[dave in australia]

Try more anode area. I try and keep my anode to cathode area ratio at as close to 1:1 as possible. Also, with that size surface area, I would suspect that a 12v battery charger would not be enough. I use a 12V 60Amp adjustable power supply for my electrolysis stripping tank, and use sheet metal for the anode to keep the surface area ratio up.