| Subject: | Re: for the record water is not corrosive |
| From: | David Brodbeck |
| Date: | Fri, 30 Apr 2004 10:37:44 -0400 |
On Sat, 1 May 2004, Andrew Grebneff wrote: > Cavitation produces, I think, vacuum "bubbles". The water surface can > then return at speed & hit the impeller, thereby eroding (not > corroding) it. This also pits boat props. If I remember right, cavitation bubbles are bubbles of water vapor. It happens when the local pressure drops so far that the water "boils" at room temperature. You're correct that the corrosion is caused by the mechanical impact when the bubbles suddenly collapse. David Brodbeck, N8SRE '86 Volvo 240DL wagon '82 VW Vanagon Westfalia Diesel
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