To be honest I have used Alodine for ages and never had any issues with ; you are talking about Acid ? Alodine never was eating any part of material I plunged into ? I bought Alodine in small plastic bottlle to mix to warm medium water and this was send by the supplier by post ? So am wondering really if it was so dangerous you are describing ( it's complety different than nitric acid for example !! yes this one is really dangerous )
I was using Alodine to make any aluminium part I built a sort of yellow gold color ( before painting) and just using glove not to have thingers yellow too !! and had some days some on hand but really never feel any attack ?
But you probably know more ; so it's better to follow your precautionous advise ..... I will do next time now for sure
Interesting you are speaking of Chromate bath ; is this one that makes parts black ? Will be very interested to know more about this ( Can a private people use it easily ?)
Last edited by LM mic; 18-10-2014 at 07:13.
Last edited by LM mic; 18-10-2014 at 07:11.
I'd contacted marvic about their uprights but at 2.5k a pair, they were a bit too much money. Similar items were available elsewhere and have been for a few years but I was advised against them due to issues with cracking of the castings. By the time you factor in the stratos bearing and hub, they get pricey so I've gone down the route of a more modern machined from billet version, similar geometry to the original stratos but with a 5 x 108 pcd cartridge style bearing kindly supplied by listerbell. Radial mount ap 6720 calipers, wheel speed sensors and a few other features. With some careful design, wheels from marvic, roin, listerbell and hawk can all fit under a group 4 arch.
Last edited by strat24v; 18-10-2014 at 10:51.
What diameter are the struts that fit in the marvic upright?
These are my wheels, refinished by Ian Jemison http://www.ianjemison.co.uk who repair and refinish magnesium wheels, but I didn't think to ask him to X-ray etc - anyway I'll use them but not 'in anger'. Those uprights look quite different to my Stradale ones (below) - they must be for competition are they?
[QUOTEtt=LM mic;22772]I recently sourced Magnesium set of wheel from Marvic ; they are ( Just to me!) more accurate than Ronin ones and done properly as original ones where done and just for
You to know ; they are also able to supply with reasonable price the original Stratos upright
[/QUOTE]
Any cracking in magnesium is usually easy to see visually due to the coarse grain structure, the same with cast alumimium. The dye checking method Michel mentioned is probably the easiest method for crack detection, but won't work if the material has been media blasted (depending on the type of media) as it moves material and can close over the cracks. Dye checking requires the item to be very clean an also paint stripped. It's easy to miss cracks when x-raying thicker material, but doesn't require paint stripping, it's time consuming and expensive. Eddy current inspection is my favourite, it's quick, easy, doesn't require paint stripping and is very sensitive, you can use different fequencies to look for cracking at different levels in the material, high freq for surface, low freq for sub surface. It requires a refence standard made of the same material as you're going to inspect with a sample crack to calibrate the machine but any NDT firm would have dosens of these. If you lived close I'd do the eddy current on them for you.
There will be NDT firms around that would do it for you if you're concerned, it's not usually cheap though. I'm lucky, I walk down to the end of our hangar and do it myself, I was in our NDT dept for three years and they still let me use the equipment. The thermal infrared is a cool toy to play with!
Alodine/Alochrome are brand names, the conversion coating is chromic acid, diluted of course, not too harmful on metal, not very friendly for your body. If you can get an alodine touch-n-prep pen use that, they're great, just apply and wait for it to dry, no need to flush the area.
Last edited by Fingers; 18-10-2014 at 21:39.
Paul.
Sat in a real one, may never wash again!
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