrode in acid conditions when used as a Cathode (-ve approx 0 to -1.8 volts). Are
the 'volts' as we see them applied are would they be measured with respect to some third electrode, like SCE.
?
Cheers,
Dann2
[Edited on 1-10-2007 by dann2]
[Edited on 1-10-2007 by dann2]
|
|
|
Rosco Bodine
Banned
Posts: 6370
Registered: 29-9-2004
Member Is Offline
Mood: analytical
|
|
| Quote: | Originally posted by dann2
About the (wonderfully mysterious) Pourbaix diagrams.
Am I enterpreting the diagram correctly when I say that Ti will corrode in acid conditions when used as a Cathode (-ve approx 0 to -1.8 volts).
|
Correct . There is a window condition of mild cathodization potential where passivation is prevented , and still the potential has not yet reached
the negative value required for hydrogen evolution blanketing or hydride formation .
In that window condition the bare metal is exposed to direct reaction , dissolution by acids , as well as ( I would expect ) to being plated by metals
via "electroless" sorts of double decomposition reactions . This could also be exploited to secure metal to metal interfaces by schemes which rapidly
transition the applied negative potential upon the exposed and unpassivated bare metal to a condition of being plated with other metals
electrolytically , in preference to hydride formation as would occur otherwise in a bath which was simply acidic rather than being a salt solution of
the metal to be plated .
| Quote: |
Are the 'volts' as we see them applied are would they be measured with respect to some third electrode, like SCE.
?
Cheers,
Dann2 |
The usual uncertainty would apply here as to any charts which fail to provide test cell description specifics , it is good only for showing
relationships as a trend . You would need to derive your own multiplier as would apply to your own particular cell configuration for translation of
what these values are in relation to your own cell . Gotta love that huh 
There's a lot of that in electrochemical charts .......
particularly where the test apparatus is not described for
the conditions under which the charted values were measured . Your results may vary according to the phases of the moon , astrological influences ,
ect .
BTW the Pourbaix diagram for iron is on the same page linked above where the diagrams for titanium were gotten .
Pourbaix is a funny name , and when I see it , I can't help wondering if the other children called him "poor boy" , or
"po beau" or something to that effect . 
[Edited on 3-10-2007 by Rosco Bodine]
|
|
|
dann2
International Hazard
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
Hello,
There is a Pourbaix Diagram for Lead Dixoide here in relation to sulphate ion:
http://www.geocities.com/CapeCanaveral/Campus/5361/chlorate/...
I have no idea if it is helpful to us.
The word 'Pourbaix' is pronounces as the sound that a duck makes when it is stepped on my a horse (or so I believe).
PAOR BAIXX
Dann2
|
|
|
davetshave
Harmless
Posts: 1
Registered: 29-11-2007
Member Is Offline
Mood: In the groove
|
|
I was wanting to look at those documents mentioned by Lambda. Can you provide some information on the location of Madhatters ftp server please?
|
|
|
conta6ion
Harmless
Posts: 1
Registered: 23-9-2011
Member Is Offline
Mood: No Mood
|
|
The conditions are theoretical... but quite useful for modelling. The voltages you see are with reference to a standard hydrogen electrode (0.0V). If
you are using something other than this your reference voltage will be different, and the voltage expectations need to be altered accordingly. Added
to this is nearly always an overvoltage which is necessary to accommodate for whatever issues are not perfect within the plating cell. This includes
things like concentration gradients and side reactions.
|
|
|
White Yeti
National Hazard
Posts: 816
Registered: 20-7-2011
Location: Asperger's spectrum
Member Is Offline
Mood: delocalized
|
|
You can electroplate iron onto copper. The trick is that you have to electroplate reactive metals onto a less reactive substrate (relatively). So in
this case copper works like a charm. But why do you want to electroplate iron? I'm just curious....
I'll post some pictures if you'd like.
|
|
|
dann2
International Hazard
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
I was electroplating Titanium. The Iron was then turned into Magnetite for an Anode.
|
|
|
EmilyWatson
Harmless
Posts: 1
Registered: 1-12-2011
Location: KKKggg555
Member Is Offline
Mood: No Mood
|
|
I have tried copper plating. Have anyone here done it before I would really like to share the theories. I connected the lid to the negative side of
a 1.5 volt power supply and dipped into the blue vitriol .I used a length of copper tubing for my anode.
Power Supplies
[Edited on 2-12-2011 by EmilyWatson]
Emily Watson
|
|
|
cyanureeves
National Hazard
Posts: 737
Registered: 29-8-2010
Location: Mars
Member Is Offline
Mood: No Mood
|
|
great stuff lambda. thank you.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
