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Dioramas: Techniques
Diorama techniques and related subjects.
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Rusting metallic surfaces
dedalos
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Attica, Greece / Ελλάδα
Joined: April 27, 2006
KitMaker: 89 posts
Armorama: 84 posts
Posted: Thursday, May 03, 2007 - 06:12 PM UTC
Hallo big A modelers.
The following technique was discovered by mistake while attempting to lift the paint from a tiger with the use of an oven cleaner...
I found out that aluminium objects were heavilly coroded by the cleaner called "Fornet".I think it's exactly the same as "Mr Muscle".
Since an image is a 1000 words let me show you the little experiment i performed today.
After shapping the aluminium(coffee can sealer) as desired,i placed it into a sealed bag with the cleaner.





The result was the following amazing texture


As you can see it "ate" the metal all the way through!!



After that,the texture on the material itself is guiding your steps!
Glued and primed with red oxide-





Left it to dry completely~10h
And started painting it.
First a very thin acrylic wash with a mixture of rust matt+leather matt and in some areas with brown matt added to the above.
Preselected areas are then painted with an enamel mix of ~60%flat black+20&gun metal to give a little shine+20% of german grey to make it a little lighter.
Final touch,with CMK pigments "dark rust" and "Vietnam earth", and the result is this.
Putting the pigments on-



Brushing the excess off-




NOTE
After you take it out of the bag brush it with a toothbrush to clean it from the white pouder that is formed on the surface.
WARNING
Put your mask on!!!!!!!!!!!!!!

And there you have it!!!
Fast,easy,simple!!
An other bonus with this technique is that you control the ammount of corrosion you want to accieve by checking it every few hours untill you like what you see and since the cleaner is a foam(not liquid like vinegar) you also control the exact place you want to rust!!
I haven't tryied it yet on another metal like copper but will do and let you know of the outcome!
I hope you like it and find it usefull!!
Tasos
FAUST
#130
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Noord-Holland, Netherlands
Joined: June 07, 2002
KitMaker: 8,797 posts
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Posted: Thursday, May 03, 2007 - 06:20 PM UTC
Ola Tasos

Thanks you for sharing this technique. In my opinion it is a very realistic and overall awesome effect. I like it a lot. Thinjk I'm going to run some tests with this... Quite fun how you can get an accident to work for you.

With friendly greetz

Robert Blokker
slodder
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North Carolina, United States
Joined: February 22, 2002
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Posted: Thursday, May 03, 2007 - 06:27 PM UTC
Now there is a new trick. I think it looks quite good. You should submit it as a feature.
seb43
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Paris, France
Joined: August 30, 2005
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Posted: Thursday, May 03, 2007 - 09:54 PM UTC
I like it
Did you try to do the same with Alu from a Soda Can?
Where you alu is coming from ???

I will try also to check and try to understand how it work nice for the tips
cheers
seb
dedalos
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Attica, Greece / Ελλάδα
Joined: April 27, 2006
KitMaker: 89 posts
Armorama: 84 posts
Posted: Thursday, May 03, 2007 - 11:19 PM UTC
Thank you guys!
@Robert-I consider it to be the most usefull accident ever happened to me!
@Scott-first i'm going to try this "accident" with every kind of metal used by modelers in order to have a better knowledge of its possibilities!
@Sebastien-It is the sealer of an instant coffee can.But the same alu foil can be found in food tins and cans like baby food.I use it all the time since it is easy to bend in any shape without being too thin and fragile.
I'm glad you all found it usefull!
Thanks again for taking the time to answer!
Tasos
seb43
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Paris, France
Joined: August 30, 2005
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Posted: Friday, May 04, 2007 - 01:19 AM UTC
Dear Tasos
Ok I have been checking the formulation of oven cleaner and it contains Sodium Hydroxide. So it is a strong base that can etch the aluminum, the white powder obtain at the end is Aluminum oxide. Copper will not be etch.

It is VERY HAZARDOUS to mix Aluminum with pure sodium Hydroxide because Hydrogen can be generated. In 1986 an aluminum road tanker in the UK was mistakenly used to transport 25% sodium hydroxide solution, causing pressurization of the contents and damage to the tanker. For this same reason aluminium pans should never be cleaned with lye.

2Al(s) + 6NaOH(aq) → 3H2(g) + 2Na3AlO3(aq)

So just be very careful using this method, please wear protective gloves and lenses.

Cheers
Dr Seb
dedalos
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Attica, Greece / Ελλάδα
Joined: April 27, 2006
KitMaker: 89 posts
Armorama: 84 posts
Posted: Friday, May 04, 2007 - 04:59 AM UTC
Thank you for your research and the warning Sebastien!!!!
I'll be more carefull next time!!
The last time i only used a mask....no gloves,no lenses...
Tasos
Grumpyoldman
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KITMAKER NETWORK
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Florida, United States
Joined: October 17, 2003
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Posted: Friday, May 04, 2007 - 05:04 AM UTC
As Sebastien already noted, use caution.

Maybe that's why all my oven cleaners say "Warning- do not use on aluminum surfaces"
JackBlock
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Oregon, United States
Joined: April 13, 2007
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Posted: Friday, May 04, 2007 - 09:35 AM UTC
A very interesting technique with wonderful results. Thank you Sebastien for the words of warning. If anyone uses this also be aware of open ignition sources. Hydrogen + open ignition source= BIG BOOM! .
Cheers

Dave

P.S. It is a pretty cool effect.
seb43
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Paris, France
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Posted: Saturday, May 05, 2007 - 05:38 AM UTC
Well if I can help people with what i Know I am very happy
Happy and safe modeling
seb
Pieter
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Louisiana, United States
Joined: August 14, 2002
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Posted: Saturday, May 05, 2007 - 07:41 PM UTC
Thank you for sharing that. it was very interesting. I have a new trick to use
rotATOR
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California, United States
Joined: November 16, 2006
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Posted: Saturday, May 05, 2007 - 08:46 PM UTC

Quoted Text

Ok I have been checking the formulation of oven cleaner and it contains Sodium Hydroxide



applying science to modelling.. I am impressed Dr. Viale!! I learned something new and useful .. thanks!!
seb43
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Paris, France
Joined: August 30, 2005
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Posted: Saturday, May 05, 2007 - 09:01 PM UTC
Thanks

I am not a talented modeller but a good chemist so I try to help people with what i know.

Cheers
Seb

BTW the Dr title is real
jointhepit
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Oost-Vlaanderen, Belgium
Joined: May 14, 2006
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Posted: Thursday, September 13, 2007 - 08:11 AM UTC
rhanks for sharing, gonna try it asap

Pit

Ps; great result !

HEERMAN
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Newfoundland, Canada
Joined: March 30, 2007
KitMaker: 38 posts
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Posted: Thursday, September 13, 2007 - 08:23 AM UTC
Thanks for the info, very nice.

ED
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