On 23/08/18 12:25, unk wrote:
this car frame need some sections re-constructed due to rust, and enough
other work that everything comes off the frame is an actual frame, has
plastic body

has anyone ever galvanized a car frame - what prep is needed beside basic
oil/dirt/paint removal

it could be electrolytically de-rusted (tank made from large poly sheet
and wood frame on concrete floor), or will the galvanizing process handle
leftover surface rust?

only a few of these car frames made, buying another means basically
buying another car

Depending on the galvanising plant capability it doesn't need to be
de-rusted just degreased and paint removed. I have a couple of
galvanising plants in the region and the better one acid dips the part
which removes rust and mill scale, then dips in flux, salammoniac IIRC,
then the zinc bath. Extra galvanising can be applied by a heavy sand
blast prior to dipping. If the car frame is closed it may require
drilling to prevent pressure build-up due to the zinc bathÂ* heat and
allow the frame to drain, if an open C channel then likely no
venting/drain required. A mate had a Marcos chassis galvanised and it
went well but the guy that organised the job had taken someÂ* years to
get the venting and dipping perfected for consistent results with the
galvanisers.