Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
It is called "sacrificial anode":
<a href="http://en.wikipedia.org/wiki/Sacrificial_anode">http://en.wikipedia.org/wiki/Sacrificial_anode</a>
It uses the destructive effect of electrochemical corrosion to protect the steel.

The german article
<a href="http://de.wikipedia.org/wiki/Opferanode">http://de.wikipedia.org/wiki/Opferanode</a>
mentions a way to use cheap material if an electrical current is forced between the steel and the sacrified material. Zinc is more expensive than steel and electricity should not be a problem, so this variant may be used in offshore windpower. But I don't know for shure.

The picture with the tripod looks like the turbine at Hooksiel (a single near-shore installation for testing and exercising). In 2008 I was on vacation there and saw some preparations for the erection going on.
<a href="http://www.bard-offshore.de/en/projects/nearshore/hooksiel">http://www.bard-offshore.de/en/projects/nearshore/hooksiel</a>


by josch222 on Mon Jan 25th, 2010 at 03:53:16 AM EST
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