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>From: toddl@in*.co* (Todd Leonard) >Subject: metal touching metal > >A posting in another forum got me wondering about the effects >of metal components in contact with eachother in a diving rig. >The poster mentioned he uses a strip of inner-tube around the >circumference of his tanks, in-between the tank surface and the >hose-clamp he uses to attach D-rings. I've never noticed a >configuration like this (though I wasn't really looking), so >I'm curious about how big an issue contact between the hose >clamp and tank (or metal components in general) really is. Are >there problems caused by electric potential between dissimilar >metals? Abrasion problems? Is it dependant on the specific >metals involved? Or on salt vs. fresh water? How do others >deal with the issues (if any)? > I used to mount a pony bottle to my main tank using an aluminium bracket. The pony was attached to the bracket with stainless steel bands while the bracket was attached to the main tank by a BC strap. I always washed the pony after dives, but left it attached to the bracket. After about 6 months, I removed the bracket and found that where the stainless bands contacted the bracket, there was some noticable corrosion of the aluminium. There was no corrosion on the pony itself due to an intact paint coating. I would say that with aluminium tanks, it would be prudent to not leave stainless steel bands directly around them for long periods, particularly if the paint coating is damaged. These days, I tend to use the pony as a small stage bottle and attach D rings to it using the same bands. I use a strip of inner tube under the bands as insurance. In general with corrosion, the types of metals do matter and salt water will be worse than fresh. Regards, David. ______________________________________________________________________________ David Giddy, Voice: +61 3 9253 6388 Telstra Research Laboratories, Fax: +61 3 9253 6144 P.O. Box 249, Rosebank MDC, 3169, AUSTRALIA Email: d.giddy@tr*.te*.co*.au* ------------------------------------------------------------------------------
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