Quote:
originally posted by bigben2k
You would have to anodize the interior of the aluminium tube. Also, you would have to make sure that all the joints do not leave any raw aluminium exposed to the water, because the accelerated corrosion would then be concentrated at those joints!
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Aye...I think this is the biggest mistake when people mix copper & alum. They make a nice pretty alum top with some pipe threads in it. You then screw a barb into the tapered thread, which by its very nature is going to want to scrape a bit of the anodizing away...leaving you with very high potential for problems. Another problem with anodizing threads is the process tends to build up material in the root of the thread. Typically on the parts I have seen anodized the threads are masked from the anodizing process becuase of this...it builds up enough material to make it so a bolt won't fit. The other problem with anodizing the interior of the square tubing is it would have to be done after all the welding was done, making it damn tough to actually inspect how good of coverage was done. I have not seen square copper tubing, but I would not be suprised if it was out there. I have seen square brass tubing tho...might be ideal for intergrating a resevior into the frame for a case. Probabally would cost a few $$$ tho.