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Rusted magnet recone |
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Risc_Terilia 
Young Croc 
Joined: 15 December 2007 Status: Offline Points: 699 |
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 Topic: Rusted magnet reconePosted: 18 February 2017 at 5:56pm |
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I've got a PD154 that i'm trying to recone but there's oxidation to the magnet (even looks to be inside the voicecoil gap), will this cause it to fail again immediately or at all?
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Risc_Terilia
Young Croc
Joined: 15 December 2007 Status: Offline Points: 699 |
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Posted: 19 February 2017 at 5:01pm |
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We'll I've filled the vociecoil gap with vinegar now so there's no going back
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70,s hero
Young Croc
Joined: 14 December 2014 Location: bristol Status: Offline Points: 637 |
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Posted: 19 February 2017 at 7:38pm |
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use some very fine wet and dry paper wrapped around a thin piece of pastic and clean out he gap, vinegar will just corode it more, oxallic acid in the form of rust remover will clear surface rust but be aware... if you leave any material within the magnetic gap then it may well cause the speaker to fail and very quickly, you need to be able to see that there is nothing at all in the gap, I have used double sided sticky tape to insert in to the gap and then move it around the circumference, do this several times, any metal based material will be stuck to the surface due to the magnet and so it is important to doubke check it is completely clear.
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Top banana
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MattStolton
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Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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Posted: 19 February 2017 at 7:59pm |
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Get the vinegar, and anything else acidic out. Wash/dilute with water....
Dry it thoroughly, but don't heat excessively, as at some high temperature, you will lose all magnetism. Cool hairdryer, not oven. Bit of Wd40 can do wonders to prevent further oxidation, but you want nothing left in voice coil gap. Equally, anywhere you want glue to work, you do not want silicone residue from wd40, as it is slippy, so glue won't stick. Banging in acid to slight oxidation of the zinc/chrome plating is about as bad as you could have done. It will have chewed at the plating, and attacked the metal under it. |
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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valve head777
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Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1781 |
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Posted: 19 February 2017 at 8:06pm |
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Would a little spray of zinc etch primer be worth trying? Only issue i see maybe heat damaging it, but if corrosion is bad maybe a last ditch chance.
Also, use a bicarbinate solution to neutralize the acid. Edited by valve head777 - 19 February 2017 at 8:08pm |
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Freedom of choice, choice of freedom.
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ceharden
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Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Posted: 19 February 2017 at 9:11pm |
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Corrosion doesn't actually look that bad in the original picture. I'd have just cleaned the gap out to remove any loose material and left it alone.
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Risc_Terilia
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Posted: 19 February 2017 at 10:05pm |
Well if that's what it takes to get people to reply...
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nickyburnell
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Posted: 22 February 2017 at 3:57pm |
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Done plenty rusty hf250 with wet and dry and wd40. Always worked.
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It's everything, not everythink!
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MattStolton wrote: