Not tried it myself but I believe Coke is a good rust remover,does it contain oxalic acid in its recipe?

Location: Piddle Valley

Coke contains phosphoric acid. That's the main ingredient in a lot of rust treatments. Oxalic acid is often sold as wooden deck cleaner and can be found in hardware shops (Bunnings has it in Aus and NZ).

Simon

Location: Wellington

Re the possibility of removing some of the metal with an electrolysis bath, I used this method for years, utilising a household enamel bath. I found no evidence of damage to the metal. Cheers, Bill

Location: Euroa. Australia

As Roger mentioned there is lots on line. The site http://freechemistryonline.com/removal-of-rust-from-iron.html seems the most succinct. It claims no embrittlement with alkali....

I think I grasp electroplating but how the cathode comes to be selectively stripped of rust is not explained. Have we any chemists?

The dangers of embrittlement may be unknown to many. To be avoided with HT steel and particularly spring steel as road springs and spokes.
Chrome plating of such parts esp suspect; not only causes embrittlement but also proneness to fatigue, the latter not necessarily remedied by heating.

Location: Auckland, NZ