When I googled rad electrolysis I also found this on AAPD's site
ELECTROLYSIS PROTECTION RADIATOR CAP
C5ZZ-8100-RC-C
This radiator cap includes a magnesium anode that protects aluminum and other soft material engine components from electrolysis. Electrolic metal (EME) is slowly destroying your engine components. EME attacks timing chain covers, radiators, heater cores, intake manifolds, freeze plugs, head gaskets, thermostat housings even cylibder heads causing premature failures. By allowing EME to attack the sacrificial anode, the Rad Cap" protects your engine while driving or in storage. Fits all years, con
Application Notes: CHROME PLATED
Price: $25.95 each
http://www.aapd.net/CMPdetail.aspx?ID=2617&Gbase