RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: Ba5h on January 14, 2015, 12:36 PM
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Hi guys I have recently put my mongoose in a citric bath which worked quite well but as I only get 10 mins here and there to play bikes I took the frame out and just stood it to dry and now when I came to polish it last night it seems to have water marks that will not polish out "nono" I think its nickel plated as doesn't have tje shine of chrome and now it has spots too :( anyone had this problem or am I the only dunce in the room :idiot2:
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Would try putting it back in the CA bath as a starting point
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I have put it back in overnight will check later :daumenhoch:
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don't let it dry, get it washed off straight away with clean water and get a rag on it
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I will defo be cleaning it off this time but if it doesnt work then I think we should add to the how to thread just soothers dont do the same :idiot2: I should give myself more time to play ::)
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Update!!! Has made no difference I still have water spots I am gonna add some more acid and see what haopens does the effectiveness wear off??? :-[
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Got any pics of the 'water marks'?
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Can you put some photos up? Might help if we can see what you're seeing :daumenhoch:
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I'll stick my chemistry head on here - if I remember correctly citric acid (C6H8O7 if you want to get tech) reacts with nickel oxide (NiO) Nickel is resistant to Citric acid, however, Nickel oxide is not.
In short, if your frame is knackered be wary that the Citric doesn't make it end up looking like its had its shiny stripped when it reacts with the NiO, removing the oxide would give the effect of removing the shininess........
I found out the hard way with a nickel plate BB and some random brake bits that lost their shine......... You can see what it did to the locking rings.
(Forgot to mention, don't use acetic acid (vineger) on nickel, or nickel alloys, it will dissolve them........)
(http://i966.photobucket.com/albums/ae142/brettfellows/DSC00994_zpsca1d5b26.jpg) (http://s966.photobucket.com/user/brettfellows/media/DSC00994_zpsca1d5b26.jpg.html)
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Ok guys I will be back with pics in a bit
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Sorry for rubbish pic but in the bottom of the pic is the marks before polishing and on the top is after some serious welly with the polish I just cant budge the halo >:(
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Try a citric bath, followed by a bath full of bicarbonate of soda to neutralise the acid - remove and rinse. Should hopefully work as the citric should remove the water spots.......
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And while its in the citric bath, give it scrub with a toothbrush, might help to shift the marks :daumenhoch:
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In theory if the citric acid caused they dry spots it should also remove em :chin:
would deffo give it a scrub while submerged :daumenhoch:
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Cheers guys I will give it a go
does the effectiveness of the acid wear off should it be replaced ??
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I've had my citric bath sitting for a month or so now, still working fine :daumenhoch:
Wouldn't do any harm to stir it up though.
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:daumenhoch:
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Its no good I still cant get rid of the halo it seems to have burnt the finish so it wont polish
"nono"
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Dunno mate.
What polish are you using?
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If the "water" marks are Nickel Oxide they will be hard - much like Nickel ;D and you might struggle to polish them out, much as you'd struggle to polish the Nickel off the frame by hand........ Try rubbing the affected areas with white vinegar to dissolve the oxide and then rinse it well if it works. Got to be worth a shot? I see similar with brush nickel plated taps sometimes.....
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Ok I will give that a go im using peek polish and tin foil and antthing else I can rub with lol it is defo better once Iused foil :D
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foil will be leaving new light scratch marks.
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It does leave very light marks but appears the best thing to polish the marks with and then going over with clothgets most of the scratches out :)
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powdercoat it :LolLolLolLol:
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In the pic of the bb and the cigarette box their doesn't appear to be much nickel left, more bare metal.
I know it's not cheap but maybe the only way around it is to have it re- nickel'd.
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Yeah there is nothing left down on that bit I was trying to keep it survivor condition just cleaned up ect so its far from a show piece I just hoped I could get rid of the water marks its defo a lesson learnt :loser: just hope it doestn happen to anyone else, its completely my own fault as should habe caned and dried it and polished it straight away as you would with most things I'm an :nickswan: