by Oldbloke » 21 Apr 2016, 9:14 pm
See link below.
https://en.m.wikipedia.org/wiki/Galvanic_corrosionUS Navy Littoral Combat Ship Independence
Serious galvanic corrosion has been reported on the latest US Navy attack littoral combat vessel the USS Independencecaused by steel water jet propulsion systems attached to an aluminium hull. Without electrical isolation between the steel and aluminium, the aluminium hull acts as an anode to the stainless steel, resulting in aggressive galvanic corrosion.[8]
My bet is the cap is made of alluminium.
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