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>Now you've got me. I think aluminum is typically anodized, a process different >than painting, which may be the source of the original problem. A painted Al >tank may be a bad thing. >A steel tank, however, does well around Zinc. Zinc gives up it's first >electron more easily than steel, and so as long as there is zinc in electrical >contact with steel (or many other metals), the zinc will corrode before the >other metal. This is why they put (and replace) zincs on outboard motors, and >also why you sometimes see a nut or bolt badly rusted, surrounded by clean >metal. It's called a sacrificial anode, and so zinc primer is a good idea on a >steel tank. >Conspiracy theorists often wonder why they don't put zincs on car body parts. >Actually, conspiracy theorists KNOW why they don't put zincs on car body >parts, but that's for another group. >#----------------------------------------------------# > Roger Carlson H 310-376-4437 > Somewhere off Hermosa Beach, CA W 310-813-0858 Roger_Carlson@at*.sp*.tr*.co* F 310-812-1363 New and improved: http://darkside.sp.trw.com:21 #----------------------------------------------------# -- Send mail for the `techdiver' mailing list to `techdiver@opal.com'. Send subscription/archive requests to `techdiver-request@opal.com'. ******************************************************************* I have dove on oil rigs in Texas and they use the same sacrififial anode with a block of zinc on the cross members of the rig. Norm_Donkersloot@cc*.or*.mm*.co*
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