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Just so its clear, do not sand or bead blast or anything on coil springs. Most modern coil springs have 2-3 different shot peening processes done, with some of the residual hardness layers less than 0.5mm. You don't want to disturb that.
I would spray the coils down with AMSOIL HDMP Or similar wax like coating to seal the surface and keep it from getting worse. Or replace them. Honestly that looks pretty bad for a 2 year old spring; I assume they're using e-coat or just paint as those are the cheapest coatings commercially available for coil springs. Try to get coils with at least dual epoxy powder coating.
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