Cleaning up spring pan - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 3 Weeks Ago Thread Starter
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Cleaning up spring pan

Hi
So Iíve removed a spring pan to de-rust and apply rust proofing and see that there are 2 holes in the underside with rust inside. Do you have any tips on removing rust from the inside cavities?
Thanks
Ian
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(Post Link) post #2 of 8 Old 3 Weeks Ago
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Get yourself some Bilt Hamber http://https://www.bilthamber.com/deox-c Deox-C powder, mix it up and bung the lot into a bucket, leave for a few days, rust will be either gone or converted to an inert substance that give a bit of rust protection then paint and spray Dynax wax into cavity to prevent it re occurring
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(Post Link) post #3 of 8 Old 3 Weeks Ago
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Or just use 100g of citric acid to 900ml of hot water (probably the same as Bilt Hamber but a fraction of the price and you can buy it on Amazon). If you can keep the solution warm in a bucket using something like a beer making heating belt it will work even quicker. I did my from front hub carriers (and many other parts) this way. Worked a treat. Also used the Dynax wax inside my front sub frame (unfortunately not able to citric acid treat that that though!) very easy with the long flexible spray tube that comes with it.
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(Post Link) post #4 of 8 Old 2 Weeks Ago Thread Starter
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Thanks for the advise.

I used the bilthamber first in a ratio 10:1 which went black after 24 hours which I understand means itís exhausted itís effectiveness.

Before
Attachment 893319

Attachment 893321
After
C58B1FEA-2436-426F-B968-854B8A92F73A.jpg

F6672BC3-2CCC-40EB-A013-717FC07B4B0E.jpg

Iíve now mixed up another batch of solution and weíll see if thereís any further improvement over the next couple of days.

So this is after 96 hours in the new bithamber mixture.

DSC_0065.jpg

DSC_0068.jpg


Iíll try the citric acid on the other side

So this is after the same amount of time in citric acid 1kg to 5 litres water.
I think this is marginally better than the Bilt Hamber
Unfortunately it revealed some holes so the pan is scrap
C652E57F-5EEB-436D-8A4E-E9A716D49F7F.jpg
A6683429-EE56-4B33-B3F3-A35043697C6E.jpg



Ian

Last edited by iansl2000; 12 Hours Ago at 13:58.
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(Post Link) post #5 of 8 Old 2 Weeks Ago
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Originally Posted by v6coop View Post
Or just use 100g of citric acid to 900ml of hot water (probably the same as Bilt Hamber but a fraction of the price and you can buy it on Amazon). If you can keep the solution warm in a bucket using something like a beer making heating belt it will work even quicker. I did my from front hub carriers (and many other parts) this way. Worked a treat. Also used the Dynax wax inside my front sub frame (unfortunately not able to citric acid treat that that though!) very easy with the long flexible spray tube that comes with it.
Food grade citric acid !?

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(Post Link) post #6 of 8 Old 2 Weeks Ago
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You could try using this method.


My brother has used the washing soda method to recover all sorts of iron objects, he however used a variable voltage and current transformer I got for him from Italy. That gives more control than an ordinary battery charger.

I've seen the method used in an industrial museum to renovate large and small items.
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(Post Link) post #7 of 8 Old 2 Weeks Ago
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Originally Posted by iansl2000 View Post
Thanks for the advise.

I used the bilthamber first in a ratio 10:1 which went black after 24 hours which I understand means it’s exhausted it’s effectiveness.



I’ve now mixed up another batch of solution and we’ll see if there’s any further improvement over the next couple of days.

I’ll try the citric acid on the other side.

Ian
The black colour doesn't necessarily mean it is exhausted but it is certainly a good idea to get as much rust off as you can with a wire brush first and if it does go black wire brushing this off as well. There are two things that will speed up the process. Using a more concentrated solution (try 15% as per Bilt Hamber instructions) or keeping the solution warm. If you can do the latter it will certainly help but isn't always easy. If you can drain some or all the solution off every now and again and heat it in a microwave then pour it back onto the spring pans that is better than nothing.

Last edited by v6coop; 2 Weeks Ago at 15:15.
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[QUOTE=Fast4gee;17516363]Food grade citric acid !?

Citric acid is found naturally in citrus fruits (cf. lemon juice) and is used in food production in many ways but perhaps along with pectin to make jam set is the most likley way to come across it at home (I'm trying to avoid the gender stereotypes here). WRT rust removal, its effect is nothing like as dramatic as 'stronger' acids such as concentrated hydrochloric or sulphuric (battery acid) but that is good, as you want the rust removing with as little effect as possible on the un-oxidised metal. Whilst it is not good to leave your hands in it for prolonged periods as it is an irritant, it won't cause instant burns and can be readily washed off hands and metal with water. It does stain marble though if you leave it long enough (don't ask!).
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