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I know very little about metal-to-metal corrosion, but I do know that steel cylinders (in the UK at least) are zinc coated prior to painting when they are intended for use in the sea. This may even be a requirement of the British Standard for dive cylinder testing, though I'm unsure of this. I use steel cylinders with Dive Rite stainless bands around them. When I fitted the bands I did so on half-empty tanks and placed some silver ducting tape inside the bands. I don't know if this is the reason, but I have seen no corrosion of any kind on my cylinders. This could just be because the tape stops the bands from scoring the paint and exposing the steel..?.. Just my tuppence worth! Ali. ******************************************************************************* Dr A.M.Lawrie, Dept. Human Anatomy and Cell Biology, University of Liverpool, Tel: (+44) 151 794 5510 Ashton Street, Fax: (+44) 151 794 5517 Liverpool, L69 3BX. email: aml@li*.ac*.uk* *******************************************************************************
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