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Zinc plating small parts

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AshimotoK0:
Yes You need some sodium Hydroxide pellets from Poundshop or similar ... Wilco sell it too.

Plus these:

http://www.ebay.co.uk/itm/200g-EDTA-disodium-salt-dehydrate-Ethylenediaminetetraacetic-acid-top-quality-/130820963952 OR
 http://www.ebay.co.uk/itm/EDTA-1kg-60-00-4-/291811092313?hash=item43f14be759:g:dd4AAOSw5b1XI0x1

http://www.ebay.co.uk/itm/like/322081465880?lpid=122&chn=ps&googleloc=1006816&poi=&campaignid=207297426&device=c&adgroupid=13585920426&rlsatarget=pla-156022119906&adtype=pla&crdt=0

You need to use at around 70 °C ...I use an old Slow Cooker.

I will look up the mix ratio for you.

Before someone chips in . Yes you can use phosphoric and and second hydrochloric acid (brick cleaner) but the latter tends to be harsh on the substrate material (steel). Both work OK but I prefer my brew on delicate components and it's what is used in hi-tech industrial use and TBH phosphoric is about the same price.

AshimotoK0:
To make up 1 litre of stripping solution:-

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

90 grammes --- EDTA---- (EthyleneDiamineTetraAcetic acid)  Source .........:- see above post

4 grammes ----  Triethanolamine   ..........Source :- see above post

Immersion is at 70 degrees C +/- 5 degrees for about 20 minutes (basically until the bubbling stops).

Slow cookers are mega cheap (Lidl, Aldi, loft  ;D) and will not overheat the solution on max. setting.

Specify if you need passivate finish either Gold chromate or bluish tinge clear (example of gold chromate are  regulator cover, spoke nipples). Sometimes you get black passivate. Examples of black pass.  are 'D' spacer washers on 500/4 & 750/4 top yokes and the earthing covers on USA 500/4 rear indicator brackets. But the bluish tinge passivate is used for most parts.

triplE675:
Thanks
Ash

Sent from my D2203 using Tapatalk

Nurse Julie:
It's not really necessary to remove the original Zinc. If you don't fancy Ash's Witches Brew, which I'm sure would work very well, you can just loosen the dirt / grease with Jizer or similar and wire brush the dirt off.

AshimotoK0:

--- Quote from: Nurse Julie on July 10, 2016, 08:40:59 PM ---It's not really necessary to remove the original Zinc. If you don't fancy Ash's Witches Brew, which I'm sure would work very well, you can just loosen the dirt / grease with Jizer or similar and wire brush the dirt off.

--- End quote ---

Hmmm ..think you are asking for trouble there Julie ..well with Allenchrome anyway but hey ho whatever.

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