PDP-11/34 rails?

[Jon Elson]

On 03/04/2017 09:34 PM, Noel Chiappa via cctalk wrote:
> BTW, does anyone know that they grey coating is? Is it some sort of phosphate
> plating, or perhaps some sort of early powder coat, or what? Mine are rusty,
> and I'd like to blast them and get them re-coated, but I can't figure out
> what that coating is.
>
>
It's some kind of nitride, but I have no idea how it is applied.

Jon