How to remove rust from EMF shield

[arroz]

Hi!

Restoration of an LC III is going great, board recapped is working perfectly! Now, the top shield is in a sad state (see photo). What's the best way to clean this? Assuming I separate the shield from the case, would a vinegar bath for a few hours work? What techniques do you use?

The video and SCSI ports are also quite rusty. What do you recommend for those?

Thanks,

Miguel Arroz

 

[finkmac]

evaporust will get the corrosion off, but will also strip the coating... meaning it'll oxidize again. a clear or zinc coat will prevent that.

 

[Phipli]

I use a wire brush on a Dremel or an angle grinder depending on how bad it is, then paint it with electrically conductive paint if you're behaving, or just zinc primer if you just want to preserve it.

 

[Phipli]

It doesn't look too bad to be honest. The main issue is that it is hard to do the other side without removing it, and removing it is generally a destructive process (they melt the plastic to hold it in place).

 

[Callan]

This process depends on how nice you want the restoration to be. Easy way is to just cut the melted tabs with.a razor blade, then you can use the above methods to remove the rust. Add a fine sandpaper to that list as another (once removed - hard to do while attached to the case). You can then just attache the shield back with a hot glue gun.
Another method to remove the shielding is to use hot air on the plastic tabs and pull up on the shielding as you heat the tabs. This will pop the shielding from the tab. If done right you can trim the plastic tabs so they will fit the shielding easily when your putting it back on. . You can then re-melt the tabs to secure the shielding. if you have access to a small sand blasting setup you can use that to strip the rust too.
When done, like everyone has pointed out, you'll need to paint, coat with a sealent, or even powderxoating works. It just depends on how nice a finished product you want. There are some good metallic paints out there that also make it look like the original.