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Author Topic: Another Witches Brew :)  (Read 6322 times)

Offline AshimotoK0

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Another Witches Brew :)
« on: April 15, 2015, 07:52:32 AM »
Got loads of spokes to re-plate and was concerned about hydrogen embrittlement using strong acids to remove the old zinc plate so have this  'witches'  brew to try, instead :-

To make up 1 litre of stripping solution:-

100 grammes ---  Sodium Hydroxide  (Source B &Q, Wilkinsons, ect)

90 grammes --- EDTA---- (EthyleneDiamineTetraAcetic acid)  Source:   http://www.ebay.co.uk/itm/130544728488?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

4 grammes ----  Trimetholamine --- Source :    http://www.ebay.co.uk/itm/321368003934?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Immersion is at 70 degrees C +/- 5 degrees.

Will let you know how I get on.

Ash
« Last Edit: May 17, 2015, 08:23:05 PM by AshimotoK0 »
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Offline Nurse Julie

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Re: Another Witches Brew :)
« Reply #1 on: April 15, 2015, 10:31:32 AM »
BANG   :o :o :o :o :o
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Offline AshimotoK0

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Re: Another Witches Brew :)
« Reply #2 on: April 15, 2015, 10:56:43 AM »
On the Triethanolamine. My chemist mate told me I would never be able to source it because terrorists use it in one of their own 'brews'. One minute later I found it on eBay and ordered for a fiver. Don't you just love eBay sometimes !

Ash

 Mis-spent childhood of the Ashimoto man with one of these:-

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« Last Edit: April 15, 2015, 11:07:42 AM by AshimotoK0 »
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“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline LesterPiglet

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Re: Another Witches Brew :)
« Reply #3 on: April 15, 2015, 11:15:37 AM »
Ahh, I loved christmas. Chemistry and microscopes. My parents must have thought I was a weirdo. :)
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Offline RGP750

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Re: Another Witches Brew :)
« Reply #4 on: April 15, 2015, 12:44:10 PM »
Good job someone can understand it.
Chemistry was never a strong point ;D ;D
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Offline Bitsa (Ralph Wright - RIP)

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Re: Another Witches Brew :)
« Reply #5 on: April 15, 2015, 01:46:19 PM »
With you there mate ;D
Cheers
Bitsa
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Offline Trigger

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Re: Another Witches Brew :)
« Reply #6 on: April 15, 2015, 09:26:54 PM »
All looks very dangerous to me  ;D ;D ;D
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Offline AshimotoK0

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Re: Another Witches Brew :)
« Reply #7 on: May 14, 2015, 10:57:12 PM »
Well just got the EDTA in a 500g lot after waiting ages for the eBay supplier to deliver . Running at 70 degrees C it strips the zinc plating fairly quickly and beautifully.. good result and fairly inexpensive. Probably about 5.5 GBP for 2.5 litres of the 'brew'.
This is from a British Coal Board spec. for removing the plating on the steel fasteners used for holding together large conveyor belts without causing hydrogen embrittlement.

Ash
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Offline UK Pete

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Re: Another Witches Brew :)
« Reply #8 on: May 15, 2015, 07:08:54 AM »
Thats great stuff ash , i might buy some myself
pete
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Offline AshimotoK0

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Re: Another Witches Brew :)
« Reply #9 on: May 17, 2015, 08:21:10 PM »
Spent quit a few hours stripping the zinc  plate off lots of parts over weekend with the 'brew' and really pleased with it's performance. Definitely worth getting your mitts on an old slow-cooker and giving it a try out instead of hydrochloric acid.

I know some people think I have some mad ideas  :-[  but this is one of the better ones !

Ash   
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“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.
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