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June 27, 2017, 12:32:47 PM
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 21 
 on: June 12, 2017, 11:05:57 AM 
Started by Hermes - Last post by BoogieMonster

 22 
 on: June 12, 2017, 09:52:10 AM 
Started by Rigil Kent - Last post by Mefiante
AFAIK, Silvo is purely chemical (and quite corrosive on base metals), whereas Brasso includes an extremely fine-grained abrasive powder in suspension.  I expect you’ll have more joy with Brasso than with Silvo.  Careful application of water paper or steel wool could also help with tough spots.

'Luthon64

 23 
 on: June 12, 2017, 09:20:34 AM 
Started by Rigil Kent - Last post by Spike
Mefiante to the rescue!  Thanks, I'll try soaking in spirit vinegar first since I use it extensively for household cleaning anyway.  When I get to the polishing part - is there any benefit in using a metal polish like Silvo? I have some pewter with tarnish and I've polished the hell out of it with no effect.

My neighbour (geology student) suggested Brasso for the aluminium tools which I thought a little strange.



 24 
 on: June 12, 2017, 07:11:47 AM 
Started by Rigil Kent - Last post by Mefiante
Sounds like oxidised aluminium alloy to me.  You can try a mild acid like lemon juice or spirit vinegar first, and if that doesn’t do it, you can try some pool acid (Caution: use the latter sparingly with rubber gloves; the reaction is fierce and exothermic).

I doubt you’ll be able to remove the stains completely by chemical means alone without substantial polishing effort.  There’s a lamb’s wool polishing attachment for an electric drill that may prove helpful.

'Luthon64

 25 
 on: June 11, 2017, 12:46:28 PM 
Started by Rigil Kent - Last post by brianvds
How do I clean this? It's rather attractive and unusual. Alkali? Acid? Please excuse my utter ignorance. Will a photo help?

I don't know if it will help, but I would certainly be curious to see some photos...

 26 
 on: June 11, 2017, 09:21:27 AM 
Started by Rigil Kent - Last post by Spike
Totally off-topic, but I don't have even a rudimentary knowledge of chemistry: I have some gardening hand tools that appear to be made of some sort of shiny aluminium alloy. Appears to be solid, not hollow, yet is quite light. Probably manufactured by some sort of a hot moulding process, they were not forged. They got left in damp/musty conditions and have acquired extensive oxidation in the form of hard, whitish spots and areas ("RUST"). It feels very rough. It can't be removed by ordinary washing or scrubbing with household cleaners.  Even when the oxidation is laboriously removed, the metal retains a tarnished look. I tried metal polish (Silvo) but the hard residue defeated me. I spotted a pinprick of (real) rust on the back of one of the tools. Painting it with an anti-rust paint will totally spoil it and is not an option.

How do I clean this? It's rather attractive and unusual. Alkali? Acid? Please excuse my utter ignorance. Will a photo help?

 27 
 on: June 09, 2017, 17:16:25 PM 
Started by GCG - Last post by BoogieMonster

 28 
 on: June 06, 2017, 14:03:02 PM 
Started by Tweefo - Last post by BoogieMonster
The totals keep climbing.

 29 
 on: June 06, 2017, 07:44:59 AM 
Started by The Vulcan - Last post by Rigil Kent
Waiting for the court's decision.

 30 
 on: June 05, 2017, 08:58:24 AM 
Started by The Vulcan - Last post by BoogieMonster
Does anybody have any info on any developments?

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