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oxidised aluminium
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oldboy



Joined: 20 Mar 2018
Posts: 10
Location: Retford

PostPosted: Sun Oct 20, 2019 1:36 pm    Post subject: oxidised aluminium Reply with quote

My recently acquired restoration project has been stored badly in the previous owners garden and consequently lots of the engine casting and ancillaries are heavily corroded. The engine runs perfectly and I don't really wish to strip it down to polish everything (not yet at least) so can anyone recommend a product to remove the corrosion from the aluminium that will not affect other components that might get hit by any overspray.
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ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Sun Oct 20, 2019 3:08 pm    Post subject: Reply with quote

Hydrochloric acid is the best stuff for removing aluminium oxide, regarding effect on other materials it will react with steel , and is used to also remove ferrous corrosion, but not in the time that will be required to remove the aluminium oxide it will erode brass slowly (its used to polish brass).

Keep it away from enamel paint, should be ok with acrylic paint.

Available from all builders merchants, sold as "Brick Cleaner" it's not intended to clean dirty bricks, but to remove mortar stains. Make sure you get brick cleaner thats acid based, and not some new fangled environmentally friendly rose smelling nonsense!

Brush it on, agitate it where the corrosion is heavy, rinse off with tap water, repeat as required. Eye and skin protection essential.

Dave
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oldboy



Joined: 20 Mar 2018
Posts: 10
Location: Retford

PostPosted: Sun Oct 20, 2019 5:59 pm    Post subject: Reply with quote

Thanks, I'll pop down to my local builders merchant tomorrow and see what they have in stock.
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roverdriver



Joined: 18 Oct 2008
Posts: 1146
Location: 100 miles from Melbourne, Victoria, Australia

PostPosted: Mon Oct 21, 2019 6:45 am    Post subject: Reply with quote

Also known as 'Spirits of Salts' and used to be a popular agent to clean metal for soldering.
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