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Date:         Fri, 30 Apr 2004 10:37:44 -0400
Reply-To:     David Brodbeck <gull@GULL.US>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Brodbeck <gull@GULL.US>
Subject:      Re: for the record water is not corrosive
Comments: To: Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
In-Reply-To:  <f05100300bcb7ef9d729e@[203.167.171.251]>
Content-Type: TEXT/PLAIN; charset=US-ASCII

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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