Model Boat Mayhem - Forum

Technical, Techniques, Hints, and Tips => Engineering Techniques and Materials. => Topic started by: Jon on March 31, 2016, 08:17:43 PM

Title: Anodising shop for small jobs? UK
Post by: Jon on March 31, 2016, 08:17:43 PM
Hi, I know I can look into DIY anodising, and was going to, but I only need one part (Korts Nozzle) doing, and it would seem excessive to kit out just to do one part.
Is there a hobby orientated anodising place in the UK? Either local to the West Midlands, or mail order?

Or if anyone can suggest alternative solutions.
I've made a 2" korts Nozzle with shaft out of aluminium, it's obviously raw, so I would think it needs protecting before subjecting it to the water, and I was thinking that paint with etc primer may not be enough long term, but your comments would be appreciated.

(https://dl.dropboxusercontent.com/u/5915667/Model%20Photos/DSC04884.JPG)

Jon
Title: Re: Anodising shop for small jobs? UK
Post by: hollowhornbear on April 01, 2016, 08:18:03 AM
what grade ali is it? if it has silicone in its composition the anodising may be patchy.
Title: Re: Anodising shop for small jobs? UK
Post by: Subculture on April 01, 2016, 09:03:56 AM
Use a decent etching primer, and it'll be fine. Anodising is only worthwhile if you're leaving it unpainted.

Upol do a good etching primer, and you can purchase it in convenient aerosol form.

Alternatively you can make up a mixture of vinegar and salt, and dip the nozzle in until it turns matt grey. that puts millions of tiny pits into the aluminium, giving conventional primer lots to cling to.
Title: Re: Anodising shop for small jobs? UK
Post by: Jon on May 31, 2016, 07:32:49 PM
Sorry for the late reply to you, but thank you for your replies.
I went for the etch primer and a decent semi-gloss industrial paint, so hopefully I should be OK.
Rgds
Jon

(https://dl.dropboxusercontent.com/u/5915667/Model%20Photos/2016-05-29%2021.46.24.jpg)
Title: Re: Anodising shop for small jobs? UK
Post by: tigertiger on June 01, 2016, 08:28:33 AM
Personally, I think the look you now have is much better than anodized color.
Title: Re: Anodising shop for small jobs? UK
Post by: solidus on June 01, 2016, 04:43:24 PM
 Anodising is much better than enamel coating as a protection layer against corrosion because its grown out from an aluminium substrate. I made several pieces of anodised particles in a small scale with very satisfactory results. The substrate is best etched  with caustic soda at  50gram/ litre of water and keeping the etchant at 50 degree Celcius, before anodising. 50 seconds is sufficient for a thorough etch.
Someone rightly pointed earlier out that silicated aluminium e.g. cast aluminium , cannot be anodised evenly and the anodic layer , which is very powderly,cannot exceed 6 micron. This is not good for corrosion protection. With very primitive apparatus anodising can be done.