20-01-2013, 05:23 PM
Another resurrected thread...
Just used some oxalic acid to clean some rather mucky bits from a DAC90A that's in the shed - in particular, the cord drum from the tuning capacitor... very rusty, it was...
Ad hoc chemistry - about two not-very-heaped teaspoon-fulls of oxalic acid crystals to about a litre of warm water - stir well with something plastic... Wear gloves and do not inhale the fumes - its toxic stuff - keep it away from animals, food, yourself etc.
Came up magic in about an hour - nice & shiny now... I should really start another thread on this as oxalic acid doesn't really clean brass, so much as leach all the zinc out of it leaving it copper-coloured... its really good at attacking oxides, hence it targets the rust and leaves the steel bits untouched...
Here's a hint - that tub does NOT contain creamy Greek yoghurt. Do NOT put it on your muesli and adding honey to it is a definite no-no
Just used some oxalic acid to clean some rather mucky bits from a DAC90A that's in the shed - in particular, the cord drum from the tuning capacitor... very rusty, it was...
Ad hoc chemistry - about two not-very-heaped teaspoon-fulls of oxalic acid crystals to about a litre of warm water - stir well with something plastic... Wear gloves and do not inhale the fumes - its toxic stuff - keep it away from animals, food, yourself etc.
Came up magic in about an hour - nice & shiny now... I should really start another thread on this as oxalic acid doesn't really clean brass, so much as leach all the zinc out of it leaving it copper-coloured... its really good at attacking oxides, hence it targets the rust and leaves the steel bits untouched...
Here's a hint - that tub does NOT contain creamy Greek yoghurt. Do NOT put it on your muesli and adding honey to it is a definite no-no
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