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7th November 2009, 07:34 AM #1GOLD MEMBER
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Aluminium on Steel corrosion problem?
I have a machined cast iron plate I am looking to use as a router table with a 50 x 6mm thick aluminium angle bar as a fence.
If this sits for some time in a humid tropical environment, will corrosion occur?
Is there any way I can avoid this by coating the aluminium bar with a hard wearing compound or something?
regards,
Jill
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7th November 2009 07:34 AM # ADSGoogle Adsense Advertisement
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7th November 2009, 08:11 AM #2GOLD MEMBER
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Jill, have a look here at the web site titled "Corrosion build up between Aluminum and Steel plates" . Here is the most relevant post:
This is a very common problem. I ran in to this in 1978 when working on aluminum runnning boards mounting to steel brackets and trailer hitches bolting to aluminum bumpers on cars and trucks. It is a galvanic process. The automotive industry uses stainless steel to mount aluminum trim to prevent the galvanic corrosion. Nickel plating the steel parts and using stainless steel mounting bolts and nuts should help prevent the galvanic action. However, be careful to use different grades of stainless in the bolts and nuts and plenty of lube. Identical Stainless steel grades can seize.
regards,
Dengy
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7th November 2009, 04:50 PM #3Pink 10EE owner
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Can you put plastic between the alum and steel??? that would stop it..
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15th November 2009, 09:53 AM #4Can you put plastic between the alum and steel??? that would stop it..]
You need to mechanically isolate the dissimilar metals to prevent corrosionInspiration exists, but it has to find you working. — Pablo Picasso
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15th November 2009, 11:03 AM #5GOLD MEMBER
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Thanks everyone. I was looking to used a large 80 x 80 mm aluminium angle section as a fence on a cast iron router table surface, but in the light of the above comments, I have decided to use a timber sliding base for my fence instead
regards,
Jill
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15th November 2009, 11:28 AM #6.
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15th November 2009, 02:11 PM #7GOLD MEMBER
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Sounds a good idea, BobL. Where do you get these 3mm sheets of high density polyethylene, and how do you cut them to shape?
How do you fix them to the base of the fence and the jigs?
regards,
Jill
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15th November 2009, 02:45 PM #8.
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Some hardware stores, or plastics suppliers have them. Problem with plastic suppliers is having to buy a whole 1.2 x 2.4 m sheet can costs several hundred $.
You can treat HDPE almost like wood. eg It cuts with a very nice finish with a table saw. If you have a triple chip or negative rake Circ Saw blade then that is the way to go, other wise do it slowly with as high a tooth count blade as you have. The other way is using a handsaw and then a hand plane!
How do you fix them to the base of the fence and the jigs?
I also routed a rolled over edge onto the edges of the HDPE to help it slide a little easier.
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15th November 2009, 03:23 PM #9GOLD MEMBER
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Very impressive!!
Thanks for the detailed replies to my questions and for the photos. Looks like 6mm is the way to go.
Can anyone please advise where I might get some 3mm or 6mm HDPE? I haven't ever seen it around.
regards,
Jill
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15th November 2009, 04:06 PM #10
Same stuff as they use for kitchen chopping boards I believe. Ive done in the odd board in my time when her indoor has her back turned.
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15th November 2009, 11:03 PM #11
Kitchen chopping boards are sometimes available at garage sales.
I've recycled some HDPE containers into thicker material by laminating and cooking in the oven. Details upon request.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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16th November 2009, 08:30 PM #12Senior Member
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I don't think it would be a huge problem in a covered dry area.
The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.
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